JP3785751B2

JP3785751B2 - Ten-row planting rice transplanter

Info

Publication number: JP3785751B2
Application number: JP17831997A
Authority: JP
Inventors: 石田　　伊佐男; 士郎浅野; 善宏福村
Original assignee: Iseki and Co Ltd
Current assignee: Iseki and Co Ltd
Priority date: 1997-07-03
Filing date: 1997-07-03
Publication date: 2006-06-14
Anticipated expiration: 2017-07-03
Also published as: JPH1118529A

Description

【０００１】
【発明の属する技術分野】
この発明は、１０条植えの田植機の技術分野に属する。
【０００２】
【従来の技術】
従来、１０条植えの田植機のフロ−ト構成は、図８に示すような構成が考えられていた。即ち、左右中央側に２つ中央接地フロ−トＡ，Ａを設け、この２つの中央接地フロ−トＡ，Ａがそれぞれ中央側の植付位置Ｐ４〜Ｐ７を２箇所づつ整地する幅広部ａ，ａを各フロ−ト前部に形成していた。そして、その左右外側方に植付位置Ｐ３，Ｐ８を１箇所づつ整地する幅広部ｂ，ｂを各フロ−ト前部に形成した左右接地フロ−トＢ，Ｂを２つ設け、更に、その左右外側方に植付位置Ｐ１・Ｐ２，Ｐ９・Ｐ１０を２箇所づつ整地する幅広部ｃ，ｃを各フロ−ト前部に形成した左右接地フロ−トＣ，Ｃを２つ設けて、合計６つ接地フロ−トを設けた構成としていた。尚、図８中、ＦＷは走行車体の前輪、ＲＷは走行車体の後輪を示す。
【０００３】
そして、苗植装置の昇降制御装置における苗植装置の表土面に対する上下方向の位置変化の検出を、苗植装置の左右の傾きの影響の少ない箇所で行なうため、その検出を左右中央側の接地フロ−トに兼ねるよう設ける。また、１０条植えの苗植装置は、その重量が植付条数の少ないものと比べて重いので、水田表土面に接地させた場合の接地フロ−トの接地荷重は大きくなり、そのため、昇降制御装置の表土面位置検出体を兼ねる接地フロ−トが、表土面の上下位置変化に追従して上下に動作するのに必要な荷重も大きくなる。このことから、上記従来の構成のものでは、昇降制御装置の表土面位置検出体を兼ねる中央接地フロ−トを、連結体ｄで連結した２つの中央接地フロ−トＡ，Ａとすることで、２つ分のフロ−トの接地面積を確保して、良好に表土面の上下位置変化に追従して上下に動作できるようにしている。
【０００４】
【発明が解決しようとする課題】
上記従来のフロ−ト構成のものは、２つの中央接地フロ−トＡ，Ａで表土面の上下位置変化に追従して上下に動作できるようにしているから、苗植装置の表土面に対する上下方向の位置変化を良好に検出できるものとなるが、接地フロ−トの個数が多く、また、それにより左右側の接地フロ−トの左右間隔が狭くなってその接地フロ−ト間の泥水の後方への流れが良好でなく、その結果、左右外側方への泥押しが多くなって前行程で植付けた苗の姿勢を乱してしまう課題がある。
【０００５】
【課題を解決するための手段】
この発明は、上記課題を解決するために、左右一対の前輪（８）及び後輪（１０）を備える走行車体（２）の後側に昇降リンク装置（３）を介して昇降動可能に１０条植えの苗植装置（４）を装着し、該苗植装置（４）の表土面に対する上下方向の位置を設定高さに維持するよう苗植装置（４）を昇降する昇降制御装置を設けた田植機において、１０箇所の植付位置（Ｐ１〜Ｐ１０）を２箇所づつ整地する５つの接地フロ−ト（２５，２６・２６，２７・２７）を左右に間隔をあけて配置し、該接地フロ−ト（２５，２６・２６，２７・２７）の左右中央側に位置する中央接地フロ−ト（２５）を前記昇降制御装置における苗植装置（４）の表土面に対する上下方向の位置変化を検出するための検出体を兼ねるものとし、且つ、該中央接地フロ−ト（２５）の幅広部（２５ａ）の底部の左右方向における接地幅を苗植付条間の幅（Ｗ）に対して略々２倍或いは２倍から２．５倍の幅に設定し、前記後輪（１０）の機体左右方向内側に補助車輪（１０ｃ）を取り付けるとき、該補助車輪（１０ｃ）に干渉する前記中央接地フロ−ト（２５）の幅広部（２５ａ）の左右端部分（２５ａ’）を取り外しできるように分割構成したことを特徴とする１０条植え田植機としたものである。
【０００６】
【作用】
この発明の１０条植え田植機１は、水田内で苗を植付けながら走行すると、５つの接地フロ−ト２５，２６・２６，２７・２７が１０箇所の植付位置Ｐ１〜Ｐ１０をそれぞれ２箇所づつ整地し、且つ、左右接地フロ−ト２６・２６，２７・２７の間で泥水を後方へ良好に流しながら表土面を滑走していく。また、中央接地フロ−ト２５は、その幅広部２５ａの底部の左右方向における接地幅が苗植付条間の幅Ｗに対して略々２倍或いは２倍から２．５倍の幅に設定されて、中央接地フロ−ト２５が表土面の上下方向の位置変化に対して良好に追従して検出動作し、よって、苗植装置４の表土面に対する上下方向の位置変化を良好に検出するものとなる。その結果、苗の植付深さが高精度に制御され、且つ、良好な整地性となるよう、苗植装置４が昇降制御される。また、旋回時に旋回半径が大きくなるのを回避するために後輪１０の機体左右方向内側に補助車輪１０ｃを取り付けるときには、前記中央接地フロ−ト２５の幅広部２５ａの左右端部分２５ａ’を取り外して対応できる。
【０００７】
【発明の効果】
この１０条植え田植機１においては、１０箇所の植付位置Ｐ１〜Ｐ１０を２箇所づつ整地する５つの接地フロ−ト２５，２６・２６，２７・２７を左右に間隔をあけて配置した構成としているので、従来より接地フロ−トの個数が少なくて簡易な構成となり、しかも、左右接地フロ−ト２６・２６，２７・２７間の後方への泥水の流れも良好で左右外側方への泥押しも少なく前行程で植付けた苗の姿勢の乱れも少ないものとなる。更に、左右中央側に位置する中央接地フロ−ト２５を昇降制御装置における苗植装置４の表土面に対する上下方向の位置変化を検出するための検出体を兼ねるものとし、且つ、該中央接地フロ−ト２５の幅広部２５ａの底部の左右方向における接地幅を苗植付条間の幅Ｗに対して略々２倍或いは２倍から２．５倍の幅に設定しているので、中央接地フロ−ト２５が表土面の上下方向の位置変化に対して良好に追従して検出動作するものとなり、その結果、苗の植付深さが高精度に制御され、且つ、整地性も良好なものとなる。また、後輪１０の機体左右方向内側に補助車輪１０ｃを取り付けるときには、前記中央接地フロ−ト２５の幅広部２５ａの左右端部分２５ａ’を取り外して対応できる。
【０００８】
【発明の実施の形態】
以下、本発明の実施の一形態としての１０条植え田植機１について説明する。
１０条植え田植機１は、乗用型田植機で、走行車体２の後側に昇降リンク装置３を介して昇降動可能に且つロ−リング動可能に１０条植えの苗植装置４を装着した構成となっている。また、走行車体２の後部には、施肥装置５の肥料タンク５０と肥料繰出装置５１を装着している。なお、この施肥装置５は、肥料タンク５０の肥料が肥料繰出装置５１で繰出され、その繰出された肥料がブロア５２からの風を受けて移送ホ−ス５３内を通って各接地フロ−トに設けた施肥ガイド５４から排出されるようになって土壌に施肥する構成としたものである。
