JP3853251B2

JP3853251B2 - A quantitative feeder mechanism and a system device with the mechanism

Info

Publication number: JP3853251B2
Application number: JP2002140793A
Authority: JP
Inventors: 宗克神谷
Original assignee: 市川十四男
Priority date: 2002-04-09
Filing date: 2002-04-09
Publication date: 2006-12-06
Anticipated expiration: 2022-04-09
Also published as: JP2003300211A

Description

【０００１】
【発明の属する技術分野】
本発明は、射出又は押出成形機に付設する原料供給技術に係り、特に顆粒、ペレット状を含む流動性熱可塑性固形原料を定量化して供給し、かつ原料の成形機直前環境を改善して製品の成形条件を改良する製造技術に関するものである。
【０００２】
【従来の技術】
この種の成形システム装置には、図５と図６に示すフィーダを設置しないで小ホッパー２から成形機の本体装置７に供給するタイプや、図７に示す該本体装置直前にフィーダ１０を介して供給する従来技術がある。いずれの場合にあっても予め使用する原料を、小形に加工して空気流動下のもとに流動性を与えた樹脂等から成る熱可塑性の固形原料（以下、単に原料という）を用いる。図５に示すもの（以下、従来例１という）は、バッチ式で固形原料を供給する簡易構造型のもの、図６に示すもの（以下、従来例２という）は、連続的に原料元ホッパー４からクッションホッパー２へブロワ１２が空気輸送源となり、原料供給管２Ａを介し、その途中にホッパー前シャッタ９ａによる制御を加えて原料を自動補給し、原料供給後は排気管２Ｂを介して排気している。クッションホッパー内原料は、ホッパー後シャッタ９ｃを介して成形機の本体装置７に供給し、その装置直前に立設する供給筒６内にセンサー１３を設置し、その原料検知信号を信号線２Ｄを介してコントローラ１４によって信号処理し、その処理によって前記ブロワを制御すると共に、本体装置加熱部１１において原料を加熱、溶融することによって熱可塑性樹脂から脱離、分離するガス成分を、真空吸引管２Ｃを配管して真空ポンプ１５によって強制排除している（資料１：「プラスチックス」２００２．２月号、ｐｐ３０、図２）。
ここに、図７に示すものを含め、いずれの本体装置７の内部構造も、メインシリンダ７ａに内張りされたメインシリンダスリーブ７ｂと、メインスクリュ８ａに巻装するメインスクリュブレード８ｂとの刃先間の空隙、片隙間Ｓ０は、通常０．１ｍｍを保持して形成し、ホッパー２ないし供給筒６下部のフィード口４ｃ、本体装置側受入口４ｄを経て原料を受け入れ、メインスクリュ８ａの回転速度によって加熱部１１へ搬送する原料供給量を調節する構成は変わらない。
フィーダを設置する図７に示すもの（以下、従来例３という）は、本体装置７への原料供給量を定量化する改善手法（綾井英二氏提案「飢餓的供給システム」）を示し、その定量供給を、受入口４ｄにおける原料の供給状態をメインスクリュが搬送できる最小量、即ち供給筒６内に原料が積み上げる現象が発生しないように、フィードスクリュー５の吐出側端部に同図（Ｂ）に示す定量フィーダ１０と供給筒６を設けてフィード口４ｃからの原料吐出量を調整操作し、従来例１と従来例２ではできない原料供給を保持するようにしている。なおこのフィーダは水平置型で、そのフィードスクリュー５外壁に螺旋状に巻装するフィードスクリューブレード５ａ（外径ｄ）とフィードシリンダ３ｃに内張りするフィードシリンダスリーブ３ｄ（内径Ｄ）との間に形成する片隙間Ｓ１＝（Ｄ−ｄ）／２は、本体装置７に倣って前記Ｓ０と同じ隙間０．１ｍｍを保持している。
【０００３】
一般に、成形機で発生するガスや水分は、本体装置の受入前に充分に乾燥処理した原料でも、溶融樹脂中に再吸湿させてしまうと、成形条件が悪化する。ここにペレット状を含む原料樹脂の許容乾燥状態は、吸水率０．２％ＷＴ以下（１ｔｏｎの樹脂当たり２００ｃ／ｃ）であって、連続成形操作中に発生する水蒸気体積は無視できない容積となり、成形操作の事前に乾燥操作を継続し、充分に脱離成分を排除して、成形操作が行える場合には、成形機の最終工程に配置する金型に生じる汚れは減少する。ところで飢餓的供給法に基づく従来例３においては、本体装置７内の原料搬送状況は、メインシリンダスリーブ７ｂ内上部に空間が出来易く、加熱操作時に溶融ペレットから生じるガスや水蒸気などの脱離成分はメインシリンダ内部を抜けて、供給筒６、フィーダ１０を介して更に上昇し、その過程で加熱された気流が本体装置７供給前のペレット樹脂を乾燥させ、その乾燥効果の結果、成形機最終工程において良好な成形品を生み、製品不良率発生を低下させるという好結果をもたらす。その汚れに起因する金型の焼け、ウエルドライン及びショートショット、及び成形品の光沢など、外観不良を含む成形不良の発生率は汚れの減少により改善し、金型分解、洗浄費用等を削減できる。
【０００４】
図８に示す模式図により各従来例フィーダ機構の原料搬送状態を示す。同図（Ａ）で示す従来例１では、加熱部１１で原料が溶融して減容する以外、原料の搬送カサ密度最も大であるＦ１手前のＦ２状態に調節したクッションホッパー２内では、堆積ないし原料自重によるブリッジが生じる供給過疎の恐れがある。原料に混合する充填材により加熱時に発生するガスが、フィード側に戻らずに金型に混入し、高温系樹脂原料の成形例にはメインシリンダ８ａに異常摩耗を起こす。同図（Ｂ）で示す従来例２では、供給筒６とホッパー後シャッタ９ｃが、従来例１よりブリッジ発生の恐れは、ホッパーシャッタ下の中間スペースＦＳの存在によって緩和するが、バッチ供給に伴う原料粒子間摩擦や原料自重は堆積を起こし、堆積Ｆ２状態を、構造上、避けられない。
