JP4365985B2

JP4365985B2 - Clamping device for hollow molding machine

Info

Publication number: JP4365985B2
Application number: JP2000122322A
Authority: JP
Inventors: 高明加藤
Original assignee: Japan Steel Works Ltd
Current assignee: Japan Steel Works Ltd
Priority date: 2000-04-24
Filing date: 2000-04-24
Publication date: 2009-11-18
Anticipated expiration: 2020-04-24
Also published as: JP2001301013A

Description

【０００１】
【発明の属する技術分野】
本発明は、ロッキング機構を備える中空成形機の型締装置に関するものである。
【０００２】
【従来の技術及びその課題】
この種の中空成形機の型締装置は、クランプによってフックを挟み、ロッキングバーによって２つ割りの金型の上部を開かないように固定するものであり、従来、特公昭６０−１７６９４号、実開昭６１−９５５０９号等に記載されるものが知られている。ロッキング機構を備えさせ、対をなす金型の上部にロッド（タイバー）を設けることを省略する理由は、一連の成形動作に伴って金型及び型締装置が移動するとき、パリソン又は成形品がロッドと干渉することを避けるところにあり、上部のロッドの省略に伴ってバリの喰切りが悪化することを防止するために、ロッキング機構によって２つ割りの金型の上部を開かないように固定している。
【０００３】
この種の中空成形機の型締装置では、クランプ、フック等に摩耗が生じたとき、この摩耗した寸法だけ成形時の内圧を受ける金型が開き、成形品にバリを生ずるなどの不良がでる。この摩耗量に応じた補正を行なうために、ロッキングバーの一方の端に設けた調節ナットを回転させて有効長さを調節するようにしている。しかしながら、この調整は面倒かつ手間がかかるという課題を有している。
【０００４】
実開昭６１−９５５０９号に記載される中空成形機の型締装置は、この課題を解決するロッキング機構を提案するものであり、ロッキングバーに油圧又は空気圧のシリンダ装置を設け、摩耗分を自動的に補正し、金型を固定し、開き防止を行なうものである。
【０００５】
しかしながら、この従来のロッキング機構にあっては、ロッキングバーを２分割し、一対のロッキングバーの間にシリンダ装置を設けると共に、シリンダ装置をシリンダ支持体に支持させる構造である。しかも、シリンダ装置は、シリンダ支持体に摺動自在に支持させる必要がある。このように、ロッキングバーを２分割しているので構造が複雑になる。また、シリンダ装置を一対のロッキングバーの間に設けるので、シリンダ装置を摺動自在に支持させなければならず、構造が複雑になるという技術的課題を有している。更に、ロッキングバーを後側の型取付板とリアプレートとの間に架設してあるので、シリンダ装置による引き力がリアプレートを介して型締機構に型開き力として作用することになり、これに打ち勝つために型締機構の大容量化・大形化を惹起する。
【０００６】
また、空気圧のシリンダ装置では所定の引き力が確保し難いため、油圧のシリンダ装置にならざるを得ない。加えて、シリンダ装置では、所定の型締め力を維持するために、常に駆動しなければならない。従って、消費エネルギー及び駆動に伴う騒音が大きく、シリンダ装置及び配管から油漏れを生じた場合、油及びオイルミストにより成形品のみならず環境を汚染する。このため、消耗部品の交換、メンテナンスが頻繁に必要になるのみならず、清浄な作業が求められる例えばクリーンルームに設置することが事実上できない。加えて、作動油は温度により粘度が変化するので、作動の確実性及び安定性に欠け、作動誤差を生じて精緻な制御が困難である。
【０００７】
【課題を解決するための手段】
本発明は、このような従来の技術的課題に鑑みてなされたものであり、その構成は次の通りである。
請求項１の発明は、ロッド８０と、ロッド８０に取付ける前側の型取付板７０及び金型６０と、ロッド８０に取付けるリアプレート７１と、ロッド８０に摺動自在に支持される後側の型取付板７２及び金型６１と、後側の型取付板７２とリアプレート７１との間隔を拡大及び縮小させて、対をなす金型６０，６１の型閉じ及び型開きを行なう型締機構６２と、一方の前記型取付板７０，７２に取付けるフック２と、他方の前記型取付板７２，７０に取付けられ、クランプ開閉機構３３，３４，３ａ，４ａによって開閉されるクランプ３，４と、他方の型取付板７２，７０及びリアプレート７１のいずれかに、固定して設ける駆動装置５及び支点７７によって揺動自在に支持されるレバー７８とを備えさせ、前記駆動装置５によってレバー７８の第１作動部７８ａを動作させ、レバー７８の第２作動部７８ｂによってクランプ開閉機構３３，３４，３ａ，４ａを動作させてクランプ３，４を閉じさせ、クランプ３，４によるフック２の係合把持を行なうと共に、フック２を係合把持したクランプ３，４をレバー７８の第２作動部７８ｂによって引動させ、所定の型締め力を生じさせるようにした中空成形機の型締装置において、前記クランプ３，４が、固定用ブロック３０に揺動自在にピン結合されると共に、駆動装置５が、他方の型取付板７２，７０及びリアプレート７１のいずれかに固設されるサポート４１，５４と、サポート４１，５４に固設される電動機５２と、電動機５２によって回転駆動されるねじ部材５１と、ねじ部材５１に非可逆ねじ結合するナット部材４２とを有し、前記金型６０，６１の型開きのときには、電動機５２によってねじ部材５１を回転駆動させ、ナット部材４２の移動によってレバー７８の第１作動部７８ａ及び第２作動部７８ｂを動作させて固定用ブロック３０を移動させ、クランプ３，４がクランプ開閉機構３３，３４，３ａ，４ａの動作によって開かれてフック２の係合把持が解放され、前記金型６０，６１の型閉じのときには、電動機５２によってねじ部材５１を逆回転駆動させ、ナット部材４２の移動によってレバー７８の第１作動部７８ａ及び第２作動部７８ｂを動作させて固定用ブロック３０を引動させ、クランプ３，４がクランプ開閉機構３３，３４，３ａ，４ａの動作によって閉じられてフック２が係合把持されることを特徴とする中空成形機の型締装置である。
請求項２の発明は、ロッド８０と、ロッド８０に取付ける前側の型取付板７０及び金型６０と、ロッド８０に取付けるリアプレート７１と、ロッド８０に摺動自在に支持される後側の型取付板７２及び金型６１と、後側の型取付板７２とリアプレート７１との間隔を拡大及び縮小させて、対をなす金型６０，６１の型閉じ及び型開きを行なう型締機構６２とを備える中空成形機の型締装置において、前側の型取付板７０に取付けるフック２と、後側の型取付板７２に取付けるクランプ３，４と、リアプレート７１に固設する駆動装置５と、リアプレート７１に支点７７によって揺動自在に支持されるレバー７８とを備えさせ、クランプ３，４が、固定用ブロック３０に揺動自在にピン結合され、該固定用ブロック３０にロッキングバー６が連結され、駆動装置５によって第１作動部７８ａを動作させてレバー７８を揺動させ、レバー７８の第２作動部７８ｂによってロッキングバー６及び固定用ブロック３０を移動させると共に、駆動装置５が、リアプレート７１に固設されるサポート４１，５４と、サポート４１，５４に固設される電動機５２と、電動機５２によって回転駆動されるねじ部材５１と、ねじ部材５１に非可逆ねじ結合するナット部材４２とを有し、前記金型６０，６１の型開きのときには、弾性体３６によって付勢される固定用ブロック３０及びロッキングバー６が前進移動し、クランプ開閉機構３３，３４，３ａ，４ａの動作によってクランプ３，４が開かれてフック２の係合把持が解放され、かつ、ナット部材４２がレバー７８の第１作動部７８ａとの係合を解除して、レバー７８の第２作動部７８ｂとロッキングバー６との係止が解除されており、前記金型６０，６１の型閉じのときには、駆動装置５の動作によってナット部材４２がレバー７８の第１作動部７８ａと係合してレバー７８が揺動し、レバー７８の第２作動部７８ｂがロッキングバー６に係止し、かつ、前記弾性体３６が圧縮されながらロッキングバー６及び固定用ブロック３０が後退移動し、クランプ開閉機構３３，３４，３ａ，４ａの動作によってクランプ３，４が閉じられてフック２が係合把持されると共に、フック２を係合把持したクランプ３，４を引動させ、所定の型締め力を生じさせることを特徴とする中空成形機の型締装置である。
請求項３の発明は、ナット部材４２とレバー７８の第１作動部７８ａとの相対位置を調節するために、所定厚さのスペーサ５８を設けることを特徴とする請求項２の中空成形機の型締装置である。
請求項４の発明は、ねじ部材５１が、サポート４１，５４に設けるスラストベアリング５３によって回転自在に支持されることを特徴とする請求項１，２又は３の中空成形機の型締装置である。
請求項５の発明は、レバー７８の第１作動部７８ａ及び第２作動部７８ｂに、それぞれ球面座金４６，４７が設けられ、レバー７８の第１作動部７８ａと係合するナット部材４２の被係合部４６，４８及びレバー７８の第２作動部７８ｂと係合して固定用ブロック３０を移動させるための被係合部４７，６８を形成していることを特徴とする請求項１，２，３又は４の中空成形機の型締装置である。
請求項６の発明は、ナット部材４２の回止め手段４１ａが設けられ、ナット部材４２の前後動のみが可能であることを特徴とする請求項１，２，３，４又は５の中空成形機の型締装置である。
【０００８】
【発明の実施の形態】
以下、本発明の１実施の形態について、図１〜図６を参照して説明する。先ず、ロッキング機構１を備える中空成形機の型締装置の概略について、図５，図６を参照して説明する。図中において符号８０は、通常平行配置されるロッド（タイバー）であり、フレーム８１（移送台）に摺動自在に設けられている。ロッド８０の一端部には、前側の型取付板７０の下部が固着され、ロッド８０の他端部には、リアプレート７１の下部が固着され、ロッド８０の中間部には、後側の型取付板７２の下部が摺動自在に支持されている。
【０００９】
