JP3585627B2

JP3585627B2 - Earth removal equipment

Info

Publication number: JP3585627B2
Application number: JP04884396A
Authority: JP
Inventors: 卓蔵河村; 英樹清野
Original assignee: Yanmar Co Ltd
Current assignee: Yanmar Co Ltd
Priority date: 1996-03-06
Filing date: 1996-03-06
Publication date: 2004-11-04
Anticipated expiration: 2016-03-06
Also published as: JPH09242112A

Description

【０００１】
【発明の属する技術分野】
本発明は、旋回作業車の走行装置等にフレームを上下回動可能に枢支し、該フレーム先端に具備する排土板にて土壌表面を掻き均して排土作業を行う排土装置の構造に関する。
【０００２】
【従来の技術】
従来、例えば、特開平７−３００８７６に示すように旋回作業車等においては、その走行装置（クローラ走行装置）に排土装置を具備したものが公知となっており、この構造は、左右並設状のフレームの両基端を走行装置等に上下回動可能に枢支し、両フレーム先端には排土板を跨設し、両フレーム間において、基端寄り部分と排土板との間に油圧シリンダー等の伸縮式アクチュエーターを連結したものとなっている。
このような構造の排土装置の中で、両フレーム間の基端・先端間には、従来、補強部材としての円管材、或いは角管材が横設されていた。
【０００３】
【発明が解決しようとする課題】
まず、両フレーム間に横設する補強部材は、前記の排土用シリンダーの直下方に配設されるので、この補強部材の上端が該排土用シリンダーと干渉する位置が、排土装置の上方回動限界位置となる。この排土装置を履帯走行式の旋回作業車に採用する場合、上方回動限界位置を高く取れれば、排土装置を上方回動限界位置にしておくことで、両履帯間の最低地上高を高くとることができる。
ところが、小旋回向きの旋回作業車においては、本体部の後部が削除されて前後の重心バランスが悪くなる関係から、車高をなるべく低くする。従って、排土装置全体の位置も低くすることとなる。その一方で、地上最低高を元の車高の時と同じに確保しようとすれば、排土装置の上方回動限界位置を高く取る必要がある。ところが、補強部材と排土用シリンダーとの干渉によって、これが阻害されるのである。
【０００４】
なお、円管材は、強度上、口径を長くするので、どうしても縦長状となり、それだけ排土用シリンダーとの隙間が小さくなり、排土装置の回動中におけるアクチュエーターとの干渉位置（回動上限位置）も低くなるが、角管材ならば、断面視四角形状を、縦が短く、横が長いものにすることで、強度を確保するとともに排土用シリンダーとの隙間も広くなり、回動上限位置も高くできる。しかし、角管材では、その上に土砂が溜まりやすいという不具合がある。
【０００５】
【課題を解決するための手段】
本発明は以上のような課題を解決するため、次のような手段を用いる。
請求項１においては、左右並設状のフレーム２・２の基端を上下回動可能に枢支し、両フレーム２・２の先端に排土板１を跨設し、両フレーム２・２の間に基端寄り部分と排土板１とを連結する排土用シリンダー４を配設してなる排土装置において、該両フレーム２・２間の基端と先端の間で、該排土用シリンダー４の下方に補強部材３Ａを横設し、該補強部材３Ａを横長の楕円形状管にて構成し、該補強部材３Ａを排土用シリンダー４の伸縮方向の幅内に設け、排土装置Ａの回動上限位置Ｈを高くしたものである。
【０００６】
請求項２においては、左右並設状のフレーム２・２の基端を上下回動可能に枢支し、両フレーム２・２の先端に排土板１を跨設し、両フレーム２・２の間に基端寄り部分と排土板１とを連結する排土用シリンダー４を配設してなる排土装置において、該両フレーム間２・２の基端と先端の間で、該排土用シリンダー４の下方に補強部材３Ｂを横設し、該補強部材３Ｂを円管材にて構成し、該円管材にて構成した補強部材３Ｂは、排土用シリンダー４との当接部分を、排土用シリンダー４と反対側に凹設して、凹設部３Ｂａを設けた形状とし、該補強部材３Ｂを排土用シリンダー４の伸縮方向の幅内に設け、排土装置Ａの回動上限位置Ｈを高くしたものである。
【０００７】
【発明の実施の形態】
本発明に係る旋回作業車の実施の形態について説明する。
図１は本発明に係る排土装置Ａを具備する旋回作業車の全体斜視図、
図２は補強部材３Ａを具備する排土装置Ａの側面図、
図３は補強部材３Ａを具備する排土装置Ａと従来の補強部材３’を具備する排土装置Ａ’の各回動上限位置の比較を示す側面断面図、
図４は補強部材３Ｂを具備する排土装置Ａと従来の補強部材３’を具備する排土装置Ａ’の各回動上限位置の比較を示す側面断面図、
図５は補強部材３Ｂの正面図、
図６は切削部１ａにスペーサ５を取り付けた排土装置Ａの部分側面図、
図７は掘削溝Ｍが車体の左右中央に位置する場合の、排土装置Ａにスペーサ５を取り付けた旋回作業車による溝の掘削作業を示す図であって、（ａ）は正面図、（ｂ）は平面図、
図８は掘削溝Ｍが車体の右端に位置する場合の、排土装置Ａにスペーサ５を取り付けた旋回作業車による溝の掘削作業を示す図であって、（ａ）は正面図、（ｂ）は平面図である。
【０００８】
本実施例は、図１の如く、本発明に係る排土装置Ａを旋回作業車に採用するものである。
