JP3783344B2

JP3783344B2 - Synthetic resin pipe manufacturing equipment

Info

Publication number: JP3783344B2
Application number: JP17256897A
Authority: JP
Inventors: 勝年山本; 真二大野
Original assignee: Daikin Industries Ltd
Current assignee: Daikin Industries Ltd
Priority date: 1997-06-27
Filing date: 1997-06-27
Publication date: 2006-06-07
Anticipated expiration: 2017-06-27
Also published as: JPH1120011A

Description

【０００１】
【発明の属する技術分野】
本発明は、合成樹脂製管の製造方法および装置に関し、特にポリテトラフルオロエチレン重合体（略称ＰＴＦＥ）製管を原材料として、膨張させて拡径して多孔質熱収縮性管を製造するために好適に実施することができる装置に関する。
【０００２】
【従来の技術】
バッチ式で合成樹脂製管を製造する装置の先行技術は、特開昭６２−２７９９２０に開示されている。図２４（ａ）はその構成を示す断面図である。合成樹脂製管、たとえばＰＴＦＥ管２は、両端部に鞘管８を嵌め金型４に挿入され、金型４の両端は支持金具５によって鞘管８に固定される。この状態で管２の一方端に圧縮ガス流入口９のある取付治具６、他方端に栓１０のある取付治具７を取付け、全体を管２の軟化点以上かつ溶融点未満に加熱し、圧縮ガス流入口９から圧縮ガスを供給する。圧縮ガスによって支持金具５間の管２が金型３に接触するように拡径されて多孔性となり、図２４（ｂ）の形状の管が得られる。鞘管８が嵌まっていた両端部３を切断して製品１が得られる。
【０００３】
前記先行技術の装置では鞘管８を用いるため、管の両端部３が無駄になり、また製品は１本ずつ製造されるため、量産に不向きであるという問題がある。
【０００４】
【発明が解決しようとする課題】
本発明の目的は、原材料となる合成樹脂製管の無駄をなくして歩留りを向上することができ、また量産を可能にした合成樹脂製管の製造装置を提供することである。
【００１５】
【課題を解決するための手段】
本発明は、直線状軸線を有する筒状の金型と、
金型内に、金型の軸線方向の移動を阻止されて設けられ、合成樹脂製の管の一端部を着脱可能に保持し、前記管の一端部に連通する通路が形成される保持手段と、
金型内に、金型の軸線方向に移動自在に設けられ、管の他端部を閉塞する移動体と、
保持手段の通路に圧縮流体を供給する圧縮流体供給手段とを含み、
保持手段は、
固定側ホルダと、
固定側ホルダに着脱可能な保持部材とを含み、
固定側ホルダは、
金型の内周面にごく近接しまたは当接する支持部を有し、
金型の軸線と同一直線上に軸線を有し、移動体から遠去かるにつれて内径が大きくなる固定側保持孔が形成され、
保持部材は、
固定側保持孔内に嵌合し、移動体に近付くにつれて外径が小さくなる固定側嵌合突部を有し、
嵌合突部には、移動体側に開口した圧縮流体を供給する通路が形成され、
固定側ホルダの移動体とは反対側の端部で、固定側ホルダと保持部材とがねじ結合されて、
固定側保持孔と固定側嵌合突部との間で、前記管の前記一端部を挟持することを特徴とする合成樹脂製管の製造装置である。
【００１６】
本発明に従えば、筒状金型と保持手段と移動体とは、金型装置を構成し、保持手段の通路に圧縮流体供給源から圧縮流体を供給することによって、その保持手段に一端部が保持された合成樹脂製管が膨張し、前述と同様に管の外周面が金型の内周面に当接して膨張して拡径されるとともに、その管が長手方向に伸び、その長手方向の膨張分が、移動体の移動によって吸収される。
また、金型内で合成樹脂製管の一端部を、金型の軸線方向に移動しないように、かつ着脱可能に保持する保持手段では、管の一端部内に保持部材の固定側嵌合突部が装入され、管の一端部の外周面が固定側ホルダの固定側保持孔の内周面に押付けられて挟持され、固定側ホルダと保持部材とがねじ結合されることによって、前記管の一端部を保持手段に強固に取付けることができる。またこのねじ結合を外すことによって、拡管作業後に、その管の一端部を保持手段から容易に取外すことができる。
固定側ホルダにめねじが刻設され、保持部材におねじが刻設されて螺合する構成であってもよく、または固定側ホルダにおねじを刻設し、保持部材にめねじを刻設して螺合する構成としてもよい。これらめねじおよびおねじは、固定側ホルダおよび保持部材の共通の軸線上に、軸線をそれぞれ有する。
【００２０】
また本発明は、保持手段は、
保持部材の移動体とは反対側の端部に固定され、金型内に挿入可能な圧縮流体供給管と、
金型内で、圧縮流体供給管をその圧縮流体供給管の軸線が保持部材の軸線と同一直線上に存在するように支持するとともに、金型内への挿入長さを調整可能にして金型に固定する取付け部材とをさらに含むことを特徴とする。
【００２１】
本発明に従えば、保持部材には、剛性の圧縮流体供給管の一端部が固定され、この圧縮流体供給管の直線状長手方向の途中位置を金型の端部に取外し可能に固定し、たとえばこのような構造によって、保持部材の金型内への装入長さを調整可能とすることができる。したがって拡管して得られる管の長さに応じて、保持部材の位置を調整することができる。
【００２２】
また本発明は、移動体は、
移動側ホルダと、
移動側ホルダに着脱可能な閉塞部材とを含み、
移動側ホルダは、
金型の内周面にごく近接しまたは当接する支持部を有し、
金型の軸線と同一直線上にある軸線を有し、前記保持手段から遠去かるにつれて内径が大きくなる移動側保持孔が形成され、
閉塞部材は、
移動側保持孔内に嵌合し、前記保持手段に近付くにつれて外径が小さくなる移動側嵌合突部を有し、
移動側ホルダの前記保持手段とは反対側の端部で、移動側ホルダと閉塞部材とがねじ結合されて、
移動側保持孔と移動側嵌合突部との間で前記管の他端部を挟持することを特徴とする。
【００２３】
本発明に従えば、閉塞部材の移動側嵌合突部を、原材料となる管の他端部に装入し、この管の他端部の外周面を移動側ホルダに形成された移動側保持孔の内周面に押付けて挟持し、移動側ホルダと閉塞部材とのねじ結合によって強固に固定することができる。
【００２４】
前記固定側ホルダには支持部が形成され、また移動側ホルダにも同様の支持部が形成され、これによって管の軸線を金型の軸線にほぼ一致した状態で、その管を拡径することができる。したがって製品の管の厚みおよび細孔が、周方向および軸線方向にほぼ均一にすることができ、品質の向上を図ることができる。
【００２５】
支持部は、周方向に連続したたとえば円柱状または円筒状に形成されてもよいけれども、本発明の実施の他の形態では、周方向に間隔をあけて少なくとも３箇所で金型の内周面にごく近接し、または当接する摺動突起などによって実現されてもよく、この摺動突起は、軸線まわりに１２０°ずつ間隔をあけて形成されてもよい。
また本発明は、直線状軸線を有する筒状の金型と、
金型内に、金型の軸線方向の移動を阻止されて設けられ、合成樹脂製の管の一端部を着脱可能に保持し、前記管の一端部に連通する通路が形成される保持手段と、
金型内に、金型の軸線方向に移動自在に設けられ、管の他端部を閉塞する移動体と、
保持手段の通路に圧縮流体を供給する圧縮流体供給手段とを含み、
移動体は、
移動側ホルダと、
移動側ホルダに着脱可能な閉塞部材とを含み、
移動側ホルダは、
金型の内周面にごく近接しまたは当接する支持部を有し、
金型の軸線と同一直線上にある軸線を有し、前記保持手段から遠去かるにつれて内径が大きくなる移動側保持孔が形成され、
閉塞部材は、
移動側保持孔内に嵌合し、前記保持手段に近付くにつれて外径が小さくなる移動側嵌合突部を有し、
移動側ホルダの前記保持手段とは反対側の端部で、移動側ホルダと閉塞部材とがねじ結合されて、
移動側保持孔と移動側嵌合突部との間で前記管の他端部を挟持することを特徴とする合成樹脂製管の製造装置である。
本発明に従えば、筒状金型と保持手段と移動体とは、金型装置を構成し、保持手段の通路に圧縮流体供給源から圧縮流体を供給することによって、その保持手段に一端部が保持された合成樹脂製管が膨張し、前述と同様に管の外周面が金型の内周面に当接して膨張して拡径されるとともに、その管が長手方向に伸び、その長手方向の膨張分が、移動体の移動によって吸収される。
また、閉塞部材の移動側嵌合突部を、原材料となる管の他端部に装入し、この管の他端部の外周面を移動側ホルダに形成された移動側保持孔の内周面に押付けて挟持し、移動側ホルダと閉塞部材とのねじ結合によって強固に固定することができる。
【００２６】
また本発明は、金型には、前記移動体に当接して、金型の軸線に沿う前記管の他端部の移動長さを制限するストッパが、金型の軸線方向に変位調整可能に設けられることを特徴とする。
【００２７】
本発明に従えば、原材料となる管の他端部を閉塞する移動体の軸線方向の移動長さが、ストッパによって制限され、これによって同一の金型で製品の軸線方向の長さを希望する値に設定することができ、製品ごとのばらつきをなくすことができ、品質が向上されることになる。
【００２８】
また本発明は、（ａ）金型装置であって、
直線状軸線を有する筒状の金型と、
金型内に、金型の軸線方向の移動を阻止されて設けられ、合成樹脂製の管の一端部を、着脱可能に保持し、その管の前記一端部の連通する通路が形成される保持手段と、
金型内に、金型の軸線方向に移動自在に設けられ、管の他端部を閉塞する移動体とを有する金型装置と、
（ｂ）加熱炉であって、
金型装置が装入される入口と金型装置が排出される出口とが形成された炉体と、
炉体内で金型装置を入口から出口に搬送する搬送手段と、
炉体内の金型装置を搬送手段による搬送中に加熱する加熱手段とを有する加熱炉と、
（ｃ）金型装置を加熱炉の入口に個別的に装入する手段と、
（ｄ）金型装置を加熱炉の出口から個別的に取出す取出し手段と、
（ｅ）取出し手段によって加熱炉の出口から取出された金型装置を冷却する冷却手段と、
（ｆ）取出し手段および冷却手段の近傍に設けられ、取出し手段によって加熱炉の出口から個別的に取出された金型装置の保持手段の通路に、少なくとも金型装置が冷却手段によって冷却されるまで、圧縮流体を供給する圧縮流体供給手段とを含むことを特徴とする合成樹脂製管の製造装置である。
【００２９】
本発明に従えば、筒状金型と保持手段と移動体とを含む金型装置を、装入手段によって加熱炉の炉体内に装入し、炉体内で金型装置が入口から出口にわたって搬送される間に、加熱手段によって加熱され、したがってその金型装置内の原材料である熱可塑性合成樹脂製管が軟化点以上、熔融点未満の温度に加熱され、その後、金型装置が炉体の出口から取出し手段によって取出され、金型装置の保持手段の通路に、圧縮流体が圧縮流体供給手段から供給され、これによって管が膨張して拡管されて成形され、この状態で、冷却手段によって軟化点未満のたとえば常温に冷却される。こうして自動的に、またはほぼ自動的に、製品を量産することができる。
【００３０】
また本発明は、加熱炉の搬送手段は、
加熱炉の入口と出口との間にわたって張架される無端状環状の索条と、
索条を、一方向に走行駆動する駆動手段と、
索条の長手方向に間隔をあけて設けられ、加熱炉の入口から出口にわたって金型をほぼ水平な姿勢で受けて支持するほぼＣ字状断面を有する複数の受け具とを含むことを特徴とする。
【００３１】
本発明に従えば、チエンなどの索条が駆動手段によって駆動されて加熱炉の入口から出口にわたって無端環状に巻掛けられて設けられ、この索条には、ほぼＣ字状断面を有する複数の受け具が取付けられ、金型をほぼ水平な姿勢で、すなわち金型の軸線がほぼ水平となるようにして受けて支持する。この構成を有する受け具によれば、管の入口からの装入支持および出口からの取外し排出が容易であり、自動化を図ることが容易である。
【００３４】
また本発明は、索条は、加熱炉の入口および出口で、上下に延びる張架部分を、それぞれ有し、
入口付近では、上昇し、出口付近では、下降する方向に走行駆動され、
装入手段は、
加熱炉の入口に近付くにつれて下方に傾斜した乗載面を有し、この乗載面上に、金型装置をほぼ水平な姿勢でかつ隣接して乗載する案内部材と、
案内部材に、乗載面の下端部で固定され、金型装置の変位を制限する突片とを有し、
受け具は、
索条の走行方向下流側の下流側受け部と、
上流側の上流側受け部とを有し、
索条の走行方向と前記管の軸線とに交差する方向に、下流側受け部の遊端部よりも、上流側受け部の遊端部が突出しており、
加熱炉の入口付近で、上流側受け部の遊端部で、前記乗載面上の突片で変位が制限されている金型装置を、索条の上昇時に、下方から受けることを特徴とする。
【００３５】
本発明に従えば、装入手段における案内部材の乗載面上には、複数の金型装置がほぼ水平な姿勢でかつ隣接して乗載され、この乗載面は、加熱炉の炉体の入口に近付くにつれて下方に傾斜しているので、乗載面上を摺動して金型装置が入口にもたらされ、乗載面の下端部では、その最も下の金型装置の変位を制限するために突片が設けられ、炉体内で、前述のようにほぼＣ字状断面を有する受け具は、入口付近で上昇する索条に設けてある受け具の上流側受け部で、乗載面上の突片で変位が制限されている１つの金型装置を受けて上昇して取込む。
【００３６】
索条の入口付近で上昇する張架部分では、上流側受け部の遊端部は、下流側受け部の遊端部よりも突出しており、したがって案内部材の乗載面に乗載して突片によって変位が制限されている１つの金型装置は、下流側受け部の遊端部が衝突したり接触したりすることはなく、上流側受け部の遊端部でその１つの金型装置を下方から受取って装入することが確実である。
【００３７】
また本発明は、取出し手段は、
加熱炉の出口付近で、下流側受け部で支持されている金型装置を受ける上方に開放した取出し受け具と、
取出し受け具が一端部に設けられるアームと、
アームを、索条の走行方向と前記管の軸線とに交差する方向に、往復変位する横方向駆動手段とを含むことを特徴とする。
【００３８】
本発明に従えば、加熱炉の炉体の出口付近では、索条は下降しており、この状態では金型装置は受け具の下流側受け部で支持されており、この出口付近で横方向駆動手段によって往復変位可能なアームの一端部である遊端部には、上方に開放した取出し受け具が設けられ、前記下流側受け部で支持されている金型装置を、取出し受け具で受け、その受けた状態で受け具の下降通過軌跡の範囲から外方に、横方向駆動手段の働きによって取出す。こうして加熱された金型装置を加熱炉の出口から自動的に取出すことが可能となる。
【００３９】
また本発明は、冷却手段は、
アームの下方に配置され、冷却液を貯留する貯留槽と、
アームの他端部を、水平軸線まわりに往復角変位駆動して取出し受け具に支持されている金型装置を、冷却液に浸漬し、および冷却液から上方に取出す角変位駆動手段とを含むことを特徴とする。
【００４０】
本発明に従えば、取出し受け具で受けられた加熱されている金型装置を、前述のように圧縮流体を供給した状態のままで、アームが角変位駆動手段によって角変位されて貯留槽内の冷却液、たとえば水に、浸漬されて冷却される。したがって効率良く金型装置の冷却を行うことができる。金型装置の金型の内周面には、拡径された熱可塑性合成樹脂製管の外周面が当接した状態となっており、その拡径された管を、冷却中にも圧縮流体を供給したままに保つことによって、正確な成形加工が可能になる。
また本発明は、加熱手段は、
炉体の加熱室の上下にそれぞれ形成された開口にわたって熱風通路を形成し、
この熱風通路の途中に、加熱源と熱風を送風するファンとが設けられることを特徴とする。
本発明に従えば、たとえばガス燃料または液体燃料を用いるガスバーナなどの加熱源によって得られる熱風をファンで送風し、炉体の加熱室の上下に形成された開口を通じて加熱室内を循環する。こうして加熱室内で金型装置を均一に加熱することができる。熱風通路からの加熱された熱風は、加熱室のたとえば下の開口から加熱室に供給し、加熱室の上部の開口から、加熱室内のガスを、熱風通路を経て加熱源に導くようにして循環してもよい。
また本発明は、前記合成樹脂製の管が多孔性であることを特徴とする。
本発明の合成樹脂製管は、無孔性または多孔性のいずれでもよいが、多孔性管が好ましい。
また本発明は、前記管は、ポリテトラフルオロエチレン重合体から成り、
得られる管が、径方向に熱収縮性を有することを特徴とする。
本発明に従えば、管の材料としてＰＴＦＥを用い、この材料としては、テトラフルオロエチレン単独重合体のみならず、２重量％以下（特に好ましくは、０．０１〜１重量％）の共重合可能なモノマを共重合体させることによって得られるいわゆる変性ポリテトラフルオロエチレンを含む。前記共重合モノマとして、パーフルオロアルキルビニルエーテル、クロロトリフルオロエチレン、ヘキサフルオロプロピレン等が挙げられる。本発明では、このＰＴＦＥをペースト押出成形し得られる管を焼結した後、原料合成樹脂製管として使用することが好ましい。
加熱温度は、たとえば９０℃〜２５０℃であってもよく、圧縮流体の圧力は、たとえば２〜１０ｋｇ／ｃｍ ² であってもよい。前記管の他端部は、後述の移動体によって閉塞されてもよいけれども、このような移動体が設けられることなく、閉塞されていてもよい。
【００４１】
【発明の実施の形態】
図１は、本発明の実施の一形態の金型装置３１の簡略化した断面図である。図１に示されるように、原材料となる合成樹脂製管３０の長手方向（図１の左右方向）の一端部３２が固定され、他端部３３が金型３４内でその軸線３５方向に前記一端部３２から遠去かる方向（図１の右方）に変位可能に設けられる。管３０が軟化点以上、溶融点未満の温度で加熱され、圧縮ガスが前記一端部３２から供給されることによって、図２に示されるようにその管３０が径方向に拡がり、しかも軸線方向に伸び、膨張して多孔性に成形される。この図２の膨張した状態で、冷却することによって、拡径された製品である管３０ａを得ることができる。
【００４２】
金型３４は、筒状であり、たとえばこの実施の形態では直円筒状であって、その内径は軸線３５に沿って一様であり、軸線３５は直線状である。金型３４内には、保持手段３６が、その軸線３５の方向の移動を阻止されて設けられ、この保持手段３６に、管３０の一端部３２が着脱可能に保持される。金型３４内では、管３０の他端部３３を閉塞して着脱可能に取付けられる移動体３７が、金型３４の軸線３５の図１における右方に移動自在に設けられる。保持手段３６は、剛性のほぼ直円筒状に形成された圧縮ガス供給管３８を有する。この圧縮ガス供給管は、取付け部材３９によって金型３４の一端部４０付近で、その圧縮ガス供給管３８の金型３４内への装入長さを調整可能にして金型３４の前記一端部４０に固定する。金型３４の他端部４１には、ストッパ４２が、もう１つの取付け部材４３によって変位調整可能に設けられる。ストッパ４２は、金型３４の軸線３５に沿う管３０の前記他端部３３、したがって移動体３７の移動長さを制限する。
【００４３】
図２では、移動体３７がストッパ４２に当接してその変位が制限されている状態が示されている。この金型装置３１は、軸線３５に関してほぼ線対称に構成される。
【００４４】
図３は、保持手段３６付近の図１における一部の拡大断面図である。金型３４の一端部４０には、取付け部材３９が取外し可能に固定され、この取付け部材３９に、圧縮ガス供給管３８が変位調整可能に取付けられる。保持手段３６は、固定側ホルダ４４と、固定側ホルダ４４に着脱可能な保持部材４５とを含み、さらに前述の圧縮ガス供給管３８を含む。
【００４５】
図４は、金型３４の一端部４０付近に取付けられた取付け部材３９付近の断面図である。取付け部材３９には、前記一端部４０を収納する収納孔４６と、その収納孔４６よりも小径の挿通孔４７とが形成される。挿通孔４７には、圧縮ガス供給管３８が挿通される。この取付け部材３９には、収納孔４６の位置に対応して１または複数（この実施の形態ではたとえば２）のボルト４８が螺着される。このボルト４８の先端部は、収納孔４６内の金型３４の一端部４０の外周面に当接して着脱可能に取付け部材３９が前記一端部４０に取付けられる。
【００４６】
取付け部材３９にはさらに複数（この実施の形態では２）のボルト４９が螺着される。このボルト４９の挿通孔４７に臨む端部は、圧縮ガス供給管３８の外周面に当接し、圧縮ガス供給管３８の軸線方向の変位を阻止するように取外し可能に固定する。収納孔４６の内径は、金型３４の一端部４０の外径よりもわずかに小さく、また挿通孔４７の内径は圧縮ガス供給管３８の外径よりもわずかに大きく、これによって金型３４内の空気などのガスが、それらの隙間を経て大気放散されることができ、成形を円滑に行うことができる。取付け部材３９は圧縮ガス供給管３８の軸線が金型３４の軸線３５に一致するように保持する。
【００４７】
図５は、保持手段３６の構成を示す断面図である。固定側ホルダ４４は、その軸線方向両端部に支持部５１をそれぞれ有する。保持部材４５もまた、支持部５２を有する。これらの支持部５１，５２は、その径が金型３４の内径とほぼ等しいかわずかに小さく、したがってその支持部５１，５２は、金型３４の内周面にごく近接しまたは接触し、これによって保持手段３６の軸線５７は、金型３４の軸線３５に一致するように、保たれる。
【００４８】
固定側ホルダ４４には、移動体３７寄り（図５の右方）に管３０の一端部３２が挿通される固定側挿通孔５３が形成され、さらにこの挿通孔５３に連なる固定側保持孔５４が形成される。固定側保持孔５４は、移動体３７から遠去かるにつれて（すなわち図５の左方になるにつれて）、内径が大きく形成される中空円錐台状に形成される。挿通孔５３と固定側保持孔５４とは、軸線５７と同軸である。固定側ホルダ４４には、固定側保持孔５４に連なりそれよりも大きい内径を有するめねじ５５ａが形成される。
【００４９】
保持部材４５は、固定側保持孔５４内に嵌合する固定側嵌合突部５６を有し、さらにこの嵌合突部５６の基端部に連なって形成されるおねじ５５ｂを有する。おねじ５５ｂは、固定側ホルダ４４のめねじ５５ａに着脱可能に螺合する。こうして固定側ホルダ４４と保持部材４５とがねじ結合される。
【００５０】
嵌合突部５６は、移動体３７に近付くにつれて（すなわち図５の右方になるにつれて）、外径が小さくなるように、円錐台状に形成される。保持孔５４の内周面および嵌合突部５６の外周面の軸線５７と成す角度は、たとえば３度のテーパがつけられている。保持孔５４に挿入された管３０の一端部３２内に嵌合突部５６が挿入され、その嵌合突部５６の外周面と保持孔５４の内周面との間で前記管３０の一端部３２が挟持され、保持部材４５を締付けることによって、前記管３０の一端部３２が固定側ホルダ４４に強固に固定されることができる。
【００５１】
保持部材４５の嵌合突部５６と反対側の端部には、めねじ５８が形成される。圧縮ガス供給管３８の端部に形成されたおねじ５９が、前記めねじ５８に螺合されて、保持部材４５に圧縮ガス供給管３８が同軸に固定される。
【００５２】
保持部材４５には、同軸の通路６０が形成される。これによって圧縮ガス供給管３８からの圧縮ガスは、通路６０を経て嵌合突部５６内から管３０の一端部３２内に供給される。
【００５３】
固定側ホルダ４４の挿通孔５３の移動体３７寄りの端部には、同軸の中空円錐台状の案内面６１が形成される。これによって管３０の一端部３２が径方向に円滑に膨張されることができる。
【００５４】
図６は、移動体３７の具体的な構成を示す断面図である。移動体３７は、移動側ホルダ６３と、閉塞部材６４とを含む。移動側ホルダ６３は、その軸線方向両端部に支持部６５をそれぞれ有する。閉塞部材６４もまた、支持部６６を有する。これらの支持部６５，６６は、その径が金型３４の内径よりわずかに小さく、したがってその支持部６５，６６は金型３４の内周面に近接し、これによって移動体３７は、金型３４の軸線３５に沿って移動可能である。