堆積を起こす従来例１と従来例２に比べて、同図（Ｃ）に示す従来例３では、フィードスクリュ５の回転操作を調節することによって、本体装置７の受入口４ｄに原料溜まりが生じない操作を行うことは容易である。従って本体装置７内のメインスクリュ８ａ回転操作の押し込み効果によって、原料カサ密度が（粗）のＦ４状態から、Ｆ４→Ｆ２の（粗→密）に変化する過程のＦ３状態を経て、Ｆ１状態にカサ密度を最大に高めることが可能になった。しかしフィーダの回転操作を制御しても、原料が大きくなると原形破壊が増える現象を抑制できず、フィードスクリュの異常摩耗も新規に生ずる。なおクッションホッパー２内には、ここに図示しないホッパー内シャッタによって槽内を上下に二分し下槽にパドル式レベル計を配置して、原料の溜まりを少な目、即ちＦ１状態が生じても回転操作でカサ状態を制御するので、フィードシリンダスリーブ３ｄ内には空隙ができる。
【０００５】
一般に本体装置７内部から発生する加熱原料の脱離成分をその機外へ排除し、さらにフィーダやホッパーの補助装置から成形設備外へ運び出すために、図６や図７に示す排気、ガス抜きのための配管系を設けて、成形機と付設設備全体が有機的に配設され、一つのシステム装置を構成し、その構成の価値と適正操作が、成形機の最終工程で得られる製品の価値、即ち初期費用、動力経費、製品不良率、清掃サイクル、補修サイクルのデータを決定する。
図６に示す従来例２では、ブロワ１２による駆動空気源系により、ホッパー前シャッタ９ａとホッパー後シャッタ９ｃ操作によるバッチ式コントロールが、間欠的にほぼ定量化して原料供給する配管系とガス抜き用の真空吸引管２Ｃの、２系の配管システムを付設するシステム装置を構成する。
図７（Ａ）に示す従来例３は、吸引式空気輸送装置９とクッションホッパー２を半循環する配管系の１系を配設してシステム装置を構成する。（資料２：日水化工（株）総合製品案内「システム輸送タイプＬＫ型」、ｐｐ２，カタログ９５１０−３０００）。従来例３における吸引式空気輸送装置９が発生する負圧力が原料搬送力となり、この一系配管によって従来例２のシステム装置より全体設備の初期費用と保全作業、ランニングコスト費用を安価にしている。即ち、従来例３にあっては、飢餓的供給法に従って構成した水平置き型フィーダ１０とシステム装置は、成形工程を良好に操作する上で、有機的な不過分の関係にある。
【０００６】
【発明が解決しようとする課題】
良品を製造する成形機の本体装置の良い成形工程操作には、付帯設備が果たす役割が重要である。従来例２において成形機と供給筒６間に形成する狭い空間はホッパー後シャッタ９ｃによってほぼ密閉状態にあり、発生ガスの濃い濃度分布は本体装置内部に留まり易く、供給筒６下部での搬送カサ密度が大のＦ１状態では、原料自重により隣接する原料同志の擦過が生じ、その結果、原料は細粒化し、細かくなった原料は加熱部１１底部に滞留し、成形品の「焼け」原因となる。
従来例３について、図８（Ｃ）に示すように、水平置き型フィーダ１０のフィード口４ｃを観察した結果、フィードスクリュ５の吐出側端部の下部部分から原料供給がＦ３状態で行われるのでなく、不定期に同端部の上部部分からの原料供給がＦ４状態で生じていることが観察された。この不定期現象によって、従来例３の定量制御操作は不正確であること、さらに供給筒６からクッションホッパー２に抜けて排気管２Ｂに吸引されるガス抜き効果も不十分であることが判った。
本発明は、顆粒、ペレット状を含む原料を用いて溶融操作し、その溶融材を金型に受けて成形品を製造する製造手段としての、定量フィーダとそのフィーダ付設システム装置に係る上記した問題点に鑑み、改善手段として開発したもので、飢餓的供給法によって操作するのに最適な、原料の定量フィーダ機構に改良して、フィーダから供給筒へ定量化した原料供給が行える定量フィーダ装置の構造を決定すると共に、経済性に有効で積極的なガス吸引手段を新設して、正確に定量化した原料供給によって、成形機の本体装置内部に、改善された原料環境を作り出せる搬送操作が行える成形機製造技術を提供することを目的とするものである。
【０００７】
【課題を解決するための手段】
本発明に係る定量フィーダは、原料元ホッパーと原料供給管とクッションホッパーと排気管と吸引式空気輸送装置とを順次接続配管し、クッションホッパー下部に上向き供給式傾斜形定量フィーダ機構と成形機本体装置とを設けた上で、フィーダ機構にはフィードシリンダスリーブとフィードスクリューブレード間に原料大以上の隙間を設定し、フィードシリンダスリーブの可変速回転操作によって原料を移送する上向き先端に供給筒を垂設する定量フィーダ機構において、フィーダ機構（３）を設置する傾斜角（θ）を、原料（Ｍ）が示す安息角前後の角度に構成し、該機構内のフィードシリンダスリーブ（３ｄ）とフィードスクリューブレード（５ａ、５ｂ）間の隙間（Ｓ）を原料（Ｍ）の大きさに対応して変更可能にするフィードシリンダスリーブ（３ｄ）を形成し、あるいは加えて供給筒（６）に硬貨ガラス管から成る透明部（６ａ）を設けて原料（Ｍ）の供給状態を確認可能にすることを特徴とするものである。
【０００８】
そして本発明に係る定量フィーダ機構付きシステム装置は、定量フィーダ機構を付設する定量フィーダ機構付きシステム装置であって、供給筒付設のガス抜き口を吸引式空気輸送装置に接続する排気管に直接、接続配管して、供給筒内部空気の吸引操作を介して成形機本体装置内部発生ガスを常時強制吸引保持状態可能に構成することを特徴とするものである。
【０００９】
【作用】
以上のように構成した本発明の定量フィーダ機構３は、クッションホッパーから受け入れた原料を、フィードスクリューの上側を回り込んで供給される原料供給量誤差が生じないように、フィードスクリューを傾斜して搬送し、その傾斜の程度を原料の安息角を基準に上方へ搬送するフィード装置の設置傾斜角を決めるとともに、その傾斜角の程度をフィードスクリューブレードとフィードシリンダスリーブ間の空隙大きさに対応させ広く空けて決めたので、原料供給時に原料の姿形を破壊せず、供給時の原料自重による圧密現象も生じない。さらに供給筒に透明部を設けて原料の供給状態を確認できるようにしたので、フィード口上側からのばらつき供給現象を生じることのない定量化回転フィード操作が視認下に行え、計量管理の誤差が減少した。その上に機械装置の各部分に生じる原料移送に伴う摩耗の発生が激減し、使用電動機出力が低減すると共に、相乗的にフィード装置自体が小型化、軽量化できた。また供給筒上部に設けたガス抜き口は、クッションホッパー内の乾燥排気流と明確に区分できたので、本体装置発生ガスがクッションホッパーへ混入するガス移動は無くなった。そして定量フィード機構の装置傾斜角を原料の安息角の物性に合わせて決めたので、移送原料がフィード機構の下方へ逆流する傾向を防止でき、機構の底部や中間に堆積せず、従って原料毀損による細粒、粉末化現象が起こらず、その上にフィードスクリュー上部空間から原料が回り込むことによる計量誤差や上部空間閉塞などのスリーブ回転の駆動出力増加を起こさせる原因がない。
