JP4445101B2

JP4445101B2 - Pipe connection structure in the spreader

Info

Publication number: JP4445101B2
Application number: JP2000169948A
Authority: JP
Inventors: 徹野村
Original assignee: New Delta Industrial Co Ltd
Current assignee: New Delta Industrial Co Ltd
Priority date: 2000-06-07
Filing date: 2000-06-07
Publication date: 2010-04-07
Anticipated expiration: 2020-06-07
Also published as: JP2001349483A

Description

【０００１】
【発明の属する技術分野】
本発明は、背負式や定置式の動力散布機等の散布機に関し、特に、散布機と該散布機に接続する噴管の連結構造に関する。
【０００２】
【従来の技術】
従来、背負式動力散布機によって、粒状の肥料や薬剤等を散布することは行われている。通常、散布機は粉剤や粒剤等の肥料や液剤等を散布することが可能であり、薬剤タンクとブロワーケースとの間にシャッター装置を介装し、ブロワーケース内へ落下させる薬剤量を、該シャッター装置により調節可能としており、薬剤や肥料等に合わせてシャッターや噴管等が交換される。そして、散布する薬剤の大きさや散布する範囲に合わせて散布機に連結する噴管も選択されて、粒剤が均一に散布されるようにしている。従って、このような散布機においては、該散布機のブロワーケースの端に貫装されたベンド管の噴出口に、フレキシブルパイプである蛇管（ジャバラ状の管）を接続し、該蛇管に回動自在なジョイントを介して作業に適当な噴管を着脱可能に接続していた。
【０００３】
【発明が解決しようとする課題】
しかし、上述の従来の散布機における散布機と噴管の連結部の構造では、回動自在なジョイントと噴管の連結部で、急激に内径が縮小され、この部分の圧力が高くなるために、薬剤が漏出することがあった。特に、ブロワーケースはブロー成形により成形すると型の継ぎ目部分が真円とならず、この部分に隙間ができて薬剤が漏れ易かったのである。
【０００４】
【課題を解決するための手段】
本発明の解決しようとする課題は以上の如くであり、次にこの課題を解決するための手段を説明する。
【０００５】
請求項１においては、粒剤や粉剤等の薬剤を散布するために動力散布機の噴出口に、蛇管（３１）を接続し、該蛇管（３１）に回動自在な回動ジョイント（Ｋ）を介して噴管（５）を接続する、散布機における噴管（５）の連結構造において、前記回動ジョイント（Ｋ）は、該蛇管（３１）側に取り付けた蛇管側部材（３９）、及び噴管（５）側に取り付けた噴管側部材（３６）から構成し、該蛇管側部材（３９）を内に、該噴管側部材（３６）を外に同心的に嵌合し、当接面で摺動しながら回動可能に構成し、該噴管側部材（３６）には、前記噴管（５）の嵌合部（５ａ）に嵌合する中空状の回動部（３６ａ）と、該噴管（５）に設けたテーパ部（５ｂ）の内輪に沿う、該回動部（３６ａ）の端部から徐々に絞って直径を小さくした円錐台状のテーパ部（３６ｂ）を形成し、該噴管側部材（３６）は該蛇管側部材（３９）の外輪、及び噴管（５）の内輪に嵌合し、該噴管側部材（３６）の回動部（３６ａ）の外周には、該噴管（５）を係止する為に２つの係止突起（３５・３５）を、所定間隔をあけて成形加工し、該２つの係止突起（３５・３５）は断面視凹状に構成し中央が凹状で、先端には爪（３５ａ）を成形し、前記噴管（５）の嵌合部（５ａ）には、前記２つの係止突起（３５・３５）を挿入し、係止する２本のガイド（２９・２９）を成形し、該２本のガイド（２９・２９）はＬ字型で、該係止突起（３５）の位置を合わせて挿入するガイド入り口（２９ａ）を設け、該ガイド（２９）のＬ字の終点の位置に、前記係止突起（３５）の爪（３５ａ）が嵌入しストッパー（２９ｂ）となる窪みを成形したものである。
【０００６】
【発明の実施の形態】
次に、本発明の実施の形態を説明する。
【０００７】
図１は本発明の実施例に係る背負式動力散布機の全体的な構成を示した正面図、図２は同じく散布機と噴管の結合部における断面図である。図３は本発明に係る散布機と噴管の連結構造を採用した回動ジョイントを示す図であり、図４は図３に示す回動ジョイントの蛇管側部材を示す図であり、図５は同じく回動ジョイントの噴管側部材を示す図である。図６は噴管における回動ジョイントとの連結部を示す図であり、図７は回動ジョイントと噴管を連結する突起の断面図である。また、図８は従来の散布機と噴管の連結構造を採用した蛇管と噴管の連結部を示す図である。
