JP3584426B2 - Inert gas feeding method for injection molding machine - Google Patents

Inert gas feeding method for injection molding machine Download PDF

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Publication number
JP3584426B2
JP3584426B2 JP29299797A JP29299797A JP3584426B2 JP 3584426 B2 JP3584426 B2 JP 3584426B2 JP 29299797 A JP29299797 A JP 29299797A JP 29299797 A JP29299797 A JP 29299797A JP 3584426 B2 JP3584426 B2 JP 3584426B2
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Prior art keywords
resin material
hopper
inert gas
loader
supply
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JPH11123743A (en
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和弘 池田
良衛 藤田
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Niigata Machine Techno Co Ltd
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Niigata Machine Techno Co 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
    • B29C45/18—Feeding the material into the injection moulding apparatus, i.e. feeding the non-plastified material into the injection unit
    • B29C2045/1891—Means for detecting presence or level of raw material inside feeding ducts, e.g. level sensors inside hoppers

Description

【０００１】
【発明の属する技術分野】
本発明は、射出成形機の樹脂材料供給係に窒素ガス等の不活性ガスを送入する方法に関する。
【０００２】
【従来の技術】
射出成形機において、スクリュが挿入された加熱筒に樹脂材料を供給ホッパからそのまま空気と一緒に供給すると、樹脂材料が酸化して焼けなどの成形不良を生じやすい。
そこで、従来においては、加熱筒の根元部や供給ホッパの下部に窒素ガスを供給源から送入管を通じて送入するようにしている（実公平５−２０５１１号公報、特開平１−１５４７１３号公報）。
【０００３】
ところで、プラスチック成形においては、近年、加熱筒の供給ホッパに乾燥ホッパと材料タンクを直列に接続し、樹脂材料を材料タンクから乾燥ホッパに移送して乾燥空気で湿気を取り、またその乾燥樹脂材料を供給ホッパに移送する一連の作動を自動化することが行われている。
【０００４】
【発明が解決しようとする課題】
上記従来の射出成形機は、樹脂材料の移送を真空或いは空気圧で行う方式となっていて、材料タンクと乾燥ホッパに酸化防止対策が全く講じられておらず、樹脂材料が常に空気中にあるため、材料タンクから乾燥ホッパを通って供給ホッパに入れられるまでに酸化が進んで成形不良の原因となる。
【０００５】
本発明は、樹脂材料の酸化を最低限度に抑えることができる射出成形機の不活性ガス送入方法を提供することを目的とする。
本発明の他の目的は、樹脂材料の真空移送に支障をきたさない射出成形機の不活性ガス送入方法を提供することである。
【０００９】
【課題を解決するための手段】
上記の少なくとも１つの目的を達成するために、請求項１記載の発明は、樹脂材料を乾燥させる乾燥ホッパに、樹脂材料を加熱筒に供給する供給ホッパが、ローダの作動により樹脂材料を上記乾燥ホッパから供給ホッパに真空移送する移送管で接続され、上記供給ホッパを不活性ガスの供給源に接続した送入管に電磁弁が設けられた射出成形機の不活性ガス送入装置において、上記ローダによる樹脂材料の真空移送時に上記電磁弁を閉じ、ローダの停止時に電磁弁を開いて不活性ガスを供給ホッパに送入する構成とした。
