JPH0749667B2 - Hydraulic device for operation of parallel movement of attachment of agricultural loader - Google Patents
Hydraulic device for operation of parallel movement of attachment of agricultural loaderInfo
- Publication number
- JPH0749667B2 JPH0749667B2 JP3654287A JP3654287A JPH0749667B2 JP H0749667 B2 JPH0749667 B2 JP H0749667B2 JP 3654287 A JP3654287 A JP 3654287A JP 3654287 A JP3654287 A JP 3654287A JP H0749667 B2 JPH0749667 B2 JP H0749667B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- parallel movement
- lift
- valve
- dump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/36—Component parts
- E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
- E02F3/43—Control of dipper or bucket position; Control of sequence of drive operations
- E02F3/431—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like
- E02F3/432—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude
- E02F3/433—Control of dipper or bucket position; Control of sequence of drive operations for bucket-arms, front-end loaders, dumpers or the like for keeping the bucket in a predetermined position or attitude horizontal, e.g. self-levelling
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Lifting Devices For Agricultural Implements (AREA)
Description
【発明の詳細な説明】 〈産業上の利用分野〉 この発明は、トラクタに着脱可能に搭載される農用ロー
ダのアタッチメント(例えば、バケット、ヘイジカッ
タ、あるいは高所作業台等)を所要作業に応じて略水平
のまま、あるいは傾斜状態のまま平行移動操作させるた
めの油圧装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention provides an attachment (for example, a bucket, a haze cutter, or an aerial work platform) of an agricultural loader detachably mounted on a tractor according to required work. The present invention relates to a hydraulic device for performing a parallel movement operation in a substantially horizontal state or in an inclined state.
〈従来技術〉 この種の油圧操置としては、従来より多くの提案がなさ
れており、例えば第8図及び第9図に示すように特公昭
60-44457号公報には、本出願人の提案に係る油圧操置が
開示されている。<Prior Art> As this type of hydraulic operation, many proposals have been made in the past. For example, as shown in FIG. 8 and FIG.
Japanese Patent Laid-Open No. 60-44457 discloses a hydraulic operation proposed by the applicant.
それは農用ローダ1の油圧装置を構成する油圧ポンプ11
に対し、リフトシリンダ4をリフト操作弁12aで伸縮操
作可能に接続するとともに、ダンプシリンダ7をダンプ
操作弁13bで伸縮操作可能に接続し、リフトシリンダ4
に平行移動用シリンダ5を機械的に従動伸縮可能に付設
し、平行移動用シリンダ5をリフト操作弁12aに一体に
形成した平行移動操作用回路を介してダンプシリンダ7
に接続し、リフト操作弁12aの操作によりリフトシリン
ダ4を伸縮させてリフトアーム3を昇降駆動する状態に
おいては、これに従動して平行移動用シリンダ5が伸縮
してダンプシリンダ7を作動させてアタッチメント6を
揺動調節しながら平行移動させるアタッチメント自動平
行移動状態となるように構成されている。It is a hydraulic pump 11 that constitutes the hydraulic system of the agricultural loader 1.
On the other hand, the lift cylinder 4 is connected by the lift operation valve 12a so that it can be expanded and contracted, and the dump cylinder 7 is connected by the dump operation valve 13b so that it can be expanded and contracted.
A parallel movement cylinder 5 is attached to the mechanically driven expandable / contractible cylinder, and the parallel movement cylinder 5 is integrally formed with the lift operation valve 12a via a parallel movement operation circuit.
And the lift cylinder 3 is expanded and contracted by operating the lift operation valve 12a to drive the lift arm 3 up and down, the parallel movement cylinder 5 expands and contracts to operate the dump cylinder 7 in response to this. The attachment 6 is configured to be in an attachment automatic parallel movement state in which the attachment 6 is moved in parallel while adjusting the swing.
即ち、リフト操作弁12aは、平行上昇位置L、停止位置
M及び平行下昇位置Nに切換可能に構成されており、ア
タッチメント6が平行移動する平行上昇位置L及び平行
下降位置Nにあつては、平行移動用シリンダ5の油室5a
とダンプシリンダ7のすくい駆動側油室7bとを連通する
とともに、ダンプシリンダ7のダンプ駆動側油室7aとリ
フトシリンダ4の上昇駆動側油室4aとを連通するのに対
し、停止位置Mにあつては平行移動用シリンダ5の油室
5aとダンプシリンダ7のすくい駆動側油室7bとの連通を
遮断するとともに、ダンプ駆動側油室5aとリフトシリン
ダ4の上昇駆動側油室4aとの連通をも遮断するように構
成されている。That is, the lift operation valve 12a is configured to be switchable between the parallel rising position L, the stop position M, and the parallel lower rising position N. For the parallel rising position L and the parallel lowering position N where the attachment 6 moves in parallel, , Oil chamber 5a of translation cylinder 5
And the rake drive side oil chamber 7b of the dump cylinder 7 are communicated with each other, and the dump drive side oil chamber 7a of the dump cylinder 7 and the lift drive side oil chamber 4a of the lift cylinder 4 are communicated with each other. The oil chamber of the translation cylinder 5
The communication between 5a and the rake drive side oil chamber 7b of the dump cylinder 7 is cut off, and the communication between the dump drive side oil chamber 5a and the lift drive side oil chamber 4a of the lift cylinder 4 is also cut off. .