同様に定量機構付きシステム装置１は、供給筒ガス抜き口を直接、排気管に接続配管する常時強制吸引排気式にして、クッションホッパーを通過させない排気方式にしたので、本体装置内部発生ガス排気時の空気抵抗が最小条件下でガス抜きがし易くなり、さらに供給原料には細粒、粉末等が激減するので本体装置内で樹脂溶融状態が改善し、本体装置が製造する樹脂の成型時において、従来、金型に多く生じたデポジット発生などの不具合が減少した。さらに本発明システム装置１は、原料供給に用いる吸引式空気輸送装置を本体装置のガス抜き排気に兼用して強制吸引するので、専用の吸引手段を特設せずに済む。
【００１０】
【発明の実施の形態】
以下、本発明に係る定量フィーダ機構とその機構付きシステム装置を図によって説明する。ここに、図１は、本発明の定量フィーダ機構を説明するもので、その構成を示す側断面を含む部分側面図、図２は、本発明の定量フィーダ機構付きシステム装置を説明するもので、そのシステム構成を示す側面図、図３は、本発明の定量フィーダ機構の実施例を説明するもので、（Ａ）はその１実施例を示す部分側断面図、（Ｂ）は他の実施例を示す部分側断面図、そして図４は、本発明の定量フィーダ機構の特徴を説明するもので、（Ａ）は原料搬送状態を示す模式図、（Ｂ）は原料搬送の内部構造を示す部分側断面図である。
【００１１】
本発明の定量フィーダ機構３は、図１に示すように、クッションホッパー２下部の原料投下口４ｂ位置からフィード口４ｃ方向に傾けて上向かせ、その傾斜角θは原料物性の安息角前後に選択し、かつ成形機の本体装置７の受入口４ｄに立設する供給筒６と連結している。そして可変速可能の減速機構付きフィーダ３の動力駆動によるフィードスクリュー５の回転操作を経て、クッションホッパー２から本体装置７へほぼ閉鎖的に上向き搬送した原料を供給可能に構成している。フィードスクリュー５に巻装するフィードスクリューブレード５ａの刃先と、フィードシリンダスリーブ３ｄ間の隙間Ｓ２は、原料大きさより充分広く形成し、さらに供給筒６の頂部には、ガス抜き口２ｂを付設している。
【００１２】
また本発明の定量フィーダ機構付きシステム装置１は、図２に示すように、クッションホッパー２、定量フィーダ機構３、供給筒６の順に組み立て、成形機の本体装置７上側に立設する該供給筒頂部付設のガス抜き口２ｂを、自然換気可能に設け、あるいは強制吸引排気するために排気管２Ｂに配管接続して、本体装置７に連通可能に構成する。なお図４（Ｂ）に示すように、フィード構造の一部又は全区間に亘って形成する、フィードシリンダスリーブ３ｄ内径Ｄとフィードスクリュブレード５ａ外径ｄとの間の隙間Ｓ２は、原料Ｍがペレット状であっても、錠剤、顆粒の形態であっても、それら原料の内、一番大きな形態の大きさより充分大きいことが必要である。
【００１３】
【実施例】
本発明の、定量フィーダ機構３の実施例を図１ないし図３について説明する。ペレット状の成形原料に用い、定量フィード機構３を、ペレット樹脂の安息角とほぼ同じの設置傾斜角θ＝π／６とし、用いたペレットＭ大きさより充分に広く、フィードスクリュブレード５ａの刃先とフィードシリンダスリーブ３ｄ間との隙間Ｓ２＝６ｍｍを設定した。供給筒６上部駆体にガス抜き口２ｂを付設し、該供給筒中間部に硬質ガラス管から成る透明部６ａを、該上部駆体と供給筒取付部６ｂ間に固定する４本の支柱によって外部から締め付けて密封状に組み立てている。ここにフィードスクリュー５を窒化材、フィードシリンダスリーブをＳＵＳ４４０ＣＨＲＣ４５で製作した。なお３ｂは、精密部品成形時に厳密に原料供給する上で不可欠の、定量フィーダ駆動源サーボモータ用のコントローラであり、４ａは原料供給口、また２ａはクッションホッパーの排気口、Ｈは供給筒６の上部駆体下部高さで、２０ｃｍとした。なお図３に示すように、原料大きさより隙間Ｓを狭くしてＳ１にしたもの、原料大きさより充分に広くした隙間Ｓ２（＞Ｓ１）を設けたもの、該両隙間（Ｓ１、Ｓ２）を設けるためにフィードスクリューブレード５ａ及び／または５ｂを混在させたものなどから成る、フィードスクリュー５を形成しても良い。同図（Ａ）に示す定量フィード機構３は、ここに図示しない供給筒のフィード口に面するフィードスクリューブレード部分をほぼ１周分、幅広に形成してペレット大きさより小さい隙間Ｓ１を形成し、その他の区間部分の隙間Ｓ２はペレット大きさより充分広く形成したもので、設置傾斜角θがペレット安息角の大きさ以下の小の場合に実施する。また同図（Ｂ）に示すものは、予め充分広い同一の隙間Ｓ２を全てに形成した上で、ここに図示しない供給筒６のフィード口側フィードスクリューブレード５ａ、５ｂ部分を含む他のブレード部分に対して、隙間Ｓを狭くするようにブレードカバーを付け加えて帳設し、又は予め巻装してほぼ１周分、前記ブレード刃先を狭い隙間Ｓ１に形成するもので、これら処置はペレットがフィード口４ｃの上側空隙から間欠的に落下するなどの、設置傾斜角θの傾斜不足が原因の不具合に対処するためのもので、この対処はフィールド実施テストによる確認作業に基づいて、適時、付加着装する。
【００１４】
前記した定量フィーダ機構の実施例を組み込んで、本発明の定量フィーダ機構付きシステム装置を構成した実施例を図２について説明する。本実施例では、定量フィーダ機構３の供給筒６頂部に付設するガス抜き口２ｂを、排気管２Ｂに配管接続して、強制吸引排気するようにした。そして通常のテスト運転を約１年間、使用原料をペレット状にしたものを４６ナイロン樹脂を主材に、添加材混合比で全体の３０％をグラスファイバーを付加、含有させたものを供給して行った。本実施例と、前記した従来例１ないし従来例３を、それぞれ順次比較例１ないし比較例３として比較したものを、表１に示す。この表中において、それぞれのシステム装置は添付する図面番号又は指定図番中の記号によって適用図を示した。
【００１５】
【表１】