【００１０】
また、請求項２記載の発明は、材料タンクに、樹脂材料を乾燥して加熱筒の供給ホッパに投入する乾燥ホッパが、ローダの作動により樹脂材料を上記材料タンクから乾燥ホッパに真空移送する移送管で接続され、上記乾燥ホッパを不活性ガスの供給源に接続した送入管に電磁弁が設けられた射出成形機の不活性ガス送入装置において、上記ローダによる樹脂材料の真空移送時に上記電磁弁を閉じ、ローダの停止時に電磁弁を開いて不活性ガスを乾燥ホッパに送入する構成とした。
【００１１】
上記二つの手段では、樹脂材料の真空移送時に、不活性ガスの送入を中断するため、送入不活性ガスの吸込みによって真空移送に支障を生じることがなく、樹脂材料を円滑に移送することができる。
【００１２】
上記の不活性ガス送入方法において、ローダの移送作動と電磁弁の閉作動を、ホッパ内の樹脂材料が所定量に減少した場合に信号を出力するレベルセンサの出力信号によって行う構成とすることが好ましい（請求項３）。この構成では、ローダの移送作動と電磁弁の閉作動とを最適に同期させることができる。
【００１３】
【発明の実施の形態】
発明の実施の形態を図面を参照して説明する。
添付図面は本発明に係る方法を実施する射出成形機の不活性ガス送入装置の一例を示すもので、符号１は加熱筒である。加熱筒１内には、スクリュ２が回転自在にかつ前後（図１で左右）に進退自在に挿入されており、回転駆動装置（図示せず）でスクリュを回転させながら後退させることにより、供給ホッパ３から供給された樹脂材料を混練、溶融させてスクリュ２とノズル４の間に計量した後、射出駆動装置（図示せず）でスクリュ２を前進させて上記の計量樹脂をノズル４から金型の成形キャビティに射出するようになっている。
【００１４】
供給ホッパ３には乾燥ホッパ６が移送管７で接続されており、乾燥ホッパ６内の樹脂材料をローダ（移送装置）８の作動で移送管７を通して供給ホッパ３に移送することができる。乾燥ホッパ６には、循環用ブロア１０とヒータ１１とを有する送り管１２と、戻り管１３とによって除湿器１４が接続されており、循環用ブロア１０で気体を送り管１２と戻り管１３を通じて乾燥ホッパ６に循環させながら、その循環気体を除湿器１４で除湿し、またヒータ１１で加熱して乾燥ホッパ６内の樹脂材料を乾燥することができるようにされている。
【００１５】
また、乾燥ホッパ６には材料タンク１６が移送管１７で接続されており、材料タンク１６内の樹脂材料をローダ（移送装置）１８の作動で移送管１７を通じて乾燥ホッパ６に移送することができる。送り管１２には送気ブロア２０を有する送気管２１が接続されている。
【００１６】
供給ホッパ３の下部には、送入管２５の一端が直接接続され、乾燥ホッパ６には、送入管２６の一端が送気管２１と送り管１２を介して間接的に接続されるとともに、材料タンク１６には、送入管２７の一端が直接接続されている。そして、各送入管２５、２６、２７の他端は、窒素ガス供給源２８の主管２９にそれぞれ接続されている。各送入管２５、２６、２７には、流量調節弁３１、３２、３３と電磁弁３４、３５、３６がそれぞれ設けられている。
【００１７】
供給ホッパ３と乾燥ホッパ６とは、レベルセンサ３８、３９をそれぞれ有する。各レベルセンサ３８、３９は、各ホッパ３、６内の樹脂材料が所定量に減少した場合に信号を出力するものであり、レベルセンサ３８の出力信号によってローダ８が移送作動（吸引作動）するとともに、これに同期して電磁弁３４が閉じ、また、レベルセンサ３９の出力信号によってローダ１８が移送作動するとともに、これに同期して電磁弁３５が閉じ、タイマ（図示せず）に設定された時間が経過すると、ローダ８、１８が停止し、これに同期して電磁弁３４、３５が開くようにされている。
【００１８】
窒素ガスの供給源２８は、供給圧縮空気をエアフィルタ４１とミストフィルタ４２及びレギュレータ４３を通して分離器４４に送り、分離器４４で酸素ガスを除いて得られた窒素ガスを流量制御弁４５を介して主管２９に送り出す構造となっている。符号４７、４８は圧力計、４９は流量計である。
【００１９】
次に、上記の構成とされた射出成形機の不活性ガス送入装置の作用を説明する。
供給ホッパ３と乾燥ホッパ６に樹脂材料が所定量より多く入っている状態では、電磁弁３４、３５が開かれ、窒素ガスが供給源２８から供給ホッパ３と乾燥ホッパ６に送り込まれて供給ホッパ３と乾燥ホッパ６等の隙間から空気を外部に強制的に漏出させ、それらと移送管７に充満されているため、供給ホッパ３と乾燥ホッパ６及び移送管７内の樹脂材料の酸化が防止される。また電磁弁３６は常時開かれ、上記同様に窒素ガスが材料タンク１６に送り込まれて材料タンク１６等の隙間から空気を追い出して材料タンク１６と移送管１７に充満されているので、材料タンク１６と移送管１７内の樹脂材料も酸化を防止される。なお、空気の排除、換言すれば窒素ガスの送込みを可能にする上記の隙間は、供給ホッパ３や乾燥ホッパ６等の製作時、或いは組立時に必然的或いは計画的に形成されたものである。