この一対の型取付板７０，７２の対向面には、分割された金型６０，６１がそれぞれ取付けられている。また、後側の型取付板７２とリアプレート７１との間には、後側の型取付板７２とリアプレート７１との間隔を拡大及び縮小させて、金型６０，６１の型閉じ（型締めを含む）及び型開きを行なう型締機構６２が配設されている。この型締機構６２は、トグル機構を構成する第１リンク６３及び第２リンク６４を有するリンク装置によって構成されている。第１リンク６３は、前端がクレビス６５を介して後側の型取付板７２にピン結合されて揺動自在であり、後端がガイドブロック６６にピン結合されて揺動自在である。第２リンク６４は、前端がガイドブロック６６にピン結合されて揺動自在であり、後端がクレビス６７を介してリアプレート７１にピン結合されて揺動自在である。
【００１０】
ガイドブロック６６は、図５に示すガイドブロック駆動機構９０によって図５上で上下方向（左右方向）に駆動される。ガイドブロック駆動機構９０は、フレーム８１に回転自在に支持したボールねじ９１と、フレーム８１に取付けたトグル用電動機９３と、トグル用電動機９３の回転軸とボールねじ９１とを接続するカップリング９２と、ガイドブロック６６に固着され、ボールねじ９１と螺合するボールナット９４とを有する。
【００１１】
トグル用電動機９３によってカップリング９２を介してボールねじ９１を正逆に回転させれば、ボールナット９４及びガイドブロック６６が図５上で上下に駆動されるので、一対のリンク６３，６４が屈曲状態と直線状態とを採る。一対のリンク６３，６４が直線状に延びることにより、後側の型取付板７２及び金型６１が、ロッド８０に案内されつつ前方向（矢印Ａ方向）に移動し、また、リアプレート７１、ロッド８０、前側の型取付板７０及び金型６０が後方向（反矢印Ａ方向）に移動するので、一対の金型６０，６１が型閉じする。一方、リンク６３，６４を屈曲変形させることにより、逆に、金型６０，６１が型開きする。なお、型締機構６２及びガイドブロック駆動機構９０は、シリンダ装置等によって構成することも可能である。
【００１２】
そして、前側の型取付板７０、後側の型取付板７２及びリアプレート７１の上部に位置させて、少なくとも１組のロッキング機構１を設ける。ロッキング機構１は、金型６０の側方であって、前側の型取付板７０に取付けるフック２と、金型６１の側方であって、後側の型取付板７２に取付けるクランプ３，４と、リアプレート７１に取付ける駆動装置５と、リアプレート７１に揺動自在に支持されるレバー７８と、駆動装置５の駆動力をクランプ３，４に伝達するロッキングバー６とを有している。なお、ロッキングバー６は、図２では一部が省略されている。
【００１３】
フック２は、図１に示すように前側の型取付板７０にねじ２４によって固着するナット状の位置決め部材２０と、位置決め部材２０の雌ねじ部に螺合する雄ねじ部を前端部に有し、後端に拡大するフック部２１ａを有するフック本体２１と、型取付板７０に対するフック本体２１の回止めを図るキー２２とを有する。しかして、ねじ２４を取外した状態で、フランジ部が型取付板７０に係止する位置決め部材２０を正又は逆に回転させることにより、フック本体２１がキー２２によって案内されながら螺入又は螺出するので、フック部２１ａの突出長さを増減調節することができる。なお、フック２は、通常、フック部２１ａが金型６０よりも後方に若干突出する位置を採る。
【００１４】
クランプ３，４は、図上で上下対称に作動するように設けられている。すなわち、各クランプ３，４は、固定用ブロック３０にそれぞれピン３１，３２によって揺動自在に軸支され、固定用ブロック３０は、後側の型取付板７２にねじ３７によって固着する案内部材３８に案内されて前後に摺動自在である。また、クランプ３，４には、クランプ開閉機構が付属される。このクランプ開閉機構は、案内部材３８の前方への延長部に固設した案内ピン３３，３４と、クランプ３，４に形成され、各案内ピン３３，３４に係合する長孔３ａ，４ａとで構成されている。クランプ３，４は、固定用ブロック３０が前後に移動することにより、案内ピン３３，３４によって案内されながらピン３１，３２の回りに回動し、鉤状の先端部が前後動を伴いながら開閉する。
【００１５】
ロッキングバー６は、中間の大径部と前後の小径部とを有して一体をなし、後側の型取付板７２を貫通する小径前端部が固定用ブロック３０に連結（螺着）され、リアプレート７１にまで延びる後端部が駆動装置５及びレバー７８によって駆動されるようになっている。ロッキングバー６の大径部前端は、後側の型取付板７２に固設する筒状のスライドブッシュガイド３５によって摺動案内され、小径前端部に巻装させて後側の型取付板７２の貫通孔に内挿させたコイルスプリングからなる弾性体３６が、固定用ブロック３０及びロッキングバー６を前方に付勢している。弾性体３６は、後端がスライドブッシュガイド３５の前面に当接し、前端が常時、固定用ブロック３０の後面を弾性的に押圧している。なお、弾性体３６によって付勢される固定用ブロック３０の前方移動位置を規制するために、ストッパを形成することができる。
【００１６】
駆動装置５は、型締機構６２との干渉を避けて配置され、リアプレート７１の前面に図１に示すねじ４０によって固定される取付板４１ｂと一体をなすサポート部材４１と、サポート部材４１の内部に収容され、駆動機構５０によって前後に駆動されるナット部材４２とを有する。ナット部材４２は、図３に示すように雌ねじ部４３を有すると共に、軸部４４を一体に有し、軸部４４の先端がねじ部４５を形成している。ナット部材４２は、その一部（突出部）がサポート部材４１の案内部４１ａに摺動自在に係合し、前後動のみが可能で回転が拘束されている。このサポート部材４１の案内部４１ａは、ナット部材４２の回止め手段を構成している。
【００１７】
レバー７８は、リアプレート７１に固着するブロック７９にピンからなる支点７７によって揺動自在に支持され、左右方向に延びている。図４に示すようにレバー７８の一端の二股をなす第１作動部７８ａはナット部材４２に係合し、他端の二股をなす第２作動部７８ｂはロッキングバー６の後端部に係合し、ナット部材４２の前方移動による引き力がレバー７８によって反転され、ロッキングバー６の後方への引き力に変換されるようになつている。
【００１８】
すなわち、レバー７８の第１作動部７８ａはナット部材４２に球面座金４６を介して当接係合が可能であり、設定ナット４８がナット部材４２のねじ部４５に螺合し、設定ナット４８の前側球面に球面座金４６が面接触する。これにより、レバー７８の第１作動部７８ａは、ナット部材４２の軸部４４と面接触を維持しながら相対傾動が可能である。球面座金４６及び設定ナット４８は、レバー７８の第１作動部７８ａが係合するナット部材４２の被係合部を構成している。４９は、ロックナットである。
【００１９】
一方、レバー７８の第２作動部７８ｂはロッキングバー６の後端に球面座金４７を介して当接係合が可能であり、設定ナット６８がロッキングバー６の小径後端部の雄ねじに螺合し、設定ナット６８の前側球面に球面座金４７が面接触する。従って、レバー７８の第２作動部７８ｂは、ロッキングバー６と相対傾動が可能である。球面座金４７及び設定ナット６８は、レバー７８の第２作動部７８ｂが係合するロッキングバー６の被係合部を構成している。６９は、ロックナットである。なお、リアプレート７１には切欠部７１ａが形成され、ロッキングバー６の後端部の球面座金４７、設定ナット６８、ロックナット６９、レバー７８の第２作動部７８ｂ等がリアプレート７１と干渉しないようになっている。
【００２０】
駆動機構５０は、図３に示すようにねじ部材５１と、ねじ部材５１を正又は逆に回転駆動する駆動源５２とを有し、ねじ部材５１が前後方向の所定位置を保持するようにスラストベアリング５３を付属させてある。すなわち、サポート部材４１の前面にケース５４を固設し、ケース５４の前側に駆動源５２を固設すると共に、ケース５４の内部において、ねじ部材５１と一体の円板５１ａがスラストベアリング５３によって回転自在に支持されている。このねじ部材５１の前端部が、駆動源５２、具体的には電動機の回転軸に継手５５を介して連結されている。このサポート部材４１とケース５４とで、サポートを構成している。
【００２１】
ねじ部材５１は、ナット部材４２の雌ねじ部４３に非可逆ねじ結合している。ここで、非可逆ねじ結合とは、ねじ部材５１とナット部材４２との間に作用する引き力の作用によってはねじ部材５１及びナット部材４２のいずれもが回転しない結合状態にあることをいい、ねじ部材５１及びナット部材４２のピッチを適当に選定することで得られる。なお、ここでのねじ部材５１とナット部材４２とは螺合（非可逆ねじ結合）していればよく、ねじ部材５１には、雌ねじを刻設したものを含み、ナット部材４２には、雄ねじを刻設したものを含む。
【００２２】
次に、作用について説明する。対をなす金型６０，６１の型開きのときには、型締機構６２によって駆動されて後側の型取付板７２とリアプレート７１との間隔が縮小され、リアプレート７１、前側の型取付板７０及び金型６０が、ロッド８０がフレーム８１に対して摺動することで前方（矢印Ａ方向）へ移動する。また、後側の型取付板７２及び金型６１がロッド８０に摺動案内されながら後方（反矢印Ａ方向）へ移動する。
【００２３】
金型６０，６１の型閉じのときには、型締機構６２によって駆動されて後側の型取付板７２とリアプレート７１との間隔が拡大され、リアプレート７１、前側の型取付板７０及び金型６０が、ロッド８０がフレーム８１に対して摺動することで後方へ移動する。また、後側の型取付板７２及び金型６１がロッド８０に摺動案内されながら前方へ移動する。これにより、金型６０，６１の下部には所定の型締め力が得られる。
【００２４】
このような金型６０，６１の型閉じ及び型開き動作に合わせて、ロッキング機構１も作動させる。金型６０，６１の型閉じのときには、リアプレート７１の後方（反矢印Ａ方向）への移動及び後側の型取付板７２の前方（矢印Ａ方向）への移動に伴い、金型６０，６１が密着する型閉じ動作の開始と同時又は少し遅れて、レバー７８の第２作動部７８ｂがロッキングバー６の後端つまり球面座金４７及び設定ナット６８に係止してロッキングバー６が後方へ引かれる。これにより、弾性体３６が圧縮されながら固定用ブロック３０が後退移動し、クランプ開閉機構の機能によってクランプ３，４が閉じられてフック２が係合把持される。クランプ開閉機構は、前述したように案内ピン３３，３４と長孔３ａ，４ａとで構成される。
【００２５】
金型６０，６１の型閉じのときには、駆動装置５を作動させる。すなわち、金型６０，６１が密着する型閉じ動作の開始と同時又は少し遅れて、駆動機構５０によってナット部材４２を前方に駆動させ、レバー７８の第１作動部７８ａを球面座金４６及び設定ナット４８に係止させて前方に引き、レバー７８を支点７７の回りに揺動させる。このレバー７８の揺動により、レバー７８の第２作動部７８ｂがロッキングバー６の後端つまり球面座金４７に係止した状態でロッキングバー６が後方へ引かれる。これにより、固定用ブロック３０が強制的に後退移動させられるので、クランプ３，４、フック２等の摩耗に関わらず、クランプ開閉機構（３３，３４、３ａ，４ａ）の機能によってクランプ３，４が閉じられてフック２が確実に係合把持される。ナット部材４２は、サポート部材４１の案内部４１ａに係合するので、回転することなく前後動のみを行なう。