【０００９】
走行車体１は、機体フレ−ム６上に設置したエンジンＥと、機体フレ−ム６の前端に固着したミッションケ−ス７と、該ミッションケ−ス７の左右両側に前輪伝動フレ−ムを介して設けた前輪８・８と、機体フレ−ム６の後端にロ−リング自在に装着した後輪フレ−ムの左右両側に後輪伝動ケ−ス９・９を介して設けた後輪１０・１０を備えている。エンジンＥの出力軸の回転はベルト伝動装置を介してミッションケ−ス７の入力軸に伝動し、ミッションケ−ス７内に入力された動力はミッションケ−ス７内のギヤ伝動機構や伝動軸を介して前輪８・８、後輪１０・１０、そして、苗植装置４、施肥装置５に伝達されるようになっている。また、この走行車体１上に、ステップ１１を装着し、また、エンジンＥの上側を覆うカバ−１２を設け、そのカバ−１２上に操縦席１３を設置している。その操縦席１３の前方には、前輪８・８を上下方向の軸回りに回動操作するハンドル１４を設けている。
【００１０】
昇降リンク装置３は、一本のアッパ−リンク１５と２本のロワ−リンク１６・１６との各前端部を、機体フレ−ム６の後端部に固着した上下方向に延びるリンク支持フレ−ム１７に回動自在に取り付け、各後端部を連結リンク１８に回動自在に連結したリンク構成であり、連結リンク１８の下部に、苗植装置４の伝動ケ−ス１９の前部に前方に突出して固着された連結軸２０を回動自在に連結して、昇降リンク装置３に苗植装置４をロ−リング自在に連結する構成となっている。また、アッパ−リンク１５の走行車体２側には下方に延びるア−ム２１を固着していて、該ア−ム２１の下端部に、機体フレ−ム６に左右軸芯回りに回動自在にシリンダ部が取り付けられた昇降用油圧シリンダ２２のピストン先端部がスプリングケ−ス２３内のスプリングＳを介して連結し、昇降用油圧シリンダ２２が伸縮作動すると、昇降リンク装置３が昇降動し、苗植装置４が昇降する構成となっている。
【００１１】
なお、苗植装置４の昇降制御装置は、図２のブロック図に示すような構成の制御装置により作動するものとしている。具体的には、制御装置Ｃに、昇降制御にかかる制御入力系の信号に応じて昇降制御にかかる制御出力系に信号を出力する昇降制御プログラムＣＰ１をソフトウエアとして備える。そして、その制御装置Ｃに接続する制御入力系には、操縦席１３の右側に設けた第１切換レバ−Ｌ１の操作位置を検出するポテンショメ−タＰＭ１と、ハンドル１４近傍に設けた第２切換レバ−Ｌ２の操作によりオン・オフ切り替わるスイッチＳＷ１，ＳＷ２と、苗植装置４の底部側に設けた接地フロ−ト２５，２６・２６，２７・２７のうち左右中央に設置される中央接地フロ−ト２５の前部の上下位置を検出するポテンショメ−タＰＭ２と、前記ポテンショメ−タＰＭ２による中央接地フロ−ト２５の位置検出に基づく昇降制御における感度調節を行なう感度調節ダイヤル２８の操作位置に応じた信号を出力するボリュ−ム等からなる感度設定器２９と、昇降リンク装置３のロア−リンクの角度を検出するポテンショメ−タＰＭ３とを設けている。また、これに対応して制御装置Ｃに接続する制御出力系には、苗植装置４が上昇作動する側に昇降用油圧バルブ２４を切換操作する上昇用ソレノイドＳＯＬ１と、苗植装置４が下降作動する側に昇降用油圧バルブ２４を切換操作する下降用ソレノイドＳＯＬ２とを設けている。なお、感度調節ダイヤル２８が操作されて、感度設定器２９が調節されると、中央接地フロ−ト２５の前部の制御目標となる基準位置Ｈが上下に変更調節される。中央接地フロ−ト２５の前部の基準位置Ｈが高く設定されると中央接地フロ−ト２５の底面が表土面に対して前後方向に迎う角度が小さくなって、中央接地フロ−ト２５の表土面の上下位置変化に対する追従性が鈍感となり、昇降制御の感度が鈍感に調節される。逆に、中央接地フロ−ト２５の前部の基準位置Ｈが低く設定されると中央接地フロ−ト２５の底面が表土面に対して前後方向に迎う角度が大きくなって、中央接地フロ−ト２５の表土面の上下位置変化に対する追従性が敏感となり、昇降制御の感度が敏感に調節される。
【００１２】
上記のように構成した苗植装置４の昇降制御装置は、第１切換レバ−Ｌ１の人為的な操作、或いは第２切換レバ−Ｌ２の人為的な操作に応じて苗植装置４が昇降制御され、また、接地フロ−ト２５，２６・２６，２７・２７が水田表土に接地滑走する状態で圃場を作業走行するときには、苗植装置４の表土面に対する上下方向の位置変化に追従した中央接地フロ−ト２５の前部の上下動の検出動作に基づいて、苗植装置４の表土面に対する上下方向の位置が設定位置に維持されるように苗植装置４が昇降制御される。
【００１３】
なお、アッパ−リンク１５のア−ム２１と昇降用油圧シリンダ２２との間に介在させたスプリングＳの伸縮作動により、苗植装置４が若干の範囲で昇降動するようになっている。これにより、接地フロ−ト２５，２６・２６，２７・２７が水田表土に接地滑走する状態で圃場を作業走行するときに、苗植装置４の表土面に対する上下方向の位置変化による接地フロ−ト２５，２６・２６，２７・２７の接地圧変動に応じてスプリングＳが伸縮作動し、接地フロ−ト２５，２６・２６，２７・２７が所定の接地圧を維持するように苗植装置４が昇降動するものとなって、前記センサフロ−ト２５の前部の上下動に基づく苗植装置４の昇降制御装置と併せて、苗植装置４を水田表土面に対して所定の高さに維持される機構となっている。
【００１４】
苗植装置４は、苗を水田表土に植付けるロ−タリ−式の植付装置２８…を１０条分備え、それに対応して各植付装置２８…に供給する苗を載置する１０条分の苗載置部を備えた苗載せ台２９を備えている。苗載せ台２９は前側が高く後側が低く前後方向に傾斜した姿勢で設置され、且つ、植付装置２８…の作動に連動して左右に往復移動するように設けている。苗載せ台２９の下側には、植付装置２８…への伝動と、苗載せ台２９の左右往復作動機構への伝動と、苗載せ台２９の各苗載置部に設けた苗送りベルト３０…の苗送り作動機構への伝動を行なう伝動機構を内装する伝動ケ−ス１９を設けている。そして、その伝動ケ−ス１９の下部にフロ−ト支持パイプ３１を回動調節操作可能に設け、該フロ−ト支持パイプ３１の各所に固着するフロ−ト支持ア−ム３２…の先端に、前記接地フロ−ト２５，２６・２６，２７・２７を、植付位置の前後方向における位置Ｐと略々同じ位置に軸芯Ｘを配置し該軸芯Ｘが左右方向に向かうように配した軸３３回りに回動自在に取り付けている。この接地フロ−ト２５，２６・２６，２７・２７は、１０条植の苗植装置４に対して左右中央位置に１つ、その左右両側方に２つづつで、合計５つ設置したものとなっている。なお、図３〜図８において、植付位置の前後方向における位置Ｐに沿って各接地フロ−ト上に記した一点鎖線が上記軸３３の軸芯Ｘ位置を示し、且つ、その位置で軸３３回りに回動可能に接地フロ−トが支持していることを示す。
【００１５】