【００２０】
上記で送入管２６から送気管２１と送り管１２を通って乾燥ホッパ６に送入される窒素ガスは、除湿器１４で除湿されてからヒータ１１で加熱されて乾燥ホッパ６に入り、乾燥ホッパ６内の樹脂材料を乾燥させる。
【００２１】
供給ホッパ３の樹脂材料が所定量に減少してレベルセンサ３８から信号が出力されると、電磁弁３４が閉じるとともに、ローダ８が作動して乾燥ホッパ６内の樹脂材料を供給ホッパ３に移送する。この状態はタイマに設定された時間継続し、設定時間が経過すると、再び電磁弁３４が開き、ローダ８が停止する。
【００２２】
また、乾燥ホッパ６の樹脂材料が所定量に減少してレベルセンサ３９から信号が出力されると、電磁弁３５が閉じるとともに、ローダ１８が作動して材料タンク１６内の樹脂材料を乾燥ホッパ６に移送する。この状態はタイマの設定時間継続し、設定時間が経過すると、再び、電磁弁３５が開き、ローダ１８が停止する。
【００２３】
上記において、ローダ８、１８の吸引作動中、電磁弁３４、３５が閉じられていて、ホッパ３、６に対する窒素ガスの送入を断っているため、窒素ガスの無駄な使用が防止される上、樹脂材料が支障なく円滑に真空移送される。
【００２４】
供給源２８からの窒素ガスの送出量は流量制限弁４５で調整し、供給ホッパ３と乾燥ホッパ６及びで材料タンク１６に対する窒素ガスの送入量は流量調節弁３１、３２、３３によって調節する。
【００２５】
本発明において、不活性ガス供給源２８は図２のものに限られるものではなく、他の構造とすることができる。除湿器１４には、除湿効率を高めるために、通常冷却器が設けられる。送気ブロア２０を省くことができる。また、供給ホッパ３と乾燥ホッパ６に、樹脂材料が所定量に達すると信号を出力してローダ８、１８を停止させるとともに、電磁弁３４、３５を開かせるレベルセンサをタイマに代えて設けてもよい。また、樹脂材料を真空移送するローダ８、１８に代えて、圧力気体で樹脂材料を移送する移送装置を用いることもできる。この場合は、圧力気体に不活性ガスを使用する構成とされる。図の送入管２５は供給ホッパ３の下部に接続されているが、窒素ガスが供給ホッパ３に流入するように加熱筒１に接続してもよい。
【００２９】
【発明の効果】
以上説明したように、請求項１記載の発明は、樹脂材料を乾燥させる乾燥ホッパに、樹脂材料を加熱筒に供給する供給ホッパが、ローダの作動により樹脂材料を上記乾燥ホッパから供給ホッパに真空移送する移送管で接続され、上記供給ホッパを不活性ガスの供給源に接続した送入管に電磁弁が設けられた射出成形機の不活性ガス送入装置において、上記ローダによる樹脂材料の真空移送時に上記電磁弁を閉じ、ローダの停止時に電磁弁を開いて不活性ガスを供給ホッパに送入する構成とされ、請求項２記載の発明は、材料タンクに、樹脂材料を乾燥して加熱筒の供給ホッパに投入する乾燥ホッパが、ローダの作動により樹脂材料を上記材料タンクから乾燥ホッパに真空移送する移送管で接続され、上記乾燥ホッパを不活性ガスの供給源に接続した送入管に電磁弁が設けられた射出成形機の不活性ガス送入装置において、上記ローダによる樹脂材料の真空移送時に上記電磁弁を閉じ、ローダの停止時に電磁弁を開いて不活性ガスを乾燥ホッパに送入する構成とされているので、不活性ガスガ無駄に浪費することなく、樹脂材料を円滑に移送することができる。
【００３０】
この場合、ローダの移送作動と電磁弁の閉作動を、ホッパ内の樹脂材料が所定量に減少した場合に信号を出力するレベルセンサの出力信号によって行う構成とすると、ローダの移送作動と電磁弁の閉作動を精度よく同期させることができる。
【図面の簡単な説明】
【図１】本発明に係る方法を実施する射出成形機の不活性ガス送入装置の一例を示す図である。
【図２】不活性ガス供給源の一例を示す図である。
【符号の説明】
１ 加熱筒 ３ 供給ホッパ
６ 乾燥ホッパ ７、１７ 移送管
８、１８ ローダ（移送装置） １２ 送り管
１６ 材料タンク ２５、２６、２７ 送入管
２８ 供給源 ３１、３２、３３ 流量調節弁
３４、３５、３６ 電磁弁 ３８、３９ レベルセンサ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to how you fed inert gas such as nitrogen gas into the resin material supplying engagement of the injection molding machine.
