JP3753265B2

JP3753265B2 - Screw conveyor screw connection device

Info

Publication number: JP3753265B2
Application number: JP21058296A
Authority: JP
Inventors: 哲之糟谷; 淳一郎奥山; 恒夫杉平; 茂幸石倉
Original assignee: Komatsu Ltd
Current assignee: Komatsu Ltd
Priority date: 1996-07-22
Filing date: 1996-07-22
Publication date: 2006-03-08
Anticipated expiration: 2016-07-22
Also published as: JPH1037681A

Description

【０００１】
【発明の属する技術分野】
本発明は、地中に小口径管を推進して埋設する小口径管推進機のスクリューコンベヤのスクリュー接続装置に関する。
【０００２】
【従来の技術】
第１の従来技術として、図６，７に示す「実開平６−２７９９２」について説明する。図６は組立時の状態を示す図で、（Ａ）はスクリュー軸接続装置の側面断面図で、（Ｂ）は上面図、（Ｃ）は下面図であり、図７は組立完了時の状態を示す図である。
互いに接続すべきスクリュー軸５１，５２の一方に多角形状の嵌合部５１ａを、また他方に前記嵌合部５１ａが嵌合自在な継手部５２ｂを設け、これら嵌合部５１ａおよび継手部５２ｂにボルト孔５１ｂ，５２ｃを形成して、これらボルト孔５１ｂ，５２ｃに首部に圧縮バネ５４を嵌装した段付きボルト５３を挿入してナット５５で締め付けると共に、継手部５２ｂ側のボルト孔５２ｃの開口部に、ボルト５３の頭部５３ａおよびナット５５の回転を阻止する２面幅５２ｅ，５２ｇを有する凹部５２ｆ，５２ｈを形成して、スクリュー軸接続装置が構成されている。
【０００３】
図６（Ａ）において、段付きボルト５３を圧縮バネ５４に抗してＸ方向に押し付けた状態で、ナット５５を２面幅５２ｇに掛かるまで段付きボルト５３に締め付けた後、Ｘ方向に押し付けていた力を取り除くと図７の状態となり、ボルト５３の頭部５３ａは２面幅５２ｅにより、またナット５５は２面幅５２ｇにより回転を阻止するため、段付きボルト５３およびナット５５の緩みが防止される。
【０００４】
第２の従来技術として、図８に示す「実開平５−２２６９５」について説明する。図８（Ａ）はユニバーサルジョイント部の側面断面図、（Ｂ）は（Ａ）のＢ−Ｂ断面図である。
ユニバーサルジョイント６３は両端部に六角形状の嵌合凸部６３ａ，６３ｂが形成されている。これら嵌合凸部６３ａ，６３ｂに軸線と直交する方向にボルト孔６３ｃが穿孔されており、前記スクリュー軸６１，６２の端部に穿設されたボルト孔６１ｃ，６２ｃと嵌合凸部６３ａ，６３ｂに穿設されたボルト孔６３ｃにボルト６４を挿通することにより、各スクリュー軸６１，６２間がユニバーサルジョイント６３を介して、ボルト６４とボルト孔６３ｃとの隙間分だけ屈曲自在に結合されている。
一方前記スクリュー軸６１，６２の端部側外周は小径部６１ｄ，６２ｄが形成されていて、これら小径部６１ｄ，６２ｄにはフローティングシール６５が設けられている。
【０００５】
スクリュー軸６１，６２に引張力が作用しても各スクリュー軸６１，６２とユニバーサルジョイント６３の間がボルト６４で結合されているため、抜け外れることがないと共に、各スクリュー軸６１，６２の間に設けられたフローティングシール６５により土砂等がスクリュー軸６１，６２とユニバーサルジョイント６３の間に侵入するのを阻止する。
【０００６】
【発明が解決しようとする課題】
しかしながら、前記各従来技術の構成においては次の問題がある。
（１）第１の従来技術では、Ｘ方向に押し付けていた力を取り除くと、ナット５５が凹部５２ｈの底面に当たるまで移動するため、少なくともナット５５の高さだけ段付きボルト５３の頭５３ａが外方へ戻る。従ってナット５５あるいは段付きボルト５３の頭５３ａがスクリュー軸５２の継手部５２ｂ外面から突出して掘削土砂の搬送抵抗となる。
（２）また第１の従来技術では圧縮バネ５４や２面幅５２ｅ，５２ｇの加工が必要であると共に、組立操作が面倒となる。
（３）第２の従来技術では、ボルト６４の頭部およびダブルナットが各スクリュー軸６１，６２の外面から大きく突出するため、掘削土砂の搬送抵抗は第１の従来技術にも増して増大する。
【０００７】
本発明は上記の問題点に着目してなされたもので、スクリュー接続部における突出部をなくして掘削土砂の搬送抵抗を低減できると共に、組立の簡単なスクリューコンベヤのスクリュー接続装置を提供することを目的とする。
【０００８】
【課題を解決するための手段、および作用・効果】