【００２６】
具体的には、駆動源５２により、継手５５を介してねじ部材５１を正方向に回転駆動すれば、スラストベアリング５３の機能によって所定位置を保持したままでねじ部材５１が回転するので、雌ねじ部４３ひいてはナット部材４２が前方に移動し、設定ナット４８に面接触して支持される球面座金４６がレバー７８の第１作動部７８ａを前方に引き、前述したようにレバー７８を揺動させる。このレバー７８の揺動により、前述したようにレバー７８の第２作動部７８ｂが設定ナット６８に面接触して支持される球面座金４７を介してロッキングバー６を後方へ引く。このロッキングバー６及び固定用ブロック３０の後方移動により、クランプ３，４が閉じられてフック２が確実に係合把持されると共に、所定の型締め力が金型６０，６１の上部にも得られる。ロッキングバー６に作用する引き力は、スラストベアリング５３によって支持されるので、駆動源５２には作用しない。金型６０，６１の型閉じ動作が終了したなら、駆動源５２を停止させる。ねじ部材５１とナット部材４２とは非可逆ねじ結合しているので、駆動源５２を停止しても、ナット部材４２が移動して型締力が低下することはない。
【００２７】
金型６０，６１の型開きのときには、リアプレート７１の前方（矢印Ａ方向）への移動及び後側の型取付板７２の後方（反矢印Ａ方向）への移動に伴い、ロッキングバー６の後端の球面座金４７がレバー７８の第２作動部７８ｂに圧接係止することが解除されるので、弾性体３６によって付勢される固定用ブロック３０が前進移動し、クランプ開閉機構（３３，３４、３ａ，４ａ）の機能によってクランプ３，４が開かれてフック２の係合把持が解放される。ロッキングバー６の後端部の球面座金４７、設定ナット６８、ロックナット６９等は、リアプレート７１の切欠部７１ａ内で自由に相対移動する。
【００２８】
この金型６０，６１の型開きのときにも、駆動装置５を作動させ、ナット部材４２を後方に駆動させて所定位置に復帰させる。すなわち、金型６０，６１が離反する型開き動作の開始と同時又は少し遅れて、駆動源５２により、継手５５を介してねじ部材５１を逆方向に回転駆動すれば、スラストベアリング５３の機能によってねじ部材５１が所定位置を保持したままで回転するので、雌ねじ部４３ひいてはナット部材４２が後方に移動し、レバー７８が所定位置に復帰可能になる。これにより、弾性体３６によって付勢されるロッキングバー６及び固定用ブロック３０も適宜に前方へ移動可能になるので、クランプ３，４が開かれた状態で、ナット部材４２が所定位置に復帰することになる。
【００２９】
金型６０，６１の型開きのときには、型締機構６２の作動により、設定ナット６８（及び球面座金４７）がロッキングバー６と共にリアプレート７１に対して後方に大きく移動し、球面座金４７のレバー７８の第２作動部７８ｂへの圧接係止が自動的に解除される。これにより、弾性体３６によって付勢される固定用ブロック３０が前進移動し、クランプ３，４が開かれてフック２の把持が解放される。このため、ナット部材４２及びレバー７８の復帰は、型閉じのときに設定ナット４８及び球面座金４６とレバー７８の第１作動部７８ａとが早期に係合してクランプ３，４が閉じてフック２の把持が行なわれなくなる不具合を防止するように行なえばよい。従って、金型６０，６１の型開きに際する駆動装置５の作動は、型締機構６２の作動に伴うクランプ３，４の開き作動が行なわれた後、次の型閉じ作動前に行なうことも可能である。
【００３０】
ところで、上記１実施の形態においては、駆動装置５及びレバー７８をリアプレート７１に取付け、駆動装置５の駆動力をレバー７８及びロッキングバー６を介してクランプ３，４に伝達させたが、これに限られず、駆動装置５及びレバー７８を前側の型取付板７０の前面及び後側の型取付板７２の後面のいずれか一方に取付けることも可能である。駆動装置５は、レバー７８の第１作動部７８ａを押すように作動させる。これによれば、ロッキングバー６を短縮又は事実上省略することができるので、更に構造が簡素になることに加え、ロッキングバー６をレバー７８を介して引く駆動装置５の反力がリアプレート７１に作用しないので、型締機構６２の小容量化・小型化を図ることができる。勿論、駆動装置５及びレバー７８を前側の型取付板７０に取付ける場合には、フック２を後側の型取付板７２に取付け、クランプ３，４、クランプ開閉機構、固定用ブロック３０、案内部材３８等を前側の型取付板７０に取付ける。
【００３１】
また、金型６０，６１の型開きのときには、弾性体３６によって付勢される固定用ブロック３０が前進移動し、クランプ開閉機構（３３，３４、３ａ，４ａ）の動作によってクランプ３，４が開かれてフック２の係合把持が解放されたが、雌ねじ部４３を有するナット部材４２とレバー７８の第１作動部７８ａとを相対揺動可能に一体又は連結させて設けると共に、レバー７８の第２作動部７８ｂとロッキングバー６とを相対揺動可能に一体又は連結させて設け、弾性体３６を省略することも可能である。駆動装置５及びレバー７８をリアプレート７１に取付けた場合には、駆動装置５によってクランプ３，４を開閉させると共に引動させて所定の型締め力を生じさせるのみならず、型締機構６２の作動に伴うリアプレート７１及び後側の型取付板７２の移動にナット部材４２を追従作動させる。サポート部材４１は、ロッキングバー６と応動するナット部材４２の動作が阻害されない大きさに形成する。駆動装置５及びレバー７８を前側の型取付板７０及び後側の型取付板７２のいずれか一方に取付ける場合には、駆動装置５によってクランプ３，４を開閉させると共に引動させて所定の型締め力を生じさせるのみでよい。
【００３２】
図１に示すように駆動装置５が固定されるリアプレート７１と駆動装置５との間に、所定厚さのスペーサ５８を介装させれば、設定ナット４８，６８を調節移動させることなく、レバー７８の第１作動部７８ａと球面座金４６との間隔、ひいてはレバー７８の第２作動部７８ｂとロッキングバー６の後端の球面座金４７との間隔の調節が行なえる。例えば、交換によって金型６０，６１の厚さが大きく変化し、クランプ３，４、フック２等の摩耗による影響と比較して、クランプ３，４とフック２との係止位置が大きく変化したときに、スペーサ５８の厚さを変えて、上記間隔の調節を容易に行なうことができる。必要に応じ、固定用ブロック３０の位置変化に合わせて、クランプ開閉機構（３３，３４，３ａ，４ａ）の位置調整も行なう。クランプ開閉機構（３３，３４，３ａ，４ａ）の位置調整は、後側の型取付板７２と案内部材３８との間に所定厚さのスペーサを介装させて行なうことができる。
【００３３】
駆動装置５が一方の型取付板７２，７０に固定される場合には、リアプレート７１と駆動装置５との間に変えて、型取付板７２，７０と駆動装置５との間に所定厚さのスペーサ５８を介装させると共に、型取付板７２，７０と案内部材３８との間に所定厚さのスペーサを介装させてクランプ開閉機構（３３，３４，３ａ，４ａ）の位置調整を行なえばよい。スペーサ５８は、レバー７８の第１作動部７８ａと球面座金４６及び設定ナット４８との間隔の調節を行なうためのものであり、サポート部材４１とケース５４との間に介装させることも可能である。ロックナット４９を弛め、設定ナット４８の螺合位置を変更し、或いはロックナット６９を弛め、設定ナット６８の螺合位置を変更しても、上記間隔の事実上の調節を容易に行なうことができる。フック部２１ａの突出長さは、位置決め部材２０を正又は逆に回転させて調節することができる。
【００３４】
【発明の効果】
以上の説明によって理解されるように、本発明に係る中空成形機の型締装置によれば、次の効果が得られる。
（１）請求項１及び２の発明によれば、一対の型取付板及びリアプレートのいずれかに駆動装置を固定し、かつ、レバーを揺動自在に支持させて設けるので、駆動装置の駆動力を伝達するロッキングバー等の部材を２分割する必要がない。また、駆動装置は、その駆動力を伝達するロッキングバー等の部材の中間に設けないので、駆動装置を支持する別途の部材が不要であるのみならず、駆動装置を支持する別途の部材を摺動自在に設ける必要も無くなる。その結果、中空成形機の型締装置の構造が簡素になる。
【００３５】
加えて、駆動装置による引き力がレバーによって方向変換されてクランプに作用する。このため、レバー比を変えて所要の引き力をクランプに容易に作用させることができ、駆動装置の小容量化・小型化、ひいては省エネルギー及びコストダウンを図ることができる。レバー比は、１：１、１：３等を自由に選定することができる。また、駆動装置及びレバーを前側の型取付板、後側の型取付板及びリアプレートの前面のいずれかに取付けることにより、駆動装置がリアプレートより後方に突出しなくなる。その結果、リアプレートの後側に近接させて押出機の部品などを配置することができ、例えば押出機の揺動支点を適正位置に採って、押出機の揺動作動を少力でスムースに行なわせることが可能になる。
【００３６】
更に、駆動装置を一対の型取付板のいずれかに固定して設ければ、駆動装置の駆動力を伝達する長尺なロッキングバー等の部材を事実上省略することができるのみならず、駆動装置による引き力の反力がリアプレートを介して型締機構に作用することが解消する。その結果、型締機構の小容量化・小型化を図ることができる。
【００３７】
また、駆動装置が、サポートと、サポートに固設される電動機と、電動機によって回転駆動されるねじ部材と、ねじ部材に非可逆ねじ結合するナット部材とを有する。ねじ部材とナット部材とは非可逆ねじ結合しているので、電動機を停止しても、ナット部材が回転して型締力が低下することはない。その結果、金型の型閉じ動作が終了したときに、電動機を停止させることができ、駆動装置に、別途に弛み止め手段を設ける必要もない。従つて、駆動装置は、型閉じのときに所定の型締め力が得られるように短時間だけ駆動し、また型開きのときにナット部材を復帰させるために短時間だけ駆動すればよく、省エネルギーに役立つ。加えて、駆動に伴う騒音が小さく、成形品及び作業環境を汚損することがなく、温度依存性を排して、確実な作動及び作動誤差の少ない精緻な制御が可能になる。
【００３８】