[0002]
[Prior art]
In an injection molding machine, if a resin material is directly supplied from a supply hopper together with air to a heating cylinder in which a screw is inserted, the resin material is oxidized, and molding defects such as burning easily occur.
Therefore, conventionally, nitrogen gas is supplied from a supply source to a base portion of a heating cylinder or a lower portion of a supply hopper through a supply pipe (Japanese Utility Model Publication No. 5-205511, Japanese Patent Application Laid-Open No. 1-154713). ).
[0003]
By the way, in plastic molding, in recent years, a drying hopper and a material tank are connected in series to a supply hopper of a heating cylinder, a resin material is transferred from the material tank to the drying hopper, and moisture is removed by dry air. Has been automated to transfer a series of operations to a supply hopper.
[0004]
[Problems to be solved by the invention]
The above-mentioned conventional injection molding machine has a system in which the resin material is transferred by vacuum or air pressure, and no measures are taken to prevent oxidation in the material tank and the drying hopper, and the resin material is always in the air. Oxidation proceeds from the material tank through the drying hopper to the supply hopper, which causes molding failure.
[0005]
The present invention aims at providing a Irigata method feeding inert gas injection molding machine can be suppressed to a minimum oxidation of the resin material.
Another object of the present invention is to provide a Irigata method feeding inert gas injection molding machine which does not disturb the vacuum transfer of the resin material.
[0009]
[Means for Solving the Problems]
In order to achieve the above at least one object, a first aspect of the present invention, the drying hopper for drying the resin material, feed hopper for supplying the resin material in the heating cylinder is, a resin material The drying by the operation of the loader In an inert gas feeder of an injection molding machine, which is connected by a transfer pipe for vacuum transfer from a hopper to a supply hopper, and a solenoid valve is provided in a feed pipe connecting the supply hopper to a supply source of an inert gas, When the loader transfers the resin material by vacuum, the electromagnetic valve is closed, and when the loader is stopped, the electromagnetic valve is opened to feed the inert gas into the supply hopper.
[0010]
According to a second aspect of the present invention, the drying hopper that dries the resin material into the material tank and puts the resin material into the supply hopper of the heating cylinder transfers the resin material from the material tank to the drying hopper by operating the loader. In an inert gas feeding device of an injection molding machine, which is connected by a pipe and has a solenoid valve provided in a feeding pipe in which the drying hopper is connected to a source of an inert gas, the above-mentioned loader is used to transfer the resin material by vacuum. The electromagnetic valve was closed, and when the loader was stopped, the electromagnetic valve was opened to feed the inert gas to the drying hopper.
[0011]
In the above two means, during the vacuum transfer of the resin material, the supply of the inert gas is interrupted, so that the suction of the supplied inert gas does not hinder the vacuum transfer and the resin material can be transferred smoothly. Can be.