なお、これらの図において符号2はリリーフ弁であり、
25はタンクである。In these figures, reference numeral 2 is a relief valve,
25 is a tank.
〈発明が解決しようとする問題点〉 上記従来例のものは、リフト操作弁12aが平行移動操作
専用の3位置切換弁として構成されており、トラクター
が農用ローダの油圧装置として標準装備している3位置
切換弁をそのままリフト操作弁として使用することがで
きず、しかも、平行移動操作用回路を一体に組込んだ3
位置7接続弁を用いるため、その弁構造が複雑で、安価
に実施できない。<Problems to be Solved by the Invention> In the conventional example described above, the lift operation valve 12a is configured as a three-position switching valve dedicated to parallel movement operation, and the tractor is standardly equipped as a hydraulic device of an agricultural loader. The 3-position switching valve cannot be used as it is as a lift control valve, and the parallel movement control circuit is integrated in the 3 position control valve.
Since the position 7 connecting valve is used, the valve structure is complicated and cannot be implemented inexpensively.
また、アタッチメントの平行移動のために追加する弁装
置12aは小形にできないため、狭いスペースに設置する
には、その取付けや配管に多くの手間を必要とし、組付
けの作業能率を高めることができない。In addition, since the valve device 12a added for parallel movement of the attachment cannot be made small, it requires a lot of labor for its installation and piping to install it in a narrow space, and it is not possible to improve the work efficiency of assembly. .
しかも、リフト操作弁12aでリフトアーム3を昇降させ
ると、必ずアタッチメント6が平行移動するので、アタ
ッチメント6をリフトアームに姿勢固定したままリフト
駆動することができない。Moreover, when the lift arm 3 is moved up and down by the lift operation valve 12a, the attachment 6 always moves in parallel, so that the attachment 6 cannot be lift-driven with the posture fixed to the lift arm.
その上、リフト操作弁12aは、専用弁として追加装備さ
れるため、初めから操作し易い位置に設けるわけにはい
かず、操作性が悪い。Moreover, since the lift operation valve 12a is additionally equipped as a dedicated valve, it cannot be provided at a position where it can be easily operated from the beginning, resulting in poor operability.
〈問題点を解決するための手段〉 本発明は上記問題点を解決するためになされたもので、
前記従来のアタッチメント平行移動操作用油圧装置を次
のように改良したものである。<Means for Solving Problems> The present invention has been made to solve the above problems,
The conventional hydraulic device for parallel movement of attachment is improved as follows.
即ち、農用ローダ用油圧装置が標準装備しているリフト
操作弁12をそのまま用いるともに、そのリフト操作弁12
から独立させて平行移動操作用選択弁16を設ける。That is, the lift operating valve 12 that is standardly equipped with the hydraulic device for agricultural loaders is used as it is, and the lift operating valve 12 is also used.
A selection valve 16 for parallel movement operation is provided independently of the above.
この平行移動操作用選択弁16は平行移動操作位置Kと平
行移動休止位置Jとを備えて成り、この選択弁16の平行
移動操作位置Kは平行移動用シリンダ5の油室5aとダン
プシリンダ7のすくい駆動側油室7bとを連通するととも
に、ダンプシリンダ7のダンプ駆動側油室7aとリフトシ
リンダ4の上昇駆動側油室4aとを連通するのに対し、こ
の選択弁16の平行移動休止位置Jは、平行移動用シリン
ダ5の油室5aとダンプシリンダ7のすくい駆動側油室7b
との連通を遮断するとともに、ダンプ駆動側油室7aとリ
フトシリンダ4の上昇駆動側油室4aとの連通をも遮断す
るように構成したことを特徴とするものである。This parallel movement operation selection valve 16 comprises a parallel movement operation position K and a parallel movement rest position J, and the parallel movement operation position K of this selection valve 16 is the oil chamber 5a of the parallel movement cylinder 5 and the dump cylinder 7. While communicating with the scoop drive side oil chamber 7b and the dump drive side oil chamber 7a of the dump cylinder 7 and the ascending drive side oil chamber 4a of the lift cylinder 4, the parallel movement of the selection valve 16 is stopped. Position J is the oil chamber 5a of the translation cylinder 5 and the rake drive side oil chamber 7b of the dump cylinder 7.