【０００８】
まず、本発明に係る散布機の全体構成について説明する。図１に示す散布機２０は、例えば、背負式動力散布機に構成されており、上部に薬剤タンク１１を、下部にブロワーケース１２を配置している。該薬剤タンク１１及びブロワーケース１２は、それぞれ樹脂をブロー成形することによって一体的に形成されている。
【０００９】
ブロワーケース１２にはエンジン１３が、また該ブロワーケース１２内には図示せぬ送風ファンが配置されている。該送風ファンはエンジン１３の出力軸に固設され、該出力軸と一体的に回転して送風を行うように構成している。前記薬剤タンク１１やブロワーケース１２やエンジン１３等は、側面視略「Ｌ」字形状に形成した背負枠３上に載置されている。また、エンジン１３には燃料タンク７、エアクリーナー８が付設されている。該燃料タンク７はエンジン１３よりも下方に配置している為、燃料を上方のエンジン１３まで強制的に送り出すために、燃料タンク７上部にパルスポンプ９を設けている。
【００１０】
前記薬剤タンク１１とブロワーケース１２との間にはシャッター収納部１４が介装されており、該シャッター収納部１４内には、ロータリーシャッター装置４７とダンパーシャッター装置４６を収納し、ブロワーケース１２の一側部に設けたベンド管３０の噴出口には噴管５が連結されている。また、ブロワーケース１２の他側部には、レバーガイド４を設けて、該レバーガイド４にアクセルレバー１０を回動可能に取り付けるとともに、薬剤の調量レバー４９を該レバーガイド４の後方へ回動可能に突出している。
【００１１】
調量レバー４９を回動操作することにより該調量レバー４９に連結された調量ロッド４８が上下移動し、これにより前記ロータリーシャッター装置４７又はダンパーシャッター装置４６の開度を変化させて薬剤の散布量を調節することができる。また、前記アクセルレバー１０を回動操作することによりエンジン１３の回転数を変化させ、該エンジン１３により駆動されるブロワーケース１２内の送風ファンジョイントの送風量を調節することができる。
【００１２】
ブロワーケース１２内には、ロータリーシャッター装置４７及びダンパーシャッター装置４６の下方から、ベンド管３０の噴出口近傍にかけて、薬剤案内ガイド筒２７が配設されている。該薬剤案内ガイド筒２７で、薬剤タンク１１から落下した薬剤は各シャッター装置４６・４７を通過して、ブロワーケース１２内に侵入した薬剤を、ベンド管３０の噴出口まで案内し、該ベンド管３０に蛇管３１及び回動自在なジョイントＫを介して連結された噴管５から薬剤が散布される。
【００１３】
このように構成した散布機２０を圃場内で背負いつつ、エンジン１３の駆動によりブロワーケース１２内の送風ファンを駆動させ、アクセルレバー１０の回動操作によりエンジン回転数を変化させて送風量の調節を行うとともに、調量レバー４９の回動操作により、前記ロータリーシャッター装置４７、又はダンパーシャッター装置４６の開度を変化させて薬剤の散布量を調節しながら、噴管５を通じて薬剤の散布を行うのである。
【００１４】
ここで、本発明に係る散布機２０と噴管５の結合部の構造に関して詳説する。図１に示す噴管５は、吐出孔を備えたパイプが連結され、該噴出口より薬剤が散布される。散布機２０は異なる形状の噴管５を目的に応じて交換することで、多種多様の薬剤及び散布方法に適応する。従って、本実施例は噴管５の一例として、図１に示す形状のパイプ状の管を噴管として用いているのであって、接続する噴管５の形状を限定しているものではない。
【００１５】
図１及び図２に示す如く、散布機２０におけるブロワーケース１２先端のベンド管３０の噴出口に連結したフレキシブルパイプである蛇管３１がワイヤクランプ３２によって締め上げられ、抜け止めが為されている。前記蛇管３１を介して噴管５を連結することで、噴管５の動きを自由にしている。
【００１６】
前記蛇管３１には、図３に示す、回動自在な回動ジョイントＫを介して噴管５が接続されて、噴管５を回動自在としている。前記回動ジョイントＫは蛇管３１側及び噴管５側に夫々取り付ける蛇管側部材３９及び噴管側部材３６から構成されており、これらの部材３６・３９を同心的に嵌合すると該部材３６・３９の当接面で摺動しながら回動する。
【００１７】