更に、シリンダ装置を使用するものと比較して、メンテナンス、作業ロス及び費用の低減、並びに稼働率の向上が得られる。特に、従来例のようにロッキングバーの中間にシリンダ装置を設けるものでは、シリンダ装置の摺動部に偏荷重が作用して早期に摩耗する傾向を呈する。これに対し、型取付板に駆動装置を固定して設ける場合は勿論、リアプレートに駆動装置を固定して設ける場合であっても、偏荷重の作用によって早期摩耗を生ずることを防止することができる。ねじ部材及びナット部材のピッチを選定することにより、高出力が容易に得られる。電動機にトルク制限機構を付加することにより、所要出力を任意かつ簡単に設定できる。
【００３９】
（３）請求項４の発明によれば、ねじ部材をサポートに設けるスラストベアリングによって回転自在に支持させるので、型締めのための引き力がスラストベアリングによって支持され、駆動源には作用しない。その結果、精緻な制御が可能になると共に、駆動源の耐久性が向上する。
【００４０】
（４）請求項６の発明によれば、ナット部材の回止め手段が設けられ、ナット部材の前後動のみが可能である。その結果、ねじ部材の回転動作により、ナット部材の前後動が正確に得られるようになる。
【図面の簡単な説明】
【図１】本発明の１実施の形態に係る中空成形機の型締装置の要部を一部断面で示す側面図。
【図２】同じく作用説明図。
【図３】同じく駆動装置の要部を示す断面図。
【図４】同じくレバーの第１作動部及び第２作動部を示すための説明図。
【図５】同じく中空成形機の型締装置の概略を示す平面図。
【図６】同じく中空成形機の型締装置の概略を示す側面図。
【符号の説明】
１ロッキング機構
２フック
３，４クランプ
３ａ，４ａ長孔（クランプ開閉機構）
５駆動装置
６ロッキングバー
３０固定用ブロック
３１，３２ピン
３３，３４案内ピン（クランプ開閉機構）
３６弾性体
４１サポート部材（サポート）
４１ａ案内部（回止め手段）
４２ナット部材
４６，４７球面座金（被係合部）
４８設定ナット（被係合部）
５０駆動機構
５１ねじ部材
５２駆動源（電動機）
５３スラストベアリング
５４ケース（サポート）
５８スペーサ
６０金型
６１金型
６２型締機構
６８設定ナット（被係合部）
７０前側の型取付板
７１リアプレート
７２後側の型取付板
７７支点
７８レバー
７８ａ第１作動部
７８ｂ第２作動部
８０ロッド[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a mold clamping device of a hollow molding machine provided with a locking mechanism.
[0002]
[Prior art and problems]
A mold clamping device of this type of hollow molding machine is to clamp a hook by a clamp and fix the upper part of a two-part mold by a locking bar so as not to open. Conventionally, Japanese Patent Publication No. 60-17694, Those described in Japanese Utility Model Laid-Open No. 61-95509 are known. The reason for omitting the provision of a locking mechanism and the provision of a rod (tie bar) on the upper part of a pair of molds is that when the mold and mold clamping device move with a series of molding operations, the parison or molded product In order to avoid interference with the rod and to prevent the burr cutting from getting worse due to omission of the upper rod, the upper part of the two-part mold is fixed not to open by a locking mechanism is doing.
[0003]
In this type of hollow molding machine mold clamping device, when wear occurs on the clamps, hooks, etc., the mold that receives the internal pressure during molding opens by the worn dimensions, and defects such as burrs occur in the molded product. . In order to perform correction according to the amount of wear, an effective length is adjusted by rotating an adjustment nut provided at one end of the locking bar. However, this adjustment has a problem that it is troublesome and time-consuming.
[0004]
The mold clamping device of the hollow molding machine described in Japanese Utility Model Publication No. 61-95509 proposes a locking mechanism that solves this problem, and a hydraulic or pneumatic cylinder device is provided on the locking bar to automatically wear out the amount of wear. Correction is performed, the mold is fixed, and the opening is prevented.
[0005]
However, this conventional locking mechanism has a structure in which the locking bar is divided into two, the cylinder device is provided between the pair of locking bars, and the cylinder device is supported by the cylinder support. Moreover, the cylinder device needs to be slidably supported by the cylinder support. Thus, since the locking bar is divided into two, the structure becomes complicated. Further, since the cylinder device is provided between the pair of locking bars, the cylinder device must be slidably supported, which has a technical problem that the structure becomes complicated. Further, since the locking bar is installed between the rear mold mounting plate and the rear plate, the pulling force by the cylinder device acts as a mold opening force on the mold clamping mechanism via the rear plate. In order to overcome this problem, the mold clamping mechanism will be increased in capacity and size.
[0006]
Moreover, since it is difficult to secure a predetermined pulling force with a pneumatic cylinder device, it must be a hydraulic cylinder device. In addition, the cylinder device must always be driven in order to maintain a predetermined clamping force. Therefore, when energy consumption and noise accompanying driving are large and oil leakage occurs from the cylinder device and piping, not only the molded product but also the environment is contaminated by oil and oil mist. For this reason, not only the replacement and maintenance of the consumable parts are frequently required, but it is virtually impossible to install in a clean room where clean work is required. In addition, since the viscosity of the hydraulic oil changes depending on the temperature, the reliability and stability of the operation are lacking, and an operation error is generated, so that precise control is difficult.
