JP3689023B2 - Safety device for injection molding machine - Google Patents

Safety device for injection molding machine Download PDF

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Publication number
JP3689023B2
JP3689023B2 JP2001178586A JP2001178586A JP3689023B2 JP 3689023 B2 JP3689023 B2 JP 3689023B2 JP 2001178586 A JP2001178586 A JP 2001178586A JP 2001178586 A JP2001178586 A JP 2001178586A JP 3689023 B2 JP3689023 B2 JP 3689023B2
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Prior art keywords
safety device
cylinder
screw
injector
pressure
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JP2002361709A (en
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裕正 上園
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Japan Steel Works Ltd
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Japan Steel Works Ltd
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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
    • B29C45/76—Measuring, controlling or regulating
    • B29C45/77—Measuring, controlling or regulating of velocity or pressure of moulding material
    • 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
    • B29C45/84—Safety devices

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、射出成形機の安全装置に関し、詳しくはスクリュによる材料溶融後の途中段階で、該溶融材料に、シリンダに取り付けられているインジェクタにより超臨界流体が注入されるインラインスクリュ式射出成形機の安全装置に関するものである。
【０００２】
【従来の技術】
従来、この種の装置としては、図２に示すものがあった。
【０００３】
図２に示すように、射出装置は、シリンダ１と、このシリンダ１内に回転かつ前後動可能に設けられているスクリュ２と、このスクリュ２を駆動するスクリュ駆動装置３と、このスクリュ駆動装置３を制御するコントローラ１２とからなり、シリンダ１の外周部には、シリンダ１内の材料を加熱する加熱ヒータ５が取り付けられ、スクリュ２の先端には、射出時に溶融材料の逆流を防止する逆流防止装置６が取り付けられている。
【０００４】
上記射出装置のシリンダ１には、超臨界流体をシリンダ１内に注入するインジェクタ７がボルト８によって取り付けられ、このインジェクタ７には、超臨界流体発生装置９が接続されている。
【０００５】
次に動作について説明する。
【０００６】
シリンダ１に供給された材料の可塑化は、ユーザが設定した回転数、背圧力を基に、コントローラ１２からスクリュ駆動装置３に指令が出され、スクリュ２が回転することによって行われる。
【０００７】
材料の可塑化中、超臨界流体発生装置９にて設定された流量、圧力によってインジェクタ７から溶融材料内に超臨界流体が注入される。この注入された超臨界流体は、スクリュ２によって溶融材料と混練され金型内に射出される。
【０００８】
上記超臨界流体は、二酸化炭素（ＣＯ2）の状態図である図３に示すように、気体や液体をある圧力、ある温度以上にして得られる液体でも気体でもない状態にある流体のことである。密度は液体に近く、流動性は気体、つまり分子が密集し、かつ活発に運動している状態となる。この超臨界流体は溶剤的な性質を持っているので、食品分野では、抽出・分離用として利用されている。
【０００９】
射出成形分野では、この超臨界流体の性質を利用し、超臨界状態の二酸化炭素（ＣＯ2）や窒素（Ｎ2）を樹脂に混ぜ合わせることで、微細な発泡状態のプラスチックを作り、このプラスチックで射出成形品を成形している。本成形技術は、広い範囲の射出成形品に応用でき、製品の軽量化、成形品のコストの大幅な低減だけでなく、プラスチックの流動性の向上、型締力・射出圧力の低減、成形品のひけ、そりの改善等が実現できる画期的な技術として注目されている。
【００１０】
【発明が解決しようとする課題】
上記従来の装置では、可塑化中に逆流防止装置の不具合などでシリンダ内のインジェクタ付近に異常圧力が生じた場合でも、それを検出する手段はないので、インジェクタや、その取付用ボルトが破損したり、また破損には至らなくても、溶融材料の圧力が臨界流体の注入圧力を越え、インジェクタ内に溶融材料が逆流し作動不良を引き起こす恐れがある。
【００１１】
本発明は、上記問題点を解決するためになされたものであって、超臨界流体をシリンダ内に注入するインジェクタの安全性を向上させ、かつインジェクタの破損を未然に防ぐことを目的とする。
【００１２】
【課題を解決するための手段】
本発明の射出成形機の安全装置は、スクリュによる材料溶融後の途中段階で、該溶融材料に、シリンダに取り付けられているインジェクタにより超臨界流体が注入される射出成形機の安全装置において、スクリュの回転軸を法線とするインジェクタを含むシリンダの断面と同一断面内に、異常圧力発生時に破裂してシリンダ内の圧力を開放する機械的安全装置としての破裂板と、電気的安全装置としての圧力センサとが設置されており、該圧力センサに、異常圧力発生時にスクリュ駆動装置へ停止指令をだすコントローラが接続されていることを特徴とする。以上のように、本発明の射出成形機の安全装置は、電気的安全装置としての圧力センサと機械的安全装置としての破裂板との２重安全システムが構成されたものである。
【００１４】
【発明の実施の形態】
本発明の実施の形態を実施例に基づき図面を参照して説明する。
【００１５】
図１に示すように、射出装置は、シリンダ１と、このシリンダ１内に回転かつ前後動可能に設けられているスクリュ２と、このスクリュ２を駆動するスクリュ駆動装置３と、このスクリュ駆動装置３を制御するコントローラ４とからなり、シリンダ１の外周部には、シリンダ１内の材料を加熱する加熱ヒータ５が取り付けられ、スクリュ２の先端には、射出時に溶融材料の逆流を防止する逆流防止装置６が取り付けられている。
【００１６】
上記射出装置のシリンダ１には、超臨界流体をシリンダ１内に注入するインジェクタ７がボルト８によって取り付けられ、このインジェクタ７に超臨界流体発生装置９が接続され、インジェクタ７に超臨界流体を供給している。
【００１７】
前記インジェクタ７付近には、圧力センサ１０と破裂板１１が設置されている。圧力センサ１０には、異常圧力発生時にスクリュ駆動装置３へ停止指令をだすコントローラ４が接続されている。
【００１８】
圧力センサ１０とコントローラ４は、溶融材料の圧力を常時監視し、電気的安全装置としての機能を果すものであり、また、破裂板１１も機械的安全装置としての機能を果たすものである。
【００１９】
このように、本装置では、仮に異常圧力が発生しても装置破損などに至らぬように、機械・電気の２重安全システムが構築されている。
【００２０】
なお、超臨界流体の注入圧力を設定するために圧力センサ１０をインジェクタ７近傍に設置している場合は、新規に圧力センサを設置しなくても、そのセンサ１０の信号を前記コントローラ４に取り込み、電気的安全装置として機能させてもよい。
【００２１】
また、コントローラ４がスクリュ駆動装置３へ停止指令を出すときの制限圧力は、破裂板１１が破裂する圧力よりも低く設定し、むやみに破裂板１１が破裂しないようにしてある。
【００２２】
次に動作について説明する。
【００２３】
シリンダ１に供給された材料の可塑化は、ユーザが設定した回転数、背圧力を基に、コントローラ４からスクリュ駆動装置３に指令が出され、スクリュ２が回転することによって行われる。
【００２４】
材料の可塑化中、超臨界流体発生装置９にて設定された流量、圧力によってインジェクタ７から溶融材料内に超臨界流体が注入される。この注入された超臨界流体は、スクリュ２によって溶融材料と混練され金型内に射出される。
【００２５】
圧力センサ１０は、その出力信号をコントローラ４に取り込み、シリンダ１内の圧力を常時監視している。
【００２６】
仮に異常圧力が発生した場合は、コントローラ４よりスクリュ駆動装置３に停止信号を出し、サイクルを中止させる。また、圧力センサ１０の不具合等で作動しない場合でも、機械的安全装置としての破裂板１１が破裂して圧力を開放し、インジェクタ７や、その取付用ボルト８の破損やインジェクタ７内に溶融材料が逆流するのを未然に防ぐことができる。
【００２７】
【発明の効果】
本発明は、以上説明したように構成されているので、超臨界流体をシリンダ内に注入するインジェクタの安全性を向上させ、かつインジェクタの破損を未然に防ぐことができる。
【図面の簡単な説明】
【図１】本発明の一実施例の射出成形機の安全装置の構成図である。
【図２】従来の射出成形機の安全装置の構成図である。
【図３】二酸化炭素（ＣＯ2）の状態図である。
【符号の説明】
１ シリンダ