[0012]
In the above inert gas supply method, the transfer operation of the loader and the closing operation of the electromagnetic valve are performed by an output signal of a level sensor that outputs a signal when the resin material in the hopper decreases to a predetermined amount. Is preferable (claim 3 ). With this configuration, the transfer operation of the loader and the closing operation of the solenoid valve can be optimally synchronized.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
The accompanying drawings show an example of an inert gas feeding device of an injection molding machine for performing a method according to the present invention, and reference numeral 1 denotes a heating cylinder. A screw 2 is rotatably and forwardly and backwardly (left and right in FIG. 1) inserted into the heating cylinder 1 so as to be able to advance and retreat. After kneading and melting the resin material supplied from the hopper 3 and measuring it between the screw 2 and the nozzle 4, the screw 2 is advanced by an injection driving device (not shown), and the above-mentioned resin is metered from the nozzle 4 into the metal. It is designed to be injected into the molding cavity of the mold.
[0014]
A drying hopper 6 is connected to the supply hopper 3 by a transfer pipe 7, and the resin material in the drying hopper 6 can be transferred to the supply hopper 3 through the transfer pipe 7 by the operation of the loader (transfer device) 8. A dehumidifier 14 is connected to the drying hopper 6 by a feed pipe 12 having a circulation blower 10 and a heater 11, and a return pipe 13. The circulation blower 10 sends gas through the feed pipe 12 and the return pipe 13. While circulating through the drying hopper 6, the circulating gas is dehumidified by the dehumidifier 14 and heated by the heater 11 so that the resin material in the drying hopper 6 can be dried.
[0015]
Further, a material tank 16 is connected to the drying hopper 6 by a transfer pipe 17, and the resin material in the material tank 16 can be transferred to the drying hopper 6 through the transfer pipe 17 by the operation of the loader (transfer device) 18. . An air supply pipe 21 having an air supply blower 20 is connected to the feed pipe 12.
[0016]
One end of an inlet pipe 25 is directly connected to the lower part of the supply hopper 3, and one end of an inlet pipe 26 is indirectly connected to the drying hopper 6 via the air pipe 21 and the feed pipe 12. One end of a feed pipe 27 is directly connected to the material tank 16. The other ends of the inlet pipes 25, 26, 27 are connected to a main pipe 29 of a nitrogen gas supply source 28, respectively. Each of the inlet pipes 25, 26, 27 is provided with a flow control valve 31, 32, 33 and a solenoid valve 34, 35, 36, respectively.
[0017]
The supply hopper 3 and the drying hopper 6 have level sensors 38 and 39, respectively. Each of the level sensors 38 and 39 outputs a signal when the resin material in each of the hoppers 3 and 6 decreases to a predetermined amount. The output signal of the level sensor 38 causes the loader 8 to perform a transfer operation (suction operation). At the same time, the electromagnetic valve 34 is closed in synchronization with this, and the loader 18 is moved by the output signal of the level sensor 39, and the electromagnetic valve 35 is closed in synchronization with this, and a timer (not shown) is set. When the elapsed time has elapsed, the loaders 8 and 18 are stopped, and the electromagnetic valves 34 and 35 are opened in synchronization with this.
[0018]
The nitrogen gas supply source 28 sends the supply compressed air to the separator 44 through the air filter 41, the mist filter 42, and the regulator 43, and passes the nitrogen gas obtained by removing the oxygen gas in the separator 44 through the flow control valve 45. The main pipe 29. Reference numerals 47 and 48 are pressure gauges, and 49 is a flow meter.
[0019]
Next, the operation of the inert gas delivery device morphism molding machine is configured as described above.
When the supply hopper 3 and the drying hopper 6 contain more resin material than the predetermined amount, the solenoid valves 34 and 35 are opened, and nitrogen gas is sent from the supply source 28 to the supply hopper 3 and the drying hopper 6 to supply the resin material. Air is forcibly leaked to the outside through a gap between the feed hopper 3 and the drying hopper 6 and the like and the transfer pipe 7 is filled, so that the oxidation of the resin material in the supply hopper 3, the drying hopper 6 and the transfer pipe 7 is prevented. Is done. Also, the solenoid valve 36 is always opened, and nitrogen gas is sent into the material tank 16 to expel air from the gap of the material tank 16 and fill the material tank 16 and the transfer pipe 17 as described above. The resin material in the transfer pipe 17 is also prevented from being oxidized. Note that the above-mentioned gap that enables the elimination of air, in other words, the supply of nitrogen gas, is formed at the time of manufacturing or assembling the supply hopper 3, the drying hopper 6, or the like, or is formed inevitably or intentionally. .