まず、図２乃至図４を用いて、前記回動ジョイントＫを構成する、蛇管３１に嵌合する蛇管側部材３９について説明する。前記蛇管側部材３９は環状のパイプに複数多種の環状突起が設けられた形状となっている。蛇管３１との嵌合部Ｌに設けられた環状突起３９ａ・３９ａ・・に、散布機２０のベンド管３０に連結された蛇管３１を嵌めて、ワイヤクランプ３３で締め上げることで該蛇管側部材３９と蛇管３１とを連結している。また、回動ジョイントＫの回動部Ｍである噴管側部材３６の嵌合部には、支持用及び係止用の環状突起３９ｄ・３９ｄ・・３９ｃが設けられている。係止用突起３９ｃは支持用突起３９ｄ・３９ｄ・・の間に、支持用突起３９ｄよりも、大きく外側へ突出するよう成形されており、該係止用突起３９ｃが噴管側部材３６の係止用窪み３８により抜け止めが為されても、支持用突起３９ｄは噴管側部材３６の内輪に当接して回動摺動するようになっている。
【００１８】
一方、回動ジョイントＫを構成する、噴管５に嵌められる噴管側部材３６は、図２、図３及び図５に示す如く、中空状のパイプに回動部３６ａと、該回動部３６ａの端部から徐々に絞って直径を小さくした円錐台状のテーパ部３６ｂを形成している。前記回動部３６ａには、内側に蛇管側部材３９を係止するための窪みを構成する環状突起３８、及び、断面視凹状に構成して噴管５を係止するための係止突起３５・３５が所定間隔をあけて外周に成形加工されている。また、噴管側部材３６には、噴管５の嵌合部５ａ及びテーパ部５ｂの内輪に沿うよう、これらの形状に合わせてテーパ部３６ｂが設けられており、回動ジョイントＫと噴管５の連結部の回動部Ｍからテーパ部Ｎに渡って、回動ジョイントＫの蛇管側部材３９の外輪及び噴管５の内輪に嵌合している。
【００１９】
上述の蛇管側部材３９に、該蛇管側部材３９に設けられた突起３９ｂに当接するまで噴管側部材３６を同心的に挿入すると、蛇管側部材３９に設けられた係止突起３９ｃが噴管側部材３６の係止用窪み３８で係止されて、二つの部材３６・３９が連結し回動ジョイントＫを構成している。そして、該回動ジョイントＫの回動部Ｍにおいて、蛇管側部材３９の支持突起３９ｄ・３９ｄ・・が噴管側部材３６の内輪に当接しており、該支持突起が噴管側部材３６の内側を摺動しながら夫々の部材３６・３９が回動する。従って、蛇管側部材３９及び噴管側部材３６の二つの部材を嵌合することで構成される回動自在な回動ジョイントＫ及び蛇管３１を介して、散布機２０と噴管５を回動自在に連結することで、散布時における噴管５の操縦が非常に良好になる。
【００２０】
噴管５は圃場や薬剤の種類に合わせて複数のパイプを介して連結して長さを調節できるように構成されており、該噴管５の最も散布機側に位置するパイプは、図２及び図６に示す如く、噴管５を支え操作するための把手３４が付設され、また、散布機２０と噴管５を蛇管３１及び回動ジョイントＫを介して連結するための嵌合部５ａが成形されている。該嵌合部５ａより把手３４の付け根近傍までは、テーパ部５ｂとなっており、噴管５の本パイプから嵌合部５ａにかけて徐々に口径が大きくなるようブロー成形されている。
【００２１】
また、前記噴管５の嵌合部５ａには噴管側部材３６の係止突起３５・３５を挿入し、これを係止するためのガイド２９・２９が係止突起３５・３５に位置を合わせて成形されている。該ガイド２９はＬ字型で、ガイド入り口２９ａより噴管側部材３６の係止突起３５を挿入し、該係止突起３５がＬ字の角までたどり着くと、次に係止突起３５がガイド２９の終点に到達するまで噴管５若しくは回動ジョイントＫの噴管側部材３６を回動すると、該ガイド２９の終点では係止突起３５のストッパー２９ｂとなる窪みが成形されており、該ストッパー２９ｂで係止突起３５が係止されて、逆方向、つまり、抜ける方向に回動し難くして、回動ジョイントＫの噴管側部材３６と噴管５が連結される仕組みとなっている。噴管側部材３６に設けられた係止突起３５は、図７に示す如く、中央が凹状で、該係止突起３５の先にはストッパー２９ｂに引っかかるための爪３５ａが成形されている。従って、爪３５ａが噴管５の嵌合部５ａのガイド２９終点に設けられたストッパー２９ｂに引っかかることで、散布作業時に噴管５が抜け落ちることの無いよう回動ジョイントＫの噴管側部材３６と噴管５が強固に連結される。
【００２２】
上述の噴管５及び回動ジョイントＫの噴管側部材３６にテーパ部５ｂ・３６ｂを設けた連結部の構造は、本発明に特有のものである。ブロー成形による形作られる回動ジョイント及び噴管には、ブロー成形に特有の成形時に型の合わせ目に凹部が形成されてしまうが、図８に示す従来の散布機と噴管の連結構造においては、回動ジョイント５０と噴管嵌合部５１にかけて急激に内径が絞られるので、差圧が発生し、前記凹部に隙間ができて薬剤が吹き出したり、また、内壁の段差で薬剤が吹き返されてしまったりすることがあった。これに対し、本発明に係る連結構造においては、前述の如く、回動ジョイントＫの噴管側部材３６が噴管５の嵌合部５ａよりテーパ部５ｂに渡る内輪を覆うことで、回動ジョイントＫと噴管５の連結部において、テーパ部Ｎが二重になって補強されるだけでなく、該テーパ部Ｎを設けたことで、くびれた部分はベンチュリー効果により薬剤の流速が速まり、ベルヌーイの定理により回動部Ｍと比べてテーパ部Ｎの圧力が減るので、隙間が生じていてもその部分から外気が吸い込まれることになる。従って、回動ジョイントＫと噴管５との隙間から薬剤が漏出することを防止できるのである。