上記接地フロ−ト２５，２６・２６，２７・２７は、機体側面視でソリ状の形態に形成され、また、機体平面視で前部側が後部側に対して幅広で後部側が前部側に対して幅狭に形成され、後部側の幅狭部２５ｂ，２６ｂ，２６ｂ，２７ｂ，２７ｂの前側左右両側方に苗植付位置Ｐ１〜Ｐ１０が設定され、その左右の苗植付位置の表土面を前部側の幅広部２５ａ，２６ａ，２６ａ，２７ａ，２７ａが整地するようになっている。従って、接地フロ−ト２５，２６・２６，２７・２７は、それぞれ苗植付位置Ｐ１〜Ｐ１０を２箇所づつ整地する構成となっている。
【００１６】
そして、上記接地フロ−トのうち左右中央に設置した中央接地フロ−ト２５は、前記のとおり、昇降制御装置における苗植装置４の表土面に対する上下方向の位置変化を検出するための検出体（表土面位置検出体）を兼ねる。この中央接地フロ−ト２５は、図３に示すように、その左右両側に設置される同一形状の左右接地フロ−ト２６・２６，２７・２７と比べ異なる形状に形成され、特に、中央接地フロ−ト２５の前部の幅広部２５ａは、左右接地フロ−ト２６・２６，２７・２７の前部の幅広部２６ａ，２６ａ，２７ａ，２７ａより幅広く形成されている。なお、接地フロ−ト２５，２６・２６，２７・２７の左右幅は、その底部接地面の左右幅と略々同幅となるよう設けられている。
【００１７】
具体的に、中央接地フロ−ト２５は、その幅広部２５ａの左右両端位置が、中央接地フロ−ト２５が整地する苗植付位置Ｐ５，Ｐ６とその隣の左右接地フロ−ト２６，２６が整地する苗植付位置Ｐ４，Ｐ７との苗植付条間Ｗ２，Ｗ３の左右中央位置Ｗ２Ｃ，Ｗ３Ｃと、中央接地フロ−ト２５の隣の左右接地フロ−ト２６，２６が整地する苗植付位置Ｐ４，Ｐ７との間に位置するよう設けている。なお、中央接地フロ−ト２５の幅広部２５ａの左右両端位置が、前記左右中央位置Ｗ２Ｃ，Ｗ３Ｃに位置するように設けても良い。
【００１８】
一方、左右接地フロ−ト２６・２６，２７・２７は、その幅広部２６ａ，２６ａ，２７ａ，２７ａの左右両端位置が、その接地フロ−トが整地する苗植付位置Ｐ１，Ｐ２，Ｐ３，Ｐ４，Ｐ７，Ｐ８，Ｐ９，Ｐ１０と隣の接地フロ−トが整地する隣の苗植付位置との苗植付条間Ｗ１，Ｗ２，Ｗ３，Ｗ４の中央位置Ｗ１Ｃ，Ｗ２Ｃ，Ｗ３Ｃ，Ｗ４Ｃとの間に位置するよう設けている。
【００１９】
即ち、中央接地フロ−ト２５の幅広部２５ａの底部接地幅は、苗植付条間の幅Ｗ（各植付位置Ｐ１〜Ｐ１０の間隔で一般的に等間隔に設定され、例えば３０ｃｍに、一部地域で３３ｃｍに設定されている）に対して、略々２倍、或いは２倍〜２．５倍の幅に設定され、左右接地フロ−ト２６・２６，２７・２７の幅広部２６ａ，２６ａ，２７ａ，２７ａの底部接地幅は、苗植付条間の幅Ｗに対して略々１．５倍の幅に設定している。更に、中央接地フロ−ト２５の幅広部２５ａの底部接地幅は、左右接地フロ−ト２６・２６，２７・２７の前端位置付近から機体前方側部分２５ｃがその後方側部分２５ｄよりも更に幅広く設定し、中央接地フロ−ト２５の幅広部２５ａの底部接地面積の拡大を図っている。なお、中央接地フロ−ト２５の幅広部２５ａの前記後方側部分２５ｄは、隣の左右接地フロ−ト２６・２６の幅広部２６ａ，２６ａとの間隔が狭くなりすぎて泥水の後方への流れが悪くなりすぎないように、適宜左右幅に設定してある。
【００２０】
また、中央接地フロ−ト２５の幅広部２５ａの前後幅は、左右接地フロ−ト２６・２６，２７・２７の幅広部２６ａ，２６ａ，２７ａ，２７ａの前後幅よりも幅広く、具体的には略々２倍の前後幅に設定して、よって、中央接地フロ−ト２５の接地面前端位置が左右接地フロ−ト２６・２６，２７・２７の接地面前端位置より前方に位置し、中央接地フロ−ト２５の幅広部２５ａの前後方向の接地幅が左右接地フロ−ト２６・２６，２７・２７の幅広部２６ａ，２６ａ，２７ａ，２７ａの前後方向の接地幅より略々２倍或いはそれ以上に幅広くなるよう設けられ、この点からも中央接地フロ−ト２５の幅広部２５ａの底部接地面積の拡大を図っている。
【００２１】
なお、左右接地フロ−ト２６・２６，２７・２７は、走行車体２の車輪跡の整地も行うように配置されている。即ち、走行車体２の前輪８・８及び後輪１０・１０のトレッドは略々同じトレッドに設定され、これら前輪８・８及び後輪１０・１０の車輪跡は、内側の左右接地フロ−ト２６・２６が行うように配置されている。また、走行車体２の水田圃場内での推進力を向上させるためと圃場（耕盤）の凹凸による走行車体２の左右の傾きを少なくするために、図３に示すように、後輪（後主車輪）１０・１０の機体左右方向外側に補助車輪１０ａ，１０ａ；１０ｂ，１０ｂを設けた場合は、外側の補助車輪１０ｂ，１０ｂの車輪跡は、外側の左右接地フロ−ト２７・２７が行うように配置され、内側の補助車輪１０ａ，１０ａの車輪跡は、車輪跡用整地体（レ−キ）３４，３４（泥水の流れをできるだけ妨げないよう板体を機体平面視で櫛状の形状に形成したものが良いが、車輪跡を整地する作用があればその形状等は限定しない）が行うように配置されている。ところで、外側の補助車輪１０ｂ，１０ｂを取り付けると旋回時の旋回半径が大きくなるが、これを回避するために外側の補助車輪１０ｂ，１０ｂの代わりに後輪（後主車輪）１０・１０の機体左右方向内側に補助車輪１０ｃ，１０ｃを取り付ける場合には、中央接地フロ−ト２５の幅広部２５ａの左右端部に干渉するので、その干渉する部分２５ａ’・２５ａ’を取り外せるように予め分割構成して、補助車輪１０ｃ，１０ｃを取り付けるときに、中央接地フロ−ト２５の底部接地面積は小さくなるが、前記部分２５ａ’・２５ａ’を取り外して対応できるようにしている。
【００２２】
また、機体左右方向最外側の左右接地フロ−ト２７・２７は、苗植装置４を表土面に対して平行な姿勢に維持するようロ−リング制御するための検出体を兼ねる。この左右接地フロ−ト２７・２７の左右いずれか一方側が、その前部が設定位置以上に表土面に押し上げられて上動したことを左右のロ−リング検出器３５Ｒ・３５Ｌの一方側が検出すると、その側が表土面に対して低くなっているとして、その側が高くなるようにロ−リング駆動装置３６を駆動して苗植装置４をロ−リング動させるよう制御する。ロ−リング検出器３５Ｒ・３５Ｌの左右両方側が検出状態にあるとき、或いは、左右両方側が非検出状態にあるときは、苗植装置４は表土面に対して設定範囲内において表土面に平行な姿勢であるとし、ロ−リング駆動装置３６は駆動されない。尚、このロ−リング制御の制御プログラムＣＰ２は、前記制御装置Ｃにソフトウエアとして備えられている。
【００２３】
また、各接地フロ−ト２５，２６・２６，２７・２７の底部左右中央側には、泥水を後方に流すための溝２５ｅ，２６ｃ・２６ｃ，２７ｃ・２７ｃが形成されて、フロ−トの泥押しができるだけ少なくなるように設けられている。この溝は、図３に示されるように、前側が左右に扇状に広くなっていて、フロ−トの左右中央側に向かってくる泥水流を受けて、その後方に続く左右に狭い溝に誘導するようになっている。そして、溝の後端はフロ−ト後端まで抜けずにフロ−ト後端手前まで形成されていて、溝内を流れる泥水をフロ−ト接地面の表土へ鎮圧するようになっている。また、これによりフロ−ト後部側が上方に押上られるように作用を受けるが、これがフロ−ト前部側が泥水流れを受けて浮き上がろうとするのをおさえることにもなる。
【００２４】