[0020]
The nitrogen gas sent from the inlet pipe 26 to the drying hopper 6 through the air feeding pipe 21 and the feeding pipe 12 is dehumidified by the dehumidifier 14 and then heated by the heater 11 to enter the drying hopper 6 to be dried. The resin material in the hopper 6 is dried.
[0021]
When the resin material in the supply hopper 3 is reduced to a predetermined amount and a signal is output from the level sensor 38, the solenoid valve 34 is closed and the loader 8 is operated to transfer the resin material in the drying hopper 6 to the supply hopper 3. I do. This state continues for the time set in the timer, and when the set time has elapsed, the solenoid valve 34 opens again and the loader 8 stops.
[0022]
When the resin material in the drying hopper 6 is reduced to a predetermined amount and a signal is output from the level sensor 39, the solenoid valve 35 is closed and the loader 18 is operated to remove the resin material in the material tank 16 from the drying hopper 6. Transfer to This state continues for the set time of the timer, and when the set time has elapsed, the solenoid valve 35 opens again and the loader 18 stops.
[0023]
In the above, during the suction operation of the loaders 8, 18, the solenoid valves 34, 35 are closed, and the supply of nitrogen gas to the hoppers 3, 6 is refused, so that wasteful use of nitrogen gas is prevented. As a result, the resin material is smoothly vacuum-transferred without any trouble.
[0024]
The amount of nitrogen gas supplied from the supply source 28 is adjusted by the flow rate limiting valve 45, and the amount of nitrogen gas supplied to the material tank 16 by the supply hopper 3, the drying hopper 6, and the material tank 16 is adjusted by the flow rate control valves 31, 32, and 33. .
[0025]
In the present invention, the inert gas supply source 28 is not limited to the one shown in FIG. 2, but may have another structure . The dehumidifier 14 is usually provided with a cooler in order to increase the dehumidification efficiency. The air blower 20 can be omitted. When the resin material reaches a predetermined amount, the supply hopper 3 and the drying hopper 6 output a signal to stop the loaders 8 and 18 and provide a level sensor for opening the electromagnetic valves 34 and 35 instead of the timer. Is also good. Further, instead of the loaders 8 and 18 for transferring the resin material by vacuum, a transfer device for transferring the resin material by a pressurized gas can be used. In this case, an inert gas is used as the pressure gas. Although the feed pipe 25 in the figure is connected to the lower part of the supply hopper 3, it may be connected to the heating cylinder 1 so that nitrogen gas flows into the supply hopper 3.
[0029]
【The invention's effect】
As described above, according to the first aspect of the present invention, the supply hopper for supplying the resin material to the heating cylinder is provided to the drying hopper for drying the resin material, and the resin material is supplied from the drying hopper to the supply hopper by the operation of the loader. In an inert gas feeder of an injection molding machine, which is connected by a transfer pipe for transferring and has an electromagnetic valve provided in a feed pipe in which the above-mentioned supply hopper is connected to a source of inert gas, the vacuum of the resin material by the above-mentioned loader The electromagnetic valve is closed at the time of transfer, and the electromagnetic valve is opened at the time of stoppage of the loader to feed the inert gas to the supply hopper. The invention according to claim 2 , wherein the resin material is dried and heated in the material tank. A drying hopper to be charged into the supply hopper of the cylinder is connected by a transfer pipe for vacuum-transferring the resin material from the material tank to the drying hopper by the operation of the loader, and the drying hopper is connected to an inert gas supply source. In an inert gas feeding device of an injection molding machine in which an electromagnetic valve is provided in a feeding pipe, the electromagnetic valve is closed when the loader transfers the resin material by vacuum, and the electromagnetic valve is opened when the loader is stopped to open the inert gas. Is fed into the drying hopper, so that the resin material can be smoothly transferred without wasting the inert gas gas.