【００２３】
また、従来の回動ジョイント５０では、該回動ジョイント５０の回動部５６よりも噴管５１側に、噴管５１と回動ジョイント５０を係止する係止突起５２・５２を設けた嵌合部５３を成形していた。これに対し、本発明に係る実施例では、回動ジョイントＫの回動部Ｍに噴管５の嵌合部５ａを嵌め込む仕組みとなっている。従って、回動ジョイントＫと噴管５の連結部の長さは従来に比べて短縮され、更に回動ジョイントＫと噴管５連結するための係止突起３５に爪３５ａを設けたことで抜け落ちの心配が無いので、より良好な操縦環境をもたらし、薬剤散布作業中のオペレータにかかる負担が減少する。
【００２４】
【発明の効果】
本発明は、以上のように構成したので、以下に示すような効果を奏する。
請求項１に示す如く、粒剤や粉剤等の薬剤を散布するために動力散布機の噴出口に、蛇管（３１）を接続し、該蛇管（３１）に回動自在な回動ジョイント（Ｋ）を介して噴管（５）を接続する、散布機における噴管（５）の連結構造において、前記回動ジョイント（Ｋ）は、該蛇管（３１）側に取り付けた蛇管側部材（３９）、及び噴管（５）側に取り付けた噴管側部材（３６）から構成し、該蛇管側部材（３９）を内に、該噴管側部材（３６）を外に同心的に嵌合し、当接面で摺動しながら回動可能に構成し、該噴管側部材（３６）には、前記噴管（５）の嵌合部（５ａ）に嵌合する中空状の回動部（３６ａ）と、該噴管（５）に設けたテーパ部（５ｂ）の内輪に沿う、該回動部（３６ａ）の端部から徐々に絞って直径を小さくした円錐台状のテーパ部（３６ｂ）を形成し、該噴管側部材（３６）は該蛇管側部材（３９）の外輪、及び噴管（５）の内輪に嵌合し、該噴管側部材（３６）の回動部（３６ａ）の外周には、該噴管（５）を係止する為に２つの係止突起（３５・３５）を、所定間隔をあけて成形加工し、該２つの係止突起（３５・３５）は断面視凹状に構成し中央が凹状で、先端には爪（３５ａ）を成形し、前記噴管（５）の嵌合部（５ａ）には、前記２つの係止突起（３５・３５）を挿入し、係止する２本のガイド（２９・２９）を成形し、該２本のガイド（２９・２９）はＬ字型で、該係止突起（３５）の位置を合わせて挿入するガイド入り口（２９ａ）を設け、該ガイド（２９）のＬ字の終点の位置に、前記係止突起（３５）の爪（３５ａ）が嵌入しストッパー（２９ｂ）となる窪みを成形したので、管径が急激に減少してそのテーパ部の端部は負圧となって、隙間が生じていても外気が吸い込まれて、ジョイントと噴管との隙間から薬剤が漏出したりすることを防止できるのである。
【００２５】
また、前記散布機と噴管の連結部において、回動自在なジョイントと噴管を連結するための突起に爪を設けたので、ジョイントと噴管の抜け落ちを防止し強固に固定できるため、回動自在なジョイントが激しく回動しても噴管の抜け落ちを心配せずに散布作業を行うことができるのである。
【００２６】
また、前記散布機と噴管の連結部において、回動自在なジョイントと噴管を連結するための突起を該回動自在なジョイントの回動部に設けたので、該ジョイントの長さを短縮することができた。従って、修理や掃除等のメンテナンスが行い易くなり、また、材料コストを削減し、更に、噴管の操縦をより良好に行うことができるようになったのである。
【図面の簡単な説明】
【図１】本発明の実施例に係る背負式動力散布機の全体的な構成を示した正面図である。
【図２】同じく散布機と噴管の連結部における断面図である。
【図３】本発明に係る散布機と噴管の連結構造を採用した回動ジョイントを示す図である。
【図４】同じく回動ジョイントの蛇管側部材を示す図である。
【図５】同じく回動ジョイントの噴管側部材を示す図である。
【図６】同じく噴管における回動ジョイントとの連結部を示す図である。
【図７】同じく回動ジョイントと噴管を連結する突起の断面図である。
【図８】従来の散布機と噴管の連結構造を採用した蛇管と噴管の連結部を示す図である。
【符号の説明】
Ｋ回動ジョイント
Ｍ回動部
Ｎテーパ部
５噴管
２０散布機
３１蛇管
３５係止突起
３５ａ爪[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a spreader such as a back-loading type or a stationary type power spreader, and more particularly to a connecting structure of a spreader and a jet tube connected to the spreader.