【００５５】
移動側ホルダ６３には、保持手段３６寄り（図６の左方）に管３０の他端部３３が挿通される移動側挿通孔６７が形成され、さらにこの挿通孔６７に連なる移動側保持孔６８が形成される。移動側保持孔６８は、保持手段６７に遠ざかるにつれて（図６の右方になるにつれて）、内径が大きく形成される中空円錐台状に形成される。挿通孔６７と保持孔６８とは、移動体３７の軸線６９と同軸である。移動側ホルダ６３には、保持孔６８に連なりそれよりも大きい内径を有するめねじ７０が形成される。
【００５６】
閉塞部材６４は、前記保持孔６８に嵌合する閉塞側嵌合突部７１を有し、この嵌合突部７１の基端部に連なって形成されるおねじ７２を有する。おねじ７２は、前記めねじ７０と螺合されて、移動側ホルダ６３と閉塞部材とが結合される。
【００５７】
嵌合突部７１は、保持手段３６に近付くにつれて（図６の右方になるにつれて）、外径が小さくなるように、円錐台状に形成される。保持孔６８の内周面および嵌合突部７１の外周面の軸線６９と成る角度は、たとえば３度のテーパがつけられている。保持孔６８に挿入された管３０の他端部３３内に嵌合突部７１が挿入され、その嵌合突部７１の外周面と保持孔６８の内周面との間で管３０の他端部３２が挟持され、閉塞部材６４を締付けることによって管３０の他端部３３が移動体３７に強固に固定される。
【００５８】
移動側ホルダ６３の挿通孔６７の保持手段３６寄りの端部には、同軸の中空円錐台状の案内面７３が形成される。これによって管３０の他端部３３が径方向に円滑に膨張される。
【００５９】
図７は、金型３４の他端部４１付近の断面図である。金型３４の他端部４１には、取付け部材４３が取付けられ、取付け部材４３にはさらにストッパ４２が固定されている。取付け部材４３には、前記他端部４１を収納する収納孔７６と、その収納孔７６よりも小径の挿通孔７７とが形成される。挿通孔７７には、ストッパ４２の位置を調整する円筒状の調整部材８３が挿通される。この取付け部材４３には、収納孔７６の位置に対応して１または複数（この実施の形態ではたとえば２）のボルト７８が螺着される。このボルト７８の先端部は、収納孔７６内の金型３４の他端部４１の外周面に当接して着脱可能に取付け部材４３が前記他端部４１に取付けられる。
【００６０】
取付け部材４３にはさらに複数（この実施の形態では２）のボルト７９が螺着される。このボルト７９の挿通孔７７に臨む端部は、調整部材８３の外周面に当接し、調整部材８３の軸線方向の変位を阻止するように取外し可能に固定する。収納孔７６の内径は、金型３４の他端部４１の外径よりもわずかに小さく、また挿通孔７７の内径は調整部材８３の外径よりもわずかに大きく、これによって金型３４内の空気などのガスが、それらの隙間を経て大気放散されることができ、成形を円滑に行うことができる。
【００６１】
取付け部材４３は、調整部材８３の軸線が金型３４の軸線３５に一致するように保持する。ストッパ４２は、調整部材８３の先端に溶接などによって一体的に形成される。
【００６２】
図８は、前記図２において形成され冷却された後の管３０ａを取出して製品３０ｂに仕上げるときの作業を説明するための工程図である。取付け部材３９を金型３４から外し、管３０ａは金型３４の一端４０から抜出される。この状態は図８（１）に示される。次に管３０ａの他端３３を切断して、他端側から管３０ａの形状を保持するために、円筒状に丸めた紙８５を管３０ａの一端３２の近傍まで挿入する。この状態が図８（２）に示される。次に管３０ａの一端側を切断する。製品３０ｂは、円筒状の紙で型が挿入されたままで図８（３）に示すように保管される。
【００６３】
図９は、本発明の実施の一形態の合成樹脂製管の製造装置の一部の構成要素をなす加熱炉１１６の簡略化した斜視図である。加熱炉１１６の炉体１１７には、金型装置３１が装入される入口１１８とその金型装置３１が排出される出口１１９とが、対向する各壁１２０，１２１にそれぞれ形成される。炉体１１７の隔壁１２２には、加熱手段１２３が装着される。この加熱手段１２３は、隔壁１２２の上部に形成された開口１２４から加熱室１２５内の空気などのガスを吸引し、加熱源１２６によって加熱し、ファン１２７によって送風し、その熱風は、底部１２９に形成された開口１３０から加熱室１２５内に噴出する。こうして加熱室１２５内のガスが循環され、加熱室１２５内で、金型装置３１、したがって原材料となる管３０が加熱される。
【００６４】
図１０は、加熱炉１１６とその入口１１８に設けられてその入口１１８に金型装置３１を個別的に装入する装入手段１３１と、出口１１９に連なって設けられ、出口１１９から加熱された金型装置３１を個別的に取出すとともに、その取出された金型装置３１を冷却する取出し・冷却手段１３２とを示す断面図である。さらに図１１は加熱炉１１６と装入手段１３１と取出し・冷却手段１３２とを示す平面図であり、図１２は加熱炉１１６の側面図であって、この図１２は、加熱手段１２３と搬送手段１３４の駆動手段１３５を示す。加熱炉１１６の炉体１１７における対向する壁１２０，１２１には、入口１１８と出口１１９の上方で鉛直軸線まわりに開閉可能な扉１３６，１３７が設けられ、その開閉状態は、図１１において参照符１３８，１３９でそれぞれ示される。装入手段１３１から装入される金型装置３１は、１つずつ搬送手段１３４によって受取られて装入され、その搬送手段１３４によって加熱室１２５を搬送される間に、加熱される。加熱された金型装置３１は、取出し・冷却手段１３２の図１０における参照符１４０で示されるようにして取出し受け具１４１で受けられ、出口１１９から取出され、そのアーム１４２が図１１の仮想線１４３で示されるように傾けられて水槽１４４内の冷却液である水１４５内に浸漬されて冷却される。
【００６５】
図１３は、加熱室１２５内における搬送手段１３４の構成を示す断面図である。加熱炉１１６の炉体１１７の幅方向（図１３の紙面に垂直方向、図１１の上下方向）には間隔をあけて対を成す索条であるリンクチエン１４７が、無端環状に設けられ、上下のスプロケットホイル１４８，１４９；１５０，１５１と中央のスプロケットホイル１５２に、巻掛けられる。このチエン１４７は、入口１１８付近では、スプロケットホイル１４８，１５０間で上昇し、出口１１９付近ではスプロケットホイル１４９，１５１間で下降するように張架される。チエン１４７にはその長手方向に間隔をあけて受け具１５３がそのチエン１４７の長手方向に等間隔をあけて取付けられる。この受け具１５３によって、装入手段１３１から装入される金型装置３１が受けられるとともに、加熱後の金型装置が取出し受け具１４１によって自動的に取出されることを可能にする。
【００６６】
図１１では図面の便宜のために、チエン１４７および受け具１５３は図示が省略されており、スプロケットホイル１４８がそれぞれ固定される水平軸線を有する回転軸１５４〜１５８の各軸線は、添え字ａを付して、それぞれ示す。これらの各回転軸１５４〜１５８は、炉体１１７の側壁１５９と隔壁１２２を経て加熱手段１２３の側壁１６０を挿通して、外部で回転可能に支持される。
【００６７】
スプロケットホイル１５０の回転軸１５６は、側壁１６０の外方に突出し、ウォームホイル１６２に固定される。このウォームホイル１６２は、ウォーム１６３に噛合し、ウォーム１６３は、モータ１６４によって回転駆動される。こうして搬送手段１３４のチエン１４７が、長手方向に一方向に走行駆動される。
【００６８】
加熱手段１２３において隔壁１２２と側壁１６０とによって熱風通路１６６が形成される。この熱風通路１６６において、加熱源１２６の下方には、ファン１２７を構成する羽根車１６７が、配置される。羽根車１６７は、側壁１６０の外部に突出して回転自在に設けられた回転軸１６８に固定される。回転軸１６８は、チエンなどの巻掛け駆動手段１６９によってモータ１７０の動力で回転駆動される。こうして上の開口１２４から吸引された空気は、熱風通路１６６に導入され、加熱源１２６で加熱され、ファン１２７で圧送され、下の開口１２９から加熱室１２５に導入され、循環される。この熱風によって加熱室１２５内では、搬送手段１３４で搬送されている金型装置３１、したがってその内部の熱可塑性合成樹脂製管３０が加熱される。
【００６９】
図１４は装入手段１３１の側方から見た簡略化した断面図であり、図１５は装入手段１３１の平面図であり、図１６は装入手段１３１の図１５における左方から見た正面図である。これらの図面を参照して、装入手段１３１は基本的に、案内部材１７１と突片１７２とを有する。案内部材１７１は、乗載面１７３を有する。乗載面１７３は、加熱炉１１６の入口１１８に近付くにつれて（すなわち図１４および図１５の左方になるにつれて）下方に傾斜している。この乗載面１７３上に、金型装置１３１の圧縮ガス供給管３８とストッパ４２の調整棒８３とが乗載され、これによって金型装置３１はその軸線３５がほぼ水平となる姿勢で、かつ図１６の左右に隣接して乗載される。したがって金型装置３１は、乗載面１７３上で転がり、または摺動し、乗載面１７３の下端部１７４で案内部材１７１に固定された突片１７２に当接し、金型装置３１の下方（図１４の斜め左下方）への変位が制限される。突片１７２は、乗載面１７３の上方に突出するとともに、一対の案内部材１７１の相互の近接方向に突出する。案内部材１７１は、対を成して、支持台１７５上に固定される。
【００７０】
図１７は受け具１５３の側面図であり、図１８は受け具１５３が一対のチエン１４７に取付けられた状態を示す入口１１８側から見た正面図であり、図１９はその図１８に示される構成の水平断面図である。これらの図面を参照して、受け具１５３は基本的にほぼＣ字状断面を有し、このことは図１８から明らかである。入口１１８付近において、図１９に示される受け具１５３は、チエン１４７によって上昇変位される。この受け具１５３は、チエン１４７の走行方向下流側（図１７の上方）の下流側受け部１７７と、チエン１４７の上流側の上流側受け部１７８と、これらの各受け部１７７，１７８を連結する連結部１７９とを有する。下流側受け部１７７は、Ｖ字状に連結された受け片１８０，１８１とを有する。上流側受け部１７８は、水平線に対して角度θ１で緩やかに傾斜した受け片１８２と、水平な受け片１８３とを有する。角度θ１は、たとえば１０度であってもよい。受け片１８１，１８３を連結する連結片１７９は、図１７では鉛直に伸び、取付け用ブラケット１８４が、連結片１７９の受け部１７７，１７８と反対側（図１８の左方、すなわちチエン１４７寄り）に、固定される。チエン１４７のリンク１８５には、取付け座１８６が一体的に形成されており、この取付け座１８６には、支持部材１８７の端部が固定される。支持部材１８７は、加熱炉１１６の炉体１１７の幅方向（図１８の左右方向）に水平に伸びる。支持部材１８７は、大略的にＵ字状に構成され、取付け部１８８と、その両側部１８９とを有する。
【００７１】
再び図１４を参照して、チエン１４７の走行方向１９０と管３２、したがって金型装置３１の軸線３５とに垂直に交差する方向（図１４および図１７の左右方向）に、下流側受け部１７７の遊端部１９１よりも、上流側受け部１７８の遊端部１９２が、水平な距離Ｌ１だけ図１４および図１７の右方に突出している。下流側受け部１７７の遊端部１９１は、突片１７２のチエン１４７側の端部１９３とわずかな間隔Ｌ２をあけ、またこの突片１７２に当接して図１４の左下方への変位が制限されている金型装置３１ａのチエン１４７寄りの端部３１ｂとはわずかな間隔Ｌ３があけられる。したがって下流側受け部１７７が、チエン１４７によって上昇変位するとき、突片１７２および金型装置３１ａに接触したり衝突したりすることはない。
【００７２】
上流側受け部１７８の受け片１８２の遊端部１９２は、金型装置３１ａの案内部材１７１における乗載面１７３に支持されている位置１９４よりも、チエン１４７とは反対側（図１４の右方）に突出して伸び、その水平距離は、参照符Ｌ４で示される。乗載面１７３が水平面と成す角度θ２は、たとえば６度であり、したがってθ１＞θ２に選ばれる。
【００７３】
さらに下流側受け部１７７の遊端部１９１と上流側受け部１７８の遊端部との上下の距離Ｈ１は、受け具１５３で受けられる金型装置３１の最大外径Ｄ１を超える値に選ばれ（すなわちＨ１＞Ｄ１）、これによって上下の受け部１７７，１７８で受けられている金型装置３１を、この距離Ｈ１間で装入、取出しが可能になる。
【００７４】
図２０は取出し・冷却手段１３２の側方から見た断面図であり、図２１はその取出し・冷却手段１３２の平面図であり、図２２は図２０および図２１の右方から見た取出し・冷却手段の正面図である。これらの図面を参照して、一対のアーム１４２の一端部には、前述のように取出し受け具１４１がそれぞれ固定される。この取出し受け具１４１は、アーム１４２の長手方向に垂直に立上る受け片２０１と、その受け片２０１に対向し加熱炉１１６から遠去かるにつれて上方に傾斜した受け片２０２と、これらの受け片２０１，２０２を連結する連結片２０３とから成る。
【００７５】
一対の受け具１５３間に、一対の案内部材１７１と一対のアーム１４２、したがって一対の取出し受け具１４１が配置される。アーム１４２は、補強片２０４，２０５によって枠を構成して組立てられる。このアーム１４２の補強部材２０５寄りで、駆動軸２０６が固定される。この駆動軸２０６は、水平軸線を有する。駆動軸２０６は、アーム１４２の両側方で軸受２０７によって回転自在に支持され、軸継手２０８を介してロータリアクチュエータ２０９に連結される。これによってアーム１４２は、図２０の実線で示される水平な位置から、仮想線１４３で示される冷却時の傾斜した位置の範囲にわたって角度θ３だけ、往復角変位駆動される。θ３は、たとえば３０度であってもよい。
【００７６】
軸受２０７とロータリアクチュエータ２０９とは、移動台２１１上に固定される。この移動台２１１は、固定位置に設けられた架台２１２上に、加熱炉１１６に向けて伸びる一対の案内レール２１３によって案内されて図２０および図２１の水平方向および図２２の紙面に垂直方向に往復移動して横移動することができる。この移動台２１１は、架台２１２に一端が固定されたシリンダ２１３によって、横方向に駆動される。シリンダ２１３の駆動部であるロッド２１４は、取付け片２１５によって、移動体２１１の下部に連結される。こうして取出し・冷却手段１３２において、取出し受け具１４１とアーム１４２と、テーブル２１１とシリンダ２１３とは、取出し手段を構成する。
【００７７】
冷却手段を構成する水槽１４４には、溢流壁２１６が、その貯留槽１４４の底２１７に立設される。底２１７の供給口２１８からは、冷却水が連続して供給され、その水１４５は溢流壁２１６の上端部を溢流し、部屋２１９から、底２１７に形成された排出口２２０から排出される。この貯留槽１４４は、加熱炉１１６と架台２１２との間に配置される。
【００７８】
図１および図２０〜図２２を参照して、金型装置３１が加熱室１２５から取出され、圧縮空気が加えられ冷却される動作を説明する。受け具１５２上の金型装置３１は、受け具１５２の下降に伴って、加熱室１２５内に挿入された取出し受け具１４１上に移る。取出し受け具１４１上の金型装置３１は、アーム１４２によって架台２１２上に取出され、一方端４０から圧縮空気が供給され、管３０が拡径と伸長された管３０ａにされる。次にアーム１４２が冷却水槽１４４の方向に傾斜し、取出し受け具１４１上の金型装置３１が冷却水槽１４４内に入れられて冷却される。
【００７９】
図２３は、本発明の実施の他の形態の合成樹脂製管の製造装置２３０の簡略化した側面図である。製造装置２３０は、加熱炉２３１と冷却水槽２３２と搬送手段２３３とから構成され、搬送手段２３３によって加熱炉２３１と冷却水槽２３２とにわたって受け具２３４が矢符方向に搬送される。金型装置３１は装入手段２３５によって、２３４ａの位置で受け具２３４に載せられ、加熱炉２３１で加熱され、加熱炉２３１を出た位置２３４ｂで加圧され、冷却水槽２３２に入れられ、２３４ｃの位置で受け具２３４から冷却水槽２３２中に排出される。搬送手段２３３、装入手段２３５の構成は先の実施の形態の搬送手段１３４、装入手段１３１と同一の構成であり、受け具２３４の形状も先の実施の形態の受け具１５３の形状と同一であるので説明を省略する。
【００８０】
【発明の効果】
以上のように本発明によれば、拡径され多孔性とされた管は、切落される部分が少なくでき歩留りが向上できる。また管を金型装置に組込む操作と拡径された管を金型装置から取出す操作とを行うだけで、径の揃った希望する長さの多孔性管を量産できる。
【図面の簡単な説明】
【図１】本発明の実施の一形態の金型装置３１の簡略化した断面図である。
【図２】移動体３７がストッパ４２に当接してその変位が制限されている状態が示されている。
【図３】保持手段３６付近の図１における一部の拡大断面図である。
【図４】金型３４の一端部４０付近に取付けられた取付け部材３９付近の断面図である。
【図５】保持手段３６の構成を示す断面図である。
【図６】移動体３７の具体的な構成を示す断面図である。
【図７】ストッパ４２および取付け部材４３の具体的な断面図である。
【図８】前述の図２において成形されて冷却された後の製品の管３０ａを金型３４から取出して製品とするときの作業を説明するための図である。
【図９】本発明の実施の一形態の熱可塑性合成樹脂製管の製造装置の一部の構成要素をなす加熱炉１１６の簡略化した斜視図である。
【図１０】加熱炉１１６と、その入口１１８に設けられてその入口１１８に金型装置３１を個別的に装入する装入手段１３１と、出口１１９に連なって設けられ、出口１１９から加熱された金型装置３１を個別的に取出すとともに、その取出された金型装置３１を冷却する取出し・冷却手段１３２とを示す断面図である。
【図１１】加熱炉１１６と装入手段１３１と取出し・冷却手段１３２とを示す平面図である。
【図１２】加熱炉１１６の側面図であって、加熱手段１２３と搬送手段１３４の駆動手段１３５を示す図である。
【図１３】加熱室１２５内における搬送手段１３４の構成を示す断面図である。
【図１４】装入手段１３１の側方から見た簡略化した断面図である。
【図１５】装入手段１３１の平面図である。
【図１６】装入手段１３１の図１５における左方から見た正面図である。
【図１７】受け具１５２の側面図である。
【図１８】受け具１５２が一対のチエン１４７に取付けられた状態を示す入口１１８側から見た正面図である。
【図１９】図１８に示される構成の水平断面図である。
【図２０】取出し・冷却手段１３２の側方から見た断面図である。
【図２１】取出し・冷却手段１３２の平面図である。
【図２２】図２０および図２１の右方から見た取出し・冷却手段の正面図である。
【図２３】本発明の実施のさらに他の形態の簡略化した側面図である。
【図２４】従来技術の合成樹脂製管の製造装置の断面図である。
【符号の説明】
３０管
３１金型装置
３２一端部
３３他端部
３４金型
３６保持手段
３７移動体
３９，４３取付け部材
４２ストッパ
４４固定側ホルダ
４５保持部材
４６，７６収納孔
４７，７７挿通孔
８３調整部材
１１６加熱炉
１１７炉体
１１８入口
１１９出口
１２３加熱手段
１２４開口
１２５加熱室
１２７ファン
１３１装入手段
１３２取出し・冷却手段
１３４搬送手段
１３５駆動手段
１４１取出し受け具
１４２アーム
１４４水槽
１４７チエン
１４８〜１５２スプロケットホイル
１５３受け具
１６９駆動手段
１７０モータ
１７１案内部材
１７３乗載面
１７５支持台
１８４ブラケット
１８５リンク
１８６取付け座
１８７支持部材
１８８取付け部[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method and an apparatus for producing a synthetic resin pipe, and in particular, for producing a porous heat-shrinkable pipe by expanding and expanding the diameter using a polytetrafluoroethylene polymer (abbreviated as PTFE) pipe as a raw material. Can be suitably implementedDressRelated to the position.
[0002]
[Prior art]
A prior art of an apparatus for producing a synthetic resin pipe in a batch type is disclosed in JP-A-62-279920. FIG. 24A is a cross-sectional view showing the configuration. A synthetic resin pipe, for example, PTFE pipe 2 is inserted into the mold 4 with the sheath pipe 8 fitted at both ends, and both ends of the mold 4 are fixed to the sheath pipe 8 by the support fitting 5. In this state, a mounting jig 6 having a compressed gas inlet 9 at one end of the tube 2 and a mounting jig 7 having a plug 10 at the other end are mounted, and the whole is heated above the softening point of the tube 2 and below the melting point. The compressed gas is supplied from the compressed gas inlet 9. The pipe 2 between the support fittings 5 is expanded by the compressed gas so as to come into contact with the mold 3 and becomes porous, so that a pipe having the shape shown in FIG. 24B is obtained. The product 1 is obtained by cutting the both ends 3 in which the sheath tube 8 is fitted.
[0003]
In the prior art device, since the sheath tube 8 is used, both end portions 3 of the tube are wasted, and the products are manufactured one by one, which is not suitable for mass production.
[0004]
[Problems to be solved by the invention]
  The object of the present invention is to eliminate the waste of synthetic resin pipes as raw materials, improve the yield, and manufacture synthetic resin pipes that can be mass-produced.DressingIs to provide a position.
[0015]
[Means for Solving the Problems]
  BookThe invention is cylindrical with a linear axisofMold,