上記の目的を達成するために、本発明に係るスクリューコンベヤのスクリュー接続装置の第１の発明においては、スクリューコンベヤを構成する複数のスクリューをトルク伝達可能に接続するためのスクリューコンベヤのスクリュー接続装置において、一方のスクリューに設置される嵌合軸部材と、前記嵌合軸部材にトルク伝達可能に嵌合するための、他方のスクリューに設置される嵌合穴部材と、円環の一部を切り欠いたＣ形リングを、長手方向中央部分に形成される小径部に嵌合してなるピンとを有し、前記嵌合軸部材には、前記Ｃ形リングの外径部が圧接するピン穴が前記嵌合軸部材を貫通するように形成されるとともに、前記嵌合穴部材には、前記嵌合軸部材と嵌合したときに、前記嵌合軸部材に形成されたピン穴に一致するように、前記ピンが通過可能なピン穴が前記嵌合穴部材を貫通するように形成されてなることを特徴とする。
【０００９】
第１の発明によれば、一方のスクリューに設置された嵌合軸部材が、他方のスクリューに設置された嵌合穴部材に嵌合することにより、複数のスクリューがトルク伝達可能に接続される。
嵌合軸部材と嵌合穴部材とに貫通するピン穴に嵌合するピンにより、嵌合軸部材と嵌合穴部材とが抜け止めされ、またピンは抜止め手段によりピン穴に対して抜け止めされる。
従ってピンの挿入・取り外しだけで各スクリュー相互の着脱が可能となり、前記各従来技術のようにボルト・ナットの締め付け、取り外しが不要となるため、スクリューの接続・取り外し作業時間が短縮される。
またスクリューからボルト・ナットなどが突出しないため、土砂の搬送抵抗が大幅に低減される。
Ｃ形リングの内径部はピンの長手方向中央部に形成された小径部に嵌合し、Ｃ形リングの外径部は嵌合軸部材に形成されたピン穴を圧接することにより、ピンはＣ形リングを介して嵌合軸部材により、軸方向に位置決めされてピンの抜け止めとなる。従って、Ｃ形リングを組み込んだピンをピン穴に押し込むだけでよいため、前記各従来技術に比較してスクリュー接続装置の構成が簡素化される。
【００１２】
本発明に係るスクリューコンベヤのスクリュー接続装置の第２の発明は、スクリューコンベヤを構成する複数のスクリューをトルク伝達可能に接続するためのスクリューコンベヤのスクリュー接続装置において、一方のスクリューに設置される嵌合軸部材と、前記嵌合軸部材にトルク伝達可能に嵌合するための、他方のスクリューに設置される嵌合穴部材と、円環の一部を切り欠いたＣ形リングを、長手方向中央部分に形成された小径部に嵌合してなるピンとを有し、前記嵌合軸部材にはピン穴が前記嵌合軸部材を貫通するように形成され、前記嵌合軸部材に形成されたピン穴は、長手方向中央部分に前記Ｃ形リングが嵌合する大径部を有する段付き形状とされ、前記嵌合穴部材には、前記嵌合軸部材と嵌合したときに、前記嵌合軸部材に形成されたピン穴に一致するように、前記ピンが通過可能なピン穴が前記嵌合穴部材を貫通するように形成されてなることを特徴とする。
【００１３】
第２の発明によれば、Ｃ形リングの内径部はピンに形成された小径部に嵌合し、Ｃ形リングの外径部は嵌合軸部材に形成されたピン穴の大径部に嵌合するため、嵌合軸部材に対するピンの抜け止めが確実となる。
【００１４】
本発明に係るスクリューコンベヤのスクリュー接続装置の第３の発明は、第２の発明において、前記Ｃ形リングの外径部は前記嵌合軸部材を貫通するピン穴の大径部に圧接することを特徴とする。
【００１５】
第３の発明によれば、Ｃ形リングの外径部が嵌合軸部材を貫通するピン穴の大径部を圧接して、Ｃ形リングを確実に嵌合軸部材に固定するため、ピンの抜け止めがさらに確実となる。
【００１６】
本発明に係るスクリューコンベヤのスクリュー接続装置の第４の発明は、第２の発明において、前記Ｃ形リングの外径部は前記嵌合軸部材を貫通するピン穴の大径部に遊嵌することを特徴とする。
【００１７】
第４の発明によれば、Ｃ形リングの内径部とピンに形成された小径部、またＣ形リングの外径部と嵌合軸部材のピン穴の大径部とは共に遊嵌状態となり、Ｃ形リングに応力が作用しないためＣ形リングの耐久性が向上する。
【００１８】
本発明に係るスクリューコンベヤのスクリュー接続装置の第５の発明は、第１、第２、第３又は第４の発明において、前記ピンは、前記嵌合軸部材に形成されたピン穴に嵌合するピン大径部と、前記嵌合穴部材に形成されたピン穴に嵌合するピン小径部と、これらピン大径部とピン小径部とを接続するテーパ部とを有することを特徴とする。
【００１９】
第５の発明によれば、嵌合軸部材に形成されたピン穴と、嵌合穴部材に形成されたピン穴とがずれていても、ピンに形成されたテーパ部によりピンを容易に挿入できる。また嵌合穴部材に形成されたピン穴とピンに形成されたピン小径部との隙間により、嵌合軸部材と嵌合穴部材とに隙間を形成すれば、接続されるスクリュー同志を傾斜させることができる。
【００２０】
【発明の実施の形態】
以下に本発明に係るスクリューコンベヤのスクリュー接続装置の各実施例について、図１〜図５を参照して詳述する。
図１は小口径管推進工法の概略を示す図、図２はスクリューコンベヤにおけるスクリュー接続装置の配置を示す図、図３は本発明に係るスクリュー接続装置の第１実施例を示す図、図４は本発明に係るスクリュー接続装置の第２実施例を示す図、図５は本発明に係るスクリュー接続装置の第３実施例を示す図である。
【００２１】