[0002]
[Prior art]
Conventionally, spraying granular fertilizers, medicines, and the like with a backpack type power spreader has been performed. Usually, the spreader can spray fertilizers and liquids such as powders and granules, and a shutter device is interposed between the drug tank and the blower case, and the amount of drug to be dropped into the blower case. The shutter device can be adjusted, and the shutter, the jet tube, and the like are exchanged according to the medicine, fertilizer, and the like. And the jet tube connected with a spreader is also selected according to the magnitude | size of the chemical | medical agent to spread, and the range to spread, and a granule is spread | dispersed uniformly. Accordingly, in such a spreader, a flexible pipe (bellows-shaped pipe) is connected to the spout of the bend pipe penetrating the end of the blower case of the spreader, and the flexible pipe is rotated. An appropriate tube for work was detachably connected through a flexible joint.
[0003]
[Problems to be solved by the invention]
However, in the structure of the connecting portion between the spreader and the jet tube in the conventional spreader described above, the inner diameter is suddenly reduced at the connecting portion between the rotatable joint and the jet tube, and the pressure in this portion increases. The drug may have leaked. In particular, when the blower case was molded by blow molding, the joint portion of the mold did not become a perfect circle, and a gap was formed in this portion, so that the drug easily leaked.
[0004]
[Means for Solving the Problems]
The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.
[0005]
In Claim 1, in order to disperse | distribute chemical | medical agents, such as a granule and a powder agent, a snake pipe (31) is connected to the spout of a power spreader, and the rotation joint (K) which can be freely rotated to this snake pipe (31) In the connecting structure of the spray pipe (5) in the spreader , which connects the jet pipe (5) via the rotary joint (K), the rotary joint (K) is a flexible pipe side member (39) attached to the flexible pipe (31) side, And a tube-side member (36) attached to the tube (5) side, and the tube-side member (39) is fitted inside and the tube-side member (36) is concentrically fitted outside, The tube-side member (36) is configured to be rotatable while sliding on the contact surface, and the tube-side member (36) has a hollow rotation portion (fitted to the fitting portion (5a) of the tube (5)). 36a) and a truncated cone that is gradually narrowed from the end of the rotating portion (36a) along the inner ring of the tapered portion (5b) provided on the jet tube (5) to reduce the diameter The tube side member (36) is fitted to the outer ring of the serpentine side member (39) and the inner ring of the tube (5), and the tube side member (36). On the outer periphery of the rotating part (36a), two locking projections (35, 35) are formed at predetermined intervals in order to lock the jet tube (5). The projections (35, 35) are formed in a concave shape in sectional view, the center is concave, a claw (35a) is formed at the tip, and the two engaging portions (5a) of the jet tube (5) The protrusions (35, 35) are inserted, and two guides (29, 29) to be locked are formed. The two guides (29, 29) are L-shaped, and the locking protrusions (35) A guide entrance (29a) is provided to be inserted in alignment, and the claw (35a) of the locking projection (35) is inserted into the position of the L-shaped end point of the guide (29) to stop the stopper. It is obtained by forming pits as 29 b).
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described.
[0007]
FIG. 1 is a front view showing an overall configuration of a backpack type power spreader according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a joint portion between the spreader and a jet tube. FIG. 3 is a view showing a rotating joint adopting a connection structure of a spreader and a jet tube according to the present invention, FIG. 4 is a view showing a serpentine side member of the turning joint shown in FIG. 3, and FIG. It is a figure which similarly shows the tube side member of a rotation joint. FIG. 6 is a view showing a connecting portion of the jet tube with the rotating joint, and FIG. 7 is a cross-sectional view of a protrusion connecting the rotating joint and the jet tube. FIG. 8 is a view showing a connecting portion between a serpentine tube and an injection tube adopting a connection structure between a conventional spreader and an injection tube.
[0008]
First, the overall configuration of the spreader according to the present invention will be described. The spreader 20 shown in FIG. 1 is configured, for example, as a backpack type power spreader, and a drug tank 11 is arranged in the upper part and a blower case 12 is arranged in the lower part. The medicine tank 11 and the blower case 12 are integrally formed by blow molding a resin.
[0009]
An engine 13 is disposed in the blower case 12, and a blower fan (not shown) is disposed in the blower case 12. The blower fan is fixed to the output shaft of the engine 13, and is configured to rotate integrally with the output shaft to blow air. The medicine tank 11, the blower case 12, the engine 13, and the like are placed on a back frame 3 formed in a substantially “L” shape in a side view. The engine 13 is provided with a fuel tank 7 and an air cleaner 8. Since the fuel tank 7 is disposed below the engine 13, a pulse pump 9 is provided above the fuel tank 7 in order to forcibly send fuel to the upper engine 13.