  Made of synthetic resin, provided in the mold, blocked from movement in the axial direction of the moldofHolding means for detachably holding one end of the tube, and forming a passage communicating with the one end of the tube;
  A movable body provided in the mold so as to be movable in the axial direction of the mold, and closing the other end of the pipe;
  Compressed fluid supply means for supplying compressed fluid to the passage of the holding means.See
  The holding means is
  A fixed side holder,
  A holding member that can be attached to and detached from the fixed side holder,
  The fixed side holder is
  Having a support that is in close proximity to or in contact with the inner peripheral surface of the mold;
  A fixed-side holding hole having an axis on the same straight line as the axis of the mold and having an inner diameter that increases as the distance from the moving body is formed,
  The holding member
  It has a fixed-side fitting protrusion that fits into the fixed-side holding hole and decreases in outer diameter as it approaches the moving body,
  In the fitting protrusion, a passage for supplying a compressed fluid opened to the moving body side is formed,
  At the end of the fixed side holder opposite to the moving body, the fixed side holder and the holding member are screwed together,
  The one end of the tube is clamped between the fixed-side holding hole and the fixed-side fitting protrusion.This is a synthetic resin pipe manufacturing apparatus.
[0016]
  According to the present invention, the cylindrical mold, the holding means, and the moving body constitute a mold apparatus, and supply one end of the holding means to the holding means by supplying the compressed fluid from the compressed fluid supply source to the passage of the holding means. Is expanded, the outer peripheral surface of the tube is in contact with the inner peripheral surface of the mold and expanded to expand the diameter, and the tube extends in the longitudinal direction, and the longitudinal The expansion in the direction is absorbed by the movement of the moving body.
  Further, in the holding means for holding the one end of the synthetic resin pipe in the mold so as not to move in the axial direction of the mold and detachably, the fixed-side fitting protrusion of the holding member is placed in the one end of the pipe. Is inserted, the outer peripheral surface of one end of the tube is pressed against the inner peripheral surface of the fixed-side holding hole of the fixed-side holder, and the fixed-side holder and the holding member are screw-coupled to each other. One end can be firmly attached to the holding means. Also, by removing this screw connection, one end of the tube can be easily removed from the holding means after the tube expansion operation.
  A configuration may be adopted in which a female screw is engraved on the fixed side holder and a screw is engraved on the holding member and engaged, or a screw is engraved on the fixed side holder and a female screw is engraved on the holding member. It is good also as a structure to install and screw. The female screw and the male screw have axes on the common axis of the fixed side holder and the holding member, respectively.
[0020]
In the present invention, the holding means is
A compressed fluid supply pipe fixed to the end of the holding member opposite to the moving body and insertable into the mold;
In the mold, the compressed fluid supply pipe is supported so that the axis of the compressed fluid supply pipe exists on the same straight line as the axis of the holding member, and the insertion length into the mold can be adjusted, and the mold And a mounting member fixed to the head.
[0021]
According to the present invention, one end of a rigid compressed fluid supply pipe is fixed to the holding member, and a halfway position in the linear longitudinal direction of the compressed fluid supply pipe is detachably fixed to the end of the mold. For example, with such a structure, it is possible to adjust the charging length of the holding member into the mold. Therefore, the position of the holding member can be adjusted according to the length of the tube obtained by expanding the tube.
[0022]
  In the present invention, the mobile object is
  A moving holder,
  Including a closing member detachable from the moving side holder,
  The moving side holder is
  Having a support that is in close proximity to or in contact with the inner peripheral surface of the mold;
  It has an axis that is collinear with the axis of the mold, and its inner diameter increases as it moves away from the holding means.NaMoving side holding holes are formed,
  The blocking member is
  It has a moving side fitting projection that fits into the moving side holding hole and has an outer diameter that decreases as it approaches the holding means,
  At the end of the moving side holder opposite to the holding means, the moving side holder and the closing member are screwed together,
  The other end portion of the tube is sandwiched between the moving side holding hole and the moving side fitting projection.
[0023]
According to the present invention, the moving-side fitting protrusion of the closing member is inserted into the other end of the tube that is the raw material, and the outer peripheral surface of the other end of the tube is held on the moving-side holder formed on the moving-side holder. It can be pressed against the inner peripheral surface of the hole and clamped, and can be firmly fixed by screw connection between the moving side holder and the closing member.
[0024]
A support portion is formed on the fixed side holder, and a similar support portion is also formed on the moving side holder, thereby expanding the diameter of the tube in a state where the axis of the tube substantially coincides with the axis of the mold. Can do. Therefore, the thickness and pores of the product tube can be made substantially uniform in the circumferential direction and the axial direction, and quality can be improved.
[0025]
  Although the support portion may be formed in, for example, a columnar shape or a cylindrical shape that is continuous in the circumferential direction, in another embodiment of the present invention, the inner peripheral surface of the mold is spaced at least three locations in the circumferential direction. It may be realized by a sliding projection or the like that is in close proximity to or in contact with each other, and this sliding projection may be formed at intervals of 120 ° around the axis.
  The present invention also provides a cylindrical mold having a linear axis,
  A holding means provided in the mold so as to be prevented from moving in the axial direction of the mold, detachably holding one end of the synthetic resin pipe, and having a passage communicating with the one end of the pipe; ,
  A movable body provided in the mold so as to be movable in the axial direction of the mold, and closing the other end of the pipe;
  Compressed fluid supply means for supplying compressed fluid to the passage of the holding means,
  The moving body
  A moving holder,
  Including a closing member detachable from the moving side holder,
  The moving side holder is
  Having a support that is in close proximity to or in contact with the inner peripheral surface of the mold;
  A movement side holding hole having an axis that is collinear with the axis of the mold and having an inner diameter that increases as the distance from the holding means is formed,
  The blocking member is
  It has a moving side fitting projection that fits into the moving side holding hole and has an outer diameter that decreases as it approaches the holding means,
  At the end of the moving side holder opposite to the holding means, the moving side holder and the closing member are screwed together,
  The synthetic resin pipe manufacturing apparatus is characterized in that the other end portion of the pipe is sandwiched between the moving side holding hole and the moving side fitting protrusion.
  According to the present invention, the cylindrical mold, the holding means, and the moving body constitute a mold apparatus, and supply one end of the holding means to the holding means by supplying the compressed fluid from the compressed fluid supply source to the passage of the holding means. Is expanded, the outer peripheral surface of the tube is in contact with the inner peripheral surface of the mold and expanded to expand the diameter, and the tube extends in the longitudinal direction, and the longitudinal The expansion in the direction is absorbed by the movement of the moving body.
  Further, the moving side fitting protrusion of the closing member is inserted into the other end of the tube as the raw material, and the outer peripheral surface of the other end of the tube is the inner periphery of the moving side holding hole formed in the moving side holder. It can be pressed against the surface and clamped, and can be firmly fixed by screw connection between the moving side holder and the closing member.
[0026]
  In the present invention, the mold includes the above-mentionedMoving bodyA stopper that limits the movement length of the other end of the tube along the axis of the mold is provided so as to be adjustable in displacement in the direction of the axis of the mold.
[0027]
  According to the present invention, the other end of the tube as the raw material isMobile object to be blockedThe movement length in the axial direction of the product is limited by the stopper, so that the length in the axial direction of the product can be set to the desired value with the same mold, eliminating variations among products, quality Will be improved.
[0028]
  The present invention also provides (a) a mold apparatus,
  Tubular with a straight axisofMold,
  Made of synthetic resin, provided in the mold, blocked from movement in the axial direction of the moldofHolding means for detachably holding one end of the tube, and forming a passage communicating with the one end of the tube;
  A mold apparatus having a movable body provided in the mold so as to be movable in the axial direction of the mold and closing the other end of the pipe;
  (B) a heating furnace,
  A furnace body formed with an inlet for charging the mold apparatus and an outlet for discharging the mold apparatus;
  Conveying means for conveying the mold apparatus from the inlet to the outlet in the furnace,