まず、旋回作業車の概略構成は、左右に履帯７・７を左右に巻装する走行フレーム６上に本体フレーム８を旋回可能に搭載し、該本体フレーム８の前端に、ブーム９、アーム１０、バケット１１よりなる掘削作業腕Ｂを支持したものとなっている。なお、この旋回作業車は、本体フレーム８の後端を円形状とする等、膨出しないようにして、旋回時に、本体フレーム８が履帯７・７より外側にはみ出さない小旋回仕様となっており、本体フレーム８の上にはボンネット８ａ等が、やはり旋回時に履帯７・７からはみ出さないように搭載されている。
【０００９】
この旋回作業車における排土装置Ａの支持構造を説明する。
走行フレーム６の両履帯７・７間において、左右の排土装置ブラケット６ａ・６ａと、シリンダーブラケット６ｂとを突設しており、両排土装置ブラケット６ａ・６ａには、排土装置Ａの左右フレーム２・２の基端を上下回動可能に枢支し、該排土用シリンダー６ｂには、油圧駆動の排土用シリンダー４のピストンロッド先端を枢支している。
【００１０】
排土装置Ａの構成について説明する。
基端を前記の如く走行フレーム６に枢支した左右フレーム２・２の両先端に排土板１を跨設しており、該排土板１の後部には、排土用シリンダー４の基端を枢支している。そして、排土用シリンダー４の下方には、左右フレーム２・２間に、図２及び図３図示の補強部材３Ａ又は図４及び図５図示の３Ｂを横設している。
従来は、例えば図３及び図４図示のような円管材の補強部材３’を横設していた。これに対し、まず補強部材３Ａは、縦方向を短径、横方向を長径とする楕円形状にしている。これは従来の補強部材３’として使用していた円管材を上下に抑圧することで構成できるものである。
また、補強部材３Ｂは、従来の補強部材３’の如き円管材における排土用シリンダー４の直下方に位置する上端部分（排土用シリンダー４に当接する部分）を、排土用シリンダー４と反対側に凹設して、凹設部３Ｂａを設けた形状となっている。
【００１１】
補強部材３Ａも３Ｂも、その上端と、その上方に配設される排土用シリンダー４との隙間を、従来の補強部材３’に比して拡大したものであり、これによって図３及び図４のように、該補強部材３Ａ又は３Ｂと排土用シリンダー４とが干渉する排土装置Ａの回動上限位置Ｈ（これは、フレーム２基端の枢支点２ａに対する相対位置である。）が、補強部材３’を使用する場合に該補強部材３’と排土用シリンダー４とが干渉する排土装置Ａの回動上限位置Ｈ’よりも高くなる。
【００１２】
ここで、もしも該排土装置Ａを支持する旋回作業車が、図１に図示するような本体フレーム８の後部が円形状でない、従来の後部が後方に膨出した型式のものであれば、重心が後方にかかるので、車高、即ち走行フレーム６の高さも従来のままでよく、履帯７・７間の地上最低高（路面に凹凸がある場合に、凸状部がこの高さまでならば履帯７・７間を通過できるという高さ）となる排土装置Ａの回動上限位置も、従来の補強部材３’を用いていた時の高さ（図３及び図４図示のＨ’）で充分である。
しかし、本実施例に係る旋回作業車は、前記の如く、小旋回仕様のため、本体フレーム８の後部が膨出しておらず、重心が、掘削作業腕Ｂの支持される前方に偏る傾向があり、これを補うべく、走行フレーム６を低くして車高を下げている。従って、ブラケット６ａ・６ｂの位置も低くなるので、排土用シリンダー４も含めて、排土装置Ａ全体が低くなる。この場合、従来の補強部材３’を用いた排土装置Ａの回動上限位置Ｈ’では、地上最低高を下げてしまうこととなる。
【００１３】
この場合に、補強部材３Ａや３Ｂを有する排土装置Ａであると、回動上限位置Ｈが、従来の補強部材３’を有する排土装置Ａの回動上限位置Ｈ’よりも高くなっているので、結果的に、従来の補強部材３’を用いた排土装置Ａの回動上限位置Ｈ’と地上高を同じに確保することができる。即ち、車高を低くしたにも拘らず、履帯７・７間の最低地上高を、従来と同じ高さに確保できるのである。
【００１４】
なお、排土用シリンダー４と補強部材との間の隙間は、補強部材を、縦が短い角管材で構成することでも拡張できるが、土砂が溜まるという不具合がある。この点で、補強部材３Ａ・３Ｂとも、円管材を抑圧加工等して構成されており、曲面を有するので、土砂が滑落し、上に溜まることはない。
【００１５】
次に、排土板１の切削部１ａに付設するスペーサ５について説明する。
排土板の下縁には、排土に際して土砂内に排土板を確実に挿入できるように、切削部が設けられていることは公知となっている。
ここで、排土装置を装着した旋回作業車にて溝の掘削作業を行う場合について、図９乃至図１１にて説明する。
図９は掘削溝Ｍが車体の左右中央部に位置する場合の、排土装置Ａの切削部１ａを直接接地しての旋回作業車による溝の掘削作業を示す平面図、図１０は掘削溝Ｍが車体の右端に位置する場合の、排土装置Ａの切削部１ａを直接接地しての旋回作業車による溝の掘削作業を示す平面図、図１１は排土装置Ａの切削部１ａを直接接地しての旋回作業車による溝の掘削作業を示す側面図である。
【００１６】
溝の掘削作業に際しては、掘削作業腕Ｂを掘削溝Ｍ内に挿入する一方、排土装置Ａは、掘削溝Ｍ内の排土作業を行わない限り、掘削溝Ｍの手前に位置させており、この時、作業時に車体が前後に振れないよう、図１１のように、排土板１の下縁の切削部１ａを路面に当接させている。溝は作業腕Ａを手前側に引く方向に掘り進めるので、車体を後方に移動させていくが、この際に、切削部１ａの下端が路面を擦り、図９及び図１０に図示されるような傷Ｋを付けるおそれがある。