以上のように構成した１０条植え田植機１は、水田圃場内に入り、苗植装置４を下降して、接地フロ−ト２５，２６・２６，２７・２７が表土面に接地する状態で苗植装置４を作動させながら走行すると、苗植装置４は各植付装置２８…が苗載せ台２９から苗を一株づつとって圃場に植付けていき、１０条分の苗を植付けながら作業走行するものとなる。
【００２５】
そして、この１０条植え田植機１においては、１０箇所の植付位置Ｐ１〜Ｐ１０を２箇所づつ整地する５つの接地フロ−ト２５，２６・２６，２７・２７を左右に間隔をあけて配置した構成としているので、従来より接地フロ−トの個数が少なくて簡易な構成となり、しかも、左右接地フロ−ト２６・２６，２７・２７間の後方への泥水の流れも良好で左右外側方への泥押しも少なく前行程で植付けた苗の姿勢の乱れも少ないものとなる。更に、左右中央側に位置する中央接地フロ−ト２５を昇降制御装置における苗植装置４の表土面に対する上下方向の位置変化を検出するための検出体を兼ねるものとし、且つ、該中央接地フロ−ト２５の幅広部２５ａの底部の左右方向における接地幅を苗植付条間の幅Ｗに対して略々２倍或いは２倍から２．５倍の幅に設定しているので、中央接地フロ−ト２５が表土面の上下方向の位置変化に対して良好に追従して検出動作するものとなり、その結果、苗の植付深さが高精度に制御され、且つ、整地性も良好なものとなる。
【００２６】
以下に、上記構成のものとは別構成のものを示す。
図４において、表土面位置検出体を兼ねる中央接地フロ−ト３７は、前記中央接地フロ−ト２５と比べると、以下の点で異なる構成を示している。即ち、幅狭部３７ｂの左右外側に位置して植付位置Ｐ４・Ｐ５の間と植付位置Ｐ６・Ｐ７の間で、植付位置より前側から後側にかけて接地する後部外側接地部３７ｃ・３７ｃが幅広部３７ａから連続して形成されている。そして、その後部外側接地部３７ｃ・３７ｃの左右内側に位置する幅狭部３７ｂの後端位置が後部外側接地部３７ｃ・３７ｃの後端位置より前方に位置するよう短く形成されている。また、この中央接地フロ−ト３７は、左右の後部外側接地部３７ｃ・３７ｃの２箇所で支持されているから、左右に幅広い該フロ−ト３７を左右にねじれにくく支持できる。また、この中央接地フロ−ト３７が整地する植付位置Ｐ５・Ｐ６は、後部外側接地部３７ｃ・３７ｃと幅狭部３７ｂに左右に囲まれているが、幅狭部３７ｂの後端位置が短く植付位置Ｐ付近に位置させ、しかも、フロ−ト底部の左右中央に形成した溝３７ｄの後端が、幅狭部３７ｂの後端まで抜けるように形成されているから、植付位置Ｐ５・Ｐ６に適度に泥水が存在するようになり、従って、植付位置における水の少なさからくる植付装置の苗の持ち帰り問題が生じにくいものとなっている。
【００２７】
図５において、表土面位置検出体を兼ねる中央接地フロ−ト３８は、前記中央接地フロ−ト２５と比べると、以下の点で異なる構成を示している。即ち、幅狭部３８ｂの左右外側に位置して植付位置Ｐ４・Ｐ５の間と植付位置Ｐ６・Ｐ７の間で、植付位置より前側から後側にかけて接地する後部外側接地部３８ｃ・３８ｃが幅広部３８ａから連続して形成されている。そして、その後部外側接地部３８ｃ・３８ｃの後端位置が後部外側接地部３８ｃ・３８ｃの左右内側に位置する幅狭部３８ｂの後端位置より前方に位置するよう短く形成されている。また、この中央接地フロ−ト３８が整地する植付位置Ｐ５・Ｐ６は、後部外側接地部３８ｃ・３８ｃと幅狭部３８ｂに左右に囲まれているが、後部外側接地部３８ｃ・３８ｃの後端位置が短く植付位置Ｐ付近に位置させ、しかも、フロ−ト底部の左右中央に形成した溝３８ｄの後端が、幅狭部３８ｂの後端まで抜けるように形成されているから、植付位置Ｐ５・Ｐ６に適度に泥水が存在するようになり、従って、植付位置における水の少なさからくる植付装置の苗の持ち帰り問題が生じにくいものとなっている。
【００２８】
図６において、表土面位置検出体を兼ねる中央接地フロ−ト３９は、前記中央接地フロ−ト３７と比べると、以下の点で異なる構成を示している。即ち、中央接地フロ−ト３９は、中央接地フロ−ト３７の底部の左右中央に形成した溝３７ｄが上方まで突き抜けて左右のフロ−ト体３９Ｒ・３９Ｌに分割構成され、その左右のフロ−ト体３９Ｒ・３９Ｌの上面を連結体４０で連結した構成となっている。よって、この中央接地フロ−ト３９は、前記中央接地フロ−ト３７と比べて、左右中央での泥水の後方への流れが更に良好である。
【００２９】
図７に示すものは、前記中央接地フロ−ト２５を備えたものと比べると、以下の点で異なる構成を示している。即ち、表土面位置検出体を兼ねる中央接地フロ−ト４１・４１を前記左右接地フロ−ト２６・２６と同形状のもの２枚を連結体４２で連結した構成とし、該２枚の中央接地フロ−ト４１・４１の各幅広部４１ａ・４１ａで植付位置Ｐ４〜Ｐ７の４箇所を整地するように設けている。なお、植付位置Ｐ３とＰ８は幅狭の整地板４３・４３で整地するよう設けている。この整地板４３・４３は、図では、その支持部材４３ａ・４３ａを中央接地フロ−ト４１・４１に固着して支持する構成としているが、苗植装置４の伝動ケ−ス１９に支持させても良い。また、この整地板４３・４３の前方で、後主車輪１０・１０とその左右外側に装着した補助車輪１０ａ・１０ａとの後方で、中央接地フロ−ト４１・４１の幅広部４１ａ・４１ａと左右接地フロ−ト２７・２７の幅広部２７ａ・２７ａの左右間に、幅広の車輪跡整地体（レ−キ）４４・４４を設けていて、後主車輪１０・１０と補助車輪１０ａ・１０ａの車輪跡を整地するようになっている。このように４つの接地フロ−ト４１・４１，２７・２７と２つの整地板４３・４３で構成すると、接地フロ−トの個数を従来より少なくできて簡易な構成となり、しかも、接地フロ−ト４１・４１，２７・２７の左右間隔が広くなって、泥水の後方への流れが上記のものより更に良好となり、且つ、中央接地フロ−ト４１・４１の表土面の上下方向の位置変化に対する追従性を充分に確保できて、苗の植付深さを高精度に制御でき、また、整地性も良好なものとなる。
【００３０】
なお、図６と図７における、連結体４０，４２は、金属板や合成樹脂等で構成し、また、連結箇所はフロ−ト前部側で連結しているが、一箇所だけでなく、複数箇所でもよい。また、図３〜図８におけるラインＣＬは、機体左右中央位置を示す。
【図面の簡単な説明】
【図１】１０条植え田植機を示す側面図。
【図２】苗植装置の昇降制御装置のブロック図。
【図３】接地フロ−トの構成を示す平面図。
【図４】接地フロ−トの別の構成を示す平面図。
【図５】接地フロ−トの別の構成を示す平面図。
【図６】接地フロ−トの別の構成を示す平面図。
【図７】接地フロ−トの別の構成を示す平面図。
【図８】接地フロ−トの従来例の構成を示す平面図。
【符号の説明】
１：１０条植え田植機
２：走行車体
３：昇降リンク装置
４：苗植装置
８：前輪
１０：後輪
１０ｃ：補助車輪
２５，３７，３８，３９：中央接地フロ−ト（表土面位置検出体）
２５ａ，３７ａ，３８ａ，３９ａ：中央接地フロ−トの幅広部
２５ａ’：干渉する部分
２６・２６，２７・２７：左右接地フロ−ト
Ｐ１〜Ｐ１０：植付位置
Ｗ：苗植付条間の幅[0001]
BACKGROUND OF THE INVENTION
  This invention belongs to the technical field of ten-row planting rice transplanters.