  A heating furnace having heating means for heating the mold apparatus in the furnace body during conveyance by the conveyance means;
  (C) means for individually charging the mold apparatus at the inlet of the heating furnace;
  (D) extraction means for individually removing the mold apparatus from the outlet of the heating furnace;
  (E) cooling means for cooling the mold apparatus taken out from the outlet of the heating furnace by the take-out means;
  (F) provided in the vicinity of the take-out means and the cooling means, in the passage of the holding means of the mold apparatus individually taken out from the outlet of the heating furnace by the take-out meansSmallAt least until the mold device is cooled by the cooling means,Compressed fluidA synthetic resin pipe manufacturing apparatus including a compressed fluid supply means for supplying.
[0029]
  According to the present invention, the mold apparatus including the cylindrical mold, the holding means, and the moving body is charged into the furnace body of the heating furnace by the charging means, and the mold apparatus is transported from the inlet to the outlet in the furnace body. The thermoplastic synthetic resin pipe, which is the raw material in the mold apparatus, is heated to a temperature not lower than the softening point and lower than the melting point, and then the mold apparatus is heated in the furnace body. Taken out from the outlet by the take-out means, and into the holding means passage of the mold apparatus, PressureThe contracted fluid is supplied from the compressed fluid supply means, whereby the tube is expanded and expanded to be molded, and in this state, the cooling means is cooled to a temperature below the softening point, for example, to room temperature. This waySelfDynamically and alsoIsThe product can be mass-produced almost automatically.
[0030]
  In the present invention, the conveying means of the heating furnace is
  An endless annular rope stretched between the inlet and outlet of the furnace,
  Drive means for driving the strip in one direction;
  It has a substantially C-shaped cross section that is provided at intervals in the longitudinal direction of the rope, and that receives and supports the mold in a substantially horizontal posture from the entrance to the exit of the heating furnace.DoAnd a plurality of receivers.
[0031]
According to the present invention, a strip such as a chain is driven by a driving means and is provided in an endless annular manner from the inlet to the outlet of the heating furnace, and the strip has a plurality of substantially C-shaped cross sections. A receiving tool is attached to receive and support the mold in a substantially horizontal posture, that is, with the mold axis being substantially horizontal. According to the receiving device having this configuration, it is easy to support loading from the inlet of the tube and to remove and discharge from the outlet, and automation is easy.
[0034]
In the present invention, the rope has a stretch portion extending vertically at the entrance and exit of the heating furnace,
Driven in the direction of rising near the entrance and descending near the exit,
The charging means is
A guide member that has a mounting surface inclined downward as it approaches the entrance of the heating furnace, and on which the mold apparatus is mounted in a substantially horizontal posture and adjacent thereto,
The guide member has a protruding piece that is fixed at the lower end of the mounting surface and restricts the displacement of the mold apparatus,
The receiver is
A downstream side receiving portion on the downstream side in the running direction of the rope;
An upstream receiving portion on the upstream side,
The free end portion of the upstream receiving portion protrudes from the free end portion of the downstream receiving portion in a direction intersecting the running direction of the rope and the axis of the tube,
In the vicinity of the entrance of the heating furnace, at the free end portion of the upstream receiving portion, the mold device whose displacement is restricted by the protruding piece on the mounting surface is received from below when the rope is raised. To do.
[0035]
According to the present invention, on the mounting surface of the guide member in the charging means, a plurality of mold apparatuses are mounted in a substantially horizontal posture and adjacent to each other, and this mounting surface is a furnace body of a heating furnace. Since it is inclined downward as it approaches the entrance of the mold, the mold device slides on the mounting surface to bring it to the entrance, and at the lower end of the mounting surface, the displacement of the lowest mold device is reduced. In order to limit, a receiving piece having a substantially C-shaped cross section as described above is provided on the upstream receiving portion of the receiving piece provided on the rope rising near the entrance. A single die device whose displacement is limited by a protrusion on the mounting surface is received and taken up.
[0036]
In the stretched portion that rises in the vicinity of the entrance of the rope, the free end portion of the upstream side receiving portion protrudes from the free end portion of the downstream side receiving portion, so that it rides on the mounting surface of the guide member and protrudes. One mold apparatus whose displacement is limited by the piece does not collide or come into contact with the free end part of the downstream side receiving part, and the one mold apparatus at the free end part of the upstream side receiving part. Is sure to be received and loaded from below.
[0037]
In the present invention, the take-out means is
An extraction receptacle that is opened upward to receive the mold apparatus supported by the downstream receiving portion in the vicinity of the outlet of the heating furnace,
An arm provided with a take-out receptacle at one end;
The arm includes lateral drive means that reciprocally moves the arm in a direction intersecting the traveling direction of the rope and the axis of the tube.
[0038]
According to the present invention, near the outlet of the furnace body of the heating furnace, the rope is lowered, and in this state, the mold apparatus is supported by the downstream receiving portion of the receiving tool, and in the lateral direction near this outlet. The free end portion, which is one end portion of the arm that can be reciprocally displaced by the driving means, is provided with a takeout receptacle that is opened upward, and the mold apparatus supported by the downstream side receptacle portion is received by the takeout receptacle. In the received state, it is taken out by the action of the lateral driving means outward from the range of the descending trajectory of the receptacle. Thus, the heated mold apparatus can be automatically taken out from the outlet of the heating furnace.
[0039]
In the present invention, the cooling means is
A storage tank that is disposed below the arm and stores the coolant;
An angular displacement driving means for immersing the mold device supported by the takeout receiving tool by reciprocating angular displacement driving the other end of the arm around the horizontal axis and taking it out from the cooling liquid is included. It is characterized by that.
[0040]
  According to the present invention, the heated mold apparatus received by the take-out receptacle is in a state where the compressed fluid is supplied as described above, and the arm is angularly displaced by the angular displacement driving means, and the inside of the storage tank. It is immersed and cooled in a coolant such as water. Therefore, the mold apparatus can be efficiently cooled. The outer peripheral surface of the expanded thermoplastic synthetic resin pipe is in contact with the inner peripheral surface of the mold of the mold apparatus, and the expanded pipe is compressed fluid during cooling. By keeping the supplied, accurate molding can be performed.
  In the present invention, the heating means
  Form hot air passages over the openings formed above and below the heating chamber of the furnace body,
  A heating source and a fan for blowing hot air are provided in the middle of the hot air passage.
  According to the present invention, hot air obtained by a heating source such as a gas burner using gas fuel or liquid fuel is blown by a fan and circulated in the heating chamber through openings formed above and below the heating chamber of the furnace body. Thus, the mold apparatus can be heated uniformly in the heating chamber. The heated hot air from the hot air passage is supplied to the heating chamber from, for example, the lower opening of the heating chamber, and the gas in the heating chamber is circulated from the upper opening of the heating chamber to the heating source through the hot air passage. May be.
  In the present invention, the synthetic resin tube is porous.
  The synthetic resin pipe of the present invention may be either nonporous or porous, but is preferably a porous pipe.
  In the present invention, the tube is made of a polytetrafluoroethylene polymer,
  The resulting tube is characterized by having heat shrinkability in the radial direction.
  According to the present invention, PTFE is used as the material of the tube, and this material can be copolymerized not only with tetrafluoroethylene homopolymer but also 2% by weight or less (particularly preferably 0.01 to 1% by weight). So-called modified polytetrafluoroethylene obtained by copolymerizing various monomers. Examples of the copolymerized monomer include perfluoroalkyl vinyl ether, chlorotrifluoroethylene, hexafluoropropylene, and the like. In this invention, after sintering the pipe | tube obtained by paste extrusion molding this PTFE, it is preferable to use it as a raw material synthetic resin pipe | tube.
  The heating temperature may be, for example, 90 ° C. to 250 ° C., and the pressure of the compressed fluid is, for example, 2 to 10 kg / cm. ² It may be. The other end of the tube may be closed by a moving body described later, but may be closed without providing such a moving body.