It is characterized in that the communication between the dump drive side oil chamber 7a and the lift drive side oil chamber 4a of the lift cylinder 4 is also blocked.
〈作用〉 本発明では、農用ローダ用油圧装置が標準装備している
リフト操作弁12をそのまま用いるとともに、このリフト
操作弁12から独立させて平行移動操作用選択弁16を設
け、この選択弁16は基本的には平行移動操作位置Kと、
平行移動休止位置Jとを有する2位置切換弁からなり、
アタッチメント6を平行移動させるときには、この選択
弁16を平行移動操作位置Kに選択し、リフト操作弁12に
よりリフトアーム3を昇降させる。<Operation> In the present invention, the lift operation valve 12 that is standardly equipped in the hydraulic device for agricultural loaders is used as it is, and the parallel operation selection valve 16 is provided independently of the lift operation valve 12, and the selection valve 16 is provided. Is basically the translation operation position K,
A two-position switching valve having a parallel movement rest position J,
When the attachment 6 is moved in parallel, the selection valve 16 is selected at the parallel movement operation position K, and the lift operation valve 12 moves the lift arm 3 up and down.
また、アタッチメント6をリフトアーム3に姿勢固定し
た状態でリフト駆動するときは、上記選択弁16を平行移
動休止位置Jに選択してダンプシリンダ7の動きをブロ
ックし、リフト操作弁12によりリフトアーム3のみを昇
降させる。When the attachment 6 is lift-driven while the posture is fixed to the lift arm 3, the selection valve 16 is selected to the parallel movement rest position J to block the movement of the dump cylinder 7, and the lift operation valve 12 is used to lift the lift arm. Raise and lower only 3.
〈実施例〉 第1図及び第2図は、本発明の一実施例を示す油圧装置
の概要図で、第1図はアタッチメント6を平行上昇させ
るときの態様を示し、第2図は平行下降させるときの態
様を示す。<Embodiment> FIGS. 1 and 2 are schematic views of a hydraulic system showing an embodiment of the present invention. FIG. 1 shows a mode in which the attachment 6 is raised in parallel, and FIG. The mode at the time of making is shown.
これらの図において、符号1は農用ローダを示し、この
農用ローダ1は図外のトラクターに基台2を介して交換
可能に搭載され、基台2にその基端部を枢支して昇降揺
動可能に設けられたリフトアーム3と、リフトアーム3
を昇降揺動する複動式のリフトシリンダ4と、リフトア
ーム3の昇降揺動に従動して伸縮する単動式の平行移動
用シリンダ5と、リフトアーム3の先端部に着脱自在に
枢支されたアタッチメント(バケット)6と、このアタ
ッチメント6を上下揺動する複動式のダンプシリンダ7
を具備している。In these drawings, reference numeral 1 denotes an agricultural loader, which is mounted on a tractor (not shown) so as to be replaceable via a base 2, and the base 2 is pivotally supported at its base end to move up and down. Lift arm 3 movably provided, and lift arm 3
A double-acting lift cylinder 4 that vertically swings, a single-acting parallel-moving cylinder 5 that expands and contracts in response to the vertical swing of the lift arm 3, and a pivotally detachable support at the tip of the lift arm 3. Attachment (bucket) 6 and double-acting dump cylinder 7 that swings the attachment 6 up and down
It is equipped with.
このアタッチメント平行移動操作用油圧装置は、上記農
用ローダの油圧装置が標準装備している油圧ポンプ11、
同じくリフト操作弁12及びダンプ操作弁13の他に補助弁
装置15を備えて成り、この補助弁装置15は本発明の特徴
部分である平行移動操作用選択弁16を具備している。The hydraulic device for parallel movement of the attachment is a hydraulic pump 11 that is standardly equipped with the hydraulic device of the agricultural loader.
Similarly, in addition to the lift operation valve 12 and the dump operation valve 13, an auxiliary valve device 15 is provided, and this auxiliary valve device 15 is provided with a parallel movement operation selection valve 16 which is a characteristic part of the present invention.