図１において、発進立坑１内に設置した小口径管推進機１０により、先導管１１の先端に装着されたカッタヘッド１１ａにより掘削しながら地中推進させた後、予めスクリューコンベヤ１２を収容した小口径管１３を小口径管推進機１０と先導管１１の間へ搬入し、先導管１１内のスクリューコンベヤ１２のスクリューと小口径管１３内のスクリューコンベヤ１２のスクリューとを接続して、先導管１１と同様にして地中推進させる。このようにして新しい小口径管１３を順次地中推進させることにより、到達立坑２まで小口径管１３が敷設される。
【００２２】
図２において、先導管１１後端のスクリューコンベヤ１２部には、スクリューコンベヤ１２のスクリューに作用する土砂搬送反力を支持するためのスラスト受け３が設置されている。このスラスト受け３の後部には小口径管１３内に装着されている、ケーシング１２ａとスクリュ１２ｂとからなるスクリューーコンベヤ１２が接続される。
前記スラスト受け３の前部には先導管１１内のスクリュー１２ｂと接続するための第１接続部Ｓがあり、スラスト受け３の後部には小口径管１３内に装着されるスクリュー１２ｂと接続するための第２接続部Ｔがあり、小口径管１３の後端には次の小口径管１３のスクリュー１２ｂと接続するための第３接続部Ｒが設置される。前記第１接続部Ｓ〜第３接続部Ｒには次に述べるスクリュー接続装置２０が装着される。
【００２３】
図３により本発明の第１実施例について説明する。
横断面が六角形状に形成さた嵌合軸２１ａを有する嵌合軸部材２１は一方のスクリュー１２ｂ端部に固定され、嵌合軸２１ａに嵌合する横断面が六角形状に形成された嵌合穴２２ａを有する嵌合穴部材２２は、他方のスクリュー１２ｂ端部に固定される。これら嵌合軸２１ａと嵌合穴２２ａとにはピン穴２１ｂ、２２ｂが貫通しており、このピン穴２１ｂ、２２ｂにはピン２３が嵌合している。
このピン２３は、嵌合軸２１ａに形成されたピン穴２１ｂに嵌合するピン大径部となる外周面２３ｂと、嵌合穴２２ａに形成されたピン穴２２ｂに嵌合するピン小径部となる端部外周面２３ｅと、これら外周面２３ｂと端部外周面２３ｅとを接続するテーパ部２３ｆとよりなる。
なお、嵌合軸部材２１と一方のスクリュー１２ｂ、あるいは嵌合穴部材２２と他方のスクリュー１２ｂとは同一部材でもよいことは勿論である。
ピン２３の長手方向中央部分に形成された小径部２３ａには、金属製円環の一部を切り欠いたＣ形リング２４の内径部２４ａが嵌合し、このＣ形リング２４はピン２３の小径部２３ａと外周面２３ｂとの段差部２３ｃ，２３ｄにより、ピン２３に対する軸方向の移動を規制されている。
【００２４】
またＣ形リング２４の外径部２４ｂはその弾性力により、嵌合軸２１ａに形成されたピン穴２１ｂを圧接してＣ形リング２４を嵌合軸２１ａに固定している。これらのＣ形リング２４、ピン２３の段差部２３ｃ，２３ｄ、およびＣ形リング２４の外径部２４ｂが圧接する嵌合軸２１のピン穴２１ｂとにより、ピン２３の抜止め手段２５が構成されている。
嵌合軸２１ａと嵌合穴２２ａ間には嵌合軸部材２１と嵌合穴部材２２とが屈折できるために僅かの隙間が設けられている。
【００２５】
以下に図３の作動について説明する。
一方のスクリュー１２ｂに設置された嵌合軸２１ａが、他方のスクリュー１２ｂに設置された嵌合穴２２ａに嵌合することにより、複数のスクリュー１２ｂがトルク伝達可能に接続される。
嵌合軸２１ａと嵌合穴２２ａとはこれらの間に貫通するピン穴２１ｂに嵌合されたピン２３により抜け止めされる。
Ｃ形リング２４の内径部２４ａはピン２３に形成された小径部２３ａに嵌合し、Ｃ形リング２４の外径部２４ｂは嵌合軸２１ａに形成されたピン穴２１ｂを圧接することにより、ピン２３はＣ形リング２４を介して嵌合軸２１ａにより、その軸方向に位置決めされてピン２３の抜け止めとなる。
【００２６】
各スクリュー１２ｂの接続・分離作業時には、嵌合軸２１ａと嵌合穴２２ａとに貫通するピン穴２１ｂに、小径部にＣ形リング２４を嵌合したピン２３を押し込めば、各スクリュー１２ｂは接続される。また嵌合軸２１ａと嵌合穴２２ａとに貫通するピン穴２１ｂから、ピン２３を押し出せば各スクリュー１２ｂは分離される。
従って前記各従来技術に比較してスクリュー接続装置２０の構成が簡素化されると共に、ピン２３の挿入・取り外しだけで各スクリュー１２ｂ相互の着脱が可能となり、スクリュー１２ｂの接続・分離作業時間が短縮される。
またスクリュー１２ｂからボルト・ナットなどが突出しないため、土砂の搬送抵抗が大幅に低減される。
更に嵌合軸２１ａに形成されたピン穴２１ｂと、嵌合穴２２ａに形成されたピン穴２２ｂとがずれていても、ピン２３に形成されたテーパ部２３ｆによりピン２３を容易に挿入できる。また嵌合軸部材２１と嵌合穴部材２２とか屈折しても、ピン２３の端部外周面２３ｅとピン穴２２ｂとに形成された隙間により、ピン２３にはスクリュー１２ｂのトルクが伝達しないため、ピン２３がピン穴２１ｂから抜け出すことを防止できる。
【００２７】
図４により本発明の第２実施例について説明する。なお図３に示す第１実施例と同様な部品には同一符号を付しその説明を省略する。
嵌合軸２１ａの軸方向中央部分に大径部２１ｃが形成され、この大径部２１ｃをＣ形リング２４の外径部２４ｂが圧接する以外は図３と同様である。