[0041]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a simplified cross-sectional view of a mold apparatus 31 according to an embodiment of the present invention. As shown in FIG. 1, one end portion 32 in the longitudinal direction (left and right direction in FIG. 1) of the synthetic resin pipe 30 as a raw material is fixed, and the other end portion 33 extends in the direction of the axis 35 in the mold 34. It is provided to be displaceable in a direction away from the one end portion 32 (right side in FIG. 1). When the tube 30 is heated at a temperature equal to or higher than the softening point and lower than the melting point, and the compressed gas is supplied from the one end 32, the tube 30 expands in the radial direction as shown in FIG. It expands and expands to form a porous material. By cooling in the expanded state of FIG. 2, the pipe 30a which is a product whose diameter has been expanded can be obtained.
[0042]
The mold 34 has a cylindrical shape, for example, a right cylindrical shape in this embodiment. The inner diameter of the mold 34 is uniform along the axis 35, and the axis 35 is linear. A holding means 36 is provided in the mold 34 so as to be prevented from moving in the direction of the axis 35, and the one end 32 of the tube 30 is detachably held by the holding means 36. In the mold 34, a moving body 37 that is detachably attached by closing the other end 33 of the tube 30 is provided to be movable to the right in FIG. 1 of the axis 35 of the mold 34. The holding means 36 has a compressed gas supply pipe 38 formed in a rigid substantially cylindrical shape. The compressed gas supply pipe can be adjusted in the vicinity of one end 40 of the mold 34 by the mounting member 39 so that the length of the compressed gas supply pipe 38 inserted into the mold 34 can be adjusted. Fix to 40. A stopper 42 is provided at the other end 41 of the mold 34 so that the displacement can be adjusted by another mounting member 43. The stopper 42 limits the moving length of the other end 33 of the tube 30 along the axis 35 of the mold 34, and thus the moving body 37.
[0043]
FIG. 2 shows a state in which the moving body 37 is in contact with the stopper 42 and its displacement is limited. The mold apparatus 31 is configured to be substantially line symmetrical with respect to the axis 35.
[0044]
3 is an enlarged cross-sectional view of a part of FIG. An attachment member 39 is detachably fixed to one end portion 40 of the mold 34, and a compressed gas supply pipe 38 is attached to the attachment member 39 so that displacement can be adjusted. The holding means 36 includes a fixed side holder 44, a holding member 45 that can be attached to and detached from the fixed side holder 44, and further includes the compressed gas supply pipe 38 described above.
[0045]
FIG. 4 is a cross-sectional view of the vicinity of the attachment member 39 attached in the vicinity of one end 40 of the mold 34. The attachment member 39 is formed with a storage hole 46 for storing the one end portion 40 and an insertion hole 47 having a smaller diameter than the storage hole 46. The compressed gas supply pipe 38 is inserted into the insertion hole 47. One or a plurality of bolts 48 (for example, 2 in this embodiment) are screwed to the mounting member 39 in accordance with the position of the storage hole 46. The front end portion of the bolt 48 is in contact with the outer peripheral surface of the one end portion 40 of the mold 34 in the housing hole 46, and the attachment member 39 is detachably attached to the one end portion 40.
[0046]
A plurality (two in this embodiment) of bolts 49 are screwed to the mounting member 39. The end of the bolt 49 facing the insertion hole 47 is in contact with the outer peripheral surface of the compressed gas supply pipe 38 and is detachably fixed so as to prevent displacement of the compressed gas supply pipe 38 in the axial direction. The inner diameter of the storage hole 46 is slightly smaller than the outer diameter of the one end portion 40 of the mold 34, and the inner diameter of the insertion hole 47 is slightly larger than the outer diameter of the compressed gas supply pipe 38. Gas such as air can be diffused to the atmosphere through the gaps, and molding can be performed smoothly. The mounting member 39 holds the compressed gas supply pipe 38 so that the axis of the compressed gas supply pipe 38 coincides with the axis 35 of the mold 34.
[0047]
FIG. 5 is a cross-sectional view showing the configuration of the holding means 36. The fixed side holder 44 has support portions 51 at both ends in the axial direction thereof. The holding member 45 also has a support portion 52. These support portions 51 and 52 have a diameter substantially equal to or slightly smaller than the inner diameter of the mold 34, so that the support portions 51 and 52 are very close to or in contact with the inner peripheral surface of the mold 34. Thus, the axis 57 of the holding means 36 is held so as to coincide with the axis 35 of the mold 34.
[0048]
The fixed side holder 44 is formed with a fixed side insertion hole 53 through which the one end 32 of the tube 30 is inserted near the moving body 37 (to the right in FIG. 5), and further, a fixed side holding hole 54 connected to the insertion hole 53. Is formed. The fixed-side holding hole 54 is formed in the shape of a hollow truncated cone having a larger inner diameter as it moves away from the moving body 37 (that is, as it moves to the left in FIG. 5). The insertion hole 53 and the fixed side holding hole 54 are coaxial with the axis 57. The fixed side holder 44 is formed with a female screw 55a that is continuous with the fixed side holding hole 54 and has a larger inner diameter.
[0049]
The holding member 45 has a fixed-side fitting projection 56 that fits into the fixed-side holding hole 54, and further has a male screw 55 b that is formed continuously to the base end portion of the fitting projection 56. The male screw 55b is detachably engaged with the female screw 55a of the fixed side holder 44. Thus, the fixed side holder 44 and the holding member 45 are screwed together.
[0050]
The fitting protrusion 56 is formed in a truncated cone shape so that the outer diameter becomes smaller as it approaches the moving body 37 (that is, as it goes to the right in FIG. 5). The angle formed with the axis 57 of the inner peripheral surface of the holding hole 54 and the outer peripheral surface of the fitting projection 56 is, for example, a taper of 3 degrees. A fitting protrusion 56 is inserted into one end 32 of the tube 30 inserted into the holding hole 54, and one end of the tube 30 is between the outer peripheral surface of the fitting protrusion 56 and the inner peripheral surface of the holding hole 54. The end portion 32 of the tube 30 can be firmly fixed to the fixed side holder 44 by sandwiching the portion 32 and tightening the holding member 45.
[0051]
A female screw 58 is formed at the end of the holding member 45 opposite to the fitting protrusion 56. A male screw 59 formed at the end of the compressed gas supply pipe 38 is screwed into the female screw 58, and the compressed gas supply pipe 38 is coaxially fixed to the holding member 45.
[0052]
A coaxial passage 60 is formed in the holding member 45. As a result, the compressed gas from the compressed gas supply pipe 38 is supplied from the fitting protrusion 56 into the one end 32 of the pipe 30 through the passage 60.
[0053]
A coaxial hollow frustoconical guide surface 61 is formed at the end of the insertion hole 53 of the fixed side holder 44 near the moving body 37. As a result, the one end 32 of the tube 30 can be smoothly expanded in the radial direction.
[0054]
FIG. 6 is a cross-sectional view showing a specific configuration of the moving body 37. The moving body 37 includes a moving side holder 63 and a closing member 64. The moving side holder 63 has support portions 65 at both ends in the axial direction thereof. The closing member 64 also has a support portion 66. The diameters of these support portions 65 and 66 are slightly smaller than the inner diameter of the mold 34, so that the support portions 65 and 66 are close to the inner peripheral surface of the mold 34, whereby the movable body 37 is moved to the mold 37. It is movable along the axis 35 of 34.
[0055]
The moving side holder 63 is formed with a moving side insertion hole 67 through which the other end 33 of the tube 30 is inserted near the holding means 36 (left side in FIG. 6). 68 is formed. The moving side holding hole 68 is formed in the shape of a hollow truncated cone having a larger inner diameter as it moves away from the holding means 67 (as it goes to the right in FIG. 6). The insertion hole 67 and the holding hole 68 are coaxial with the axis 69 of the moving body 37. The moving holder 63 is formed with a female screw 70 that is continuous with the holding hole 68 and has a larger inner diameter.
[0056]
The closing member 64 has a closing-side fitting projection 71 that fits into the holding hole 68, and has a male screw 72 that is formed continuously to the base end of the fitting projection 71. The male screw 72 is screwed with the female screw 70 to couple the moving side holder 63 and the closing member.
[0057]
The fitting protrusion 71 is formed in a truncated cone shape so that the outer diameter becomes smaller as it approaches the holding means 36 (as it goes to the right in FIG. 6). The angle formed with the axis 69 of the inner peripheral surface of the holding hole 68 and the outer peripheral surface of the fitting projection 71 is, for example, a taper of 3 degrees. A fitting projection 71 is inserted into the other end 33 of the tube 30 inserted into the holding hole 68, and the other of the tube 30 is inserted between the outer peripheral surface of the fitting projection 71 and the inner peripheral surface of the holding hole 68. The end 32 is clamped, and the other end 33 of the tube 30 is firmly fixed to the moving body 37 by tightening the closing member 64.
[0058]
A coaxial hollow frustum-shaped guide surface 73 is formed at the end of the insertion hole 67 of the moving side holder 63 near the holding means 36. As a result, the other end 33 of the tube 30 is smoothly expanded in the radial direction.
[0059]