即ち、農用ローダ1の油圧装置を構成する油圧ポンプ11
に対し、リフトシリンダ4をリフト操作弁12で伸縮操作
可能に接続するとともに、ダンプシリンダ7をダンプ操
作弁13で伸縮操作可能に接続し、リフトシリンダ4に平
行移動用シリンダ5を機械的に従動伸縮可能に付設し、
平行移動用シリンダ5を平行移動操作用選択弁16を介し
てダンプシリンダ7に接続し、リフト操作弁12に操作に
よりリフトシリンダ4を伸縮させてリフトアーム3を昇
降駆動する状態においては、これに従動して平行移動用
シリンダ5が伸縮してダンプシリンダ7を作動させてア
タッチメント6を揺動調節しながら平行移動させるアタ
ッチメント自動平行移動状態となるように構成されてい
る。That is, the hydraulic pump 11 that constitutes the hydraulic device of the agricultural loader 1
On the other hand, the lift cylinder 4 is connected by the lift operation valve 12 so that it can be expanded and contracted, the dump cylinder 7 is connected by the dump operation valve 13 so that it can be expanded and contracted, and the translation cylinder 5 is mechanically driven by the lift cylinder 4. Attachable to expand and contract,
In the state where the parallel movement cylinder 5 is connected to the dump cylinder 7 through the parallel movement operation selection valve 16 and the lift operation valve 12 is operated to extend and contract the lift cylinder 4 to drive the lift arm 3 up and down. Following this, the parallel movement cylinder 5 expands and contracts to actuate the dump cylinder 7 to move the attachment 6 in parallel while adjusting the swing of the attachment 6 to be in an attachment automatic parallel movement state.
補助弁装置15は、リフト操作弁12から独立して構成さ
れ、平行移動用シリンダ5とダンプシリンダ7とを接続
する平行移動用油路8・9に介在させて設けられ、第1
図に示すように、汎用型の2位置切換弁から成る前記平
行移動操作用選択弁16を備えている。The auxiliary valve device 15 is configured independently of the lift operation valve 12 and is provided so as to intervene in the parallel movement oil passages 8 and 9 connecting the parallel movement cylinder 5 and the dump cylinder 7.
As shown in the figure, the parallel movement operation selection valve 16 which is a general-purpose two-position switching valve is provided.
この選択弁16は平行移動操作停止位置Jと平行移動操作
位置Kとを有し、選択弁操作スイッチ17で2位置切換制
御可能に構成されており、操作ハンドル27でリフト操作
弁12を操作しながら、適宜スイッチ17をオンすることに
より、アタッチメント6を平行移動することができるよ
うになつている。The selection valve 16 has a parallel movement operation stop position J and a parallel movement operation position K, and is configured so that two-position switching control can be performed with a selection valve operation switch 17, and the lift operation valve 12 is operated with an operation handle 27. However, by appropriately turning on the switch 17, the attachment 6 can be moved in parallel.
アタッチメント6を平行上昇させるには、第1図に示す
ようにダンプ操作弁13を中立位置Fにしたまま、リフト
操作弁12を上昇位置Aにするとともに、平行上昇させた
い任意の位置で操作スイッチ17をオンにする。すると選
択弁16は平行移動停止位置Jから平行移動操作位置Kに
切換えられ、平行移動用シリンダ5の油室5aとダンプシ
リンダ7のすくい駆動側油室7bとが連通するとともに、
ダンプシリンダ7のダンプ駆動側油室7aとリフトシリン
ダ4の上昇駆動側油室4aとが連通する。この状態ではポ
ンプ11からの圧油は、リフトシリンダ4の上昇駆動側油
室4aと、補助弁装置15の油路8bに流入し、リフトシリン
ダ4の下降側油室4bから流出した油はタンク25へ戻る。In order to raise the attachment 6 in parallel, the lift operation valve 12 is moved to the raised position A while the dump operation valve 13 is in the neutral position F as shown in FIG. Turn 17 on. Then, the selection valve 16 is switched from the parallel movement stop position J to the parallel movement operation position K, and the oil chamber 5a of the parallel movement cylinder 5 and the rake drive side oil chamber 7b of the dump cylinder 7 communicate with each other.
The dump drive side oil chamber 7a of the dump cylinder 7 and the lift drive side oil chamber 4a of the lift cylinder 4 communicate with each other. In this state, the pressure oil from the pump 11 flows into the ascending drive side oil chamber 4a of the lift cylinder 4 and the oil passage 8b of the auxiliary valve device 15, and the oil flowing out from the descending side oil chamber 4b of the lift cylinder 4 is stored in the tank. Return to 25.
油路8bに流入した圧油は選択弁16を介してダンプシリン
ダ7のダンプ駆動側油室7aに流入し、すくい駆動側油室
7bより流出した油は、選択弁16を経て平行移動用シリン
ダ5の油室5aへ流入する。The pressure oil that has flowed into the oil passage 8b flows into the dump drive side oil chamber 7a of the dump cylinder 7 via the selection valve 16, and the rake drive side oil chamber
The oil flowing out from 7b flows into the oil chamber 5a of the parallel movement cylinder 5 through the selection valve 16.