【００１６】
本発明のシステム装置の実施例では、表１に示す以外に、フィードスクリュー５の回転により、フィーダ内部ではペレット同志が良好に摩擦接触して、終始、良好な計量状態にあった。図４（Ａ）に示すように、クッションホッパー２内部の原料貯留状態が堆積が生じない程度のＦ２状態に調整される場合に、定量フィーダ機構３内部のペレットの状態は、ここに記載しないフィードスクリュの回転操作によって（粗→密）変化する過程のＦ３状態に保持して上向き供給され、ペレット状原料は瞬時に供給筒６に到達して原料カサ密度が（粗）のＦ４状態になってパラパラと落下する。本体装置７に落下した後は、体積移動速度一定状態を保持して、前記従来例３における本体装置内のペレットと同様な搬送状態を示す。すなわち供給筒６直下の本体装置７受入口４ｄ近くのメインブレード８ｂの谷部には、ペレットは堆積せず良好な空間が認められた。そのために加熱部１１直前部分のペレット助走区間では、加熱原料からの良好なガス成分の分離が生じた。
なお故意に定量フィード機構３の吐出口を塞いだ際、詰め込まれたペレットに、フィードスクリュー５は空転した。その空転動作はペレットの圧密を進行させず、電動機の過負荷状態は危険域に進まず、僅かにペレットに軽微な破壊が生じただけでその破壊障害発生の範囲は狭く、かつフィード装置構成材に摩耗の痕跡を認めなかった。文献引用による比較例２を除く他の実施例では補修を必要とするまで運転し、補修が必要なくとも１２ヶ月間で運転を中止し、運転データを得た。
【００１７】
このように構成した本発明の実施によって、充分な脱離成分の除去効果が得られて、薄肉のＡＢＳ樹脂ペレットの成形品成形において、比較例３ではショートモールドが５０ＰＰＭ生じたが、実施例では０ＰＰＭであった。さらに分散剤に水酸化アルミニウムを添加し、高温でその混合ペレットを成形する場合に、分散剤が分解して発生する水蒸気成分の脱気除去や、エラストマー系樹脂使用時に生じる残留水の蒸気化による有効な機外排気が達成出来た。
なお本発明の好適な実施対象には、例えば１型当たり４−６個取り、１ショット総合製品重量１５ｇ程度の小形部品の精密部品成形や、特にプラスチック製品以外の熱可塑性固定原料を用いる食品加工や薬剤の製剤用に適用できる。
【００１８】
【発明の効果】
本発明の、定量フィーダ機構とその機構付きシステム装置によれば、原料物性に基づき上向き搬送可能にした該フィーダ機構の傾斜配置と、原料大きさをその機構内空隙形成の設計要件とした定量フィーダ機構３を構成し、この定量フィーダ機構を付設するシステム装置１の配管系２Ａ、２Ｂ、２ｂを有機的に組織化して、成形機内メインスクリュ８ａが搬送できる最小量を、いわゆる飢餓供給法に従い定量的に供給することによって最良の成形樹脂を供給する最適なシステム化を、定量フィーダ機構を改善することによって実施可能とする条件作りを行うとともに、その総合効果として電動機出力低下を実現し、その結果、定量フィード装置３は小型化、省エネ化し、定量供給は格段と安定化した。しかもシステム装置１の初期費用の対費用効果は高まり、同種装置はより普及し易い価格帯に収まった。その上、本発明装置１が製造する成形品の品質は向上して不良品発生率が低減し、金型清掃やフィードスクリュー交換を含む保守・補修コストは数分の一以下になるなど、本発明技術によって非常に安定した運転操作が実現し、成形製造技術一般の向上に広く寄与する。
【図面の簡単な説明】
【図１】本発明の定量フィーダ機構を説明するもので、その構成を示す側断面を含む部分側面図である。
【図２】本発明の定量フィーダ機構付きシステム装置を説明するもので、そのシステム構成を示す側面図である。
【図３】本発明の定量フィーダ機構の実施例を説明するもので、（Ａ）はその１実施例を示す部分側断面図、（Ｂ）は他の実施例を示す部分側断面図である。
【図４】本発明の定量フィーダ機構の特徴を説明するもので、（Ａ）は原料搬送状態を示す模式図、（Ｂ）は原料搬送の内部構造を示す部分側断面図である。である。
【図５】フィーダ機構に係る従来技術を説明するもので、従来例１（ホッパ直結型成形機）を示す部分側断面図である。
【図６】システム装置に係る従来技術を説明するもので、従来例２（シャッタ開閉式フィーダ付きシステム装置）を示す部分側断面図である。
【図７】システム装置とその付設フィーダ機構に係る他の従来技術を説明するもので、（Ａ）は従来例３（水平置型定量フィーダ付きシステム装置）を示す側面図、（Ｂ）はその定量フィーダ（水平置型定量フィーダ）を示す部分側断面図である。
【図８】従来技術におけるフィーダ機構の原料搬送状態を説明するもので、（Ａ）は従来例１についての状態を示す模式図、（Ｂ）は従来例２についての状態を示す模式図、（Ｃ）は従来例３についての状態を示す模式図である。
【符号の説明】
１システム装置
２クッションホッパー
２ａ排気口
２ｂガス抜き口
２Ａ原料供給管
２Ｂ排気管
２Ｃ真空吸引管
２Ｄ信号線
３フィーダ
３ａサーボモータ
３ｂコントローラ（サーボモータ用）
３ｃフィードシリンダ
３ｄフィードシリンダスリーブ
４原料元ホッパー
４ａ原料供給口
４ｂ原料投下口
４ｃフィード口
４ｄ受入口
５フィードスクリュ
５ａ、５ｂフィードスクリュブレード（又は同外包線）
６供給筒
６ａ透明部
６ｂ供給筒取付部
７本体装置（押出機／射出成形機）
７ａメインシリンダ
７ｂメインシリンダスリーブ
８減速装置（本体用）
８ａメインスクリュ
８ｂメインスクリュブレード（又は同外包線）
９吸引式空気輸送装置
９ａホッパー前シャッタ
９ｂホッパー内シャッタ
９ｃホッパー後シャッタ
１０水平置型フィーダ
１１加熱部
１２ブロワー
１３センサー
１４コントローラ
１５真空ポンプ
Ｄスリーブ内径
ｄスクリュブレード外径
Ｆ１原料搬送カサ密度大の状態、Ｆ１（密）＞Ｆ２＞Ｆ３＞Ｆ４（粗）
Ｆ２Ｆ１状態手前の状態
Ｆ３Ｆ４→Ｆ２の（粗→密）変化する過程の状態
Ｆ４原料カサ密度が（粗）の状態
ＦＳホッパーシャッタ下の中間スペース
Ｈ透明筒を含む高さ
θ フィーダ装置設置傾斜角
Ｓシリンダスリーブとスクリューブレード間の隙間、（Ｄ−ｄ）／２
Ｓ０同上部分の隙間（本体装置）
Ｓ１同上部分の、原料大きさより狭い隙間（フィーダ）
Ｓ２同上部分の、原料大きさより広い隙間（フィーダ）[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a raw material supply technology attached to an injection or extrusion molding machine, and in particular, quantifies and supplies a fluid thermoplastic solid raw material including granules and pellets, and improves the environment immediately before the raw material molding machine. The present invention relates to a manufacturing technique for improving the molding conditions.
[0002]
[Prior art]
In this type of molding system apparatus, the feeder shown in FIG. 5 and FIG. 6 is not installed and the feeder is supplied from the small hopper 2 to the main body device 7 of the molding machine, or through the feeder 10 immediately before the main body device shown in FIG. There is a conventional technology to supply. In either case, a raw material used in advance is a thermoplastic solid raw material (hereinafter simply referred to as a raw material) made of a resin or the like that has been processed into a small size and imparted fluidity under air flow. The one shown in FIG. 5 (hereinafter referred to as Conventional Example 1) is of a simple structure type that supplies a solid raw material in a batch type, and the one shown in FIG. 6 (hereinafter referred to as Conventional Example 2) is continuously a raw material hopper. The blower 12 serves as an air transportation source from 4 to the cushion hopper 2 and is automatically replenished via the raw material supply pipe 2A, controlled by the shutter 9a before the hopper in the middle, and exhausted through the exhaust pipe 2B after the raw material is supplied. is doing. The raw material in the cushion hopper is supplied to the main body device 7 of the molding machine via the shutter 9c after the hopper, the sensor 13 is installed in the supply cylinder 6 standing immediately before the device, and the raw material detection signal is sent to the signal line 2D. The controller 14 performs signal processing, and the blower is controlled by the processing, and the gas component desorbed and separated from the thermoplastic resin by heating and melting the raw material in the main body heating unit 11 is supplied to the vacuum suction pipe 2C. And forcibly removed by the vacuum pump 15 (Document 1: “Plastics” 2002.02 issue, pp30, FIG. 2).
Here, the internal structure of any of the main body devices 7 including those shown in FIG. 7 is between the cutting edges of the main cylinder sleeve 7b lining the main cylinder 7a and the main screw blade 8b wound around the main screw 8a. The gap and the piece gap S0 are usually formed by holding 0.1 mm, and the raw material is received through the feed port 4c at the lower part of the hopper 2 or the supply cylinder 6 and the main body side receiving port 4d, and heated by the rotational speed of the main screw 8a. The structure which adjusts the raw material supply amount conveyed to the part 11 does not change.
The one shown in FIG. 7 where the feeder is installed (hereinafter referred to as Conventional Example 3) shows an improved method for quantifying the amount of raw material supplied to the main unit 7 (proposed by Eiji Arai “Hunger Supply System”), and its quantification (B) at the discharge side end of the feed screw 5 so that the supply of the raw material at the receiving port 4d is the minimum amount that the main screw can convey, that is, the phenomenon that the raw material accumulates in the supply cylinder 6 does not occur. Are provided to adjust the amount of raw material discharged from the feed port 4c so as to maintain the raw material supply that cannot be achieved in the conventional example 1 and the conventional example 2. This feeder is of a horizontal type and is formed between a feed screw blade 5a (outer diameter d) spirally wound around the outer wall of the feed screw 5 and a feed cylinder sleeve 3d (inner diameter D) lining the feed cylinder 3c. The single gap S1 = (D−d) / 2 keeps the same gap of 0.1 mm as S0 following the main body device 7.
[0003]
In general, if the gas and moisture generated in the molding machine are reabsorbed in the molten resin even if the raw material is sufficiently dried before receiving the main body device, the molding conditions deteriorate. Here, the allowable dry state of the raw material resin including pellets is a water absorption of 0.2% WT or less (200 c / c per 1 ton of resin), and the water vapor volume generated during the continuous molding operation is a volume that cannot be ignored. If the drying operation is continued prior to the molding operation to sufficiently remove the desorbed components and the molding operation can be performed, the contamination generated on the mold placed in the final process of the molding machine is reduced. By the way, in the prior art example 3 based on the starvation supply method, the raw material conveyance situation in the main body device 7 is that a space is easily formed in the upper part of the main cylinder sleeve 7b, and desorption components such as gas and water vapor generated from the molten pellets during the heating operation. Passes through the inside of the main cylinder and further rises through the supply cylinder 6 and the feeder 10, and the air flow heated in the process dries the pellet resin before supplying the main body device 7, and as a result of the drying effect, the molding machine finally The process yields good results in producing good molded products and reducing the product defect rate. The occurrence rate of molding defects including appearance defects such as mold burns, weld lines and short shots due to dirt, and gloss of molded products can be improved by reducing dirt, and mold disassembly and cleaning costs can be reduced. .