[0002]
[Prior art]
  Conventionally, the structure as shown in FIG. 8 has been considered as the float structure of the 10-row planting rice transplanter. That is, two central grounding floats A and A are provided on the left and right central sides, and the two central grounding floats A and A each have a wide portion a for leveling the planting positions P4 to P7 on the central side. , A were formed at the front of each float. Then, two left and right grounding floats B, B are formed on the front side of each of the left and right outer sides, and wide portions b, b for leveling the planting positions P3, P8 one by one are provided. Provide two left and right grounding floats C and C with wide sections c and c formed at the front part of each float to adjust the planting positions P1, P2, P9, and P10 at the left and right outer sides. The configuration was provided with six grounding floats. In FIG. 8, FW indicates the front wheel of the traveling vehicle body, and RW indicates the rear wheel of the traveling vehicle body.
[0003]
  In order to detect the vertical position change of the seedling planting device with respect to the topsoil surface in the lifting control device of the seedling planting device, the detection is performed at the ground center on the left and right center sides. Provide to serve as a float. In addition, the 10-row seedling planting device is heavier than the one with a small number of planting strips, so the grounding load of the grounding float when touching the surface of the paddy field is large, so The load required for the grounding float, which also serves as the top soil surface position detection body of the control device, to move up and down following the change in the vertical position of the top soil surface also increases. For this reason, in the above-described conventional configuration, the central grounding float that also serves as the topsoil surface position detection body of the lifting control device is the two central grounding floats A and A connected by the connecting body d. The ground contact area of two floats is ensured, and it is possible to move up and down following the change in the vertical position of the topsoil surface.
[0004]
[Problems to be solved by the invention]
  Since the above-mentioned conventional float structure can move up and down following the change in the top and bottom position of the topsoil surface with the two central grounding floats A and A, the top and bottom of the seedling planting device The position change in the direction can be detected satisfactorily, but the number of grounding floats is large, and as a result, the distance between the left and right grounding floats is narrowed and the muddy water between the grounding floats is reduced. There is a problem that the flow to the rear is not good, and as a result, the mud push to the left and right outer side increases and the posture of the seedling planted in the previous stroke is disturbed.
[0005]
[Means for Solving the Problems]
  In order to solve the above problems, the present inventionA pair of left and right front wheels (8) and rear wheels (10) are provided.Traveling body(2)Elevating link device on the back side(3)10-row planting device that can be moved up and down via(4)The seedling planting device(4)Seedling planting device to maintain the vertical position relative to the topsoil surface at the set height(4)10 planting positions in a rice transplanter with a lifting control device(P1 to P10)5 ground floats that level the ground in two places(25, 26, 26, 27, 27)Placed on the left and right sides of the ground(25, 26, 26, 27, 27)Central grounding float located on the left and right center side of(25)A seedling planting device in the lifting control device(4)It also serves as a detecting body for detecting a vertical position change with respect to the topsoil surface, and the center grounding float(25)Wide part of(25a)The width of the ground contact width in the left-right direction at the bottom of the plant(W)Is set to approximately twice or twice to 2.5 times the width.When the auxiliary wheel (10c) is mounted on the inner side of the rear wheel (10) in the left-right direction, the left and right end portions of the wide portion (25a) of the central ground float (25) interfere with the auxiliary wheel (10c). (25a ') is divided so that it can be removed.This is a 10-row planting rice transplanter.
[0006]
[Action]
  When the ten-row planting machine 1 of the present invention travels while planting seedlings in a paddy field, the five grounding floats 25, 26, 26, 27, and 27 have two planting positions P1 to P10, respectively. Gradually level and step on the topsoil surface while flowing muddy water well between the left and right grounding floats 26, 26, 27, 27. In the center grounding float 25, the grounding width in the left-right direction of the bottom of the wide portion 25a is set to be approximately twice or twice to 2.5 times the width W between the seedling planting strips. Thus, the center grounding float 25 performs a detection operation following the position change in the vertical direction of the topsoil surface well, and thus the position change in the vertical direction with respect to the topsoil surface of the seedling planting device 4 is detected well. It will be a thing. As a result, the seedling planting device 4 is controlled to move up and down so that the planting depth of the seedling is controlled with high accuracy and has good leveling.Further, when the auxiliary wheel 10c is mounted on the inner side in the left and right direction of the body of the rear wheel 10 in order to avoid an increase in turning radius during turning, the left and right end portions 25a ′ of the wide portion 25a of the central grounding float 25 are removed. Can respond.
[0007]
【The invention's effect】
  In this 10-row planting rice transplanter 1, five grounding floats 25, 26, 26, 27 and 27 for leveling 10 planting positions P1 to P10 in two places are arranged at intervals on the left and right. Therefore, the number of grounding floats is smaller than that of the prior art, and the structure is simple. In addition, the flow of muddy water between the left and right grounding floats 26, 26, 27, and 27 is good and the left and right outer sides are outward. There is little mud pushing and there is little disturbance in the posture of the seedlings planted in the previous stroke. Furthermore, the center grounding float 25 located on the left and right center side also serves as a detection body for detecting a vertical position change relative to the topsoil surface of the seedling planting device 4 in the lifting control device, and the center grounding floor 25 -The ground contact width in the left-right direction of the bottom of the wide portion 25a of the toe 25 is set to be approximately twice or twice to 2.5 times the width W between the seedling planting strips. The float 25 is able to detect and follow the position change in the vertical direction of the topsoil surface. As a result, the planting depth of the seedling is controlled with high accuracy and the leveling is also good. It will be a thing.Further, when the auxiliary wheel 10c is attached to the inner side of the rear wheel 10 in the left-right direction, the left and right end portions 25a 'of the wide portion 25a of the central grounding float 25 can be removed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, a 10-row planting rice transplanter 1 as an embodiment of the present invention will be described.
  The 10-row planting rice transplanter 1 is a riding-type rice transplanter, and a 10-row planting planting device 4 is mounted on the rear side of the traveling vehicle body 2 via the lifting link device 3 so as to be movable up and down and to be able to roll. It has a configuration. Further, a fertilizer tank 50 and a fertilizer feeding device 51 of the fertilizer application device 5 are attached to the rear portion of the traveling vehicle body 2. In this fertilizer applicator 5, the fertilizer in the fertilizer tank 50 is fed by the fertilizer feeding device 51, and the fed fertilizer receives wind from the blower 52 and passes through the transfer hose 53 to each grounding float. The fertilizer is provided from the fertilizer guide 54 and is applied to the soil.