[0007]
[Means for Solving the Problems]
The present invention has been made in view of such a conventional technical problem, and its configuration is as follows.
The invention of claim 1 includes a rod 80, a front mold attachment plate 70 and a mold 60 attached to the rod 80, a rear plate 71 attached to the rod 80, and a rear mold slidably supported by the rod 80. A mold clamping mechanism 62 that closes and opens the pair of molds 60 and 61 by enlarging and reducing the distance between the mounting plate 72 and the mold 61, and the rear mold mounting plate 72 and the rear plate 71. And one side Said type Hook 2 to be attached to mounting plates 70 and 72, and the other Said type Attached to the mounting plates 72 and 70, and fixed to either the clamps 3 and 4 that are opened and closed by the clamp opening / closing mechanisms 33, 34, 3a, and 4a, and the other die mounting plates 72 and 70 and the rear plate 71. And a lever 78 that is swingably supported by the drive device 5 and the fulcrum 77, the first operation portion 78 a of the lever 78 is operated by the drive device 5, and the clamp opening / closing mechanism is operated by the second operation portion 78 b of the lever 78. 33, 34, 3 a, 4 a are operated to close the clamps 3, 4 to engage and hold the hook 2 with the clamps 3, 4. 2 Actuate by the operating part 78b to generate a predetermined clamping force While trying to Clamping of empty molding machine In the The lamps 3, 4 are pivotally coupled to the fixing block 30, and the drive device 5 is fixed to one of the other mold mounting plates 72, 70 and the rear plate 71. An electric motor 52 fixed to the supports 41, 54, a screw member 51 that is rotationally driven by the electric motor 52, and a nut member 42 that is irreversibly screwed to the screw member 51. When the mold is opened, the screw member 51 is rotationally driven by the electric motor 52, the first actuating portion 78a and the second actuating portion 78b of the lever 78 are moved by the movement of the nut member 42, and the fixing block 30 is moved. 3 and 4 are opened by the operation of the clamp opening / closing mechanisms 33, 34, 3a and 4a to release the engaging grip of the hook 2, and when the molds 60 and 61 are closed, The screw member 51 is reversely driven by the machine 52, and the first actuating portion 78a and the second actuating portion 78b of the lever 78 are operated by the movement of the nut member 42 to move the fixing block 30, and the clamps 3 and 4 are clamped. The hook 2 is engaged and gripped by the operation of the opening / closing mechanisms 33, 34, 3a and 4a. Inside This is a mold clamping device of an empty molding machine.
Claim Item 2 The invention includes a rod 80, a front mold mounting plate 70 and a mold 60 that are attached to the rod 80, a rear plate 71 that is attached to the rod 80, a rear mold mounting plate 72 that is slidably supported by the rod 80, and A hollow provided with a mold 61 and a mold clamping mechanism 62 for enlarging and reducing the distance between the rear mold mounting plate 72 and the rear plate 71 to close and open the pair of molds 60 and 61. In the mold clamping device of the molding machine, the hook 2 attached to the front mold attachment plate 70, the clamps 3 and 4 attached to the rear mold attachment plate 72, the drive device 5 fixed to the rear plate 71, and the rear plate 71. And a lever 78 supported by a fulcrum 77 in a swingable manner. The clamps 3 and 4 are pin-coupled to the fixing block 30 in a swingable manner, and the locking bar 6 is connected to the fixing block 30. Driving The device 5 operates the first actuating portion 78 a to swing the lever 78, and the second actuating portion 78 b of the lever 78 moves the locking bar 6 and the fixing block 30, and the drive device 5 moves to the rear plate 71. The support 41, 54 fixed, the electric motor 52 fixed to the support 41, 54, the screw member 51 that is rotationally driven by the electric motor 52, and the nut member 42 that is irreversibly screwed to the screw member 51 are provided. When the molds 60 and 61 are opened, the fixing block 30 and the locking bar 6 urged by the elastic body 36 move forward, and the clamp 3 is moved by the operation of the clamp opening / closing mechanisms 33, 34, 3a, and 4a. , 4 is opened, the engagement grip of the hook 2 is released, and the nut member 42 releases the engagement of the lever 78 with the first operating portion 78a, When the locking of the second operating portion 78b of the bar 78 and the locking bar 6 is released and the molds 60 and 61 are closed, the nut member 42 is operated by the operation of the driving device 5 so that the first operation of the lever 78 is performed. The lever 78 swings by engaging with the portion 78a, the second operating portion 78b of the lever 78 engages with the locking bar 6, and the locking bar 6 and the fixing block 30 are moved while the elastic body 36 is compressed. The clamps 3 and 4 are closed by the operation of the clamp opening and closing mechanisms 33, 34, 3a, and 4a, and the hooks 2 are engaged and gripped, and the clamps 3 and 4 that engage and grip the hooks 2 are moved. A mold clamping device for a hollow molding machine, wherein a predetermined mold clamping force is generated.
Claim Item 3 The invention is characterized in that a spacer 58 having a predetermined thickness is provided in order to adjust the relative position between the nut member 42 and the first operating portion 78a of the lever 78. Item 2 A mold clamping device for a hollow molding machine.
Claim Item 4 The invention is characterized in that the screw member 51 is rotatably supported by a thrust bearing 53 provided on the supports 41 and 54. Item 1, 2 or 3 A mold clamping device for a hollow molding machine.
Claim Item 5 In the invention, the first operating portion 78a and the second operating portion 78b of the lever 78 are provided with spherical washers 46 and 47, respectively, and the engaged portion 46 of the nut member 42 that engages with the first operating portion 78a of the lever 78. , 48 and the second actuating portion 78b of the lever 78 to form engaged portions 47, 68 for moving the fixing block 30. Item 1, 2, 3 or 4 A mold clamping device for a hollow molding machine.
Claim Item 6 The invention is characterized in that a rotation stop means 41a for the nut member 42 is provided, and only the nut member 42 can be moved back and forth. Item 1, 2, 3, 4 or 5 A mold clamping device for a hollow molding machine.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. First, an outline of a mold clamping device of a hollow molding machine provided with a locking mechanism 1 will be described with reference to FIGS. In the figure, reference numeral 80 denotes a rod (tie bar) that is normally arranged in parallel, and is slidably provided on a frame 81 (transfer table). The lower part of the front mold mounting plate 70 is fixed to one end of the rod 80, the lower part of the rear plate 71 is fixed to the other end of the rod 80, and the rear mold is fixed to the intermediate part of the rod 80. A lower portion of the mounting plate 72 is slidably supported.
[0009]
The divided molds 60 and 61 are attached to the opposing surfaces of the pair of mold attachment plates 70 and 72, respectively. Further, between the rear mold attachment plate 72 and the rear plate 71, the distance between the rear mold attachment plate 72 and the rear plate 71 is enlarged and reduced to close the molds 60 and 61 (the molds). And a mold clamping mechanism 62 for performing mold opening. The mold clamping mechanism 62 is constituted by a link device having a first link 63 and a second link 64 that constitute a toggle mechanism. The first link 63 has a front end that is pin-coupled to the rear mold mounting plate 72 via a clevis 65 and is swingable, and a rear end that is pin-coupled to the guide block 66 and is swingable. The front end of the second link 64 is pin-coupled to the guide block 66 and is swingable. The rear end of the second link 64 is pin-coupled to the rear plate 71 via a clevis 67 and is swingable.
[0010]
The guide block 66 is driven in the vertical direction (left-right direction) in FIG. 5 by the guide block drive mechanism 90 shown in FIG. The guide block drive mechanism 90 includes a ball screw 91 rotatably supported on the frame 81, a toggle motor 93 attached to the frame 81, and a coupling 92 that connects the rotation shaft of the toggle motor 93 and the ball screw 91. And a ball nut 94 fixed to the guide block 66 and screwed into the ball screw 91.
[0011]
If the ball screw 91 is rotated forward and backward by the toggle motor 93 via the coupling 92, the ball nut 94 and the guide block 66 are driven up and down in FIG. 5, so that the pair of links 63 and 64 are bent. A state and a straight line state are taken. As the pair of links 63 and 64 extend linearly, the rear mold mounting plate 72 and the mold 61 move forward (in the direction of arrow A) while being guided by the rod 80, and the rear plate 71, Since the rod 80, the front mold mounting plate 70, and the mold 60 move in the rearward direction (counter arrow A direction), the pair of molds 60 and 61 are closed. On the other hand, when the links 63 and 64 are bent and deformed, the molds 60 and 61 are opened. The mold clamping mechanism 62 and the guide block drive mechanism 90 can also be configured by a cylinder device or the like.
[0012]
Then, at least one set of the locking mechanism 1 is provided on the upper side of the front mold mounting plate 70, the rear mold mounting plate 72 and the rear plate 71. The locking mechanism 1 is located on the side of the mold 60, which is a hook 2 attached to the front mold attaching plate 70, and on the side of the mold 61, and clamps 3, 4 attached to the rear mold attaching plate 72. And a driving device 5 attached to the rear plate 71, a lever 78 that is swingably supported by the rear plate 71, and a locking bar 6 that transmits the driving force of the driving device 5 to the clamps 3 and 4. . Note that a part of the locking bar 6 is omitted in FIG.