このとき、平行移動用シリンダ5の油室5a内は油で満さ
れているため、ダンプシリンダ7からの戻り油は、平行
移動用シリンダ5が伸長した分だけ油室5aに流入し、ダ
ンプシリンダ7はその分だけ伸長する。これによりアタ
ッチメント6は平行上昇する。なおダンプシリンダ7の
シリンダ断面積と平行移動用シリンダのロッド断面積と
はアタッチメント6の平行移動を維持するように適宜設
定されている。At this time, since the oil chamber 5a of the translation cylinder 5 is filled with oil, the return oil from the dump cylinder 7 flows into the oil chamber 5a by an amount corresponding to the extension of the translation cylinder 5 and the dump cylinder 5a. 7 is extended by that amount. This causes the attachment 6 to rise in parallel. The cylinder cross-sectional area of the dump cylinder 7 and the rod cross-sectional area of the parallel movement cylinder are appropriately set so as to maintain the parallel movement of the attachment 6.
アタッチメント6を平行下降させるには第2図に示すよ
うに、ダンプ操作弁13を中立位置Fにしたまま、リフト
操作弁12を下降位置Cにするとともに、平行上昇させた
い任意の位置で操作スイッチ17をオンにする。すると上
記とは逆に油が流れ、アタッチメント6が平行下降す
る。In order to lower the attachment 6 in parallel, as shown in FIG. 2, the lift control valve 12 is moved to the lowered position C while the dump control valve 13 is kept in the neutral position F, and the operation switch is moved to any position desired to be raised in parallel. Turn 17 on. Then, contrary to the above, oil flows, and the attachment 6 descends in parallel.
また、アタッチメント6の平行移動を必要としない場合
にはいつでも操作スイッチ17をオフにしてアタッチメン
ト6の平行移動を停止させて、リフトアームのみを昇降
させることもできる。Further, when the parallel movement of the attachment 6 is not required, the operation switch 17 can be turned off at any time to stop the parallel movement of the attachment 6, and only the lift arm can be moved up and down.
なお、第1図及び第2図において上記平行移動操作用回
路15はリリーフ弁19、逆止弁20・21、パイロット弁22を
付設して成り、以下に説明する諸機能を併有する。1 and 2, the parallel movement operating circuit 15 is provided with a relief valve 19, check valves 20 and 21, and a pilot valve 22, and has the functions described below.
リリーフ弁19は、アタッチメント6が平行下降するとき
(第2図)、ダンプシリンダ7が最も収縮した場合に、
平行移動用シリンダ5の油の逃げ場がなくなるので、こ
のリリーフ弁19を介してタンク25へ油を戻すためのもの
である。The relief valve 19 is provided when the attachment cylinder 6 descends in parallel (FIG. 2) and the dump cylinder 7 contracts most.
This is for returning the oil to the tank 25 via the relief valve 19 because there is no escape place for the oil in the translation cylinder 5.
逆止弁20は、アタッチメント6が平行上昇するとき(第
1図)、ダンプシリンダ7が最も伸長した場合に、平行
移動用シリンダ5の油室5aが真空状態になるので、この
逆止弁20を介して油を当該駆動油室5aへ送るためのもの
である。The check valve 20 has a structure in which the oil chamber 5a of the parallel movement cylinder 5 is in a vacuum state when the attachment cylinder 6 rises in parallel (FIG. 1) and the dump cylinder 7 is most extended. It is for sending oil to the drive oil chamber 5a via the.
逆止弁21及びパイロット弁22は、例えば第2図におい
て、スイッチ17をオンにした状態で、リフト操作弁12を
中立位置Bに、ダンプ操作弁13をすくい位置Eに切換え
てアタッチメント6をすくい操作する場合に、リフトシ
リンダ4の上昇駆動側油室4aが油路9bを介してダンプシ
リンダ7のダンプ駆動側油室7aと連通するとともに、タ
ンク31へ通じて、リフトアーム3が自重で下降するのを
防止するためのものである。The check valve 21 and the pilot valve 22 are, for example, in FIG. 2, with the switch 17 turned on, the lift operating valve 12 is switched to the neutral position B and the dump operating valve 13 is switched to the rake position E to scoop the attachment 6. When operating, the lift drive side oil chamber 4a of the lift cylinder 4 communicates with the dump drive side oil chamber 7a of the dump cylinder 7 via the oil passage 9b, and also communicates with the tank 31 to lower the lift arm 3 by its own weight. This is to prevent it.