[0009]
  The traveling vehicle body 1 includes an engine E installed on the fuselage frame 6, a mission case 7 fixed to the front end of the fuselage frame 6, and front wheel transmission frames on the left and right sides of the mission case 7. The front wheels 8 and 8 provided via the rear wheels and the rear wheel frame mounted on the rear end of the fuselage frame 6 so as to be freely rollable are provided via the rear wheel transmission cases 9 and 9 on both right and left sides. Rear wheels 10 and 10 are provided. The rotation of the output shaft of the engine E is transmitted to the input shaft of the mission case 7 via the belt transmission device, and the power input into the mission case 7 is transmitted to the gear transmission mechanism and the transmission in the mission case 7. It is transmitted to the front wheels 8 and 8, the rear wheels 10 and 10, and the seedling planting device 4 and the fertilizer application device 5 through the shaft. Further, a step 11 is mounted on the traveling vehicle body 1, a cover 12 that covers the upper side of the engine E is provided, and a cockpit 13 is installed on the cover 12. In front of the cockpit 13, a handle 14 is provided for rotating the front wheels 8, 8 about the vertical axis.
[0010]
  The elevating link device 3 is a link support frame extending in the vertical direction in which the front end portions of one upper link 15 and two lower links 16 and 16 are fixed to the rear end portion of the fuselage frame 6. It is a link structure in which each rear end portion is rotatably connected to a connecting link 18, and is attached to a lower portion of the connecting link 18 and a front portion of a transmission case 19 of the seedling planting device 4. The connecting shaft 20 that protrudes forward and is fixed is rotatably connected, and the seedling planting device 4 is connected to the lifting link device 3 in a freely rolling manner. An arm 21 extending downward is fixed to the traveling vehicle body 2 side of the upper link 15, and the arm frame 6 can be rotated around the left and right axis around the lower end of the arm 21. When the piston tip of the lifting hydraulic cylinder 22 to which the cylinder portion is attached is connected via the spring S in the spring case 23 and the lifting hydraulic cylinder 22 is expanded and contracted, the lifting link device 3 moves up and down. The seedling planting device 4 is configured to move up and down.
[0011]
  In addition, the raising / lowering control apparatus of the seedling planting device 4 shall operate | move by the control apparatus of a structure as shown in the block diagram of FIG. Specifically, the control device C is provided with ascending / descending control program CP1 that outputs a signal to a control output system related to lifting control in accordance with a signal of a control input system related to lifting control. The control input system connected to the control device C detects the operation position of the first switching lever L1 provided on the right side of the cockpit 13.PotentiometerSwitches SW1 and SW2 that are turned on and off by the operation of PM1 and a second switching lever L2 provided near the handle 14, and grounding floats 25, 26, 26, 27, provided on the bottom side of the seedling planting device 4 27, a potentiometer PM2 for detecting the vertical position of the front portion of the central grounding float 25 installed at the center of the left and right, and the elevation based on the position detection of the central grounding float 25 by the potentiometer PM2. A sensitivity setting unit 29 including a volume or the like for outputting a signal corresponding to the operation position of the sensitivity adjustment dial 28 for performing sensitivity adjustment in control, and a potentiometer PM3 for detecting the angle of the lower link of the lift link device 3 And are provided. Correspondingly, in the control output system connected to the control device C, the raising solenoid SOL1 for switching the raising / lowering hydraulic valve 24 to the side on which the seedling planting device 4 is raised and the seedling planting device 4 are lowered. A lowering solenoid SOL2 for switching the lifting hydraulic valve 24 is provided on the operating side. When the sensitivity adjustment dial 28 is operated to adjust the sensitivity setting device 29, the reference position H, which is the control target at the front of the center ground float 25, is changed up and down. When the reference position H at the front portion of the center grounding float 25 is set high, the angle at which the bottom surface of the center grounding floor 25 faces in the front-rear direction with respect to the topsoil surface decreases, and the center grounding float 25 The followability to the change in the vertical position of the topsoil surface becomes insensitive, and the sensitivity of the lifting control is adjusted to insensitive. Conversely, when the reference position H at the front of the center grounding float 25 is set low, the angle at which the bottom surface of the center grounding floor 25 faces in the front-rear direction with respect to the topsoil surface increases, and the center grounding floor 25 becomes larger. -The followability to the change in the vertical position of the topsoil surface of the top 25 becomes sensitive, and the sensitivity of the lifting control is adjusted sensitively.
[0012]
  The raising / lowering control device of the seedling planting device 4 configured as described above is controlled by the seedling planting device 4 according to the artificial operation of the first switching lever L1 or the artificial operation of the second switching lever L2. In addition, when the grounding floats 25, 26, 26, 27 and 27 are traveling on the field with the ground sliding on the paddy field topsoil, the center of the seedling planting device 4 following the change in the vertical position with respect to the topsoil surface. Based on the detection operation of the vertical movement of the front part of the grounding float 25, the seedling planting device 4 is controlled to move up and down so that the vertical position of the seedling planting device 4 with respect to the topsoil surface is maintained at the set position.
[0013]
  The seedling planting device 4 is moved up and down within a certain range by the expansion and contraction operation of the spring S interposed between the arm 21 of the upper link 15 and the lifting hydraulic cylinder 22. As a result, when the grounding floats 25, 26, 26, 27, and 27 are traveling on the field while being grounded and slid on the paddy field topsoil, the grounding floor is caused by a vertical position change of the seedling planting device 4 with respect to the topsoil surface. The seedling planting device is configured such that the spring S expands and contracts according to the ground pressure fluctuations of the belts 25, 26, 26, 27 and 27, and the ground floors 25, 26, 26, 27 and 27 maintain a predetermined ground pressure. 4 is moved up and down, and together with the raising and lowering control device of the seedling planting device 4 based on the vertical movement of the front part of the sensor float 25, the seedling planting device 4 is set to a predetermined height with respect to the paddy field topsoil surface. It is a mechanism that is maintained.
[0014]
  The seedling planting device 4 includes 10 rotary-type planting devices 28 for planting seedlings on the paddy topsoil, and 10 seedlings on which the seedlings to be supplied to the respective planting devices 28 are placed correspondingly. A seedling mounting table 29 having a minute seedling mounting part is provided. The seedling mount 29 is installed in a posture in which the front side is high and the rear side is low and inclined in the front-rear direction, and is provided so as to reciprocate left and right in conjunction with the operation of the planting devices 28. Below the seedling table 29, transmission to the planting devices 28, transmission to the right and left reciprocating operation mechanism of the seedling table 29, and seedling feeding belts provided at each seedling mounting part of the seedling table 29. A transmission case 19 having a transmission mechanism for transmitting power to 30 seedling feeding operation mechanisms is provided. A float support pipe 31 is provided at the bottom of the transmission case 19 so as to be capable of adjusting the rotation, and is attached to the tip of a float support arm 32 which is fixed to each part of the float support pipe 31. The grounding floats 25, 26, 26, 27, and 27 are arranged so that the shaft core X is disposed at substantially the same position as the position P in the front-rear direction of the planting position, and the shaft core X is directed in the left-right direction. It is attached to the shaft 33 so as to be rotatable. The grounding floats 25, 26, 26, 27, and 27 are installed in a total of five, one at the center of the left and right sides and two on the left and right sides of the ten-row planting device 4. It has become. 3 to 8, the alternate long and short dash line on each grounding float indicates the position of the axis X of the shaft 33 along the position P in the front-rear direction of the planting position, and the axis is at that position. It shows that the grounding float is supported so as to be able to turn around 33.
[0015]
  The grounding floats 25, 26, 26, 27, and 27 are formed in a warped shape when viewed from the side of the fuselage, and the front side is wider than the rear side and the rear side is directed to the front side in plan view. On the other hand, seedling planting positions P1 to P10 are set on the left and right sides of the front side of the narrow parts 25b, 26b, 26b, 27b, 27b on the rear side, and the top soil surface of the left and right seedling planting positions is formed. The wide portions 25a, 26a, 26a, 27a, 27a on the front side are leveled. Accordingly, the grounding floats 25, 26, 26, 27, and 27 are configured to level each of the seedling planting positions P1 to P10.