[0004]
The schematic diagram shown in FIG. 8 shows the material conveyance state of each conventional feeder mechanism. In Conventional Example 1 shown in FIG. 2A, in the cushion hopper 2 adjusted to the F2 state before F1, which is the highest density of the conveying crush of the raw material, except for the melting of the raw material in the heating unit 11 and volume reduction, In addition, there is a risk of supply depopulation resulting in a bridge due to the weight of the raw material. Gas generated at the time of heating by the filler mixed with the raw material does not return to the feed side but enters the mold, and abnormal molding occurs in the main cylinder 8a in the molding example of the high temperature resin raw material. In the second conventional example shown in FIG. 2B, the possibility that the supply cylinder 6 and the shutter after the hopper 9c are bridged from the first conventional example is mitigated by the presence of the intermediate space FS under the hopper shutter. The friction between raw material particles and the weight of the raw material cause deposition, and the deposited F2 state is unavoidable due to the structure.
Compared with the conventional example 1 and the conventional example 2 that cause the deposition, in the conventional example 3 shown in FIG. 5C, by adjusting the rotation operation of the feed screw 5, a raw material pool is generated at the receiving port 4d of the main unit 7. It is easy to perform no operation. Therefore, due to the pushing effect of the rotation operation of the main screw 8a in the main unit 7, the raw material density is changed from the (rough) F4 state to the F1 state through the F3 state in which the raw material density changes from F4 to F2 (rough → dense). It became possible to increase the density of the palm to the maximum. However, even if the rotation operation of the feeder is controlled, the phenomenon that the original fracture increases when the raw material becomes large cannot be suppressed, and abnormal wear of the feed screw also newly occurs. In the cushion hopper 2, a hopper shutter (not shown) divides the inside of the tank up and down and a paddle type level meter is arranged in the lower tank so that the rotation of the raw material can be reduced even if the F1 state occurs. Therefore, a gap is formed in the feed cylinder sleeve 3d.
[0005]
Generally, in order to eliminate the desorption component of the heating raw material generated from the inside of the main body device 7 outside the machine, and to carry it out of the molding equipment from the feeder or hopper auxiliary device, the exhaust and degassing shown in FIG. 6 and FIG. A piping system is provided, the molding machine and the entire attached equipment are organically arranged to form a single system unit, and the value of the configuration and the value of the product obtained in the final process of the molding machine That is, the initial cost, power cost, product defect rate, cleaning cycle, and repair cycle data are determined.
In the conventional example 2 shown in FIG. 6, the batch type control by the operation of the shutter 9a before the hopper and the shutter 9c after the hopper is intermittently almost quantified by the driving air source system by the blower 12, and the piping system for supplying the raw material and the degassing The system apparatus which attaches 2nd piping system of the vacuum suction pipe 2C of this is comprised.
In Conventional Example 3 shown in FIG. 7A, one system of a piping system that semi-circulates between the suction type pneumatic transport device 9 and the cushion hopper 2 is provided to constitute a system device. (Document 2: Nissui Chemicals Co., Ltd. General Product Guide “System Transport Type LK”, pp2, catalog 9510-3000). The negative pressure generated by the suction type pneumatic transport device 9 in the conventional example 3 becomes the raw material conveying force, and this system piping makes the initial cost of the entire equipment, the maintenance work, and the running cost cost lower than the system device of the conventional example 2. . That is, in Conventional Example 3, the horizontal feeder 10 configured in accordance with the starvation supply method and the system apparatus have an organic insufficiency in favor of operating the molding process satisfactorily.
[0006]
[Problems to be solved by the invention]
For the good molding process operation of the main body of the molding machine that manufactures non-defective products, the role played by the incidental equipment is important. In the conventional example 2, the narrow space formed between the molding machine and the supply cylinder 6 is almost hermetically sealed by the shutter 9c after the hopper, and the concentrated concentration distribution of the generated gas tends to stay inside the main body, and the conveyance cassette at the lower part of the supply cylinder 6 In the F1 state where the density is high, the adjacent raw materials rub against each other due to the weight of the raw material. As a result, the raw material is finely granulated, and the fine raw material stays at the bottom of the heating unit 11, causing “burning” of the molded product. Become.
As for Conventional Example 3, as shown in FIG. 8C, as a result of observing the feed port 4c of the horizontal feeder 10, the material supply is performed from the lower part of the discharge side end of the feed screw 5 in the F3 state. In addition, it was observed that the raw material supply from the upper part of the end portion occurred irregularly in the F4 state. Due to this irregular phenomenon, it has been found that the quantitative control operation of the conventional example 3 is inaccurate, and that the degassing effect that is drawn from the supply cylinder 6 to the cushion hopper 2 and sucked into the exhaust pipe 2B is insufficient. .
The present invention relates to the above-described problem relating to a quantitative feeder and its feeder installation system device as a manufacturing means for manufacturing a molded product by performing a melting operation using raw materials including granules and pellets and receiving the molten material in a mold. In view of this point, a quantitative feeder device that was developed as an improvement means, improved to a raw material quantitative feeder mechanism that is optimal for operation by the starvation supply method, and can supply the raw material quantified from the feeder to the supply cylinder. In addition to determining the structure, a gas suction means that is effective and economical is newly installed, and the feed operation that can create an improved raw material environment can be performed inside the main body of the molding machine by accurately quantifying the raw material supply. The object is to provide a molding machine manufacturing technique.
[0007]
[Means for Solving the Problems]