従って第２実施例におけるピン２３の抜止め手段３５は、Ｃ形リング２４と、ピン２３の段差部２３ｃ，２３ｄと、ピン穴２１ｂと嵌合軸２１ａの大径部２１ｃとの段差部２１ｄ，２１ｅと、Ｃ形リング２４が圧接する嵌合軸２１ａの大径部２１ｃとにより構成される。
【００２８】
以下に図４の作用について説明する。
Ｃ形リング２４は嵌合軸２１ａの段差部２１ｄ，２１ｅ、およびＣ形リング２４が嵌合軸２１ａの大径部２１ｃを圧接することにより、嵌合軸２１ａに対する軸方向の移動を規制され、またピン２３はその段差部２３ｃ，２３ｄにより、Ｃ形リング２４に対する軸方向の移動を規制される。従ってピン２３はＣ形リング２４を介して嵌合軸２１ａに対する軸方向の移動を規制されてピン２３の抜け止めとなる。
各スクリュー１２ｂの接続作業時には、小径部２３ａにＣ形リング２４を嵌合したピン２３をピン穴２１ｂに押し込むと、Ｃ形リング２４の外径部２４ｂが嵌合軸２１ａの大径部２１ｃに嵌合するため、Ｃ形リング２４が嵌合軸２１ａの大径部２１ｃを圧接すると共に、段差部２１ｄ，２１ｅにより、嵌合軸２１ａに対するＣ形リング２４の軸方向の移動が確実に規制され、ピン２３の抜け止め作用がより確実となる。
また各スクリュー１２ｂの分離作業時には、Ｃ形リング２４の外径部２４ｂが段差部２１ｄ，２１ｅを乗り越えるに必要な力をピン２３に与えれば、ピン２３がピン穴２１ｂから押し出されて各スクリュー１２ｂを分離できる。
【００２９】
図５により本発明の第３実施例について説明する。なお図４に示す第２実施例と同様な部品には同一符号を付してその説明を省略する。
嵌合軸２１ａの軸方向中央部分に、無荷重におけるＣ形リング２４の外径部２４ｂより大きい大径部２１ｃが形成されている以外は図４と同様である。
従って第３実施例におけるピン２３の抜止め手段４５は、Ｃ形リング２４と、ピン２３の段差部２３ｃ，２３ｄと、ピン穴２１ｂと嵌合軸２１ａの大径部２１ｃとの段差部２１ｄ，２１ｅとにより構成される。
【００３０】
Ｃ形リング２４は嵌合軸２１ａの段差部２１ｄ，２１ｅにより、嵌合軸２１ａに対する軸方向の移動を規制され、またピン２３はその段差部２３ｃ，２３ｄにより、Ｃ形リング２４に対する軸方向の移動を規制される。従ってピン２３はＣ形リング２４を介して嵌合軸２１ａに対する軸方向の移動を規制されてピン２３の抜け止めとなる。
ピン２３をピン穴２１ｂに挿入した状態で、嵌合軸２１ａの大径部２１ｃにＣ形リング２４の外径部２４ｂが圧接しないため、Ｃ形リング２４が無荷重状態となり、Ｃ形リング２４の耐久性が向上する以外は図４に示す第２実施例と同様のため説明を省略する。
【００３１】
各スクリュー１２ｂの接続・分離作業は、図４に示す第２実施例と同様のため説明を省略する。
【図面の簡単な説明】
【図１】小口径管推進工法の概略を示す図である。
【図２】スクリューコンベヤにおけるスクリュー接続装置の配置を示す図である。
【図３】本発明に係るスクリュー接続装置の第１実施例を示す図である。
【図４】本発明に係るスクリュー接続装置の第２実施例を示す図である。
【図５】本発明に係るスクリュー接続装置の第３実施例を示す図である。
【図６】第１の従来技術を示す図で、（Ａ）は組立状態を示すスクリュー軸接続装置の側面断面図、（Ｂ）は上面図、（Ｃ）は下面図である。
【図７】図６に示すスクリュー軸接続装置の組立完了時の状態を示す側面断面図である。
【図８】第２の従来技術を示す図で、（Ａ）はユニバーサルジョイントの側面断面図、（Ｂ）は（Ａ）のＢ−Ｂ断面図である。
【符号の説明】
１発進立坑
２到達立坑
３スクリュースラスト受け
１０小口径管推進機
１１先導管
１１ａカッタヘッド
１２スクリューコンベヤ
１２ａケーシング
１２ｂスクリュ
１３小口径管
２０スクリュー接続装置
２１嵌合軸部材
２１ａ嵌合軸
２１ｂ，２２ｂピン穴
２１ｃ大径部
２１ｄ，２１ｅ段差部
２２嵌合穴部材
２２ａ嵌合穴
２３ピン
２３ａ小径部
２３ｂ外周面
２３ｃ，２３ｄ段差部
２３ｅ端部外周面
２３ｆテーパ部
２４Ｃ形リング
２４ａ内径部
２４ｂ外径部
２５，３５，４５抜止め手段
Ｓ第１接続部
Ｔ第２接続部
Ｒ第３接続部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a screw connection device for a screw conveyor of a small-diameter tube propulsion machine that embeds a small-diameter tube in the ground.
[0002]
[Prior art]
As a first prior art, “Actual Hei 6-27992” shown in FIGS. 6A and 6B are diagrams showing a state at the time of assembly. FIG. 6A is a side sectional view of the screw shaft connecting device, FIG. 6B is a top view, FIG. 7C is a bottom view, and FIG. FIG.