[0013]
As shown in FIG. 1, the hook 2 has a nut-like positioning member 20 fixed to the front mold mounting plate 70 with a screw 24 and a male screw portion screwed into the female screw portion of the positioning member 20 at the front end portion. It has a hook main body 21 having a hook portion 21 a that expands at the end, and a key 22 that is intended to prevent the hook main body 21 from rotating relative to the mold attachment plate 70. Thus, with the screw 24 removed, the hook body 21 is screwed or unscrewed while being guided by the key 22 by rotating the positioning member 20 whose flange portion is locked to the mold mounting plate 70 forward or backward. Therefore, the protrusion length of the hook portion 21a can be adjusted up or down. Note that the hook 2 normally takes a position where the hook portion 21 a slightly protrudes rearward from the mold 60.
[0014]
The clamps 3 and 4 are provided so as to operate symmetrically in the vertical direction in the figure. That is, the clamps 3 and 4 are pivotally supported by the fixing block 30 by pins 31 and 32, respectively. The fixing block 30 is fixed to the rear mold mounting plate 72 by screws 37. It is slidable back and forth as guided by. The clamps 3 and 4 are attached with a clamp opening / closing mechanism. The clamp opening / closing mechanism includes guide pins 33 and 34 fixed to the front extension of the guide member 38, and elongated holes 3a and 4a formed on the clamps 3 and 4 and engaged with the guide pins 33 and 34, respectively. It consists of The clamps 3 and 4 rotate around the pins 31 and 32 while being guided by the guide pins 33 and 34 as the fixing block 30 moves back and forth, and the hook-shaped tip ends open and close while moving back and forth. To do.
[0015]
The locking bar 6 has an intermediate large-diameter portion and front and rear small-diameter portions and is integrated, and a small-diameter front end that penetrates the rear mold attachment plate 72 is connected (screwed) to the fixing block 30. A rear end portion extending to the rear plate 71 is driven by the driving device 5 and the lever 78. The front end of the large-diameter portion of the locking bar 6 is slidably guided by a cylindrical slide bush guide 35 fixed to the rear mold mounting plate 72, and is wound around the small-diameter front end portion of the rear mold mounting plate 72. An elastic body 36 made of a coil spring inserted in the through hole urges the fixing block 30 and the locking bar 6 forward. The elastic body 36 has a rear end in contact with the front surface of the slide bush guide 35, and a front end elastically presses the rear surface of the fixing block 30 at all times. A stopper can be formed to restrict the forward movement position of the fixing block 30 biased by the elastic body 36.
[0016]
The drive device 5 is disposed so as to avoid interference with the mold clamping mechanism 62, and includes a support member 41 integrated with a mounting plate 41b fixed to the front surface of the rear plate 71 by the screw 40 shown in FIG. And a nut member 42 that is housed inside and is driven back and forth by the drive mechanism 50. As shown in FIG. 3, the nut member 42 has an internal thread portion 43 and an integral shaft portion 44, and the distal end of the shaft portion 44 forms a thread portion 45. A part (protrusion) of the nut member 42 is slidably engaged with the guide portion 41a of the support member 41, can only move back and forth, and is restricted in rotation. The guide portion 41 a of the support member 41 constitutes a rotation stop means for the nut member 42.
[0017]
The lever 78 is swingably supported by a block 79 fixed to the rear plate 71 by a fulcrum 77 made of a pin, and extends in the left-right direction. As shown in FIG. 4, the first actuating portion 78 a that is bifurcated at one end of the lever 78 is engaged with the nut member 42, and the second actuating portion 78 b that is bifurcated at the other end is engaged with the rear end portion of the locking bar 6. The pulling force due to the forward movement of the nut member 42 is reversed by the lever 78 and converted into the pulling force to the rear of the locking bar 6.
[0018]
That is, the first operating portion 78 a of the lever 78 can be brought into contact with the nut member 42 via the spherical washer 46, and the setting nut 48 is screwed into the screw portion 45 of the nut member 42, so that the setting nut 48 The spherical washer 46 comes into surface contact with the front spherical surface. As a result, the first operating portion 78a of the lever 78 can be relatively tilted while maintaining surface contact with the shaft portion 44 of the nut member. The spherical washer 46 and the setting nut 48 constitute an engaged portion of the nut member 42 with which the first operating portion 78a of the lever 78 is engaged. 49 is a lock nut.
[0019]
On the other hand, the second operating portion 78b of the lever 78 can be abutted and engaged with the rear end of the locking bar 6 via the spherical washer 47, and the setting nut 68 is screwed into the male screw at the rear end portion of the small diameter of the locking bar 6. Then, the spherical washer 47 comes into surface contact with the front spherical surface of the setting nut 68. Therefore, the second operating portion 78b of the lever 78 can be tilted relative to the locking bar 6. The spherical washer 47 and the setting nut 68 constitute an engaged portion of the locking bar 6 with which the second operating portion 78b of the lever 78 is engaged. Reference numeral 69 denotes a lock nut. The rear plate 71 has a notch 71a, and the spherical washer 47, the setting nut 68, the lock nut 69, the second operating portion 78b of the lever 78, etc. at the rear end of the locking bar 6 do not interfere with the rear plate 71. It is like that.
[0020]
As shown in FIG. 3, the drive mechanism 50 includes a screw member 51 and a drive source 52 that drives the screw member 51 to rotate forward or backward, and the thrust member 51 maintains a predetermined position in the front-rear direction. A bearing 53 is attached. That is, the case 54 is fixed to the front surface of the support member 41, the drive source 52 is fixed to the front side of the case 54, and the disk 51 a integrated with the screw member 51 is rotated by the thrust bearing 53 inside the case 54. It is supported freely. A front end portion of the screw member 51 is connected to a driving source 52, specifically, a rotating shaft of an electric motor via a joint 55. The support member 41 and the case 54 constitute a support.
[0021]
The screw member 51 is irreversibly screwed to the female screw portion 43 of the nut member 42. Here, the irreversible screw coupling means that the screw member 51 and the nut member 42 are in a coupled state in which neither the screw member 51 nor the nut member 42 rotates due to the action of the pulling force acting between the screw member 51 and the nut member 42. It can be obtained by appropriately selecting the pitch of the screw member 51 and the nut member 42. Here, the screw member 51 and the nut member 42 only need to be screwed together (irreversible screw connection). The screw member 51 includes a female screw engraved, and the nut member 42 includes a male screw. Including those engraved.
[0022]
Next, the operation will be described. When the pair of molds 60 and 61 is opened, the distance between the rear mold mounting plate 72 and the rear plate 71 is reduced by being driven by the mold clamping mechanism 62, and the rear plate 71 and the front mold mounting plate 70 are reduced. And the metal mold | die 60 moves ahead (arrow A direction) because the rod 80 slides with respect to the flame | frame 81. FIG. Further, the rear mold mounting plate 72 and the mold 61 move rearward (counter arrow A direction) while being slidably guided by the rod 80.
[0023]
When the molds 60 and 61 are closed, the distance between the rear mold mounting plate 72 and the rear plate 71 is increased by being driven by the mold clamping mechanism 62, and the rear plate 71, the front mold mounting plate 70, and the mold are expanded. 60 moves rearward as the rod 80 slides relative to the frame 81. Further, the rear mold mounting plate 72 and the mold 61 move forward while being slidably guided by the rod 80. As a result, a predetermined clamping force is obtained at the lower part of the molds 60 and 61.
[0024]
The locking mechanism 1 is also operated in accordance with the mold closing and mold opening operations of the molds 60 and 61. When the molds 60, 61 are closed, the molds 60, 61 are moved along with the rear plate 71 moving backward (in the direction of the arrow A) and the rear mold mounting plate 72 moving forward (in the direction of the arrow A). At the same time or slightly after the start of the mold closing operation in which 61 is in close contact, the second actuating portion 78b of the lever 78 is engaged with the rear end of the locking bar 6, that is, the spherical washer 47 and the setting nut 68, and the locking bar 6 is moved backward. Be drawn. As a result, the fixing block 30 moves backward while the elastic body 36 is compressed, the clamps 3 and 4 are closed by the function of the clamp opening / closing mechanism, and the hook 2 is engaged and held. The clamp opening / closing mechanism is constituted by the guide pins 33 and 34 and the long holes 3a and 4a as described above.
[0025]
When the molds 60 and 61 are closed, the driving device 5 is operated. That is, the nut member 42 is driven forward by the drive mechanism 50 at the same time or slightly after the start of the mold closing operation in which the molds 60 and 61 are in close contact, and the first operating portion 78a of the lever 78 is moved to the spherical washer 46 and the setting nut. The lever 78 is engaged and pulled forward, and the lever 78 is swung around the fulcrum 77. By the swing of the lever 78, the locking bar 6 is pulled rearward in a state where the second operating portion 78b of the lever 78 is locked to the rear end of the locking bar 6, that is, the spherical washer 47. As a result, the fixing block 30 is forcibly moved backward, so that the clamps 3 and 4 can be operated by the function of the clamp opening / closing mechanism (33, 34, 3a, 4a) regardless of wear of the clamps 3 and 4 and the hooks 2 and the like. Is closed and the hook 2 is securely engaged and held. Since the nut member 42 is engaged with the guide portion 41a of the support member 41, the nut member 42 only moves back and forth without rotating.