このように路面に傷Ｋがついた場合、溝の掘削を進めていけば、掘削溝Ｍと重合する部分については問題ないわけだが、排土板１の幅は、掘削溝Ｍの幅よりも長いので、掘削溝Ｍが穿設されない場所では路面の傷Ｋが残る。
【００１７】
このような排土板（切削部）の直接的な接触による路面の傷付け防止の構造としては、図１２乃至図１４のように、排土板１の裏側の左右（クローラ７・７の手前位置）に、上下回動可能な保護部材１２・１２を設けたものが公知となっている。
なお、図１２は保護部材１２・１２を取り付けた排土装置Ａの平面図、図１３は同じく保護部材１２を接地状態とした場合の側面図、図１４は同じく保護部材１２を収納状態とした場合の側面図である。
【００１８】
この、排土板による路面の傷付け防止構造に関しては、前記の従来技術に開示したどの保護部材を使用する場合にも、溝を掘り進める際には、保護部材を接地したままで車体を移動させるが、この時にやはり保護部材が路面を擦るので、必ずしも傷が付かないとは言えない。
前記の各保護部材の取付構造では、いずれも取付位置が排土板の左右端位置と固定されている。従って、溝の掘り進めに際して、掘削溝と保護部材を接地していた路面とが必ずしも重合せず、保護部材にて擦れて傷が付いた路面がそのまま残されるという可能性もある。
また、前記の保護部材１２の構造では、図１４の如く、収納時の保護部材１２と履帯７との間に土砂Ｓが引っ掛かるという不具合もあった。
【００１９】
該保護部材１２は、通常の排土作業時には図１４のように上げて収納状態にして、排土板１の切削部１ａを直接土壌に接触させるようにし、掘削作業等で、前後方向の安定性を確保したい時に、図１３のように保護部材１２を降ろして接地させるものである。
なお、これと同類の構造が、実開平７−３１９６０にて開示されており、いずれも排土板の左右端にて、格納状態と接地状態に位置変動自在、或いは着脱自在の保護部材を配設したものとなっている。
【００２０】
次に、排土板１の下縁部に取り付けるスペーサ５について説明する。
排土板１の下縁部には、図１及び図６のように、排土板１の全幅にわたって切削部１ａが固設されている。本発明に係る排土装置Ａにおいては、図１の如く、該切削部１ａの全幅にわたって複数個の螺子孔１ｂ・１ｂ・・・を穿設している。
そして、これらの中から螺子孔１ｂを選択して、スペーサ５を、該切削部１ｂの幅方向における任意の位置に、図１及び図６のように螺止することができる。
【００２１】
該スペーサ５の幅Ｌ１は、掘削溝Ｍの幅Ｌ２よりも短いものとする。（該幅Ｌ２は、必ずバケット１１の幅よりも長くなるので、該スペーサ５の幅Ｌ１をバケット１１の幅よりも短いように設定してもよい。）本実施例の旋回作業車にて溝の掘削作業を行う場合、図７及び図８のように、該スペーサ５を掘削溝Ｍの位置に合わせて排土板１の切削部１ａの適宜位置に取り付ける。
こうすることで、掘削溝Ｍの手前の路面上にてスペーサ５が接地し、一方、溝が掘削される場所以外の路面では、該スペーサ５の幅Ｌ２が掘削溝Ｍの幅Ｌ１よりも短いことから、排土板１の切削部１ａが地表より浮いた状態となり、掘削溝Ｍから外れた場所の路面を傷付けることはない。
そして、溝の掘り進めで車体を移動させる際に、仮にスペーサ５にて路面を擦って傷（図７及び図８中のＫ’）を付けたとしても、掘削溝Ｍと重合するので問題はない。従って、スペーサ５を装着して溝の掘削作業を行うと、路面に傷を付けずに作業を終えることができるのである。
【００２２】
そして、このように構成することで、排土板下縁の切削部の幅方向における任意の位置にスペーサを取り付けられるので、この排土装置を装着した旋回作業車にて溝の掘削作業を行う場合に、該スペーサを、掘削溝の手前の位置にて装着して路面の接地させられ、スペーサが掘削溝よりも幅狭なので、溝の掘削で車体を移動させても、溝が掘削される以外の場所では、切削部が路面から浮き上がった状態となり、路面に傷が付くことがない。
そして、仮にスペーサを接地した路面が車体移動の際に傷付いても、掘削溝と重合するので傷は消えてしまう。従って、路面に全く傷を付けることなく、溝の掘削作業を行うことができるのである。
また、スペーサの不要の時には、切削部より螺子を外して容易に取り外すことができ、従来の左右に配設していた保護部材と違い、一個のみであるので、車体の適当な場所に保管でき、従来のように保護部材の収納時に土砂が溜まるという不具合は生じないのである。
【００２３】
【発明の効果】
本発明は以上のように排土装置を構成することにより、次のような効果を奏する。
即ち、請求項１及び２のように構成することにより、補強部材と排土用シリンダー４との間の隙間が広がり、排土装置の回動上限位置が、従来の円管材の補強部材を有する排土装置に比べて高くなる。
そのため、小旋回仕様で車高の安定性を高めるために低くしたい旋回車輌に、この排土装置を装着すれば、地上最低高、即ち、排土装置との干渉が回避できる路面の凸状部の許容高さを、従来通り、或いは従来より高く取ることができ、しかも、旋回車輌の全高は、従来より低く、または、従来通りにできるので、安定性を高められる。
【００２４】
また、請求項１及び請求項２記載の補強部材は円管材を圧縮加工したり、その一部を抑圧するだけで構成でき、加工が容易であり、更に、角管材と違って、曲面を有し、土砂が滑落して、補強部材の上に溜まることがない。
【図面の簡単な説明】
【図１】本発明に係る排土装置Ａを具備する旋回作業車の全体斜視図である。
【図２】補強部材３Ａを具備する排土装置Ａの側面図である。
【図３】補強部材３Ａを具備する排土装置Ａと従来の補強部材３’を具備する排土装置Ａ’の各回動上限位置の比較を示す側面断面図である。