A polygonal fitting portion 51a is provided on one of the screw shafts 51 and 52 to be connected to each other, and a joint portion 52b on which the fitting portion 51a can be freely fitted is provided on the other, and the fitting portion 51a and the joint portion 52b are provided. Bolt holes 51b and 52c are formed, and a stepped bolt 53 having a compression spring 54 fitted to the neck portion is inserted into these bolt holes 51b and 52c and tightened with a nut 55, and an opening of the bolt hole 52c on the joint portion 52b side is opened. The screw shaft connecting device is configured by forming recesses 52f and 52h having two surface widths 52e and 52g that prevent rotation of the head 53a of the bolt 53 and the nut 55 in the part.
[0003]
In FIG. 6A, in a state where the stepped bolt 53 is pressed against the compression spring 54 in the X direction, the nut 55 is tightened to the stepped bolt 53 until it reaches the two-surface width 52g, and then pressed in the X direction. 7 is removed, the head 53a of the bolt 53 is prevented from rotating by the two-surface width 52e, and the nut 55 is prevented from rotating by the two-surface width 52g. Therefore, the stepped bolt 53 and the nut 55 are loosened. Is prevented.
[0004]
As the second prior art, “Actual Hei 5-22695” shown in FIG. 8 will be described. FIG. 8A is a side sectional view of the universal joint portion, and FIG. 8B is a sectional view taken along line BB in FIG.
The universal joint 63 has hexagonal fitting projections 63a and 63b formed at both ends. Bolt holes 63c are drilled in the fitting convex portions 63a and 63b in a direction perpendicular to the axis, and the bolt holes 61c and 62c drilled in the end portions of the screw shafts 61 and 62 and the fitting convex portions 63a, By inserting the bolt 64 into the bolt hole 63c drilled in 63b, the screw shafts 61 and 62 are connected to each other through the universal joint 63 so as to be bent by the gap between the bolt 64 and the bolt hole 63c. Yes.
On the other hand, the outer circumferences of the screw shafts 61, 62 are formed with small diameter portions 61d, 62d, and a floating seal 65 is provided on the small diameter portions 61d, 62d.
[0005]
Even if a tensile force is applied to the screw shafts 61, 62, the screw shafts 61, 62 and the universal joint 63 are connected by bolts 64. The floating seal 65 provided on the bottom prevents dirt and sand from entering between the screw shafts 61 and 62 and the universal joint 63.
[0006]
[Problems to be solved by the invention]
However, the configuration of each prior art has the following problems.
(1) In the first prior art, when the force pressed in the X direction is removed, the nut 55 moves until it hits the bottom surface of the recess 52h, so the head 53a of the stepped bolt 53 is removed at least by the height of the nut 55. Return to Accordingly, the nut 55 or the head 53a of the stepped bolt 53 protrudes from the outer surface of the joint portion 52b of the screw shaft 52, and serves as a conveyance resistance for excavated soil.
(2) The first prior art requires processing of the compression spring 54 and the two-surface widths 52e and 52g, and the assembly operation is troublesome.
(3) In the second prior art, the head of the bolt 64 and the double nut protrude greatly from the outer surfaces of the screw shafts 61 and 62, so that the transport resistance of excavated earth and sand increases as compared with the first prior art. .
[0007]
The present invention has been made paying attention to the above-mentioned problems, and can provide a screw connection device for a screw conveyor that can be easily assembled while reducing the transport resistance of excavated earth and sand by eliminating the protrusions at the screw connection portion. Objective.
[0008]
[Means for solving the problems, and actions and effects]
In order to achieve the above object, in the first invention of the screw connection device of the screw conveyor according to the present invention, the screw connection device of the screw conveyor for connecting a plurality of screws constituting the screw conveyor so that torque can be transmitted. in a fitting shaft member that will be installed in one of the screw, for fitting to transmit torque to said fitting shaft member, and a fitting hole member that will be installed on the other of the screw, a part of the ring A pin hole formed by fitting a notched C-shaped ring to a small-diameter portion formed in a central portion in the longitudinal direction, and a pin hole in which the outer-diameter portion of the C-shaped ring is pressed into the fitting shaft member Is formed so as to pass through the fitting shaft member, and the fitting hole member coincides with a pin hole formed in the fitting shaft member when fitted to the fitting shaft member. like The pin is a pin hole can pass, characterized in that are formed so as to penetrate the fitting hole member.
[0009]
According to the first invention, the fitting shaft member installed in one screw is fitted into the fitting hole member installed in the other screw, so that the plurality of screws are connected so as to transmit torque. .
By a pin which fits into the pin hole penetrating in the fitting shaft member and the fitting hole member, is retained and the fitting shaft member and the fitting hole member, also pin missing with respect to the pin hole by the retaining means Stopped.
Accordingly, the screws can be attached / detached only by inserting / removing the pins, and the bolts / nuts are not tightened / removed as in the prior arts.
In addition, since bolts and nuts do not protrude from the screw, the transport resistance of earth and sand is greatly reduced.
The inner diameter part of the C-shaped ring is fitted into a small diameter part formed in the center part in the longitudinal direction of the pin, and the outer diameter part of the C-shaped ring is pressed by a pin hole formed in the fitting shaft member. The fitting shaft member is positioned in the axial direction via the C-shaped ring to prevent the pin from coming off. Therefore, since it is only necessary to push the pin incorporating the C-shaped ring into the pin hole, the configuration of the screw connection device is simplified as compared with the conventional techniques.