[0016]
  And the center grounding float 25 installed in the left-right center among the said grounding floats is the detection body for detecting the position change of the up-down direction with respect to the topsoil surface of the seedling planting apparatus 4 in a raising / lowering control apparatus as mentioned above. Also serves as a topsoil surface position detector. As shown in FIG. 3, the center grounding float 25 is formed in a shape different from the same-shaped left and right grounding floats 26, 26, 27 and 27 installed on the left and right sides thereof. The front wide portion 25a of the float 25 is formed wider than the front wide portions 26a, 26a, 27a, 27a of the left and right grounding floats 26, 26, 27, 27. The left and right widths of the grounding floats 25, 26, 26, 27, and 27 are provided to be substantially the same as the left and right widths of the bottom grounding surface.
[0017]
  Specifically, the center grounding float 25 has both left and right end positions of the wide portion 25a at the seedling planting positions P5 and P6 where the center grounding float 25 is leveled and the adjacent left and right grounding floats 26 and 26. Seedlings in which the right and left center positions W2C and W3C of the seedling planting strips W2 and W3 with the seedling planting positions P4 and P7 where the ground is leveled and the left and right grounding floats 26 and 26 adjacent to the central grounding floor 25 are leveled It is provided so as to be located between the planting positions P4 and P7. It should be noted that the left and right end positions of the wide portion 25a of the center ground float 25 may be provided at the left and right center positions W2C and W3C.
[0018]
  On the other hand, the left and right grounding floats 26, 26, 27, and 27 have the left and right end positions of the wide portions 26a, 26a, 27a, and 27a at the seedling planting positions P1, P2, P3, where the grounding ground is leveled. Center positions W1C, W2C, W3C, and W4C between the seedling planting strips W1, W2, W3, and W4 between P4, P7, P8, P9, and P10 and the next seedling planting position where the adjacent grounding float is leveled; Between the two.
[0019]
  That is, the bottom contact width of the wide portion 25a of the center ground float 25 is set to the width W between the seedling planting strips (generally set at regular intervals between the planting positions P1 to P10, for example, 30 cm, The width 26a of the left and right grounding floats 26, 26, 27, and 27 is set to be approximately twice or twice to 2.5 times the width. , 26a, 27a, and 27a are set to be approximately 1.5 times as wide as the width W between the seedling planting strips. Further, the bottom grounding width of the wide portion 25a of the center grounding float 25 is wider from the vicinity of the front end position of the left and right grounding floats 26, 26, 27 and 27 than the rear side portion 25d of the airframe front side portion 25c. Thus, the bottom contact area of the wide portion 25a of the center ground float 25 is increased. Note that the rear side portion 25d of the wide portion 25a of the center grounding float 25 is too narrow with the wide portions 26a, 26a of the adjacent left and right grounding floats 26, 26, so that the muddy water flows backward. The width is set appropriately to prevent the image from becoming too bad.
[0020]
  Further, the front and rear width of the wide portion 25a of the center grounding float 25 is wider than the front and rear widths of the wide portions 26a, 26a, 27a and 27a of the left and right grounding floats 26, 26, 27 and 27. The front / rear width of the center grounding float 25 is positioned forward of the front end positions of the left and right grounding floats 26, 26, 27, and 27. The ground width in the front-rear direction of the wide portion 25a of the ground float 25 is approximately twice the ground width in the front-rear direction of the wide portions 26a, 26a, 27a, 27a of the left and right ground floats 26, 26, 27, 27, or In view of this, the bottom contact area of the wide portion 25a of the center ground float 25 is increased.
[0021]
  The left and right grounding floats 26, 26, 27, and 27 are arranged so as to level the wheel marks of the traveling vehicle body 2. That is, the treads of the front wheels 8 and 8 and the rear wheels 10 and 10 of the traveling vehicle body 2 are set to substantially the same tread, and the wheel marks of the front wheels 8 and 8 and the rear wheels 10 and 10 are the left and right ground contact floats on the inner side. 26 and 26 are arranged to perform. Further, in order to improve the propulsive force of the traveling vehicle body 2 in the paddy field and to reduce the left and right inclination of the traveling vehicle body 2 due to the unevenness of the field (cultivating board), as shown in FIG. When the auxiliary wheels 10a, 10a; 10b, 10b are provided on the outer sides of the main wheels 10 and 10 in the left-right direction, the wheel marks of the outer auxiliary wheels 10b and 10b are The wheel traces of the auxiliary wheels 10a, 10a on the inner side are ground leveling bodies (rakes) for wheel traces 34, 34 (the plate body is comb-shaped in plan view so as not to obstruct the muddy water flow as much as possible. The shape is good, but the shape or the like is not limited as long as it has the effect of leveling the wheel marks). By the way, when the outer auxiliary wheels 10b, 10b are attached, the turning radius during turning increases.ButIn order to avoid this, when the auxiliary wheels 10c and 10c are mounted on the inner side in the left and right direction of the rear wheels (rear main wheels) 10 and 10 instead of the outer auxiliary wheels 10b and 10b, the center grounding float 25 is used. Since it interferes with the left and right end portions of the wide portion 25a, when the auxiliary wheels 10c and 10c are mounted by dividing the interference portions 25a 'and 25a' in advance so that the interfering portions 25a 'and 25a' can be removed, Although the ground contact area is small, the portions 25a ′ and 25a ′ are removed so as to cope with them.
[0022]
  Further, the left and right grounding floats 27 and 27 on the outermost side in the left and right direction of the machine also serve as detection bodies for performing rolling control so as to maintain the seedling planting device 4 in a posture parallel to the topsoil surface. When either one of the left and right rolling detectors 35R and 35L detects that one of the left and right sides of the left and right grounding floats 27 and 27 has been moved upward with its front portion pushed up above the set position. Then, assuming that the side is lower than the topsoil surface, the rolling drive device 36 is driven so that the side becomes higher, and the seedling planting device 4 is controlled to roll. When both the left and right sides of the rolling detectors 35R and 35L are in the detection state, or when both the left and right sides are in the non-detection state, the seedling planting device 4 is parallel to the topsoil surface within the set range with respect to the topsoil surface. The rolling drive device 36 is not driven, assuming that it is in a posture. The control program CP2 for the rolling control is provided as software in the control device C.
[0023]
  In addition, grooves 25e, 26c, 26c, 27c and 27c for allowing muddy water to flow rearward are formed on the left and right central sides of the bottom of each grounding float 25, 26, 26, 27 and 27. It is provided so that mud pushing is minimized. As shown in FIG. 3, this groove is widened like a fan on the left and right sides, receives a muddy water flow toward the left and right center side of the float, and is guided to a narrow groove on the left and right following it. It is supposed to be. The rear end of the groove is formed up to the front end of the float without coming out to the rear end of the float, so that the muddy water flowing in the groove is suppressed to the top soil of the float ground surface. In addition, this causes the rear side of the float to be pushed upward, but this also prevents the front side of the float from floating due to the muddy water flow.
[0024]
  The 10-row planting rice transplanter 1 configured as described above enters the paddy field, descends the seedling planting device 4, and the grounding floats 25, 26, 26, 27, and 27 are in contact with the topsoil surface. When the seedling planting device 4 is run while operating, the seedling planting device 4 is operated by each planting device 28... Planting seedlings one by one from the seedling mount 29 and planting 10 seedlings. It will run.