【図４】補強部材３Ｂを具備する排土装置Ａと従来の補強部材３’を具備する排土装置Ａ’の各回動上限位置の比較を示す側面断面図である。
【図５】補強部材３Ｂの正面図である。
【図６】切削部１ａにスペーサ５を取り付けた排土装置Ａの部分側面図である。
【図７】掘削溝Ｍが車体の左右中央に位置する場合の、排土装置Ａにスペーサ５を取り付けた旋回作業車による溝の掘削作業を示す図であって、（ａ）は正面図、（ｂ）は平面図である。
【図８】掘削溝Ｍが車体の右端に位置する場合の、排土装置Ａにスペーサ５を取り付けた旋回作業車による溝の掘削作業を示す図であって、（ａ）は正面図、（ｂ）は平面図である。
【図９】掘削溝Ｍが車体の左右中央部に位置する場合の、排土装置Ａの切削部１ａを直接接地しての旋回作業車による溝の掘削作業を示す平面図である。
【図１０】掘削溝Ｍが車体の右端に位置する場合の、排土装置Ａの切削部１ａを直接接地しての旋回作業車による溝の掘削作業を示す平面図である。
【図１１】排土装置Ａの切削部１ａを直接接地しての旋回作業車による溝の掘削作業を示す側面図である。
【図１２】保護部材１２・１２を取り付けた排土装置Ａの平面図である。
【図１３】同じく保護部材１２を接地状態とした場合の側面図である。
【図１４】同じく保護部材１２を収納状態とした場合の側面図である。
【符号の説明】
Ａ排土装置
Ｂ掘削作業腕
Ｍ掘削溝
１排土板
１ａ切削部
２フレーム
３Ａ補強部材
３Ｂ補強部材
４排土用シリンダー
５スペーサ
６走行フレーム
７履帯[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a soil removal device that pivotally supports a frame on a traveling device of a turning work vehicle or the like so that the frame can rotate vertically, and scrapes the soil surface with a soil removal plate provided at the end of the frame to perform a soil removal operation. Regarding the structure.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, for example, as shown in Japanese Patent Application Laid-Open No. 7-300876, it has been known that a traveling device (crawler traveling device) of a turning work vehicle or the like is provided with an earth removal device. The two base ends of the frame are pivotally supported by a traveling device or the like so as to be vertically rotatable, and a dump plate is straddled at the ends of both frames. And a telescopic actuator such as a hydraulic cylinder.
In such a structure, a circular pipe or a square pipe as a reinforcing member is conventionally provided laterally between a base end and a front end between both frames.
[0003]
[Problems to be solved by the invention]
First, since the reinforcing member laterally provided between the two frames is disposed immediately below the above-described discharging cylinder, the position where the upper end of the reinforcing member interferes with the discharging cylinder is the position of the discharging device. It becomes the upper rotation limit position. When this earth removal device is used for a track traveling type turning work vehicle, if the upper rotation limit position can be set high, the minimum ground clearance between both crawler belts can be set by setting the earth removal device to the upper rotation limit position. Can be expensive.