[0012]
A second invention of the screw connecting device of the screw conveyor according to the present invention is a screw connecting device of the screw conveyor for connecting a plurality of screws constituting the screw conveyor to transmit torque, fitted is placed on one of the screw A fitting shaft member, a fitting hole member installed in the other screw for fitting to the fitting shaft member so as to be able to transmit torque, and a C-shaped ring with a part of the ring cut out in the longitudinal direction and a pin made fitted to the small diameter portion formed in a central portion, said fitting shaft member is formed so that the pin hole penetrating through the fitting shaft member, formed on the fitting shaft member pin holes and, the C-shaped ring in the longitudinal direction center portion is a stepped shape having a large diameter portion for fitting, wherein the fitting hole member, when engaged with the engaging shaft member, the Shape on mating shaft member As to match the pin hole that is, the pin can pass the pin hole, characterized in that formed by formed through the fitting hole member.
[0013]
According to the second invention, the inner diameter portion of the C-shaped ring is fitted to the small diameter portion formed on the pin, and the outer diameter portion of the C-shaped ring is fitted to the large diameter portion of the pin hole formed on the fitting shaft member. for fitting, stopper pins is ensured for the fitting shaft member.
[0014]
A third invention of the screw connecting device of the screw conveyor according to the present invention, in the second aspect, the outer diameter of the C-shaped ring that presses against the large diameter portion of the pin hole extending through the fitting shaft member It is characterized by.
[0015]
According to the third invention, since the outer diameter portion of the C-shaped ring is pressed against the large-diameter portion of the pin hole through the fitting shaft member is fixed to ensure that fitting shaft member C-shaped ring, the pin It is even more secure to prevent
[0016]
A fourth invention of the screw connecting device of the screw conveyor according to the present invention, in the second aspect, the outer diameter of the C-shaped ring is loosely fitted in the large diameter portion of the pin hole extending through the fitting shaft member It is characterized by that.
[0017]
According to the fourth invention, the inner diameter portion of the C-shaped ring and the small diameter portion formed on the pin, and the outer diameter portion of the C-shaped ring and the large diameter portion of the pin hole of the fitting shaft member are both loosely fitted. Since the stress does not act on the C-shaped ring, the durability of the C-shaped ring is improved.
[0018]
A fifth invention of the screw connecting device of the screw conveyor according to the present invention, in the first, second, third or fourth invention, the pin is fitted into the pin hole formed in the fitting shaft member to Surupin a large-diameter portion, and a pin diameter portion fitted into the pin hole formed in the fitting hole member, characterized in that it has a tapered portion connecting the these pins large diameter portion and the pin small diameter portion .
[0019]
According to 5th invention, even if the pin hole formed in the fitting shaft member and the pin hole formed in the fitting hole member have shifted | deviated, a pin is easily inserted by the taper part formed in the pin it can. Also the gap between the pin small diameter portion formed in the pin hole and the pin formed in the fitting hole member, by forming the gap and fitting shaft member and the fitting hole member, tilting the screw comrades connected be able to.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the screw connection device for a screw conveyor according to the present invention will be described below in detail with reference to FIGS.
1 is a diagram showing an outline of a small-diameter pipe propulsion method, FIG. 2 is a diagram showing an arrangement of screw connection devices in a screw conveyor, FIG. 3 is a diagram showing a first embodiment of a screw connection device according to the present invention, FIG. FIG. 5 is a view showing a second embodiment of the screw connection device according to the present invention, and FIG. 5 is a view showing a third embodiment of the screw connection device according to the present invention.
[0021]
In FIG. 1, a small-diameter pipe propelling machine 10 installed in the start shaft 1 is propelled underground while being excavated by a cutter head 11 a attached to the tip of a leading conduit 11, and then a small screw conveyor 12 is accommodated in advance. The diameter pipe 13 is carried between the small diameter pipe propulsion machine 10 and the leading pipe 11, and the screw of the screw conveyor 12 in the leading pipe 11 and the screw of the screw conveyor 12 in the small diameter pipe 13 are connected. Proceed underground as in 11. In this way, the small-diameter pipe 13 is laid down to the reaching shaft 2 by sequentially propelling the new small-diameter pipe 13 in the ground.
[0022]
In FIG. 2, a thrust receiver 3 for supporting the earth-and-sand conveying reaction force acting on the screw of the screw conveyor 12 is installed in the screw conveyor 12 portion at the rear end of the front conduit 11. A screw conveyor 12 comprising a casing 12a and a screw 12b, which is mounted in a small-diameter pipe 13, is connected to the rear portion of the thrust receiver 3.
The thrust receiver 3 has a first connection portion S for connecting to the screw 12b in the front conduit 11 at the front portion, and the rear portion of the thrust receiver 3 is connected to the screw 12b mounted in the small-diameter pipe 13. There is a second connection portion T for connecting the screw 12b of the next small-diameter pipe 13 to the rear end of the small-diameter pipe 13. The first connecting portion S to the third connecting portion R are equipped with a screw connecting device 20 described below.
[0023]
A first embodiment of the present invention will be described with reference to FIG.
The fitting shaft member 21 having the fitting shaft 21a whose cross section is formed in a hexagonal shape is fixed to the end of one screw 12b, and the cross section that fits the fitting shaft 21a is formed in a hexagonal shape. The fitting hole member 22 having the hole 22a is fixed to the end of the other screw 12b. Pin holes 21b and 22b pass through the fitting shaft 21a and the fitting hole 22a, and a pin 23 is fitted into the pin holes 21b and 22b.