[0026]
Specifically, if the screw member 51 is rotationally driven in the forward direction by the drive source 52 via the joint 55, the screw member 51 rotates while maintaining a predetermined position by the function of the thrust bearing 53. As a result, the nut member 42 moves forward, and the spherical washer 46 supported in surface contact with the setting nut 48 pulls the first operating portion 78a of the lever 78 forward, and swings the lever 78 as described above. By swinging the lever 78, the locking bar 6 is pulled backward via the spherical washer 47 supported by the second operating portion 78b of the lever 78 in surface contact with the setting nut 68 as described above. By moving the locking bar 6 and the fixing block 30 backward, the clamps 3 and 4 are closed and the hook 2 is securely engaged and held, and a predetermined clamping force is also obtained on the upper portions of the molds 60 and 61. It is done. The pulling force acting on the locking bar 6 is supported by the thrust bearing 53 and therefore does not act on the drive source 52. When the mold closing operation of the molds 60 and 61 is completed, the drive source 52 is stopped. Since the screw member 51 and the nut member 42 are irreversibly screw-coupled, even if the drive source 52 is stopped, the nut member 42 does not move and the mold clamping force does not decrease.
[0027]
When the molds 60 and 61 are opened, the locking bar 6 is moved along with the movement of the rear plate 71 forward (in the direction of arrow A) and the movement of the rear mold mounting plate 72 in the rear (in the direction of arrow A). Since the spherical washer 47 at the rear end is released from being pressed and locked to the second operating portion 78b of the lever 78, the fixing block 30 biased by the elastic body 36 moves forward, and the clamp opening / closing mechanism (33, 34, 3a and 4a), the clamps 3 and 4 are opened, and the hook 2 is released from engagement. The spherical washer 47, the setting nut 68, the lock nut 69, and the like at the rear end of the locking bar 6 freely move relative to each other within the notch 71a of the rear plate 71.
[0028]
Also when the molds 60 and 61 are opened, the driving device 5 is operated to drive the nut member 42 backward to return it to a predetermined position. That is, if the screw member 51 is rotated in the reverse direction via the joint 55 by the drive source 52 at the same time or slightly after the start of the mold opening operation in which the molds 60 and 61 are separated, the function of the thrust bearing 53 Since the screw member 51 rotates while holding the predetermined position, the female screw portion 43 and the nut member 42 move rearward, and the lever 78 can be returned to the predetermined position. As a result, the locking bar 6 and the fixing block 30 urged by the elastic body 36 can also be appropriately moved forward, so that the nut member 42 returns to a predetermined position with the clamps 3 and 4 opened. It will be.
[0029]
When the molds 60 and 61 are opened, the setting nut 68 (and the spherical washer 47) is moved largely backward with respect to the rear plate 71 together with the locking bar 6 by the operation of the mold clamping mechanism 62. The press-contact locking of 78 to the second operating portion 78b is automatically released. As a result, the fixing block 30 urged by the elastic body 36 moves forward, the clamps 3 and 4 are opened, and the grip of the hook 2 is released. Therefore, when the nut member 42 and the lever 78 are returned, when the mold is closed, the setting nut 48 and the spherical washer 46 and the first operating portion 78a of the lever 78 are engaged early, and the clamps 3 and 4 are closed and the hooks are closed. What is necessary is just to carry out so that the malfunction which becomes impossible to hold | grip of 2 may be prevented. Therefore, the operation of the driving device 5 when the molds 60 and 61 are opened is performed after the clamps 3 and 4 are opened according to the operation of the mold clamping mechanism 62 and before the next mold closing operation. Is also possible.
[0030]
In the first embodiment, the driving device 5 and the lever 78 are attached to the rear plate 71, and the driving force of the driving device 5 is transmitted to the clamps 3 and 4 via the lever 78 and the locking bar 6. However, the driving device 5 and the lever 78 can be attached to either the front surface of the front mold mounting plate 70 or the rear surface of the rear mold mounting plate 72. The driving device 5 is operated so as to push the first operating portion 78 a of the lever 78. According to this, since the locking bar 6 can be shortened or practically omitted, the structure is further simplified, and the reaction force of the driving device 5 that pulls the locking bar 6 through the lever 78 is influenced by the rear plate 71. Therefore, the mold clamping mechanism 62 can be reduced in capacity and size. Of course, when the driving device 5 and the lever 78 are mounted on the front mold mounting plate 70, the hook 2 is mounted on the rear mold mounting plate 72, the clamps 3 and 4, the clamp opening / closing mechanism, the fixing block 30, the guide member. 38 and the like are attached to the front mold attaching plate 70.
[0031]
When the molds 60 and 61 are opened, the fixing block 30 urged by the elastic body 36 moves forward, and the clamps 3 and 4 are moved by the operation of the clamp opening / closing mechanism (33, 34, 3a, 4a). The hook 2 is opened and the gripping of the hook 2 is released, but the nut member 42 having the female screw portion 43 and the first operating portion 78a of the lever 78 are provided so as to be capable of relative swinging together or connected to each other. It is also possible to provide the second operating portion 78b and the locking bar 6 integrally or coupled so as to be able to swing relative to each other, and the elastic body 36 can be omitted. When the drive device 5 and the lever 78 are attached to the rear plate 71, the clamps 3 and 4 are opened and closed by the drive device 5 and pulled to generate a predetermined mold clamping force, as well as the operation of the mold clamping mechanism 62. The nut member 42 is operated to follow the movement of the rear plate 71 and the rear mold attachment plate 72 accompanying the above. The support member 41 is formed in a size that does not hinder the operation of the nut member 42 that reacts with the locking bar 6. When the driving device 5 and the lever 78 are attached to one of the front die mounting plate 70 and the rear die mounting plate 72, the clamps 3 and 4 are opened and closed by the driving device 5 and are moved by a predetermined mold clamping. It only needs to generate power.
[0032]
As shown in FIG. 1, if a spacer 58 having a predetermined thickness is interposed between the rear plate 71 to which the driving device 5 is fixed and the driving device 5, the setting nuts 48 and 68 are not adjusted and moved. The distance between the first actuating part 78a of the lever 78 and the spherical washer 46 can be adjusted, and the distance between the second actuating part 78b of the lever 78 and the spherical washer 47 at the rear end of the locking bar 6 can be adjusted. For example, the thickness of the molds 60 and 61 is greatly changed by the replacement, and the locking position between the clamps 3 and 4 and the hook 2 is greatly changed as compared with the influence of wear of the clamps 3 and 4 and the hook 2. In some cases, the distance can be easily adjusted by changing the thickness of the spacer 58. If necessary, the position of the clamp opening / closing mechanism (33, 34, 3a, 4a) is also adjusted in accordance with the position change of the fixing block 30. The position of the clamp opening / closing mechanism (33, 34, 3a, 4a) can be adjusted by inserting a spacer having a predetermined thickness between the rear mold attachment plate 72 and the guide member 38.
[0033]
When the driving device 5 is fixed to one of the mold mounting plates 72 and 70, the thickness is changed between the rear plate 71 and the driving device 5, and a predetermined thickness is provided between the mold mounting plates 72 and 70 and the driving device 5. The spacer 58 is interposed, and a spacer having a predetermined thickness is interposed between the mold mounting plates 72 and 70 and the guide member 38 to adjust the position of the clamp opening / closing mechanism (33, 34, 3a, 4a). Just do it. The spacer 58 is for adjusting the distance between the first operating portion 78 a of the lever 78 and the spherical washer 46 and the setting nut 48, and can be interposed between the support member 41 and the case 54. is there. Even if the lock nut 49 is loosened and the screwing position of the setting nut 48 is changed, or the lock nut 69 is loosened and the screwing position of the setting nut 68 is changed, the above-described interval can be easily adjusted. be able to. The protruding length of the hook portion 21a can be adjusted by rotating the positioning member 20 forward or backward.
[0034]
【The invention's effect】
As understood from the above description, the mold clamping device for a hollow molding machine according to the present invention provides the following effects.
(1) Claim 1 and 2 According to the invention, the driving device is fixed to either one of the pair of mold mounting plates and the rear plate, and the lever is swingably supported, so that the member such as a locking bar that transmits the driving force of the driving device is provided. Need not be divided into two. In addition, since the driving device is not provided in the middle of a member such as a locking bar that transmits the driving force, a separate member that supports the driving device is not necessary, and a separate member that supports the driving device is slid. There is no need to provide it freely. As a result, the structure of the mold clamping device of the hollow molding machine is simplified.
[0035]
In addition, the pulling force by the driving device is redirected by the lever and acts on the clamp. For this reason, it is possible to easily apply a required pulling force to the clamp by changing the lever ratio, and it is possible to reduce the capacity and size of the driving device, and to save energy and reduce costs. The lever ratio can be freely selected from 1: 1, 1: 3, and the like. Further, by attaching the driving device and the lever to any one of the front mold mounting plate, the rear mold mounting plate, and the front surface of the rear plate, the driving device does not protrude rearward from the rear plate. As a result, the parts of the extruder can be placed close to the rear side of the rear plate. For example, the swinging fulcrum of the extruder can be placed at an appropriate position, and the swinging operation of the extruder can be smoothly performed with a small force. Can be done.