FIG. 7 is a cross-sectional view of the mold 34 near the other end 41. An attachment member 43 is attached to the other end 41 of the mold 34, and a stopper 42 is further fixed to the attachment member 43. The attachment member 43 is formed with a storage hole 76 for storing the other end 41 and an insertion hole 77 having a smaller diameter than the storage hole 76. A cylindrical adjustment member 83 that adjusts the position of the stopper 42 is inserted through the insertion hole 77. One or a plurality of bolts 78 (for example, 2 in this embodiment) are screwed to the attachment member 43 in accordance with the position of the accommodation hole 76. The front end portion of the bolt 78 is in contact with the outer peripheral surface of the other end portion 41 of the mold 34 in the accommodation hole 76, and the attachment member 43 is removably attached to the other end portion 41.
[0060]
A plurality (two in this embodiment) of bolts 79 are further screwed to the mounting member 43. The end of the bolt 79 facing the insertion hole 77 is in contact with the outer peripheral surface of the adjustment member 83 and is detachably fixed so as to prevent displacement of the adjustment member 83 in the axial direction. The inner diameter of the storage hole 76 is slightly smaller than the outer diameter of the other end portion 41 of the mold 34, and the inner diameter of the insertion hole 77 is slightly larger than the outer diameter of the adjustment member 83, thereby Gases such as air can be diffused to the atmosphere through the gaps, and molding can be performed smoothly.
[0061]
The attachment member 43 holds the adjustment member 83 so that the axis of the adjustment member 83 coincides with the axis 35 of the mold 34. The stopper 42 is integrally formed at the tip of the adjustment member 83 by welding or the like.
[0062]
FIG. 8 is a process diagram for explaining an operation when the tube 30a formed and cooled in FIG. 2 is taken out and finished into a product 30b. The attachment member 39 is removed from the mold 34, and the tube 30 a is extracted from one end 40 of the mold 34. This state is shown in FIG. Next, the other end 33 of the tube 30a is cut, and in order to maintain the shape of the tube 30a from the other end side, a paper 85 rolled into a cylindrical shape is inserted to the vicinity of the one end 32 of the tube 30a. This state is shown in FIG. Next, one end side of the tube 30a is cut. The product 30b is stored as shown in FIG. 8 (3) while the mold is inserted with cylindrical paper.
[0063]
FIG. 9 is a simplified perspective view of a heating furnace 116 that constitutes a part of a synthetic resin pipe manufacturing apparatus according to an embodiment of the present invention. In the furnace body 117 of the heating furnace 116, an inlet 118 into which the mold apparatus 31 is inserted and an outlet 119 through which the mold apparatus 31 is discharged are formed on the opposing walls 120 and 121, respectively. A heating means 123 is attached to the partition wall 122 of the furnace body 117. The heating means 123 sucks a gas such as air in the heating chamber 125 from an opening 124 formed in the upper part of the partition wall 122, heats it with a heating source 126, and blows it with a fan 127. It is ejected into the heating chamber 125 from the formed opening 130. In this way, the gas in the heating chamber 125 is circulated, and in the heating chamber 125, the mold apparatus 31, and thus the tube 30 as a raw material, is heated.
[0064]
FIG. 10 shows a heating furnace 116 and an inlet 118 provided therein, a charging means 131 for individually charging the mold device 31 into the inlet 118, and an outlet 119. The heating means 116 is heated from the outlet 119. It is sectional drawing which shows the taking-out and cooling means 132 which cools the taken-out mold apparatus 31 while taking out the mold apparatus 31 separately. 11 is a plan view showing the heating furnace 116, the charging means 131, and the take-out / cooling means 132. FIG. 12 is a side view of the heating furnace 116. FIG. 12 shows the heating means 123 and the conveying means. 134 driving means 135 are shown. The opposing walls 120 and 121 of the furnace body 117 of the heating furnace 116 are provided with doors 136 and 137 that can be opened and closed around the vertical axis above the inlet 118 and the outlet 119. 138 and 139, respectively. The mold apparatuses 31 charged from the charging means 131 are received and loaded one by one by the conveying means 134 and heated while being conveyed through the heating chamber 125 by the conveying means 134. The heated mold apparatus 31 is received by the take-out receiving tool 141 as shown by reference numeral 140 in FIG. 10 of the take-out / cooling means 132 and taken out from the outlet 119, and its arm 142 is shown in phantom lines in FIG. As shown by 143, it is tilted and immersed in water 145, which is a coolant in the water tank 144, and cooled.
[0065]
FIG. 13 is a cross-sectional view showing the configuration of the conveying means 134 in the heating chamber 125. Link chain 147 which is a pair of ropes which are spaced apart from each other in the width direction of the furnace body 117 of the heating furnace 116 (perpendicular to the paper surface of FIG. 13 and the vertical direction of FIG. 11) is provided in an endless ring. The sprocket wheels 148, 149; 150, 151 and the central sprocket wheel 152 are wound around. The chain 147 is stretched so as to rise between the sprocket wheels 148 and 150 near the inlet 118 and to fall between the sprocket wheels 149 and 151 near the outlet 119. A receiving member 153 is attached to the chain 147 at equal intervals in the longitudinal direction of the chain 147 with an interval in the longitudinal direction thereof. The receiving device 153 receives the mold device 31 inserted from the charging means 131 and allows the heated mold device to be automatically taken out by the take-out receiving device 141.
[0066]
In FIG. 11, the chain 147 and the receiver 153 are not shown for convenience of drawing, and the axes of the rotary shafts 154 to 158 each having a horizontal axis to which the sprocket wheel 148 is fixed are indicated by the suffix a. Attached and shown respectively. Each of these rotating shafts 154 to 158 is inserted through the side wall 160 of the heating means 123 through the side wall 159 and the partition wall 122 of the furnace body 117, and is rotatably supported.
[0067]
The rotating shaft 156 of the sprocket wheel 150 protrudes outward from the side wall 160 and is fixed to the worm wheel 162. The worm wheel 162 meshes with the worm 163, and the worm 163 is rotationally driven by the motor 164. In this way, the chain 147 of the conveying means 134 is driven to travel in one direction in the longitudinal direction.
[0068]
In the heating means 123, a hot air passage 166 is formed by the partition wall 122 and the side wall 160. In the hot air passage 166, an impeller 167 constituting the fan 127 is disposed below the heating source 126. The impeller 167 is fixed to a rotating shaft 168 that protrudes outside the side wall 160 and is rotatably provided. The rotating shaft 168 is rotationally driven by the power of the motor 170 by a winding driving means 169 such as a chain. The air thus sucked from the upper opening 124 is introduced into the hot air passage 166, heated by the heating source 126, pumped by the fan 127, introduced into the heating chamber 125 from the lower opening 129, and circulated. In the heating chamber 125, the hot mold blows the mold device 31 transported by the transport means 134, and thus the thermoplastic synthetic resin pipe 30 inside thereof.
[0069]
14 is a simplified cross-sectional view seen from the side of the charging means 131, FIG. 15 is a plan view of the charging means 131, and FIG. 16 is a left side of the charging means 131 in FIG. It is a front view. With reference to these drawings, the charging means 131 basically includes a guide member 171 and a protruding piece 172. The guide member 171 has a mounting surface 173. The mounting surface 173 is inclined downward as it approaches the inlet 118 of the heating furnace 116 (that is, toward the left in FIGS. 14 and 15). On this mounting surface 173, the compressed gas supply pipe 38 of the mold apparatus 131 and the adjustment rod 83 of the stopper 42 are mounted, so that the mold apparatus 31 has a posture in which the axis 35 is substantially horizontal, and It is mounted adjacent to the left and right of FIG. Therefore, the mold apparatus 31 rolls or slides on the mounting surface 173, and abuts against the projecting piece 172 fixed to the guide member 171 at the lower end portion 174 of the mounting surface 173, and below the mold apparatus 31 ( The displacement to the lower left of FIG. 14 is limited. The protrusion 172 protrudes above the mounting surface 173 and protrudes in the direction in which the pair of guide members 171 are close to each other. The guide members 171 are fixed on the support base 175 in pairs.
[0070]
17 is a side view of the receiver 153, and FIG. 18 is a front view of the receiver 153 as viewed from the inlet 118 side showing a state where the receiver 153 is attached to the pair of chains 147, and FIG. 19 is shown in FIG. It is a horizontal sectional view of composition. Referring to these drawings, the receiver 153 basically has a substantially C-shaped cross section, which is apparent from FIG. In the vicinity of the inlet 118, the receptacle 153 shown in FIG. 19 is displaced upward by the chain 147. The receiving device 153 connects the downstream receiving portion 177 downstream of the chain 147 in the traveling direction (upper side in FIG. 17), the upstream receiving portion 178 upstream of the chain 147, and the receiving portions 177 and 178. And a connecting portion 179. The downstream receiving portion 177 includes receiving pieces 180 and 181 connected in a V shape. The upstream receiving portion 178 includes a receiving piece 182 that is gently inclined at an angle θ1 with respect to the horizontal line, and a horizontal receiving piece 183. The angle θ1 may be 10 degrees, for example. The connecting piece 179 that connects the receiving pieces 181 and 183 extends vertically in FIG. 17, and the mounting bracket 184 is opposite to the receiving portions 177 and 178 of the connecting piece 179 (left side in FIG. 18, ie, closer to the chain 147). Fixed. A mounting seat 186 is integrally formed on the link 185 of the chain 147, and the end of the support member 187 is fixed to the mounting seat 186. The support member 187 extends horizontally in the width direction (left-right direction in FIG. 18) of the furnace body 117 of the heating furnace 116. The support member 187 is generally U-shaped and includes a mounting portion 188 and both side portions 189 thereof.