The metering feeder according to the present invention comprises a raw material hopper, a material feed pipe, a cushion hopper, an exhaust pipe, and a suction type air transport device which are connected in sequence, and an upward feed type tilt type quantitative feeder mechanism and a molding machine main body at the lower part of the cushion hopper In the feeder mechanism, a gap larger than the raw material is set between the feed cylinder sleeve and the feed screw blade in the feeder mechanism, and the supply cylinder is suspended from the upward tip where the raw material is transferred by the variable speed rotation operation of the feed cylinder sleeve. In the fixed-quantity feeder mechanism to be installed, the inclination angle (θ) for installing the feeder mechanism (3) is configured to be an angle before and after the repose angle indicated by the raw material (M), and the feed cylinder sleeve (3d) and the feed screw in the mechanism blade (5a, 5b) during feed Siri by gaps (S) corresponding to the size of the raw material (M) to permit change of The sleeve (3d) is formed or, in addition, the supply tube (6) is provided with a transparent portion (6a) made of a coin glass tube so that the supply state of the raw material (M) can be confirmed. .
[0008]
And the system device with a quantitative feeder mechanism according to the present invention is a system device with a quantitative feeder mechanism to which a quantitative feeder mechanism is attached , and is directly connected to an exhaust pipe that connects a gas vent port with a supply cylinder to a suction type air transport device . The connecting pipe is configured so that the gas generated inside the main body of the molding machine can be always forcedly sucked and held through the suction operation of the air inside the supply cylinder .
[0009]
[Action]
The quantitative feeder mechanism 3 of the present invention configured as described above is configured such that the feed screw is inclined so that the raw material received from the cushion hopper is fed around the upper side of the feed screw so as not to cause an error. conveyed, corresponding to the gap size between the degree of inclination determines the installation angle of inclination of the feed device for conveying upward relative to the angle of repose of the material Rutotomoni degree feed screw blades and the feed cylinder sleeve of the tilt angle because apart widely decided to, without destroying the appearance form of raw materials at the time of the raw material supply, it does not occur consolidation phenomenon caused by the raw materials to its own weight at the time of supply. In addition, since the supply tube is provided with a transparent part so that the supply state of the raw material can be confirmed , a quantified rotary feed operation that does not cause a variation supply phenomenon from the upper side of the feed port can be performed visually , and an error in measurement management can be obtained. Diminished. In addition, the occurrence of wear caused by the transfer of raw materials generated in each part of the mechanical device was drastically reduced, the output of the motor used was reduced, and the feed device itself could be made smaller and lighter synergistically. Further, the gas vent provided in the upper part of the supply cylinder can be clearly separated from the dry exhaust flow in the cushion hopper, so that the gas movement of the main body generated gas to the cushion hopper is eliminated. And since the device inclination angle of the quantitative feed mechanism is determined according to the physical properties of the repose angle of the raw material, the tendency of the transferred raw material to flow back to the lower side of the feed mechanism can be prevented, and the material does not accumulate at the bottom or middle of the mechanism, and therefore the raw material damage There is no cause of increase in the drive output of the sleeve rotation, such as a measurement error or upper space blockage due to the raw material flowing around from the upper space of the feed screw.
Similarly, the system device 1 with a quantification mechanism uses a forced suction exhaust type in which the supply cylinder gas vent is directly connected to the exhaust pipe, and an exhaust method in which the cushion hopper does not pass. When the air resistance at the time is minimum, it is easy to vent the gas, and further, fine particles, powder, etc. are drastically reduced in the feedstock, so the resin melt state improves in the main unit, and when the resin produced by the main unit is molded However, defects such as deposits that have been generated in the mold in the past have been reduced. Further, the system device 1 of the present invention forcibly sucks the suction-type pneumatic transport device used for the raw material supply also as the degassing / exhaust of the main body device, so that no special suction means is required.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a quantitative feeder mechanism and a system device with the mechanism according to the present invention will be described with reference to the drawings. Here, FIG. 1 illustrates a quantitative feeder mechanism of the present invention, a partial side view including a side cross section showing the configuration thereof, and FIG. 2 illustrates a system apparatus with a quantitative feeder mechanism of the present invention. FIG. 3 is a side view showing the system configuration, FIG. 3 explains an embodiment of the quantitative feeder mechanism of the present invention, (A) is a partial sectional side view showing one embodiment, and (B) is another embodiment. FIG. 4 is a partial side sectional view showing the features of the quantitative feeder mechanism of the present invention, (A) is a schematic diagram showing a raw material conveyance state, and (B) is a portion showing an internal structure of the raw material conveyance. It is a sectional side view.
[0011]
As shown in FIG. 1, the quantitative feeder mechanism 3 of the present invention is inclined upward from the position of the raw material dropping port 4b at the lower part of the cushion hopper 2 in the direction of the feed port 4c, and the inclination angle θ is around the repose angle of the physical properties of the raw material. It is selected and connected to a supply cylinder 6 standing at a receiving port 4d of a main body device 7 of the molding machine. The feedstock 5 is rotated by a power drive of the feeder 3 with a speed reduction mechanism capable of variable speed, and the raw material transported upwardly from the cushion hopper 2 to the main body device 7 can be supplied. The gap S2 between the cutting edge of the feed screw blade 5a wound around the feed screw 5 and the feed cylinder sleeve 3d is formed sufficiently wider than the raw material size, and a gas vent 2b is provided at the top of the supply cylinder 6. ing.
[0012]
Further, as shown in FIG. 2, the system device 1 with a quantitative feeder mechanism of the present invention is assembled in the order of a cushion hopper 2, a quantitative feeder mechanism 3, and a supply cylinder 6, and the supply cylinder standing on the upper side of the main body device 7 of the molding machine. A gas vent 2b attached to the top is provided so as to be naturally ventilated, or connected to the exhaust pipe 2B for forced suction exhaust so that it can communicate with the main unit 7. As shown in FIG. 4B, a gap S2 between the feed cylinder sleeve 3d inner diameter D and the feed screw blade 5a outer diameter d formed over part or all of the feed structure is formed by the raw material M. Whether it is in the form of pellets, tablets, or granules, it is necessary that the raw material be sufficiently larger than the largest form.
[0013]
【Example】
An embodiment of the quantitative feeder mechanism 3 of the present invention will be described with reference to FIGS. Used as a pellet-shaped forming raw material, the