The pin 23 includes an outer peripheral surface 23b that is a large-diameter portion that fits into a pin hole 21b formed in the fitting shaft 21a, and a small-diameter portion that fits into a pin hole 22b formed in the fitting hole 22a. End outer peripheral surface 23e, and a tapered portion 23f connecting the outer peripheral surface 23b and the end outer peripheral surface 23e.
Of course, the fitting shaft member 21 and the one screw 12b or the fitting hole member 22 and the other screw 12b may be the same member.
An inner diameter portion 24 a of a C-shaped ring 24 in which a part of a metal ring is cut out is fitted into a small-diameter portion 23 a formed in the center portion in the longitudinal direction of the pin 23, and the C-shaped ring 24 is connected to the pin 23. Movement in the axial direction with respect to the pin 23 is restricted by the step portions 23c and 23d between the small diameter portion 23a and the outer peripheral surface 23b.
[0024]
Further, the outer diameter portion 24b of the C-shaped ring 24 presses a pin hole 21b formed in the fitting shaft 21a by its elastic force to fix the C-shaped ring 24 to the fitting shaft 21a. The C-shaped ring 24, the stepped portions 23 c and 23 d of the pin 23, and the pin hole 21 b of the fitting shaft 21 with which the outer diameter portion 24 b of the C-shaped ring 24 comes into pressure contact constitutes a retaining means 25 for the pin 23. ing.
A slight gap is provided between the fitting shaft 21a and the fitting hole 22a because the fitting shaft member 21 and the fitting hole member 22 can be refracted.
[0025]
The operation of FIG. 3 will be described below.
When the fitting shaft 21a installed in one screw 12b is fitted into the fitting hole 22a installed in the other screw 12b, the plurality of screws 12b are connected to transmit torque.
The fitting shaft 21a and the fitting hole 22a are prevented from coming off by a pin 23 fitted in a pin hole 21b penetrating therebetween.
An inner diameter portion 24a of the C-shaped ring 24 is fitted into a small diameter portion 23a formed on the pin 23, and an outer diameter portion 24b of the C-shaped ring 24 is pressed against a pin hole 21b formed in the fitting shaft 21a. The pin 23 is positioned in the axial direction by the fitting shaft 21 a via the C-shaped ring 24, thereby preventing the pin 23 from coming off.
[0026]
At the time of connecting / disconnecting each screw 12b, each screw 12b is connected by pushing a pin 23 fitted with a C-shaped ring 24 into a small diameter portion into a pin hole 21b penetrating the fitting shaft 21a and the fitting hole 22a. Is done. Moreover, if the pin 23 is pushed out from the pin hole 21b which penetrates the fitting shaft 21a and the fitting hole 22a, each screw 12b will be isolate | separated.
Accordingly, the configuration of the screw connection device 20 is simplified as compared with each of the prior arts, and the screws 12b can be attached to and detached from each other only by inserting and removing the pins 23, thereby shortening the time for connecting and separating the screws 12b. Is done.
In addition, since bolts and nuts do not protrude from the screw 12b, earth and sand conveyance resistance is greatly reduced.
Furthermore, even if the pin hole 21b formed in the fitting shaft 21a and the pin hole 22b formed in the fitting hole 22a are displaced, the pin 23 can be easily inserted by the tapered portion 23f formed in the pin 23. Further, even if the fitting shaft member 21 and the fitting hole member 22 are refracted, the torque of the screw 12b is not transmitted to the pin 23 due to a gap formed between the end outer peripheral surface 23e of the pin 23 and the pin hole 22b. The pin 23 can be prevented from coming out of the pin hole 21b.
[0027]
A second embodiment of the present invention will be described with reference to FIG. Components similar to those in the first embodiment shown in FIG. 3 are denoted by the same reference numerals and description thereof is omitted.
A large-diameter portion 21c is formed in the central portion of the fitting shaft 21a in the axial direction, and this large-diameter portion 21c is the same as FIG. 3 except that the outer-diameter portion 24b of the C-shaped ring 24 is pressed.
Therefore, the retaining means 35 for the pin 23 in the second embodiment includes the C-shaped ring 24, the step portions 23c and 23d of the pin 23, the step portions 21d of the pin hole 21b and the large diameter portion 21c of the fitting shaft 21a. 21e and the large-diameter portion 21c of the fitting shaft 21a with which the C-shaped ring 24 is pressed.
[0028]
The operation of FIG. 4 will be described below.
The C-shaped ring 24 is restricted from moving in the axial direction with respect to the fitting shaft 21a when the stepped portions 21d and 21e of the fitting shaft 21a and the C-shaped ring 24 press-contact the large-diameter portion 21c of the fitting shaft 21a. Further, the axial movement of the pin 23 relative to the C-shaped ring 24 is restricted by the step portions 23c and 23d. Accordingly, the pin 23 is restricted from moving in the axial direction with respect to the fitting shaft 21 a via the C-shaped ring 24, thereby preventing the pin 23 from coming off.
When connecting each screw 12b, when the pin 23 fitted with the C-shaped ring 24 into the small-diameter portion 23a is pushed into the pin hole 21b, the outer-diameter portion 24b of the C-shaped ring 24 becomes the large-diameter portion 21c of the fitting shaft 21a. For fitting, the C-shaped ring 24 presses the large-diameter portion 21c of the fitting shaft 21a and the axial movement of the C-shaped ring 24 with respect to the fitting shaft 21a is reliably restricted by the step portions 21d and 21e. The pin 23 can be more reliably prevented from coming off.
Further, at the time of separating each screw 12b, if the outer diameter portion 24b of the C-shaped ring 24 gives the pin 23 the force necessary to get over the stepped portions 21d and 21e, the pin 23 is pushed out from the pin hole 21b and each screw 12b. Can be separated.