即ち、パイロット弁22は油路9aのパイロット圧で油路9b
を閉じるようになつている。That is, the pilot valve 22 is driven by the pilot pressure of the oil passage 9a to the oil passage 9b.
To close.
第3図は選択弁の別実施例を示す要部回路図を示し、こ
の選択弁16Aは平行移動停止位置Jにおいて、油路8aを
中立ポート8cで迂回させ油路8bに連通させた点が前記の
ものと異なる。FIG. 3 is a circuit diagram of a main part showing another embodiment of the selection valve. This selection valve 16A has a point that the oil passage 8a is bypassed by the neutral port 8c and communicated with the oil passage 8b at the parallel movement stop position J. Different from the above.
第4図は、選択弁16Bを5ポート3位置切換弁で構成し
た別実施例を示し、この選択弁16Bはダンプシリンダ7
のダンプ操作を増速させるための増速弁機構を付設した
点が第1図のものと異なる。FIG. 4 shows another embodiment in which the selection valve 16B is a 5-port 3-position switching valve. The selection valve 16B is a dump cylinder 7
1 in that a speed increasing valve mechanism for increasing the speed of the dumping operation is additionally provided.
例えばリフト操作弁12を中立位置Bに、ダンプ操作弁13
をダンプ操作位置Gに切換えて、ダンプ操作ハンドル28
の増速スイッチ18をオンにすると、選択弁16Bは、増速
位置Hとなり、ダンプシリンダ7のすくい駆動側油室7b
の戻り油は選択弁16Bを介して、ダンプシリンダ7のダ
ンプ駆動側油室7aに合流し、ダンプシリンダ7のダンプ
速度を速める。For example, the lift operation valve 12 is set to the neutral position B, the dump operation valve 13
To the dump operation position G, and the dump operation handle 28
When the speed increasing switch 18 is turned on, the selection valve 16B is set to the speed increasing position H, and the rake drive side oil chamber 7b of the dump cylinder 7 is turned on.
The return oil of (1) joins the dump drive side oil chamber 7a of the dump cylinder 7 via the selection valve 16B, and the dump speed of the dump cylinder 7 is increased.
第5図は、複動式リフトシリンダ4と単動式平行移動用
シリンダ5とを一体に組付けて構成した別実施例を示
し、その他の点は第1図と同じである。FIG. 5 shows another embodiment in which a double-acting lift cylinder 4 and a single-acting parallel moving cylinder 5 are integrally assembled, and other points are the same as in FIG.
第6図は、リフトシリンダ4を単動式のもので構成した
別実施例を示し、これに対応させてリフト操作弁12Aの
回路を一部変更しているが、その他の点は第1図と同じ
である。FIG. 6 shows another embodiment in which the lift cylinder 4 is configured by a single-acting type, and the circuit of the lift operation valve 12A is partially changed correspondingly, but other points are shown in FIG. Is the same as.
第7図は単動式リフトシリンダ4と、単動式平行移動用
シリンダ5とを一体に組付けて構成した別実施例を示
し、その他の点は第6図のものと同じである。FIG. 7 shows another embodiment in which the single-acting lift cylinder 4 and the single-acting parallel movement cylinder 5 are integrally assembled, and other points are the same as those in FIG.
〈発明の効果〉 本発明は上記のように構成され、作用することから、次
の効果を奏する。<Effects of the Invention> The present invention has the following effects because it is configured and operates as described above.
イ.農用ローダの油圧装置の基本構造において、リフト
アームの昇降駆動に伴つてアタッチメントを平行移動さ
せるために追加する弁装置として、第8図・第9図に示
す従来例ではリフト操作弁と平行移動操作用回路とを一
体に組合せた3位置7接続弁を用い、その弁構造が複雑
であつたのに対し、本発明では基本的には2位置4接続
の平行移動操作用選択弁を用いるだけなので、その弁構
造が簡単で安価に実施できる。I. In the basic structure of the hydraulic system of the agricultural loader, as a valve device added to move the attachment in parallel with the lifting drive of the lift arm, in the conventional example shown in FIG. 8 and FIG. The 3-position 7-connection valve integrally combined with the operation circuit was used, and the valve structure was complicated, whereas the present invention basically uses only the 2-position 4-connection parallel movement operation selection valve. The valve structure is simple and can be implemented at low cost.