[0010]
A shutter storage unit 14 is interposed between the medicine tank 11 and the blower case 12. A rotary shutter device 47 and a damper shutter device 46 are stored in the shutter storage unit 14. A jet pipe 5 is connected to a jet outlet of a bend pipe 30 provided on one side. A lever guide 4 is provided on the other side of the blower case 12, and the accelerator lever 10 is rotatably attached to the lever guide 4, and the medicine metering lever 49 is rotated to the rear of the lever guide 4. Protrusively protruding.
[0011]
By rotating the metering lever 49, the metering rod 48 connected to the metering lever 49 moves up and down, thereby changing the opening degree of the rotary shutter device 47 or the damper shutter device 46, and The amount of application can be adjusted. Further, the rotational speed of the engine 13 can be changed by rotating the accelerator lever 10, and the amount of air blown by the blower fan joint in the blower case 12 driven by the engine 13 can be adjusted.
[0012]
In the blower case 12, a medicine guide tube 27 is disposed from below the rotary shutter device 47 and the damper shutter device 46 to the vicinity of the outlet of the bend pipe 30. In the medicine guide guide cylinder 27, the medicine dropped from the medicine tank 11 passes through the shutter devices 46 and 47, guides the medicine that has entered the blower case 12 to the outlet of the bend pipe 30, and the bend pipe The medicine is sprayed from the jet tube 5 connected to the 30 through the serpentine tube 31 and the rotatable joint K.
[0013]
While carrying the spreader 20 configured in this manner in the field, the air blower in the blower case 12 is driven by driving the engine 13, and the rotational speed of the engine is changed by rotating the accelerator lever 10 to adjust the air flow. In addition, by rotating the metering lever 49, the opening of the rotary shutter device 47 or the damper shutter device 46 is changed to adjust the amount of the medicine to be sprayed, and the medicine is sprayed through the jet tube 5. It is.
[0014]
Here, it demonstrates in full detail regarding the structure of the coupling | bond part of the spreader 20 and the injection tube 5 which concern on this invention. The jet tube 5 shown in FIG. 1 is connected to a pipe having a discharge hole, and a medicine is sprayed from the jet port. The spreader 20 is adapted to a wide variety of medicines and spraying methods by exchanging the differently shaped nozzles 5 according to the purpose. Therefore, the present embodiment uses a pipe-like tube having the shape shown in FIG. 1 as an example of the injection tube 5, and does not limit the shape of the connection tube 5.
[0015]
As shown in FIGS. 1 and 2, a flexible pipe connected to a spout of the bend pipe 30 at the tip of the blower case 12 in the spreader 20 is tightened by a wire clamp 32 to prevent it from coming off. The movement of the injection tube 5 is made free by connecting the injection tube 5 via the serpentine tube 31.
[0016]
A jet tube 5 is connected to the serpentine tube 31 via a rotatable rotary joint K shown in FIG. 3 so that the jet tube 5 is rotatable. The rotary joint K is composed of a serpentine tube side member 39 and a jet tube side member 36 attached to the serpentine tube 31 side and the jet tube 5 side, respectively, and when these members 36 and 39 are fitted concentrically, the member 36. It rotates while sliding on the contact surface of 39.
[0017]
First, with reference to FIGS. 2 to 4, the flexible tube side member 39 that is included in the flexible tube K and is fitted to the flexible tube 31 will be described. The serpentine side member 39 has a shape in which a plurality of various annular protrusions are provided on an annular pipe. The serpentine pipe side member is formed by fitting the serpentine pipe 31 connected to the bend pipe 30 of the spreader 20 to the annular protrusions 39a, 39a,. 39 and the serpentine tube 31 are connected. In addition, supporting and locking annular protrusions 39d, 39d, and 39c are provided in the fitting portion of the tube-side member 36 that is the rotating portion M of the rotating joint K. The locking protrusions 39c are formed between the supporting protrusions 39d, 39d,... So as to protrude more outward than the supporting protrusions 39d. Even when the retaining recess 38 prevents the retaining projection 38 from coming off, the supporting projection 39d is in contact with the inner ring of the tube-side member 36 so as to rotate and slide.
[0018]
On the other hand, as shown in FIGS. 2, 3, and 5, the tube-side member 36 that constitutes the rotation joint K and is fitted to the tube 5 includes a rotation part 36 a and a rotation part. A tapered portion 36b having a truncated cone shape is formed by gradually reducing the diameter from the end of 36a. The rotating portion 36a has an annular protrusion 38 that forms a recess for locking the serpentine tube side member 39 inside, and a locking protrusion 35 that is configured in a concave shape in sectional view and locks the jet tube 5.・ 35 is formed on the outer periphery at a predetermined interval. Further, the tube side member 36 is provided with a taper portion 36b in conformity with the fitting ring 5a of the tube 5 and the inner ring of the taper portion 5b. From the rotation part M of the connecting part 5 to the taper part N, the outer ring of the serpentine tube side member 39 of the rotation joint K and the inner ring of the injection pipe 5 are fitted.