However, in the turning work vehicle for small turning, the height of the vehicle is reduced as much as possible because the rear portion of the main body is deleted and the balance of the center of gravity between the front and rear is deteriorated. Therefore, the position of the whole earth removal device is also lowered. On the other hand, in order to secure the minimum height above the ground at the time of the original vehicle height, it is necessary to increase the upper rotation limit position of the earth discharging device. However, this is hindered by interference between the reinforcing member and the earth discharging cylinder.
[0004]
In addition, since the diameter of the circular pipe material is increased in terms of strength, it becomes inevitably vertically elongated, so that the clearance between the cylinder and the discharging cylinder becomes smaller, and the interference position with the actuator during rotation of the discharging apparatus (rotation upper limit position). ) Is low, but if it is a square tube, the rectangular shape in cross section should be short and long to secure strength and widen the gap with the cylinder for earth removal. Can also be higher. However, there is a problem that the square pipe material tends to accumulate on it.
[0005]
[Means for Solving the Problems]
The present invention uses the following means to solve the above problems.
In the first aspect, the base ends of the horizontally arranged frames 2.2 are pivotally supported so as to be vertically rotatable, and the earth discharging plate 1 is laid over the leading ends of the two frames 2.2. And an earth-discharge cylinder 4 for connecting the earth-discharge plate 1 to the base-end portion. A reinforcing member 3A is provided laterally below the soil cylinder 4, the reinforcing member 3A is formed of a horizontally long elliptical pipe, and the reinforcing member 3A is provided within a width of the earth discharging cylinder 4 in the expansion and contraction direction. The upper limit rotation position H of the soil device A is increased .
[0006]
In the second aspect, the base ends of the horizontally arranged frames 2.2 are pivotally supported so as to be vertically rotatable, and the earth discharging plate 1 is straddled at the distal ends of the two frames 2.2. And a discharging cylinder 4 for connecting the discharging plate 1 to a portion near the base end between the two frames. A reinforcing member 3B is provided laterally below the earth cylinder 4, and the reinforcing member 3B is made of a circular pipe material. A concave portion 3Ba is provided on the side opposite to the earth discharging cylinder 4 so as to have a recessed portion 3Ba, and the reinforcing member 3B is provided within the width of the earth discharging cylinder 4 in the expansion and contraction direction. The movement upper limit H is increased .
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a turning work vehicle according to the present invention will be described.
FIG. 1 is an overall perspective view of a turning work vehicle equipped with an earth discharging device A according to the present invention,
FIG. 2 is a side view of an earth removal device A including a reinforcing member 3A,
FIG. 3 is a side cross-sectional view showing a comparison of each rotation upper limit position of the earth discharging device A including the reinforcing member 3A and the conventional earth discharging device A ′ including the reinforcing member 3 ′.
FIG. 4 is a cross-sectional side view showing a comparison of each rotation upper limit position of the earth discharging device A including the reinforcing member 3B and the earth discharging device A ′ including the conventional reinforcing member 3 ′.
FIG. 5 is a front view of the reinforcing member 3B,
FIG. 6 is a partial side view of the earth discharging device A in which the spacer 5 is attached to the cutting portion 1a,
FIGS. 7A and 7B are diagrams showing a digging operation of the digging groove by the turning work vehicle in which the spacer 5 is attached to the earth discharging device A in a case where the digging groove M is located at the center of the left and right sides of the vehicle body, and FIG. b) is a plan view,
FIGS. 8A and 8B are diagrams showing a trench excavation operation by the turning work vehicle in which the spacer 5 is attached to the earth discharging device A when the excavation trench M is located at the right end of the vehicle body, where FIG. 8A is a front view, and FIG. ) Is a plan view.
[0008]
In the present embodiment, as shown in FIG. 1, the earth discharging device A according to the present invention is employed in a turning work vehicle.
First, the schematic structure of the turning work vehicle is as follows. A main frame 8 is pivotally mounted on a running frame 6 around which crawler belts 7 are wound right and left, and a boom 9 and an arm 10 are provided at a front end of the main frame 8. , The excavation work arm B composed of the bucket 11 is supported. The turning work vehicle has a small turning specification such that the rear end of the main body frame 8 is formed in a circular shape so as not to protrude, so that the main body frame 8 does not protrude outside the crawler tracks 7.7 when turning. A hood 8a and the like are mounted on the main body frame 8 so as not to protrude from the crawler belts 7 during turning.
[0009]
The support structure of the earth discharging device A in the turning work vehicle will be described.
The left and right earth removal device brackets 6a, 6a and the cylinder bracket 6b protrude between the two crawler belts 7, 7 of the traveling frame 6, and both the earth removal device brackets 6a, 6a The base ends of the left and right frames 2 and 2 are pivotally supported so as to be vertically rotatable, and the distal end of a piston rod of a hydraulically driven discharging cylinder 4 is pivotally supported by the discharging cylinder 6b.
[0010]
The configuration of the discharging apparatus A will be described.
A soil discharge plate 1 is provided on both ends of the left and right frames 2 and 2 whose base ends are pivotally supported on the traveling frame 6 as described above. The end is pivoted. The reinforcing member 3A shown in FIG. 2 and FIG. 3 or the reinforcing member 3B shown in FIG. 4 and FIG.