[0029]
A third embodiment of the present invention will be described with reference to FIG. Parts similar to those of the second embodiment shown in FIG.
4 except that a large diameter portion 21c larger than the outer diameter portion 24b of the C-shaped ring 24 under no load is formed in the center portion in the axial direction of the fitting shaft 21a.
Therefore, the retaining means 45 of the pin 23 in the third embodiment includes the C-shaped ring 24, the stepped portions 23c and 23d of the pin 23, the stepped portion 21d of the pin hole 21b and the large diameter portion 21c of the fitting shaft 21a. 21e.
[0030]
The C-shaped ring 24 is restricted from moving in the axial direction with respect to the fitting shaft 21a by the step portions 21d and 21e of the fitting shaft 21a, and the pin 23 is controlled in the axial direction with respect to the C-shaped ring 24 by the step portions 23c and 23d. Restricted to move. Accordingly, the pin 23 is restricted from moving in the axial direction with respect to the fitting shaft 21 a via the C-shaped ring 24, thereby preventing the pin 23 from coming off.
In a state where the pin 23 is inserted into the pin hole 21b, the outer diameter portion 24b of the C-shaped ring 24 is not pressed against the large-diameter portion 21c of the fitting shaft 21a. Except for improving the durability of the second embodiment, the description is omitted because it is the same as the second embodiment shown in FIG.
[0031]
The connection / separation work of each screw 12b is the same as that of the second embodiment shown in FIG.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a small-diameter pipe propulsion method.
FIG. 2 is a diagram showing an arrangement of screw connection devices in a screw conveyor.
FIG. 3 is a diagram showing a first embodiment of a screw connection device according to the present invention.
FIG. 4 is a view showing a second embodiment of the screw connection device according to the present invention.
FIG. 5 is a view showing a third embodiment of the screw connection device according to the present invention.
6A and 6B are views showing the first prior art, in which FIG. 6A is a side sectional view of a screw shaft connecting device showing an assembled state, FIG. 6B is a top view, and FIG.
7 is a side cross-sectional view showing a state when the assembly of the screw shaft connecting device shown in FIG. 6 is completed. FIG.
8A and 8B are views showing a second prior art, in which FIG. 8A is a side sectional view of a universal joint, and FIG. 8B is a sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Start shaft 2 Reach shaft 3 Screw thrust receptacle 10 Small diameter pipe propulsion machine 11 Lead pipe 11a Cutter head 12 Screw conveyor 12a Casing 12b Screw 13 Small diameter pipe 20 Screw connection device 21 Fitting shaft member 21a Fitting shaft 21b, 22b Pin Hole 21c Large diameter portion 21d, 21e Stepped portion 22 Fitting hole member 22a Fitting hole 23 Pin 23a Small diameter portion 23b Outer peripheral surface 23c, 23d Stepped portion 23e End outer peripheral surface 23f Taper portion 24 C-shaped ring 24a Inner diameter portion 24b Outer diameter Parts 25, 35, 45 retaining means S first connection part T second connection part R third connection part

Claims

In a screw connection device of a screw conveyor for connecting a plurality of screws constituting a screw conveyor so that torque can be transmitted,
A fitting shaft member that will be installed in one of the screw,
A fitting hole member where the fitting shaft member for fitting to transmit torque, the Ru is installed in the other of the screw,
Having a pin formed by fitting a C-shaped ring with a part of the ring cut out into a small-diameter portion formed in the central portion in the longitudinal direction;
In the fitting shaft member, a pin hole with which the outer diameter portion of the C-shaped ring presses is formed so as to penetrate the fitting shaft member,
The fitting hole member has a pin hole through which the pin can pass so as to coincide with a pin hole formed in the fitting shaft member when fitted with the fitting shaft member. A screw connection device for a screw conveyor, wherein the screw connection device is formed so as to penetrate the member .

In a screw connection device of a screw conveyor for connecting a plurality of screws constituting a screw conveyor so that torque can be transmitted ,
A fitting shaft member installed on one screw;
A fitting hole member installed on the other screw for fitting the fitting shaft member so that torque can be transmitted; and
Having a pin formed by fitting a C-shaped ring with a part of the ring cut out into a small-diameter portion formed in the central portion in the longitudinal direction ;
Wherein the fitting shaft member is formed such that the pin holes through said fitting shaft member, the pin holes formed in the fitting shaft member is large that the C-ring in the longitudinal direction center portion is fitted It is a stepped shape with a diameter part ,
The fitting hole member has a pin hole through which the pin can pass so as to coincide with a pin hole formed in the fitting shaft member when fitted with the fitting shaft member. A screw connection device for a screw conveyor, wherein the screw connection device is formed so as to penetrate the member .

In screw connection device, for a screw conveyor according to claim 2, wherein the outer diameter of the C-shaped ring screw connection device of the screw conveyor, characterized in that pressed against the large-diameter portion of the pin hole extending through the fitting shaft member .

In screw connection device, for a screw conveyor according to claim 2, wherein the outer diameter of the C-shaped ring screw connections screw conveyor, characterized in that the loosely fitted to the large diameter portion of the pin hole extending through the fitting shaft member apparatus.

Claim 1, in the screw connecting device of the screw conveyor according to 2, 3 or 4, wherein the pin includes a pin large-diameter portion to be fitted into the pin hole formed in the fitting shaft member, said fitting hole member a pin diameter portion fitted into the pin hole formed in the screw connecting device of the screw conveyor and having a tapered portion that connects with these pins large diameter portion and the pin small diameter portion.