[0036]
Furthermore, if the driving device is fixed to one of the pair of mold mounting plates, a member such as a long locking bar for transmitting the driving force of the driving device can be virtually omitted, and the driving device can be driven. It is eliminated that the reaction force of the pulling force by the apparatus acts on the mold clamping mechanism via the rear plate. As a result, it is possible to reduce the capacity and size of the mold clamping mechanism.
[0037]
Also, The drive device includes a support, an electric motor fixed to the support, a screw member that is rotationally driven by the electric motor, and a nut member that is irreversibly screwed to the screw member. Since the screw member and the nut member are irreversibly screwed, even if the electric motor is stopped, the nut member does not rotate and the mold clamping force does not decrease. As a result, when the mold closing operation of the mold is completed, the electric motor can be stopped, and it is not necessary to separately provide a loosening prevention means in the driving device. Therefore, the drive device only needs to be driven for a short time so that a predetermined clamping force can be obtained when the mold is closed, and only for a short time to return the nut member when the mold is opened. To help. In addition, the noise associated with the drive is small, the molded product and the work environment are not contaminated, temperature dependence is eliminated, and precise control with less reliable operation and operation error becomes possible.
[0038]
Furthermore, compared with the one using a cylinder device, maintenance, work loss and cost can be reduced, and the operating rate can be improved. In particular, in the case where the cylinder device is provided in the middle of the rocking bar as in the conventional example, a biased load acts on the sliding portion of the cylinder device and tends to wear out early. On the other hand, not only when the driving device is fixedly provided on the mold mounting plate, but also when the driving device is fixedly provided on the rear plate, it is possible to prevent premature wear due to the action of the eccentric load. it can. By selecting the pitch of the screw member and the nut member, high output can be easily obtained. By adding a torque limiting mechanism to the electric motor, the required output can be set arbitrarily and easily.
[0039]
(3) Request Item 4 According to the invention, since the screw member is rotatably supported by the thrust bearing provided on the support, the pulling force for mold clamping is supported by the thrust bearing and does not act on the driving source. As a result, precise control is possible and the durability of the drive source is improved.
[0040]
(4) Request Item 6 According to the present invention, the nut member rotating stop means is provided, and only the nut member can be moved back and forth. As a result, the nut member can be accurately moved back and forth by the rotational movement of the screw member.
[Brief description of the drawings]
FIG. 1 is a side view showing a partial cross section of a main part of a mold clamping device of a hollow molding machine according to an embodiment of the present invention.
FIG. 2 is also an explanatory diagram of operation.
FIG. 3 is a cross-sectional view showing the main part of the drive device.
FIG. 4 is an explanatory view for showing a first operating part and a second operating part of the lever.
FIG. 5 is a plan view schematically showing a mold clamping device of the same hollow molding machine.
FIG. 6 is a side view schematically showing a mold clamping device of the hollow molding machine.
[Explanation of symbols]
1 Locking mechanism
2 hook
3,4 clamp
3a, 4a long hole (clamp opening / closing mechanism)
5 Drive unit
6 Locking bar
30 Fixing block
31, 32 pins
33, 34 Guide pin (Clamp opening / closing mechanism)
36 Elastic body
41 Support material (support)
41a Guide part (rotation stop means)
42 Nut member
46, 47 Spherical washer (engaged part)
48 Setting nut (engaged part)
50 Drive mechanism
51 Screw member
52 Drive source (electric motor)
53 Thrust bearing
54 cases (support)
58 Spacer
60 mold
61 Mold
62 Clamping mechanism
68 Setting nut (engaged part)
70 Front mold mounting plate
71 Rear plate
72 Rear mold mounting plate
77 fulcrum
78 lever
78a 1st operation part
78b Second working part
80 rod

Claims

Slide freely on rod (80), front mold mounting plate (70) and mold (60) attached to rod (80), rear plate (71) attached to rod (80), and rod (80) A pair of molds by enlarging and reducing the distance between the supported rear mold mounting plate (72) and mold (61) and the rear mold mounting plate (72) and rear plate (71). A mold clamping mechanism (62) for performing mold closing and mold opening of (60, 61) ,
The hook (2) attached to one of said mold mounting plate (70, 72), attached to the other of said mold mounting plate (72, 70) is opened and closed by the clamp opening and closing mechanism (33,34,3A, 4a) The clamp (3,4) and the other mounting plate (72, 70) and rear plate (71) are fixedly supported by the drive device (5) and the fulcrum (77) that are fixedly mounted on one of the rear plate (71). Lever (78) to be provided,
The drive device (5) operates the first operating portion (78a) of the lever (78), and the second operating portion (78b) of the lever (78) operates the clamp opening / closing mechanism (33, 34, 3a, 4a). The clamp (3, 4) is closed, and the hook (2) is engaged and held by the clamp (3, 4). ) was引動second actuating unit by the (78b) of the mold ShimeSo location of the air forming machine in which the so that cause predetermined clamping force,
Said clamp (3, 4), while being swingably pin-connected to the fixed block (30),
The drive device (5) is fixed to the support (41, 54) and the support (41, 54) fixed to either the other mold mounting plate (72, 70) or the rear plate (71). An electric motor (52), a screw member (51) that is rotationally driven by the electric motor (52), and a nut member (42) that is irreversibly screwed to the screw member (51),
When the mold (60, 61) is opened, the screw member (51) is rotationally driven by the electric motor (52), and the movement of the nut member (42) causes the first operating portion (78a) of the lever (78) and The second actuating part (78b) is operated to move the fixing block (30), and the clamps (3,4) are opened by the operation of the clamp opening / closing mechanism (33, 34, 3a, 4a) and the hook (2) The engagement grip is released,
When the molds (60, 61) are closed, the screw member (51) is reversely driven by the electric motor (52), and the first actuating portion (78a) of the lever (78) is moved by the movement of the nut member (42). And the second actuating part (78b) is operated to move the fixing block (30), and the clamps (3,4) are closed by the operation of the clamp opening / closing mechanism (33, 34, 3a, 4a) and the hook (2 ) is mold clamping device of the air-molding machine in you, characterized in that it is engaged gripped.

Slide freely on rod (80), front mold mounting plate (70) and mold (60) attached to rod (80), rear plate (71) attached to rod (80), and rod (80) A pair of molds by enlarging and reducing the distance between the supported rear mold mounting plate (72) and mold (61) and the rear mold mounting plate (72) and rear plate (71). In a mold clamping device of a hollow molding machine provided with a mold clamping mechanism (62) for performing mold closing and mold opening of (60, 61),
A hook (2) for mounting on the front mold mounting plate (70), a clamp (3,4) for mounting on the rear mold mounting plate (72), and a drive device (5) fixed on the rear plate (71) The rear plate (71) is provided with a lever (78) that is swingably supported by the fulcrum (77),
The clamps (3, 4) are pivotally coupled to the fixing block (30), and the locking bar (6) is connected to the fixing block (30). (78a) is operated to swing the lever (78), and the second actuating part (78b) of the lever (78) moves the locking bar (6) and the fixing block (30),
The drive device (5) is rotationally driven by the support (41, 54) fixed to the rear plate (71), the electric motor (52) fixed to the support (41, 54), and the electric motor (52). A screw member (51) and a nut member (42) that is irreversibly screwed to the screw member (51),
When the mold (60, 61) is opened, the fixing block (30) and the locking bar (6) urged by the elastic body (36) move forward, and the clamp opening / closing mechanism (33, 34, 3a) 4a), the clamps (3, 4) are opened to release the engaging grip of the hook (2), and the nut member (42) is engaged with the first operating portion (78a) of the lever (78). The engagement is released, and the locking of the second operating part (78b) of the lever (78) and the locking bar (6) is released,
When the mold (60, 61) is closed, the nut (42) is engaged with the first actuating part (78a) of the lever (78) by the operation of the driving device (5), so that the lever (78) The second operating portion (78b) of the lever (78) is locked to the locking bar (6), and the elastic body (36) is compressed while the locking bar (6) and the fixing block (30 ) Moves backward, and the clamp (3,4) is closed by the operation of the clamp opening and closing mechanism (33, 34, 3a, 4a), the hook (2) is engaged and held, and the hook (2) is engaged. A mold clamping device for a hollow molding machine, wherein the clamps (3, 4) gripped are moved to generate a predetermined clamping force.

3. A hollow molding machine according to claim 2, wherein a spacer (58) having a predetermined thickness is provided to adjust a relative position between the nut member (42) and the first operating portion (78a) of the lever (78). Mold clamping device.

4. The mold clamping apparatus for a hollow molding machine according to claim 1, wherein the screw member (51) is rotatably supported by a thrust bearing (53) provided on the support (41, 54).

Spherical washers (46, 47) are provided on the first actuating part (78a) and the second actuating part (78b) of the lever (78), respectively, and engage with the first actuating part (78a) of the lever (78). An engaged portion (47) for engaging the engaged portions (46, 48) of the nut member (42) and the second operating portion (78b) of the lever (78) to move the fixing block (30). , 68). The mold clamping device for a hollow molding machine according to claim 1, 2, 3 or 4 .

The hollow molding machine according to claim 1, 2, 3, 4 or 5, wherein a rotation stop means (41a) for the nut member (42) is provided, and the nut member (42) can only move back and forth. Clamping device.