ロ.アタッチメントの平行移動のために追加する弁装置
は、本発明では基本的には2位置4接続の構造の簡単な
弁で済むから、従来例の3位置7接続の複雑な弁と比べ
て、弁を小形にできるうえ、配管接続本数も少なくでき
るので、その弁を狭いスペースにでもゆとりをもつて設
置できるうえ、その取付けや配管の手間が少なくてす
み、組付けの作業能率を高めることができる。B. The valve device added for the parallel movement of the attachment is basically a simple valve having a 2-position 4-connection structure in the present invention. Since the valve can be made compact and the number of pipe connections can be reduced, the valve can be installed in a narrow space with a margin, and the installation and piping work can be reduced, improving the work efficiency of assembly. .
ハ.平行移動操作用選択弁を平行移動休止位置に投入し
た状態でリフト操作弁を操作することにより、リフトシ
リンダのみを作動させて、アタッチメントをリフトアー
ムに姿勢固定したままリフト駆動することができる。C. By operating the lift operation valve in a state where the parallel movement operation selection valve is placed in the parallel movement rest position, it is possible to operate only the lift cylinder and drive the lift while the posture of the attachment is fixed to the lift arm.
ニ.リフト操作弁は、トラクタが操作し易い位置に初め
から標準装備している3位置方向切換弁をそのまま使用
するので、楽に能率良く操縦することができる。D. As the lift operation valve, the 3-position directional control valve, which is standard equipment from the beginning, is used as it is at a position where the tractor is easy to operate, so that the tractor can be operated easily and efficiently.
第1図及び第2図は、それぞれ本発明の実施例に係る油
圧装置の油圧回路図であり、第1図は平行上昇時を、第
2図は平行下降時の態様を示す。第3図は選択弁の別実
施例を示す要部回路図、第4図はさらに別の選択弁を備
える油圧回路図、第5図は複動式リフトシリンダと単動
式平行移動用シリンダとを一対に組付けた別実施例によ
る回路図、第6図はリフトシリンダ及び平行移動用シリ
ンダを単動式のもので構成した別実施例による回路図、
第7図はリフトシリンダ及び平行移動用シリンダをそれ
ぞれ単動式のもので、一体に組付けて構成した別実施例
による回路図である。 第8図及び第9図はそれぞれ従来例を示す油圧回路図で
あり、第8図は平行上昇時、第9図は平行下降時の態様
を示す。 1……農用ローダ、3……リフトアーム、4……リフト
シリンダ、4a……上昇駆動側油室、5……平行移動用シ
リンダ、5a……油室、7……ダンプシリンダ、7a……ダ
ンプ駆動側油室、7b……すくい駆動側油室、8(8a・8
b)・9(9a・9b)……油路、11……ポンプ、12……リ
フト操作弁、13……ダンプ操作弁、16……選択弁(平行
移動操作用回路)。1 and 2 are hydraulic circuit diagrams of a hydraulic system according to an embodiment of the present invention. FIG. 1 shows a parallel ascending state, and FIG. 2 shows a parallel descending mode. FIG. 3 is a circuit diagram of a main part showing another embodiment of the selection valve, FIG. 4 is a hydraulic circuit diagram including another selection valve, and FIG. 5 is a double-acting lift cylinder and a single-acting parallel moving cylinder. FIG. 6 is a circuit diagram according to another embodiment in which the above are assembled in a pair, and FIG. 6 is a circuit diagram according to another embodiment in which the lift cylinder and the parallel movement cylinder are configured by a single-acting type.
FIG. 7 is a circuit diagram of another embodiment in which the lift cylinder and the parallel movement cylinder are single-acting type and are integrally assembled. FIG. 8 and FIG. 9 are hydraulic circuit diagrams showing a conventional example, respectively. FIG. 8 shows a mode during parallel rising, and FIG. 9 shows a mode during parallel falling. 1 ... agricultural loader, 3 ... lift arm, 4 ... lift cylinder, 4a ... ascending drive side oil chamber, 5 ... translation cylinder, 5a ... oil chamber, 7 ... dump cylinder, 7a ... Dump drive side oil chamber, 7b …… Scoop drive side oil chamber, 8 (8a ・ 8
b) ・ 9 (9a ・ 9b) …… Oil passage, 11 …… Pump, 12 …… Lift operation valve, 13 …… Dump operation valve, 16 …… Selection valve (parallel movement operation circuit).