quantitative feed mechanism

3 has an installation inclination angle θ = π / 6 which is substantially the same as the angle of repose of the pellet resin, and is sufficiently wider than the size of the pellet M used, and the cutting edge of the feed screw blade 5a A gap S2 = 6 mm between the feed cylinder sleeves 3d was set. The upper cylinder of the supply cylinder 6 is provided with a gas vent 2b, and a transparent part 6a made of a hard glass tube is provided in the middle of the supply cylinder by four columns that are fixed between the upper cylinder and the supply cylinder mounting part 6b. Tightened from outside and assembled in a sealed manner. Here, the feed screw 5 was made of a nitride material, and the feed cylinder sleeve was made of SUS440CHRC45. Reference numeral 3b is a controller for a quantitative feeder drive source servo motor , which is indispensable for supplying raw materials strictly when molding precision parts. 4a is a raw material supply port, 2a is a cushion hopper exhaust port, and H is a supply cylinder 6. The height of the lower part of the upper body was 20 cm. As shown in FIG. 3, the gap S is made narrower than the raw material size to S1, the gap S2 (> S1) is made sufficiently wider than the raw material size , and both the gaps (S1, S2) are provided. Therefore, the feed screw 5 made of a mixture of the feed screw blades 5a and / or 5b may be formed. The fixed amount feed mechanism 3 shown in FIG. 1A is formed with a feed screw blade portion facing a feed port of a supply cylinder (not shown) approximately one round wide to form a gap S1 smaller than the pellet size, The gap S2 in the other section is formed sufficiently wider than the pellet size, and is performed when the installation inclination angle θ is smaller than the pellet repose angle. Also, the one shown in FIG. 2B is the other blade part including the feed port side feed screw blades 5a and 5b ( not shown) of the supply cylinder 6 after forming the same sufficiently wide gap S2 in advance. relative, and set book adds a blade cover so as to narrow the gap S, or pre-wound to approximately one rotation, so as to form said blade tip in narrow gaps S1, these treatments pellets feed This is to cope with problems caused by insufficient inclination of the installation inclination angle θ , such as intermittent drops from the upper gap of the opening 4c. To do.
[0014]
An embodiment in which the above-described embodiment of the quantitative feeder mechanism is incorporated and the system apparatus with the quantitative feeder mechanism of the present invention is configured will be described with reference to FIG. In the present embodiment, the gas vent 2b attached to the top of the supply cylinder 6 of the quantitative feeder mechanism 3 is connected to the exhaust pipe 2B for forced suction exhaust. And in normal test operation for about one year, the material used in pellet form is 46 nylon resin as the main material, and 30% of the total is added with glass fiber added and contained in the additive mixture ratio. went. Table 1 shows a comparison of the present example and the above-described conventional examples 1 to 3 as Comparative Examples 1 to 3, respectively. In this table, each system apparatus indicates an application diagram by a symbol in the attached drawing number or designated drawing number.
[0015]
[Table 1]