Conventionally, for example, a reinforcing member 3 'made of a tubular material as shown in FIGS. On the other hand, first, the reinforcing member 3A has an elliptical shape having a minor axis in the vertical direction and a major axis in the lateral direction. This can be configured by vertically suppressing the circular pipe material used as the conventional reinforcing member 3 '.
Further, the reinforcing member 3B is configured such that an upper end portion (a portion abutting on the discharging cylinder 4) located directly below the discharging cylinder 4 in a circular pipe material such as a conventional reinforcing member 3 'is connected to the discharging cylinder 4. It is recessed on the opposite side and has a recessed portion 3Ba.
[0011]
In each of the reinforcing members 3A and 3B, the gap between the upper end thereof and the discharging cylinder 4 disposed thereabove is enlarged as compared with the conventional reinforcing member 3 '. As shown in FIG. 4, the rotation upper limit position H of the earth discharging device A where the reinforcing member 3A or 3B and the earth discharging cylinder 4 interfere with each other (this is a position relative to the pivot 2a at the base end of the frame 2). However, when the reinforcing member 3 ′ is used, it becomes higher than the rotation upper limit position H ′ of the discharging device A where the reinforcing member 3 ′ and the discharging cylinder 4 interfere with each other.
[0012]
Here, if the turning work vehicle supporting the discharging device A is of a type in which the rear portion of the main body frame 8 is not circular as shown in FIG. 1 and the conventional rear portion is bulged rearward, Since the center of gravity extends rearward, the vehicle height, that is, the height of the traveling frame 6 may be the same as before, and the minimum height above the ground between the crawler tracks 7 (if there is unevenness on the road surface, if the convex portion is up to this height, The rotation upper limit position of the earth discharging device A, which is the height that can pass between the crawler belts 7, 7), is also the height when the conventional reinforcing member 3 'is used (H' in FIGS. 3 and 4). Is sufficient.
However, in the turning work vehicle according to the present embodiment, as described above, because of the small turning specification, the rear portion of the main body frame 8 does not protrude, and the center of gravity tends to be biased to the front where the excavation work arm B is supported. In order to compensate for this, the traveling frame 6 is lowered to lower the vehicle height. Accordingly, since the positions of the brackets 6a and 6b are also lowered, the entire discharging apparatus A including the discharging cylinder 4 is also lowered. In this case, at the rotation upper limit position H 'of the earth discharging device A using the conventional reinforcing member 3', the minimum height above the ground is lowered.
[0013]
In this case, in the case of the earth discharging device A having the reinforcing members 3A and 3B, the rotation upper limit position H is higher than the rotation upper limit position H 'of the conventional earth discharging device A having the reinforcing member 3'. As a result, as a result, the same rotation upper limit position H 'and ground clearance of the earth discharging device A using the conventional reinforcing member 3' can be secured. That is, the minimum ground clearance between the crawler tracks 7, 7 can be maintained at the same level as in the past, despite the lowered vehicle height.
[0014]
In addition, the gap between the discharging cylinder 4 and the reinforcing member can be expanded by forming the reinforcing member with a square pipe material having a short length, but there is a problem that sediment accumulates. In this regard, the reinforcing members 3A and 3B are also formed by suppressing the circular pipe material and have a curved surface, so that the earth and sand does not slide down and accumulate on the reinforcing members.
[0015]
Next, the spacer 5 attached to the cutting portion 1a of the earth discharging plate 1 will be described .
It is known that a cutting portion is provided at the lower edge of the earth removal plate so that the earth removal plate can be reliably inserted into the earth and sand during earth removal.
Here, a case where the excavation work of the groove is performed by the turning work vehicle equipped with the earth removal device will be described with reference to FIGS. 9 to 11.
FIG. 9 is a plan view showing a trench excavation operation by the turning work vehicle with the cutting part 1a of the earth removal device A directly grounded when the excavation groove M is located at the left and right central part of the vehicle body, and FIG. FIG. 11 is a plan view showing an excavation work of a groove by a turning work vehicle in which M is located at the right end of the vehicle body, and a turning part of the earth removal device A directly grounds the cutting part 1a. It is a side view which shows the digging | excavation operation | work of the groove | channel by the turning work vehicle which touches directly.
[0016]
At the time of the excavation work of the groove, the excavation work arm B is inserted into the excavation groove M, and the earth discharging device A is positioned in front of the excavation groove M unless the earth discharging operation inside the excavation groove M is performed. At this time, as shown in FIG. 11, the cutting portion 1a at the lower edge of the earth removal plate 1 is brought into contact with the road surface so that the vehicle body does not swing back and forth during the work. Since the groove is dug in the direction of pulling the working arm A toward the front side, the vehicle body is moved backward. At this time, the lower end of the cutting portion 1a rubs the road surface, as shown in FIGS. 9 and 10. There is a risk of making a severe scratch K.
If the road surface is damaged K as described above, if the trench is excavated, there is no problem with the portion that overlaps with the excavation trench M. However, the width of the dumping plate 1 is larger than the width of the excavation trench M. Since it is long, a road surface scratch K remains in a place where the excavation groove M is not drilled.