２ スクリュ
３ スクリュ駆動装置
４、１２ コントローラ
５ 加熱ヒータ
６ 逆流防止装置
７ インジェクタ
８ ボルト
９ 超臨界流体発生装置
１０ 圧力センサ（電気的安全装置）
１１ 破裂板（機械的安全装置）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety device for an injection molding machine, and more specifically, an inline screw type injection molding machine in which a supercritical fluid is injected into the molten material by an injector attached to a cylinder at an intermediate stage after the material is melted by a screw. This relates to the safety device.
[0002]
[Prior art]
Conventionally, this type of apparatus is shown in FIG.
[0003]
As shown in FIG. 2, the injection apparatus includes a cylinder 1, a screw 2 provided in the cylinder 1 so as to be rotatable and movable back and forth, a screw drive device 3 that drives the screw 2, and the screw drive device. The heater 12 for heating the material in the cylinder 1 is attached to the outer peripheral portion of the cylinder 1, and the back flow for preventing the backflow of the molten material at the time of injection is provided at the tip of the screw 2. A prevention device 6 is attached.
[0004]
An injector 7 for injecting a supercritical fluid into the cylinder 1 is attached to the cylinder 1 of the injection device by a bolt 8, and a supercritical fluid generator 9 is connected to the injector 7.
[0005]
Next, the operation will be described.
[0006]
Plasticization of the material supplied to the cylinder 1 is performed when a command is issued from the controller 12 to the screw driving device 3 based on the rotation speed and back pressure set by the user, and the screw 2 rotates.
[0007]
During the plasticization of the material, the supercritical fluid is injected into the molten material from the injector 7 at a flow rate and pressure set by the supercritical fluid generator 9. The injected supercritical fluid is kneaded with the molten material by the screw 2 and injected into the mold.
[0008]
The supercritical fluid is a fluid in a state that is neither a liquid nor a gas obtained by bringing a gas or liquid to a certain pressure and a certain temperature or more as shown in FIG. 3 which is a carbon dioxide (CO 2 ) phase diagram. is there. The density is close to a liquid, and the fluidity is a gas, that is, a molecule is densely packed and actively moving. Since this supercritical fluid has solvent properties, it is used for extraction and separation in the food field.
[0009]
In the field of injection molding, using the properties of this supercritical fluid, carbon dioxide (CO 2 ) and nitrogen (N 2 ) in the supercritical state are mixed with the resin to make a fine foamed plastic. With injection molding products. This molding technology can be applied to a wide range of injection-molded products, not only reducing the weight of the product and significantly reducing the cost of the molded product, but also improving the fluidity of the plastic, reducing the clamping force and injection pressure, It is attracting attention as an epoch-making technology that can improve sinking and warping.
[0010]
[Problems to be solved by the invention]
In the above conventional device, even if abnormal pressure occurs near the injector in the cylinder due to a malfunction of the backflow prevention device during plasticization, there is no means to detect it, so the injector and its mounting bolt are damaged. Even if no damage occurs, the pressure of the molten material may exceed the injection pressure of the critical fluid, and the molten material may flow back into the injector and cause malfunction.
[0011]
The present invention has been made to solve the above-described problems, and it is an object of the present invention to improve the safety of an injector that injects a supercritical fluid into a cylinder and to prevent the injector from being damaged.
[0012]
[Means for Solving the Problems]
The safety device for an injection molding machine according to the present invention is a safety device for an injection molding machine in which a supercritical fluid is injected into the molten material by an injector attached to a cylinder at an intermediate stage after the material is melted by the screw. A rupture disc as a mechanical safety device that ruptures when an abnormal pressure occurs and releases the pressure in the cylinder in the same cross section as the cylinder including the injector whose normal is the rotation axis of A pressure sensor is installed, and a controller for issuing a stop command to the screw drive device when an abnormal pressure occurs is connected to the pressure sensor. As described above, the safety device for an injection molding machine according to the present invention comprises a double safety system including a pressure sensor as an electrical safety device and a rupturable plate as a mechanical safety device.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described based on examples with reference to the drawings.