Claims (1)
ンプ11に対し、リフトシリンダ4をリフト操作弁12で伸
縮操作可能に接続するとともに、ダンプシリンダ7をダ
ンプ操作弁13で伸縮操作可能に接続し、リフトシリンダ
4に平行移動用シリンダ5を機械的に従動伸縮可能に付
設し、平行移動用シリンダ5を平行移動操作用回路を介
してダンプシリンダ7に接続し、リフト操作弁12の操作
によりリフトシリンダ4を伸縮させてリフトアーム3を
昇降駆動する状態においては、これに従動して平行移動
用シリンダ5が伸縮してダンプシリンダ7を作動させて
アタッチメント6を揺動調節しながら平行移動させるア
タッチメント自動平行移動状態となるように構成した農
用ローダのアタッチメント平行移動操作用油圧装置にお
いて、 前記平行移動操作用回路は、リフト操作弁12から独立し
た平行移動操作用選択弁16で構成するとともに、この選
択弁16は平行移動操作位置Kと平行移動休止位置Jとを
備えて成り、 この選択弁16の平行移動操作位置Kは平行移動用シリン
ダ5の油室5aとダンプシリンダ7のすくい駆動側油室7b
とを連通するとともに、ダンプシリンダ7のダンプ駆動
側油室7aとリフトシリンダ4の上昇駆動側油室4aとを連
通するのに対し、 この選択弁16の平行移動休止位置Jは、平行移動用シリ
ンダ5の油室5aとダンプシリンダ7のすくい駆動側油室
7bとの連通を遮断するとともに、ダンプ駆動側油室7aと
リフトシリンダ4の上昇駆動側油室4aとの連通をも遮断
するように構成したことを特徴とする農用ローダのアタ
ッチメント平行移動操作用油圧装置1. A lift cylinder 4 is connected to a hydraulic pump 11 constituting a hydraulic device of an agricultural loader 1 so that it can be expanded and contracted by a lift operation valve 12, and a dump cylinder 7 can be expanded and contracted by a dump operation valve 13. The parallel movement cylinder 5 is attached to the lift cylinder 4 so as to be mechanically driven to expand and contract, and the parallel movement cylinder 5 is connected to the dump cylinder 7 through the parallel movement operation circuit to operate the lift operation valve 12. In the state where the lift cylinder 4 is expanded and contracted to drive the lift arm 3 up and down, the parallel movement cylinder 5 expands and contracts to operate the dump cylinder 7 and move the attachment 6 in parallel while adjusting the swing. In the hydraulic device for operating the attachment parallel movement of the agricultural loader, which is configured to be in the automatic parallel movement state of the attachment, The working circuit is composed of a parallel movement operation selection valve 16 independent of the lift operation valve 12, and this selection valve 16 is provided with a parallel movement operation position K and a parallel movement rest position J. The parallel movement operation position K is the oil chamber 5a of the parallel movement cylinder 5 and the rake drive side oil chamber 7b of the dump cylinder 7.
And the communication between the dump drive side oil chamber 7a of the dump cylinder 7 and the ascending drive side oil chamber 4a of the lift cylinder 4 while the parallel movement pause position J of the selection valve 16 is for parallel movement. Oil chamber 5a of cylinder 5 and rake drive side oil chamber of dump cylinder 7
For parallel movement operation of attachment of agricultural loader, characterized in that the communication with the dump drive side oil chamber 7a and the lift drive side oil chamber 4a of the lift cylinder 4 are also blocked. Hydraulic system
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3654287A JPH0749667B2 (en) | 1987-02-18 | 1987-02-18 | Hydraulic device for operation of parallel movement of attachment of agricultural loader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3654287A JPH0749667B2 (en) | 1987-02-18 | 1987-02-18 | Hydraulic device for operation of parallel movement of attachment of agricultural loader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS63206534A JPS63206534A (en) | 1988-08-25 |
JPH0749667B2 true JPH0749667B2 (en) | 1995-05-31 |
Family
ID=12472662
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3654287A Expired - Lifetime JPH0749667B2 (en) | 1987-02-18 | 1987-02-18 | Hydraulic device for operation of parallel movement of attachment of agricultural loader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0749667B2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014080812A (en) * | 2012-10-17 | 2014-05-08 | Sanyo Kiki Co Ltd | Hydraulic circuit of work machine |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5797310A (en) * | 1997-01-29 | 1998-08-25 | Eaton Corporation | Dual self level valve |
ITBO20000572A1 (en) * | 2000-10-03 | 2002-04-03 | New Holland Italia Spa | EARTH MOVING MACHINE |
AU2001294901A1 (en) * | 2000-10-03 | 2002-04-15 | Husco International, Inc. | Two-way, self-level valve |
AT17140U3 (en) * | 2021-02-23 | 2021-11-15 | Kaiser Ag | Walking excavator |
-
1987
- 1987-02-18 JP JP3654287A patent/JPH0749667B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014080812A (en) * | 2012-10-17 | 2014-05-08 | Sanyo Kiki Co Ltd | Hydraulic circuit of work machine |
Also Published As
Publication number | Publication date |
---|---|
JPS63206534A (en) | 1988-08-25 |
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