[0016]
In the embodiment of the system apparatus of the present invention, in addition to those shown in Table 1, the pellets were in good frictional contact with each other inside the feeder due to the rotation of the feed screw 5 and were in a good weighing state throughout. As shown in FIG. 4 (A), when the raw material storage state inside the cushion hopper 2 is adjusted to the F2 state where no accumulation occurs, the state of the pellets inside the quantitative feeder mechanism 3 is a feed not described here. Holding in the F3 state in the process of changing (rough → dense) by rotating the screw, it is fed upward, and the pellet-like raw material instantaneously reaches the supply cylinder 6 and enters the F4 state where the raw material density is (coarse) Fall down. After falling to the main body device 7, the volume movement speed constant state is maintained, and the same conveying state as the pellets in the main body device in the conventional example 3 is shown. In other words, in the valley portion of the main blade 8b near the main body device 7 receiving port 4d immediately below the supply cylinder 6, pellets were not deposited and a good space was recognized. Therefore, in the pellet run-up section immediately before the heating unit 11, good gas component separation from the heating raw material occurred.
When the discharge port of the quantitative feed mechanism 3 was intentionally closed, the feed screw 5 was idled into the packed pellets. The idling operation does not proceed with the compaction of the pellet, the overload state of the motor does not go into danger, the slight failure of the pellet has occurred, and the range of occurrence of the failure is narrow, and the feed device components No traces of wear were observed. In other examples except the comparative example 2 cited in the literature, the operation was performed until the repair was necessary, and the operation was stopped within 12 months even if the repair was not necessary, and the operation data was obtained.
[0017]
By implementing the present invention configured as described above, a sufficient removal component removal effect was obtained, and in molding of a thin ABS resin pellet, a short mold was generated in Comparative Example 3 at 50 PPM. 0 PPM. Furthermore, when aluminum hydroxide is added to the dispersant and the mixed pellets are molded at a high temperature, the water vapor component generated by decomposition of the dispersant is degassed and removed, or the residual water is vaporized when using an elastomer resin. Effective out-of-flight exhaust was achieved.
Examples of suitable implementations of the present invention include, for example, 4-6 pieces per mold, precision part molding of small parts weighing about 15 g per shot, and food processing using thermoplastic fixing raw materials other than plastic products. And can be applied to pharmaceutical preparations.
[0018]
【The invention's effect】
Of the present invention, according with its mechanism-equipped system apparatus quantitative feeder mechanism, quantitative feeder was the inclined arrangement of the feeder mechanism to allow upward conveyance based on the raw material properties, the raw material size of the design requirements of the mechanism within the gap formed constitute a mechanism 3, the piping system 2A of the system unit 1 to attached the quantitative feeder mechanism, 2B, and organically organize 2b, and the minimum amount of the molding machine in the main screw 8a can carry, in accordance with the so-called starvation feeding method Optimized system to supply the best molding resin by quantitatively supplying the conditions to make it possible to implement by improving the quantitative feeder mechanism. As a result, the

quantitative

feed device

3 has been reduced in size and energy saving, and the quantitative supply has been remarkably stabilized. In addition, the cost effectiveness of the initial cost of the system device 1 has increased, and similar devices have fallen within a price range that is more prevalent . Moreover, the quality of molded products to which the present invention device 1 is manufactured is reduced defective occurrence rate is improved, maintenance and repair costs, including mold cleaning and feed screw replacement is a fraction less than one, such as the The inventive technique realizes a very stable operation and contributes widely to the general improvement of molding manufacturing technology.
[Brief description of the drawings]
FIG. 1 is a partial side view illustrating a configuration of a quantitative feeder mechanism according to the present invention, including a side cross section showing a configuration thereof.
FIG. 2 is a side view illustrating the system configuration of the system device with a quantitative feeder mechanism according to the present invention.
3A and 3B are diagrams for explaining an embodiment of a quantitative feeder mechanism of the present invention, in which FIG. 3A is a partial side sectional view showing one embodiment, and FIG. 3B is a partial side sectional view showing another embodiment. .
4A and 4B are diagrams for explaining the features of the quantitative feeder mechanism of the present invention, in which FIG. 4A is a schematic view showing a raw material transfer state, and FIG. 4B is a partial side sectional view showing an internal structure of the raw material transfer. It is.
FIG. 5 is a partial side cross-sectional view illustrating a conventional example 1 (a hopper direct-coupled molding machine) for explaining a related art related to a feeder mechanism.
FIG. 6 is a partial side cross-sectional view illustrating a conventional example 2 (system device with a shutter opening / closing type feeder) for explaining a related art related to the system device.
7A and 7B are diagrams for explaining another conventional technique related to a system apparatus and its attached feeder mechanism, in which FIG. 7A is a side view showing a conventional example 3 (system apparatus with a horizontal type quantitative feeder), and FIG. It is a fragmentary sectional side view which shows a feeder (horizontal installation type | mold fixed feeder).
FIGS. 8A and 8B are diagrams for explaining a raw material conveyance state of a feeder mechanism in the prior art, in which FIG. 8A is a schematic diagram illustrating a state of Conventional Example 1, FIG. 8B is a schematic diagram illustrating a state of Conventional Example 2; C) is a schematic diagram showing the state of Conventional Example 3.
[Explanation of symbols]
1 System device 2 Cushion hopper 2a Exhaust port 2b Degassing port 2A Raw material supply tube 2B Exhaust tube 2C Vacuum suction tube 2D Signal line 3 Feeder 3a Servo motor 3b Controller (for servo motor)
3c Feed cylinder 3d Feed cylinder sleeve 4 Raw material hopper 4a Raw material supply port 4b Raw material drop port 4c Feed port 4d Receiving port 5 Feed screw 5a, 5b Feed screw blade (or envelope)
6 Supply tube 6a Transparent portion 6b Supply tube mounting portion 7 Main unit (extruder / injection molding machine)
7a Main cylinder 7b Main cylinder sleeve 8 Reducer (for main unit)
8a Main screw 8b Main screw blade (or envelope)
9 Suction-type pneumatic transport device 9a Shutter before hopper 9b Shutter inside hopper 9c Shutter after hopper 10 Horizontal feeder 11 Heating unit 12 Blower 13 Sensor 14 Controller 15 Vacuum pump D Sleeve inner diameter d Screw blade outer diameter F1 Material feed bulk density state F1 (Dense)>F2>F3> F4 (Coarse)
F2 State before F1 state F3 State of changing process of F4 → F2 (coarse → fine) F4 State of raw material density (coarse) FS Intermediate space under hopper shutter H Height including transparent cylinder θ Feeder installation inclination Angle S Clearance between cylinder sleeve and screw blade, (D−d) / 2
S0 Gap in the same part (main unit)
S1 Same as above, narrower than the size of the raw material (feeder)
S2 Same as above, gap larger than raw material size (feeder)

Claims

A raw material source hopper, a raw material supply pipe, a cushion hopper, an exhaust pipe, and a suction type pneumatic transport device are connected in order, and an upward supply type inclined quantitative feeder mechanism and a molding machine main body device are provided below the cushion hopper. In the feeder mechanism, a gap larger than the raw material is set between the feed cylinder sleeve and the feed screw blade, and the feeder cylinder is suspended from the upward tip to transfer the raw material by the variable speed rotation operation of the feed cylinder sleeve. The inclination angle (θ) for installing the mechanism (3) is configured to be an angle before and after the repose angle indicated by the raw material (M), and between the feed cylinder sleeve (3d) and the feed screw blades (5a, 5b) in the mechanism. and gaps (S) corresponding to the size of the raw material (M) to form a feed cylinder sleeve (3d) to allow change Or in addition quantitative feeder mechanism, characterized in that to enable check the supply state of the transparent portion made of coins glass tube to the supply tube (6) (6a) the provided material (M) and.

A system device with a quantitative feeder mechanism to which the quantitative feeder mechanism according to claim 1 is attached, wherein an exhaust pipe (2B) for connecting a gas vent (2b) attached to a supply cylinder (6) to a suction-type pneumatic transport device (9) The system with a quantitative feeder mechanism is configured so that the gas generated in the molding machine main body device (7) can always be held in a forced suction state through a piping connection directly to the supply cylinder) apparatus.