[0015]
As shown in FIG. 1, the injection device includes a cylinder 1, a screw 2 provided in the cylinder 1 so as to be rotatable and movable back and forth, a screw drive device 3 that drives the screw 2, and the screw drive device. The heater 4 for heating the material in the cylinder 1 is attached to the outer peripheral portion of the cylinder 1, and the back flow for preventing the back flow of the molten material at the time of injection is attached to the tip of the screw 2. A prevention device 6 is attached.
[0016]
An injector 7 for injecting a supercritical fluid into the cylinder 1 is attached to the cylinder 1 of the injection device by a bolt 8. A supercritical fluid generator 9 is connected to the injector 7, and the supercritical fluid is supplied to the injector 7. doing.
[0017]
In the vicinity of the injector 7, a pressure sensor 10 and a rupturable plate 11 are installed. The pressure sensor 10 is connected to a controller 4 that issues a stop command to the screw drive device 3 when an abnormal pressure occurs.
[0018]
The pressure sensor 10 and the controller 4 constantly monitor the pressure of the molten material and perform a function as an electrical safety device, and the rupturable plate 11 also functions as a mechanical safety device.
[0019]
As described above, in this apparatus, a double mechanical / electrical safety system is constructed so that the apparatus will not be damaged even if an abnormal pressure occurs.
[0020]
If the pressure sensor 10 is installed in the vicinity of the injector 7 in order to set the injection pressure of the supercritical fluid, the signal of the sensor 10 is taken into the controller 4 without installing a new pressure sensor. It may function as an electrical safety device.
[0021]
Further, the limiting pressure when the controller 4 issues a stop command to the screw drive device 3 is set lower than the pressure at which the rupturable plate 11 bursts, so that the rupturable plate 11 does not burst unnecessarily.
[0022]
Next, the operation will be described.
[0023]
Plasticization of the material supplied to the cylinder 1 is performed when a command is issued from the controller 4 to the screw driving device 3 based on the rotation speed and back pressure set by the user, and the screw 2 rotates.
[0024]
During the plasticization of the material, the supercritical fluid is injected into the molten material from the injector 7 at a flow rate and pressure set by the supercritical fluid generator 9. The injected supercritical fluid is kneaded with the molten material by the screw 2 and injected into the mold.
[0025]
The pressure sensor 10 takes the output signal into the controller 4 and constantly monitors the pressure in the cylinder 1.
[0026]
If an abnormal pressure occurs, the controller 4 issues a stop signal to the screw drive device 3 to stop the cycle. Further, even when the pressure sensor 10 does not operate due to a malfunction or the like, the rupture plate 11 as a mechanical safety device ruptures and releases the pressure. Can be prevented from flowing back.
[0027]
【The invention's effect】
Since the present invention is configured as described above, it is possible to improve the safety of the injector that injects the supercritical fluid into the cylinder and to prevent the injector from being damaged.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a safety device for an injection molding machine according to an embodiment of the present invention.
FIG. 2 is a configuration diagram of a safety device of a conventional injection molding machine.
FIG. 3 is a phase diagram of carbon dioxide (CO 2 ).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Cylinder 2 Screw 3 Screw drive device 4,12 Controller 5 Heater 6 Backflow prevention device 7 Injector 8 Bolt 9 Supercritical fluid generator 10 Pressure sensor (electrical safety device)
11 Rupture disc (mechanical safety device)