[0019]
When the tube side member 36 is inserted concentrically into the above-described bellows side member 39 until it comes into contact with the protrusion 39b provided on the tube side member 39, the locking projection 39c provided on the tube side member 39 is The two members 36 and 39 are connected to each other by a locking recess 38 of the side member 36 to constitute a rotary joint K. And in the rotation part M of the rotation joint K, the support projections 39d, 39d,... Of the serpentine tube side member 39 are in contact with the inner ring of the tube side member 36, and the support projections of the tube side member 36. The respective members 36 and 39 rotate while sliding inside. Accordingly, the spreader 20 and the jet tube 5 are rotated via the rotatable joint K and the serpentine tube 31 which are configured by fitting the two members of the serpentine side member 39 and the jet tube side member 36. By freely connecting, the operation of the injection tube 5 at the time of spraying becomes very good.
[0020]
The jet tube 5 is configured to be connected through a plurality of pipes to adjust the length according to the field and the type of medicine, and the pipe located closest to the sprayer of the jet tube 5 is shown in FIG. As shown in FIG. 6, a handle 34 for supporting and operating the jet tube 5 is provided, and a fitting portion 5 a for connecting the spreader 20 and the jet tube 5 via the serpentine tube 31 and the rotating joint K. Is molded. A taper portion 5b extends from the fitting portion 5a to the vicinity of the base of the handle 34, and is blow-molded so that the diameter gradually increases from the main pipe of the injection tube 5 to the fitting portion 5a.
[0021]
Further, the locking projections 35 and 35 of the tube-side member 36 are inserted into the fitting portion 5a of the jet tube 5, and the guides 29 and 29 for locking them are positioned at the locking projections 35 and 35. Molded together. The guide 29 is L-shaped, and when the locking projection 35 of the jet tube side member 36 is inserted from the guide inlet 29a and the locking projection 35 reaches the corner of the L-shape, the locking projection 35 is then moved to the guide 29. When the tube 5 or the tube-side member 36 of the rotation joint K is rotated until the end of the guide 29 is reached, a recess that forms the stopper 29b of the locking projection 35 is formed at the end of the guide 29, and the stopper 29b. Thus, the locking projection 35 is locked to make it difficult to rotate in the reverse direction, that is, in the direction in which the locking projection 35 is pulled out, so that the injection tube side member 36 of the rotation joint K and the injection tube 5 are connected. As shown in FIG. 7, the locking projection 35 provided on the tube-side member 36 has a concave center, and a claw 35a is formed at the tip of the locking projection 35 to be caught by the stopper 29b. Therefore, the claw 35a is caught by the stopper 29b provided at the end of the guide 29 of the fitting portion 5a of the injection tube 5, so that the injection tube side member 36 of the rotary joint K does not fall out during the spraying operation. And the tube 5 are firmly connected.
[0022]
The structure of the connecting portion provided with the tapered portions 5b and 36b in the above-described tube 5 and the tube-side member 36 of the rotary joint K is unique to the present invention. In the rotary joint and the injection tube formed by blow molding, a recess is formed at the joint of the mold at the time of molding peculiar to blow molding. In the conventional connecting structure of the sprayer and injection tube shown in FIG. Since the inner diameter is rapidly reduced between the rotating joint 50 and the tube fitting portion 51, a differential pressure is generated, a gap is formed in the recess, and the medicine is blown out, or the medicine is blown back at the step on the inner wall. There were times when I missed. On the other hand, in the connection structure according to the present invention, as described above, the injection tube side member 36 of the rotation joint K covers the inner ring extending from the fitting portion 5a of the injection tube 5 to the tapered portion 5b, thereby rotating. The joint portion between the joint K and the injection tube 5 is not only reinforced with the taper portion N being doubled, but by providing the taper portion N, the constricted portion increases the flow rate of the drug due to the venturi effect. Since the pressure of the taper portion N is reduced as compared with the rotating portion M according to Bernoulli's theorem, even if a gap is generated, outside air is sucked from that portion. Therefore, it is possible to prevent the medicine from leaking from the gap between the rotating joint K and the jet tube 5.
[0023]
Further, in the conventional rotary joint 50, fitting protrusions 52 and 52 for locking the jet tube 51 and the rotary joint 50 are provided closer to the jet pipe 51 than the rotary portion 56 of the rotary joint 50. The joint portion 53 was molded. In contrast, in the embodiment according to the present invention, the fitting portion 5a of the injection tube 5 is fitted into the turning portion M of the turning joint K. Accordingly, the length of the connecting portion between the rotating joint K and the jet tube 5 is shortened as compared with the conventional one, and the locking protrusion 35 for connecting the rotating joint K and the jet tube 5 is provided with a claw 35a so that the connecting portion is dropped. Therefore, a better operating environment is provided, and the burden on the operator during the medicine spraying operation is reduced.
[0024]
【The invention's effect】
Since the present invention is configured as described above, the following effects can be obtained.