[0025]
  And in this 10-row planting rice transplanter 1, five grounding floats 25, 26, 26, 27 and 27 for leveling the two planting positions P1 to P10 in two places are arranged at right and left intervals. Therefore, the number of grounding floats is smaller than that of the conventional construction, and the muddy water flow between the left and right grounding floats 26, 26, 27, and 27 is good and the left and right outer sides. There will be little mud pushing and there will be little disturbance in the posture of the seedlings planted in the previous stroke. Furthermore, the center grounding float 25 located on the left and right center side also serves as a detection body for detecting a vertical position change relative to the topsoil surface of the seedling planting device 4 in the lifting control device, and the center grounding floor 25 -The ground contact width in the left-right direction of the bottom of the wide portion 25a of the toe 25 is set to be approximately twice or twice to 2.5 times the width W between the seedling planting strips. The float 25 is able to detect and follow the position change in the vertical direction of the topsoil surface. As a result, the planting depth of the seedling is controlled with high accuracy and the leveling is also good. It will be a thing.
[0026]
  Below, the thing of a different structure from the said structure is shown.
  In FIG. 4, the center grounding float 37 that also serves as a topsoil surface position detector has a different configuration from the center grounding float 25 in the following points. That is, rear outer grounding portions 37c and 37c that are located on the left and right outer sides of the narrow portion 37b and are grounded between the planting positions P4 and P5 and between the planting positions P6 and P7 from the front side to the rear side from the planting position. Is formed continuously from the wide portion 37a. The rear end position of the narrow portion 37b located on the left and right inner sides of the rear outer grounding portions 37c and 37c is formed to be shorter than the rear end position of the rear outer grounding portions 37c and 37c. Further, since the central grounding float 37 is supported at two locations, the left and right rear outer grounding portions 37c and 37c, it is possible to support the left and right wide floats 37 that are difficult to twist left and right. In addition, the planting positions P5 and P6 where the central grounding float 37 is leveled are surrounded by the rear outer grounding parts 37c and 37c and the narrow part 37b on the left and right, but the rear end position of the narrow part 37b is Since the rear end of the groove 37d formed short in the planting position P and at the center of the left and right of the bottom of the float is formed so as to come out to the rear end of the narrow portion 37b, the planting position P5・ P6 has moderately muddy water, and therefore, it is difficult for the planting device seedling to take home due to the small amount of water at the planting position.
[0027]
  In FIG. 5, the center grounding float 38 also serving as a topsoil surface position detector has a different configuration from the center grounding float 25 in the following points. That is, rear outer grounding portions 38c and 38c that are located on the left and right outer sides of the narrow portion 38b and are grounded between the planting positions P4 and P5 and between the planting positions P6 and P7 from the front side to the rear side from the planting position. Is formed continuously from the wide portion 38a. The rear end positions of the rear outer grounding portions 38c and 38c are formed to be shorter than the rear end positions of the narrow portions 38b positioned on the left and right inner sides of the rear outer grounding portions 38c and 38c. Further, the planting positions P5 and P6 where the central grounding float 38 is leveled are surrounded by the rear outer grounding portions 38c and 38c and the narrow portion 38b on the left and right, but the rear outer grounding portions 38c and 38c are rearward. Since the end position is short and located near the planting position P, and the rear end of the groove 38d formed in the left and right center of the bottom of the float is formed so as to come out to the rear end of the narrow portion 38b. Muddy water is appropriately present at the attachment positions P5 and P6. Therefore, the problem of taking out the seedlings of the planting apparatus due to the small amount of water at the planting position is less likely to occur.
[0028]
  In FIG. 6, the center grounding float 39 also serving as a topsoil surface position detector has a different configuration from the center grounding float 37 in the following points. That is, the center grounding float 39 is divided into left and right float bodies 39R and 39L with a groove 37d formed in the left and right center at the bottom of the center grounding float 37 penetrating upward. The upper surface of the body 39R / 39L is connected to the connecting body 40.Connected withIt has become the composition. Therefore, the center grounding float 39 has a better flow toward the rear of the muddy water at the center of the left and right than the center grounding float 37.
[0029]
  The structure shown in FIG. 7 is different from that having the center grounding float 25 in the following points. That is, the central grounding floats 41 and 41 that also serve as the topsoil surface position detectors are connected to each other by the connecting body 42 in the same shape as the left and right grounding floats 26 and 26, and the two central grounding grounds are connected. The wide portions 41a and 41a of the floats 41 and 41 are provided so as to level the four locations of the planting positions P4 to P7. The planting positions P3 and P8 are provided so as to be leveled by narrow leveling plates 43 and 43. In the figure, the leveling plates 43 and 43 are configured such that the supporting members 43a and 43a are fixedly supported to the central grounding floats 41 and 41, but are supported by the transmission case 19 of the seedling planting device 4. May be. Further, in front of the leveling plates 43 and 43, behind the rear main wheels 10 and 10 and auxiliary wheels 10a and 10a mounted on the left and right outer sides thereof, the wide portions 41a and 41a of the center grounding floats 41 and 41, Wide wheel mark leveling bodies (rakes) 44, 44 are provided between the left and right of the wide portions 27a, 27a of the left and right grounding floats 27, 27, and the rear main wheels 10, 10 and the auxiliary wheels 10a, 10a are provided. It is designed to level the wheel traces. In this way, when the four grounding floats 41, 41, 27, and 27 and the two ground leveling plates 43 and 43 are constructed, the number of grounding floats can be reduced as compared with the prior art. The distance between the left and right sides of the ground 41, 41, 27, 27 becomes wider, the flow of muddy water to the rear becomes even better than the above, and the vertical position change of the top soil surface of the center grounding float 41, 41 Can be sufficiently secured, the planting depth of the seedling can be controlled with high accuracy, and the leveling property is also good.
[0030]
  In addition, although the connection bodies 40 and 42 in FIG. 6 and FIG. 7 are comprised with a metal plate, a synthetic resin, etc., and the connection location is connected by the float front part side, not only one location, Multiple locations may be used. Moreover, the line CL in FIGS. 3-8 shows the left-right center position of a body.
[Brief description of the drawings]
FIG. 1 is a side view showing a 10-row planting rice transplanter.
FIG. 2 is a block diagram of a lifting control device for a seedling planting device.
FIG. 3 is a plan view showing a configuration of a grounding float.
FIG. 4 is a plan view showing another configuration of the grounding float.
FIG. 5 is a plan view showing another configuration of the grounding float.
FIG. 6 is a plan view showing another configuration of the grounding float.
FIG. 7 is a plan view showing another configuration of the grounding float.
FIG. 8 is a plan view showing a configuration of a conventional example of a grounding float.
[Explanation of symbols]
1:10 row planting rice transplanter
2: Running body
3: Elevating link device
4: Seedling planting equipment
8: Front wheel
10: Rear wheel
10c: Auxiliary wheel
25, 37, 38, 39: Center grounding float (surface soil surface position detector)
25a, 37a, 38a, 39a: wide part of the center grounding float
25a ': Interfering part
26, 26, 27, 27: Left and right grounding float
P1 to P10: planting position
W: Width between seedling planting strips

Claims

A 10-row seedling planting device (4) is mounted on the rear side of a traveling vehicle body (2) having a pair of left and right front wheels (8) and a rear wheel (10) via a lifting link device (3) so as to be movable up and down. in該苗planting device (4) planting machine provided with the elevation control device for lifting the NaeUe device (4) so as to maintain the high set the vertical position of relative topsoil surface of planting position of 10 points ( five of the ground flow to two places at a time leveling the P1~P10) - door (25, 26, 26, 27, 27) spaced apart to the left and right place, the ground flow - door (25, 26, 26, 27 27) The central grounding float (25) located on the left and right center side of 27) also serves as a detection body for detecting a vertical position change of the seedling planting device (4) in the elevation control device with respect to the topsoil surface. and, the central ground furo - wide portion of the bets (25) the bottom of (25a) The contact width in the lateral direction is set to a width of 2.5 times 2 times or twice substantially the width between Article seedling planting (W), an auxiliary in horizontal direction of the machine body inside of the rear wheel (10) When the wheel (10c) is attached, the left and right end portions (25a ′) of the wide portion (25a) of the central grounding float (25) that interferes with the auxiliary wheel (10c) can be removed. A 10-row planting rice transplanter.