Claims (1)

スクリュ（２）による材料溶融後の途中段階で、該溶融材料に、シリンダ（１）に取り付けられているインジェクタ（７）により超臨界流体が注入される射出成形機の安全装置において、
前記スクリュ（２）の回転軸を法線とする前記インジェクタ（７）を含む前記シリンダ（１）の断面と同一断面内に、異常圧力発生時に破裂して前記シリンダ（１）内の圧力を開放する機械的安全装置としての破裂板（１１）と、電気的安全装置としての圧力センサ（１０）とが設置されており、該圧力センサ（１０）に、異常圧力発生時にスクリュ駆動装置（３）へ停止指令をだすコントローラ（４）が接続されていることを特徴とする射出成形機の安全装置。In the safety device of an injection molding machine in which a supercritical fluid is injected into the molten material by an injector (7) attached to the cylinder (1) at an intermediate stage after the material is melted by the screw (2).
In the same cross section as the cylinder (1) including the injector (7) with the rotation axis of the screw (2) as a normal line, the pressure in the cylinder (1) is released by rupture when an abnormal pressure occurs. A rupture disc (11) as a mechanical safety device and a pressure sensor (10) as an electrical safety device are installed, and a screw drive device (3) is provided to the pressure sensor (10) when an abnormal pressure occurs. A safety device for an injection molding machine, characterized in that a controller (4) for issuing a stop command is connected.
JP2001178586A 2001-06-13 2001-06-13 Safety device for injection molding machine Expired - Lifetime JP3689023B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001178586A JP3689023B2 (en) 2001-06-13 2001-06-13 Safety device for injection molding machine

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JP3689023B2 true JP3689023B2 (en) 2005-08-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180017514A (en) * 2016-08-09 2018-02-21 엘에스엠트론 주식회사 Injection Molding Apparatus

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7204149B1 (en) * 2005-12-07 2007-04-17 D-M-E Company Apparatus for indicating pressure
TW202027942A (en) * 2019-01-16 2020-08-01 中原大學 Injection molding apparatus and injection molding method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180017514A (en) * 2016-08-09 2018-02-21 엘에스엠트론 주식회사 Injection Molding Apparatus
KR102429140B1 (en) * 2016-08-09 2022-08-03 엘에스엠트론 주식회사 Injection Molding Apparatus

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