[0030]
In this case, if the transfer operation of the loader and the closing operation of the electromagnetic valve are performed by an output signal of a level sensor that outputs a signal when the resin material in the hopper decreases to a predetermined amount, the transfer operation of the loader and the electromagnetic valve Can be precisely synchronized with each other.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating an example of an inert gas supply device of an injection molding machine that performs a method according to the present invention.
FIG. 2 is a diagram illustrating an example of an inert gas supply source.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 heating cylinder 3 supply hopper 6 drying hopper 7, 17 transfer pipes 8, 18 loader (transfer device) 12 feed pipe 16 material tank 25, 26, 27 feed pipe 28 supply sources 31, 32, 33 flow control valves 34, 35 , 36 Solenoid valve 38, 39 Level sensor

Claims (3)

樹脂材料を乾燥させる乾燥ホッパに、樹脂材料を加熱筒に供給する供給ホッパが、ローダの作動により樹脂材料を上記乾燥ホッパから供給ホッパに真空移送する移送管で接続され、上記供給ホッパを不活性ガスの供給源に接続した送入管に電磁弁が設けられた射出成形機の不活性ガス送入装置において、
上記ローダによる樹脂材料の真空移送時に上記電磁弁を閉じ、ローダの停止時に電磁弁を開いて不活性ガスを供給ホッパに送入することを特徴とする射出成形機の不活性ガス送入方法。A supply hopper that supplies the resin material to the heating cylinder is connected to a drying hopper that dries the resin material by a transfer pipe that vacuum-transfers the resin material from the drying hopper to the supply hopper by the operation of the loader, and the supply hopper is deactivated. In an inert gas feeding device of an injection molding machine provided with a solenoid valve in a feeding pipe connected to a gas supply source,
An inert gas feeding method for an injection molding machine, wherein the electromagnetic valve is closed when the resin material is vacuum-transferred by the loader, and when the loader stops, the electromagnetic valve is opened to feed an inert gas to a supply hopper. 材料タンクに、樹脂材料を乾燥して加熱筒の供給ホッパに投入する乾燥ホッパが、ローダの作動により樹脂材料を上記材料タンクから乾燥ホッパに真空移送する移送管で接続され、上記乾燥ホッパを不活性ガスの供給源に接続した送入管に電磁弁が設けられた射出成形機の不活性ガス送入装置において、
上記ローダによる樹脂材料の真空移送時に上記電磁弁を閉じ、ローダの停止時に電磁弁を開いて不活性ガスを乾燥ホッパに送入することを特徴とする射出成形機の不活性ガス送入方法。A drying hopper that dries the resin material and puts it into the supply hopper of the heating cylinder is connected to the material tank by a transfer pipe that vacuum-transfers the resin material from the material tank to the drying hopper by the operation of the loader. In an inert gas feeding device of an injection molding machine provided with an electromagnetic valve in a feeding pipe connected to a source of active gas,
An inert gas feeding method for an injection molding machine, characterized in that the electromagnetic valve is closed when the resin material is vacuum-transferred by the loader, and when the loader is stopped, the electromagnetic valve is opened to send an inert gas to a drying hopper. ローダの移送作動と電磁弁の閉作動を、ホッパ内の樹脂材料が所定量に減少した場合に信号を出力するレベルセンサの出力信号によって行うことを特徴とする請求項１又は２記載の射出成形機の不活性ガス送入方法。 3. The injection molding according to claim 1 , wherein the transfer operation of the loader and the closing operation of the solenoid valve are performed by an output signal of a level sensor that outputs a signal when the resin material in the hopper decreases to a predetermined amount. How to send inert gas to the machine.
JP29299797A 1997-10-24 1997-10-24 Inert gas feeding method for injection molding machine Expired - Fee Related JP3584426B2 (en)

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JP4839480B2 (en) * 2006-10-02 2011-12-21 株式会社フクハラ Nitrogen gas supply method and supply apparatus in resin molding machine
JP6242108B2 (en) * 2013-08-02 2017-12-06 株式会社カワタ Powder processing equipment
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