[0071]
Referring to FIG. 14 again, the downstream receiving portion 177 is formed in a direction perpendicular to the running direction 190 of the chain 147 and the pipe 32, and thus the axis 35 of the mold device 31 (the left-right direction in FIGS. 14 and 17). The free end portion 192 of the upstream receiving portion 178 protrudes to the right in FIGS. 14 and 17 by a horizontal distance L1 from the free end portion 191. The free end portion 191 of the downstream receiving portion 177 is slightly spaced from the end portion 193 of the projecting piece 172 on the side of the chain 147, and abuts against the projecting piece 172 to limit the downward displacement in FIG. A slight distance L3 is provided between the end 31b of the mold apparatus 31a near the chain 147. Therefore, when the downstream receiving portion 177 is displaced upward by the chain 147, it does not come into contact with or collide with the protruding piece 172 and the mold apparatus 31a.
[0072]
The free end portion 192 of the receiving piece 182 of the upstream receiving portion 178 is opposite to the chain 147 from the position 194 supported by the mounting surface 173 in the guide member 171 of the mold apparatus 31a (right side in FIG. 14). The horizontal distance is indicated by the reference symbol L4. The angle θ2 formed by the mounting surface 173 with the horizontal plane is, for example, 6 degrees, and is thus selected as θ1> θ2.
[0073]
Further, the vertical distance H1 between the free end portion 191 of the downstream receiving portion 177 and the free end portion of the upstream receiving portion 178 is selected to be a value that exceeds the maximum outer diameter D1 of the mold apparatus 31 received by the receiving tool 153. (That is, H1> D1) This enables the mold device 31 received by the upper and lower receiving portions 177 and 178 to be loaded and unloaded between the distances H1.
[0074]
20 is a cross-sectional view of the take-out / cooling means 132 viewed from the side, FIG. 21 is a plan view of the take-out / cooling means 132, and FIG. 22 is a view of the take-out / cooling means 132 seen from the right side of FIGS. It is a front view of a cooling means. With reference to these drawings, the take-out receptacle 141 is fixed to one end of the pair of arms 142 as described above. The take-out receiving tool 141 includes a receiving piece 201 that rises perpendicular to the longitudinal direction of the arm 142, a receiving piece 202 that faces the receiving piece 201 and is inclined upward as it moves away from the heating furnace 116, and these receiving pieces. And a connecting piece 203 that connects 201 and 202.
[0075]
Between the pair of receivers 153, a pair of guide members 171 and a pair of arms 142, and thus a pair of takeout receivers 141, are arranged. The arm 142 is assembled by constituting a frame with the reinforcing pieces 204 and 205. The drive shaft 206 is fixed near the reinforcing member 205 of the arm 142. The drive shaft 206 has a horizontal axis. The drive shaft 206 is rotatably supported by bearings 207 on both sides of the arm 142, and is connected to the rotary actuator 209 via the shaft coupling 208. As a result, the arm 142 is driven to reciprocate by an angle θ3 over a range from the horizontal position indicated by the solid line in FIG. 20 to the inclined position during cooling indicated by the phantom line 143. θ3 may be, for example, 30 degrees.
[0076]
The bearing 207 and the rotary actuator 209 are fixed on the moving table 211. The moving table 211 is guided by a pair of guide rails 213 extending toward the heating furnace 116 on a frame 212 provided at a fixed position, and in a horizontal direction in FIGS. 20 and 21 and a direction perpendicular to the paper surface in FIG. It can reciprocate and move sideways. The moving table 211 is driven in the lateral direction by a cylinder 213 having one end fixed to the frame 212. A rod 214 that is a drive unit of the cylinder 213 is connected to a lower portion of the moving body 211 by an attachment piece 215. Thus, in the take-out / cooling means 132, the take-out receiving tool 141, the arm 142, the table 211, and the cylinder 213 constitute the take-out means.
[0077]
An overflow wall 216 is erected on the bottom 217 of the storage tank 144 in the water tank 144 constituting the cooling means. Cooling water is continuously supplied from the supply port 218 of the bottom 217, and the water 145 overflows the upper end portion of the overflow wall 216 and is discharged from the discharge port 220 formed in the bottom 217 from the room 219. . The storage tank 144 is disposed between the heating furnace 116 and the gantry 212.
[0078]
With reference to FIG. 1 and FIGS. 20-22, the operation | movement which the mold apparatus 31 is taken out from the heating chamber 125, and compressed air is added and cooled is demonstrated. The mold apparatus 31 on the receiver 152 moves onto the take-out receiver 141 inserted into the heating chamber 125 as the receiver 152 is lowered. The mold device 31 on the take-out receiving tool 141 is taken out on the pedestal 212 by the arm 142, supplied with compressed air from one end 40, and the pipe 30 is expanded and expanded into a pipe 30a. Next, the arm 142 is inclined in the direction of the cooling water tank 144, and the mold device 31 on the take-out receiving tool 141 is placed in the cooling water tank 144 and cooled.
[0079]
FIG. 23 is a simplified side view of a synthetic resin pipe manufacturing apparatus 230 according to another embodiment of the present invention. The manufacturing apparatus 230 includes a heating furnace 231, a cooling water tank 232, and a conveying means 233, and the receiving tool 234 is conveyed in the direction of the arrow across the heating furnace 231 and the cooling water tank 232 by the conveying means 233. The mold unit 31 is placed on the receiving member 234 at the position 234a by the charging means 235, heated by the heating furnace 231, pressurized at the position 234b exiting the heating furnace 231, and placed in the cooling water tank 232, 234c. At this position, it is discharged from the receptacle 234 into the cooling water tank 232. The conveying means 233 and the charging means 235 have the same configuration as the conveying means 134 and the charging means 131 in the previous embodiment, and the shape of the receiver 234 is the same as that of the receiver 153 in the previous embodiment. Since it is the same, explanation is omitted.
[0080]
【The invention's effect】
As described above, according to the present invention, the expanded and porous tube can be reduced in the number of parts to be cut off and the yield can be improved. Further, a porous tube having a uniform diameter and a desired length can be mass-produced only by performing an operation of incorporating the tube into the mold apparatus and an operation of taking out the expanded pipe from the mold apparatus.
[Brief description of the drawings]
FIG. 1 is a simplified cross-sectional view of a mold apparatus 31 according to an embodiment of the present invention.
FIG. 2 shows a state in which a movable body 37 abuts against a stopper 42 and its displacement is limited.
3 is an enlarged cross-sectional view of a part of FIG. 1 in the vicinity of the holding means 36. FIG.
4 is a cross-sectional view of the vicinity of an attachment member 39 attached in the vicinity of one end portion 40 of a mold 34. FIG.
5 is a cross-sectional view showing the configuration of the holding means 36. FIG.
6 is a cross-sectional view showing a specific configuration of a moving body 37. FIG.
7 is a specific cross-sectional view of the stopper 42 and the mounting member 43. FIG.
8 is a view for explaining an operation when the product tube 30a after being molded and cooled in FIG. 2 is taken out from the mold 34 to obtain a product.
FIG. 9 is a simplified perspective view of a heating furnace 116 that constitutes a part of a thermoplastic synthetic resin pipe manufacturing apparatus according to an embodiment of the present invention.
FIG. 10 shows a heating furnace 116, a charging means 131 provided at the inlet 118 for individually loading the mold apparatus 31 into the inlet 118, and an outlet 119, and heated from the outlet 119. 5 is a cross-sectional view showing a take-out / cooling means 132 for individually taking out the mold apparatus 31 and cooling the taken-out mold apparatus 31. FIG.
11 is a plan view showing a heating furnace 116, charging means 131, and take-out / cooling means 132. FIG.
12 is a side view of the heating furnace 116, showing a heating means 123 and a driving means 135 for a conveying means 134. FIG.
13 is a cross-sectional view showing a configuration of a conveying means 134 in the heating chamber 125. FIG.
14 is a simplified cross-sectional view seen from the side of the charging means 131. FIG.
15 is a plan view of charging means 131. FIG.
16 is a front view of the charging means 131 viewed from the left in FIG.
17 is a side view of the receiving member 152. FIG.
18 is a front view seen from the inlet 118 side showing a state in which the receiving tool 152 is attached to a pair of chains 147. FIG.
19 is a horizontal cross-sectional view of the configuration shown in FIG.
FIG. 20 is a cross-sectional view of the take-out / cooling means 132 as seen from the side.
21 is a plan view of the take-out / cooling means 132. FIG.
22 is a front view of the take-out / cooling means viewed from the right side of FIGS. 20 and 21. FIG.
FIG. 23 is a simplified side view of still another embodiment of the present invention.
FIG. 24 is a cross-sectional view of a conventional synthetic resin pipe manufacturing apparatus.
[Explanation of symbols]
30 tubes
31 Mold equipment
32 One end
33 Other end
34 Mold
36 Holding means
37 Mobile
39, 43 Mounting member
42 Stopper
44 Fixed side holder
45 Holding member
46,76 storage hole
47,77 insertion hole
83 Adjustment member
116 Heating furnace
117 Furnace
118 entrance
119 Exit
123 Heating means
124 opening
125 Heating chamber
127 fans
131 Charging means
132 Removal / cooling means
134 Conveying means
135 Driving means
141 Retrieval receptacle
142 arms
144 Aquarium
147 Chiang
148-152 Sprocket wheel
153 Receiver
169 Driving means
170 motor
171 Guide member
173 riding surface
175 Support stand
184 bracket
185 links
186 Mounting seat
187 Support member
188 Mounting part