[0017]
As a structure for preventing the road surface from being damaged by direct contact of the earth removal plate (cutting portion), as shown in FIGS. 12 to 14, the left and right sides of the earth removal plate 1 (positions in front of the crawlers 7, 7) ) Is provided with protection members 12 that can be turned up and down.
12 is a plan view of the earth discharging apparatus A to which the protection members 12 are attached, FIG. 13 is a side view when the protection member 12 is grounded, and FIG. 14 is a state where the protection member 12 is stored. It is a side view in the case.
[0018]
Regarding the structure for preventing the road surface from being damaged by the earth removal plate, when using any of the protection members disclosed in the above-mentioned prior art, when digging a groove, the vehicle body is moved while the protection member is grounded. However, at this time, the protective member also rubs against the road surface, so that it cannot be said that the road surface is not necessarily damaged.
In the mounting structure of each protection member described above, the mounting position is fixed to the left and right end positions of the earth discharging plate. Therefore, when the trench is dug, there is a possibility that the excavation trench does not always overlap with the road surface on which the protective member is grounded, and the damaged road surface is rubbed by the protective member.
Further, in the structure of the protection member 12, as shown in FIG. 14, there is a problem that the earth and sand S is caught between the protection member 12 and the crawler belt 7 at the time of storage.
[0019]
During normal earth removal work, the protection member 12 is raised and stored as shown in FIG. 14, so that the cut portion 1a of the earth removal plate 1 is brought into direct contact with the soil, and stable in the front-rear direction during excavation work or the like. When it is desired to ensure the performance, the protection member 12 is lowered and grounded as shown in FIG.
A structure similar to this is disclosed in Japanese Utility Model Laid-Open Publication No. 7-31960. In each case, at the left and right ends of the earth discharging plate, a protection member which can be freely moved between a retracted state and a grounded state, or is detachably provided. It has been established.
[0020]
Next, the spacer 5 attached to the lower edge of the discharge plate 1 will be described.
As shown in FIGS. 1 and 6, a cutting portion 1 a is fixed to the lower edge of the earth removal plate 1 over the entire width of the earth removal plate 1. In the earth discharging device A according to the present invention, as shown in FIG. 1, a plurality of screw holes 1b are formed over the entire width of the cutting portion 1a.
Then, the screw hole 1b is selected from these, and the spacer 5 can be screwed at an arbitrary position in the width direction of the cutting portion 1b as shown in FIGS.
[0021]
The width L1 of the spacer 5 is shorter than the width L2 of the excavation groove M. (Because the width L2 is always longer than the width of the bucket 11, the width L1 of the spacer 5 may be set to be shorter than the width of the bucket 11.) In the turning work vehicle of the present embodiment, the groove is used. 7 and 8, the spacer 5 is attached to an appropriate position of the cutting portion 1a of the earth discharging plate 1 in accordance with the position of the excavation groove M as shown in FIGS.
By doing so, the spacer 5 comes into contact with the ground on the road surface before the excavation groove M, while the width L2 of the spacer 5 is shorter than the width L1 of the excavation groove M on the road surface other than where the groove is excavated. Therefore, the cut portion 1a of the earth removal plate 1 is in a state of floating above the ground surface, and does not damage the road surface at a place off the excavation groove M.
When the vehicle body is moved by digging a groove, even if the road surface is rubbed and scratched (K ′ in FIGS. 7 and 8) with the spacer 5, the problem occurs because it overlaps with the digging groove M. Absent. Therefore, when the groove is excavated with the spacer 5 attached, the operation can be completed without damaging the road surface.
[0022]
With this configuration, the spacer can be attached to an arbitrary position in the width direction of the cutting portion of the lower edge of the earth discharging plate, so that the groove excavation work is performed by the turning work vehicle equipped with the earth discharging device. In this case, the spacer is mounted at a position in front of the excavation groove and grounded on the road surface. Since the spacer is narrower than the excavation groove, the groove is excavated even when the vehicle body is moved by excavation of the groove. In other places, the cutting portion is lifted off the road surface, and the road surface is not damaged.
Even if the road surface on which the spacer is grounded is damaged during the movement of the vehicle, the damage disappears because it overlaps with the excavation groove. Therefore, the excavation work of the groove can be performed without damaging the road surface at all.
Also, when the spacer is not required, it can be easily removed by removing the screw from the cutting part. Unlike the conventional protection members arranged on the left and right, there is only one, so it can be stored in an appropriate place on the vehicle body. However, unlike the related art, there is no problem that earth and sand are accumulated when the protection member is stored.
[0023]
【The invention's effect】
The present invention has the following effects by configuring the earth discharging device as described above.
That is, with the configuration as in claims 1 and 2, the gap between the reinforcing member and the earth discharging cylinder 4 is widened, and the rotation upper limit position of the earth discharging device has the conventional circular pipe reinforcing member. It is higher than the earth removal device.
Therefore, if this earth removal device is attached to a turning vehicle that needs to be lowered in order to increase the stability of the vehicle height in small turning specifications, the minimum height above the ground, that is, the convex part of the road surface that can avoid interference with the earth removal device Can be taken as before or higher than before, and the overall height of the turning vehicle can be made lower or as before so that stability can be increased.