As shown in claim 1, a spiral joint (31) is connected to the spout of the power spreader for spraying drugs such as granules and powders, and a rotatable joint (K ), The rotating joint (K) is connected to the side of the serpentine tube (31), and is connected to the serpentine tube side member (39). And the tube side member (36) attached to the tube (5) side, and the tube side member (39) is fitted concentrically and the tube side member (36) is fitted concentrically outside. The tube-side member (36) is configured to be rotatable while sliding on the abutment surface, and the tube-side member (36) is fitted to the fitting portion (5a) of the tube (5). (36a) and a truncated cone along the inner ring of the tapered portion (5b) provided on the jet tube (5) and gradually reduced from the end of the rotating portion (36a) to reduce the diameter The tube side member (36) is fitted to the outer ring of the serpentine side member (39) and the inner ring of the tube (5), and the tube side member (36). On the outer periphery of the rotating part (36a), two locking projections (35, 35) are formed at predetermined intervals in order to lock the jet tube (5). The projections (35, 35) are formed in a concave shape in sectional view, the center is concave, a claw (35a) is formed at the tip, and the two engaging portions (5a) of the jet tube (5) The protrusions (35, 35) are inserted, and two guides (29, 29) to be locked are formed. The two guides (29, 29) are L-shaped, and the locking protrusions (35) A guide entrance (29a) is provided to be inserted in alignment, and the claw (35a) of the locking projection (35) is inserted into the position of the L-shaped end point of the guide (29) to stop the stopper. Having formed pits as 29 b), end of the tapered portion pipe diameter decreases sharply is a negative pressure, even if a gap is sucked outside air, the gap between the joint and噴管It is possible to prevent the medicine from leaking out.
[0025]
In addition, since a claw is provided on the projection for connecting the rotatable joint and the jet tube at the connecting portion between the spreader and the jet tube, the joint and the jet tube can be prevented from falling off and firmly fixed. Even if the movable joint pivots violently, the spraying operation can be performed without worrying about the dropout of the jet tube.
[0026]
Further, in the connecting portion between the sprayer and the jet tube, a projection for connecting the rotatable joint and the jet tube is provided in the rotating portion of the rotatable joint, so that the length of the joint is shortened. We were able to. Therefore, maintenance such as repair and cleaning can be easily performed, the material cost can be reduced, and the operation of the jet tube can be performed more favorably.
[Brief description of the drawings]
FIG. 1 is a front view showing an overall configuration of a backpack type power spreader according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of the connecting portion between the spreader and the injection tube.
FIG. 3 is a view showing a rotating joint adopting a connection structure of a spreader and a jet tube according to the present invention.
FIG. 4 is a view similarly showing a serpentine tube side member of a rotary joint.
FIG. 5 is a view similarly showing a tube side member of a rotating joint.
FIG. 6 is a view showing a connecting portion with a rotating joint in the same jet tube.
FIG. 7 is a cross-sectional view of a protrusion that similarly connects the rotating joint and the injection tube.
FIG. 8 is a view showing a connecting portion between a serpentine tube and an injection tube adopting a connection structure between a conventional spreader and an injection tube.
[Explanation of symbols]
K rotation joint M rotation part N taper part 5 jet pipe 20 spreader 31 snake pipe 35 locking projection 35a claw

Claims

In order to spray chemicals such as granules and powders, a serpentine tube (31) is connected to the spout of the power spreader, and the spout tube (31) is connected to the serpentine tube (31) via a rotatable joint (K). 5) In the connecting structure of the spray pipe (5) in the spreader, the rotary joint (K) includes the spiral pipe side member (39) attached to the flexible pipe (31) side, and the jet pipe (5). It consists of a tube side member (36) attached to the side, and the tube side member (39) is fitted inside, the tube side member (36) is fitted concentrically, and slides on the contact surface. The tube-side member (36) is configured to be rotatable, and the tube-side member (36) includes a hollow rotation portion (36a) fitted to the fitting portion (5a) of the tube (5), and the jet tube. A truncated cone-shaped tapered portion (36b) that is gradually narrowed from the end of the rotating portion (36a) along the inner ring of the tapered portion (5b) provided on the pipe (5) to reduce the diameter. The tube side member (36) is fitted to the outer ring of the serpentine side member (39) and the inner ring of the tube (5), and the rotating part (36a) of the tube side member (36) is formed. ), Two locking projections (35, 35) are formed at predetermined intervals in order to lock the jet tube (5). The two locking projections (35, 35) Is formed in a concave shape in cross section and has a concave shape in the center, and a claw (35a) is formed at the tip, and the two engaging projections (35, 35) are formed on the fitting portion (5a) of the jet tube (5). The two guides (29, 29) to be locked are molded, and the two guides (29, 29) are L-shaped, and the locking protrusions (35) are aligned and inserted. A guide entrance (29a) is provided, and the nail (35a) of the locking projection (35) is inserted into the position of the L-shaped end point of the guide (29) to become a stopper (29b).噴管coupling structure in spreaders, characterized in that molded.