Claims

A cylindrical mold having a linear axis;
A holding means provided in the mold so as to be prevented from moving in the axial direction of the mold, detachably holding one end of the synthetic resin pipe, and having a passage communicating with the one end of the pipe; ,
A movable body provided in the mold so as to be movable in the axial direction of the mold, and closing the other end of the pipe;
Compressed fluid supply means for supplying compressed fluid to the passage of the holding means,
The holding means is
A fixed side holder,
A holding member that can be attached to and detached from the fixed side holder,
The fixed side holder is
Having a support that is in close proximity to or in contact with the inner peripheral surface of the mold;
A fixed-side holding hole having an axis on the same straight line as the axis of the mold and having an inner diameter that increases as the distance from the moving body is formed,
The holding member
It has a fixed-side fitting protrusion that fits into the fixed-side holding hole and decreases in outer diameter as it approaches the moving body,
In the fitting protrusion, a passage for supplying a compressed fluid opened to the moving body side is formed,
At the end of the fixed side holder opposite to the moving body, the fixed side holder and the holding member are screwed together,
A synthetic resin pipe manufacturing apparatus , wherein the one end of the pipe is sandwiched between a fixed holding hole and a fixed fitting protrusion .

The holding means is
A compressed fluid supply pipe fixed to the end of the holding member opposite to the moving body and insertable into the mold;
In the mold, the compressed fluid supply pipe is supported so that the axis of the compressed fluid supply pipe exists on the same straight line as the axis of the holding member, and the insertion length into the mold can be adjusted, and the mold The apparatus for manufacturing a synthetic resin pipe according to claim 1 , further comprising an attachment member fixed to the pipe.

The moving body
A moving holder,
Including a closing member detachable from the moving side holder,
The moving side holder is
Having a support that is in close proximity to or in contact with the inner peripheral surface of the mold;
A movement side holding hole having an axis that is collinear with the axis of the mold and having an inner diameter that increases as the distance from the holding means is formed,
The blocking member is
It has a moving side fitting projection that fits into the moving side holding hole and has an outer diameter that decreases as it approaches the holding means,
At the end of the moving side holder opposite to the holding means, the moving side holder and the closing member are screwed together,
Apparatus for manufacturing a synthetic resin tube according to claim 1 or 2, characterized in that for holding the other end portion of the tube between the movable holding hole and the moving-side fitting projection.

A cylindrical mold having a straight axis,
A holding means provided in the mold so as to be prevented from moving in the axial direction of the mold, detachably holding one end of the synthetic resin pipe, and having a passage communicating with the one end of the pipe; ,
A movable body provided in the mold so as to be movable in the axial direction of the mold, and closing the other end of the pipe;
A compressed fluid supply means for supplying a compressed fluid to the passage of the retaining means seen including,
The moving body
A moving holder,
Including a closing member detachable from the moving side holder,
The moving side holder is
Having a support that is in close proximity to or in contact with the inner peripheral surface of the mold;
A movement side holding hole having an axis that is collinear with the axis of the mold and having an inner diameter that increases as the distance from the holding means is formed,
The blocking member is
It has a moving side fitting projection that fits into the moving side holding hole and has an outer diameter that decreases as it approaches the holding means,
At the end of the moving side holder opposite to the holding means, the moving side holder and the closing member are screwed together,
A synthetic resin pipe manufacturing apparatus , wherein the other end of the pipe is sandwiched between a moving side holding hole and a moving side fitting projection .

The mold is provided with a stopper that abuts on the moving body and restricts the moving length of the other end of the tube along the axis of the mold so that the displacement can be adjusted in the axial direction of the mold. a manufacturing device of a synthetic resin pipe according to one of claims 1-4.

(A) a mold apparatus,
A cylindrical mold having a linear axis;
Hold in the mold that is prevented from moving in the axial direction of the mold, holds one end of the synthetic resin pipe in a detachable manner, and forms a passage communicating with the one end of the pipe. Means,
A mold apparatus having a movable body provided in the mold so as to be movable in the axial direction of the mold and closing the other end of the pipe;
(B) a heating furnace,
A furnace body formed with an inlet for charging the mold apparatus and an outlet for discharging the mold apparatus;
Conveying means for conveying the mold apparatus from the inlet to the outlet in the furnace,
A heating furnace having heating means for heating the mold apparatus in the furnace body during conveyance by the conveyance means;
(C) means for individually charging the mold apparatus at the inlet of the heating furnace;
(D) extraction means for individually removing the mold apparatus from the outlet of the heating furnace;
(E) cooling means for cooling the mold apparatus taken out from the outlet of the heating furnace by the take-out means;
(F) At least until the mold apparatus is cooled by the cooling means in the passage of the holding means of the mold apparatus provided in the vicinity of the extraction means and the cooling means and individually taken out from the outlet of the heating furnace by the extraction means , synthetic resin pipe manufacturing apparatus you; and a compressed fluid supply means for supplying a compressed fluid.

The conveying means of the heating furnace is
An endless annular rope stretched between the inlet and outlet of the furnace,
Drive means for driving the strip in one direction;
A plurality of receptacles having a substantially C-shaped cross section provided at intervals in the longitudinal direction of the rope, and receiving and supporting the mold in a substantially horizontal posture from the inlet to the outlet of the heating furnace. The synthetic resin pipe manufacturing apparatus according to claim 6 .

Each of the ropes has a stretch portion extending vertically at the entrance and exit of the heating furnace,
Driven in the direction of rising near the entrance and descending near the exit,
The charging means is
A guide member that has a mounting surface inclined downward as it approaches the entrance of the heating furnace, and on which the mold apparatus is mounted in a substantially horizontal posture and adjacent thereto,
The guide member has a protruding piece that is fixed at the lower end of the mounting surface and restricts the displacement of the mold apparatus,
The receiver is
A downstream side receiving portion on the downstream side in the running direction of the rope;
An upstream receiving portion on the upstream side,
The free end portion of the upstream receiving portion protrudes from the free end portion of the downstream receiving portion in a direction intersecting the running direction of the rope and the axis of the tube,
In the vicinity of the entrance of the heating furnace, at the free end portion of the upstream receiving portion, the mold device whose displacement is restricted by the protruding piece on the mounting surface is received from below when the rope is raised. The synthetic resin pipe manufacturing apparatus according to claim 7 .

The removal means is
An extraction receptacle that is opened upward to receive the mold apparatus supported by the downstream receiving portion in the vicinity of the outlet of the heating furnace,
An arm provided with a take-out receptacle at one end;
9. The apparatus for manufacturing a synthetic resin pipe according to claim 8, further comprising a lateral drive means for reciprocally moving the arm in a direction intersecting a traveling direction of the rope and an axis of the pipe .

The cooling means is
A storage tank disposed below the arm and storing the coolant;
An angular displacement driving means for immersing the mold device supported by the take-out receiving tool by reciprocating angular displacement driving the other end of the arm around the horizontal axis and taking it out from the cooling liquid is included. apparatus for manufacturing a synthetic resin tube according to claim 9, characterized in that.

The heating means
Form hot air passages over the openings formed above and below the heating chamber of the furnace body,
The synthetic resin pipe manufacturing apparatus according to any one of claims 6 to 10 , wherein a heating source and a fan for blowing hot air are provided in the middle of the hot air passage.

The synthetic resin pipe manufacturing apparatus according to any one of claims 1 to 11, wherein the synthetic resin pipe is porous .

The tube comprises a polytetrafluoroethylene polymer;
Resulting tube apparatus for manufacturing a synthetic resin tube according to one of claims 1 to 12, characterized in that it comprises a heat-shrinkable in the radial direction.