[0024]
Further, the reinforcing member according to the first and second aspects can be constituted by compressing a circular pipe material or suppressing only a part of the circular pipe material, which is easy to process, and has a curved surface unlike a square pipe material. Therefore, the earth and sand do not slide down and accumulate on the reinforcing member.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a turning work vehicle provided with an earth discharging device A according to the present invention.
FIG. 2 is a side view of an earth discharging device A including a reinforcing member 3A.
FIG. 3 is a side cross-sectional view showing a comparison of each rotation upper limit position of an earth discharging device A including a reinforcing member 3A and a conventional earth discharging device A ′ including a reinforcing member 3 ′.
FIG. 4 is a side sectional view showing a comparison of each rotation upper limit position of an earth discharging device A including a reinforcing member 3B and a conventional earth discharging device A ′ including a reinforcing member 3 ′.
FIG. 5 is a front view of a reinforcing member 3B.
FIG. 6 is a partial side view of the earth discharging device A in which a spacer 5 is attached to the cutting portion 1a.
FIGS. 7A and 7B are diagrams showing an excavation operation of a trench by a turning work vehicle in which a spacer 5 is attached to an earth discharging device A when the excavation trench M is positioned at the center of the vehicle body in the left and right directions, where FIG. (B) is a plan view.
FIGS. 8A and 8B are diagrams showing an excavation operation of a groove by a turning work vehicle in which a spacer 5 is attached to an earth discharging device A when the excavation groove M is located at the right end of the vehicle body, and FIG. (b) is a plan view.
FIG. 9 is a plan view showing a groove excavation operation by the turning work vehicle with the cutting portion 1a of the earth discharging device A directly grounded when the excavation groove M is located at the left and right central portion of the vehicle body.
FIG. 10 is a plan view showing a digging operation of a turning work vehicle with the cutting portion 1a of the earth discharging device A directly grounded when the digging groove M is positioned at the right end of the vehicle body.
FIG. 11 is a side view showing a trench excavation operation performed by the turning work vehicle with the cutting portion 1a of the earth discharging device A directly grounded.
FIG. 12 is a plan view of an earth discharging device A to which protective members 12 are attached.
FIG. 13 is a side view when the protective member 12 is in a ground state.
FIG. 14 is a side view when the protection member 12 is in the housed state.
[Explanation of symbols]
Reference Signs List A earth removal device B excavation work arm M excavation groove 1 earth removal plate 1a cutting part 2 frame 3A reinforcement member 3B reinforcement member 4 earth removal cylinder 5 spacer 6 running frame 7 crawler track

Claims

左右並設状のフレーム２・２の基端を上下回動可能に枢支し、両フレーム２・２の先端に排土板１を跨設し、両フレーム２・２の間に基端寄り部分と排土板１とを連結する排土用シリンダー４を配設してなる排土装置において、該両フレーム２・２間の基端と先端の間で、該排土用シリンダー４の下方に補強部材３Ａを横設し、該補強部材３Ａを横長の楕円形状管にて構成し、該補強部材３Ａを排土用シリンダー４の伸縮方向の幅内に設け、排土装置Ａの回動上限位置Ｈを高くしたことを特徴とする排土装置。 The base ends of the horizontally arranged frames 2.2 are pivotally supported so as to be able to rotate up and down, and a soil discharge plate 1 is laid on the front ends of the two frames 2.2 so that the base end is closer to the base between the two frames 2.2. In an earth removal device provided with an earth discharging cylinder 4 for connecting the portion and the earth discharging plate 1, a lower part of the earth discharging cylinder 4 is provided between a base end and a front end between the two frames 2. 3A, the reinforcing member 3A is constituted by a horizontally long elliptical pipe, and the reinforcing member 3A is provided within the width of the discharging cylinder 4 in the expansion and contraction direction. An earth removal device wherein the upper limit position H is raised .

左右並設状のフレーム２・２の基端を上下回動可能に枢支し、両フレーム２・２の先端に排土板１を跨設し、両フレーム２・２の間に基端寄り部分と排土板１とを連結する排土用シリンダー４を配設してなる排土装置において、該両フレーム間２・２の基端と先端の間で、該排土用シリンダー４の下方に補強部材３Ｂを横設し、該補強部材３Ｂを円管材にて構成し、該円管材にて構成した補強部材３Ｂは、排土用シリンダー４との当接部分を、排土用シリンダー４と反対側に凹設して、凹設部３Ｂａを設けた形状とし、該補強部材３Ｂを排土用シリンダー４の伸縮方向の幅内に設け、排土装置Ａの回動上限位置Ｈを高くしたことを特徴とする排土装置。 The base ends of the horizontally arranged frames 2.2 are pivotally supported so as to be vertically rotatable, and the earth discharging plate 1 is laid on the front ends of the two frames 2.2 so as to be closer to the base end between the two frames 2.2. In an earth removal device provided with an earth discharging cylinder 4 for connecting the portion and the earth discharging plate 1, a lower part of the earth discharging cylinder 4 is provided between a base end and a front end of the two frames 2.2. The reinforcing member 3B is formed laterally, and the reinforcing member 3B is formed of a circular pipe material. The reinforcing member 3B is provided within the width of the discharging cylinder 4 in the expansion and contraction direction, and the rotation upper limit position H of the discharging device A is increased. Discharge device characterized by doing.