JPH025365B2 - - Google Patents
Info
- Publication number
- JPH025365B2 JPH025365B2 JP160783A JP160783A JPH025365B2 JP H025365 B2 JPH025365 B2 JP H025365B2 JP 160783 A JP160783 A JP 160783A JP 160783 A JP160783 A JP 160783A JP H025365 B2 JPH025365 B2 JP H025365B2
- Authority
- JP
- Japan
- Prior art keywords
- seedling planting
- planting device
- valve
- fluid pressure
- pressure cylinder
- 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
Links
- 239000012530 fluid Substances 0.000 claims description 24
- 241000209094 Oryza Species 0.000 claims description 10
- 235000007164 Oryza sativa Nutrition 0.000 claims description 10
- 235000009566 rice Nutrition 0.000 claims description 10
- 230000007935 neutral effect Effects 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Transplanting Machines (AREA)
Description
【発明の詳細な説明】
本発明は、苗植付装置を車体に対して昇降操作
する流体圧シリンダを設けた田植機における苗植
付装置昇降操作装置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for lifting and lowering a seedling planting device in a rice transplanter, which is provided with a fluid pressure cylinder that lifts and lowers the seedling planting device with respect to a vehicle body.
かかる昇降操作装置において、従来では、苗植
付装置がストロークエンドまで上昇されると、ポ
ンプからの流体をリリーフ弁により逃がすように
しているが、この場合、エンジン動力を不必要に
苗植付装置の上昇操作に消費する点に起因して、
枕地での走行及び旋回に際して、エンジン動力を
走行駆動のために効率良く使用できない不都合が
あつた。 Conventionally, in such a lifting operation device, when the seedling planting device is raised to the end of its stroke, fluid from the pump is released by a relief valve, but in this case, the engine power is not used unnecessarily to control the seedling planting device. Due to the point consumed in the rising operation of
When traveling and turning on a headland, there was a problem in that the engine power could not be used efficiently for driving the vehicle.
さらに詳述すれば、田植機では、枕地走行及び
旋回を行なうに際して苗植付装置を対地浮上させ
るように上昇操作することになり、そして、枕地
走行及び旋回時においては、操向操作、植付クラ
ツチの入切操作、及び、線引具の昇降操作等の各
種の操作を行なうため、一般に、流体圧シリンダ
の制御弁を上昇操作位置に操作し続けるようにし
て、上記各種の操作に集中することになり、その
結果、上記の如くポンプからの流体をリリーフ弁
にて逃がすものとなつていた。ところで、枕地で
の走行や旋回時においては、泥中に沈み込んで回
転する車輪の駆動のために大きな動力を要するも
のであり、しかも、田植機では車体の軽量化を図
り、且つ、無駄な燃料消費を抑制するために、一
般に小型で小出力のエンジンを搭載することが行
なわれており、上記の点に起因して、苗植付装置
上昇操作のために余分なエンジン動力を使用せず
に、エンジン動力を極力走行駆動のために有効に
使用したい要望があつた。 To be more specific, in the rice transplanter, when traveling on the headland and turning, the seedling planting device must be raised to float above the ground, and when traveling on the headland and turning, the rice transplanter must be operated by steering, In order to carry out various operations such as turning on and off the planting clutch and raising and lowering the wire pulling tool, the control valve of the fluid pressure cylinder is generally kept in the raising operation position to perform the various operations mentioned above. As a result, the fluid from the pump had to be released by the relief valve as described above. By the way, when driving on a headland or turning, a large amount of power is required to drive the wheels that sink into the mud and rotate. In order to reduce fuel consumption, a small and low-output engine is generally installed. There was a desire to use the engine power as effectively as possible for driving the vehicle without the need for a vehicle.
本発明は、上記実状に鑑みて為されたものであ
つて、その目的は、簡単な改造によつて、苗植付
装置上昇操作のために余分なエンジン動力を使用
することを抑制する点にある。 The present invention has been made in view of the above-mentioned circumstances, and its purpose is to suppress the use of extra engine power for raising the seedling planting device by simple modification. be.
本発明の特徴構成は、冒記田植機における苗植
付装置昇降操作装置において、前記流体圧シリン
ダが苗植付装置上昇側ストロークエンドに達した
時に流体圧ポンプからの流体を逃がすアンロード
弁を、前記シリンダの作動に伴つて自動的に開閉
操作されるように設けると共に、そのアンロード
弁の開き状態において、前記流体圧シリンダが苗
植付装置下降側へ作動することを阻止する逆止弁
を、前記アンロード弁の接続箇所よりも下手側流
路部分に設けた点にある。 A characteristic configuration of the present invention is that the seedling planting device lifting/lowering operation device in the rice transplanter described above includes an unload valve that releases fluid from the fluid pressure pump when the fluid pressure cylinder reaches the rising side stroke end of the seedling planting device. , a check valve that is provided to be automatically opened and closed in accordance with the operation of the cylinder, and that prevents the fluid pressure cylinder from operating in the downward direction of the seedling planting device when the unload valve is in the open state; is provided in a flow path portion downstream from the connection point of the unload valve.
次に、本発明特徴構成による作用効果を述べ
る。 Next, the effects of the characteristic configuration of the present invention will be described.
すなわち、流体圧シリンダが苗植付装置上昇側
ストロークエンドに達すれば、逆止弁によつて流
体圧シリンダが不測に苗植付装置下降側へ作動す
ることを阻止させた状態で、アンロード弁によつ
てポンプからの流体を逃すことができる。 In other words, when the fluid pressure cylinder reaches the end of the upward stroke of the seedling planting device, the check valve prevents the fluid pressure cylinder from unexpectedly moving toward the downward direction of the seedling planting device, and the unload valve is activated. allows fluid to escape from the pump.
従つて、流体圧シリンダが苗植付装置上昇側ス
トロークエンドに達した状態におけるポンプ駆動
のために消費するエンジン動力を減少させて、エ
ンジン動力を極力走行駆動のために使用できるの
であり、もつて、小型で小出力のエンジンを搭載
する場合においても、枕地での走行や旋回を良好
に行なわせることができる実用上の利点大な田植
機における苗植付装置昇降操作装置を得るに至つ
た。 Therefore, the engine power consumed for driving the pump when the hydraulic cylinder reaches the end of the upward stroke of the seedling planting device can be reduced, and the engine power can be used as much as possible for driving the vehicle. , even when equipped with a small and low-output engine, it has the practical advantage of being able to run and turn smoothly on headlands.A device for raising and lowering the seedling planting device in a rice transplanter has been developed. .
以下、本発明の実施例を図面に基づいて説明す
る。 Embodiments of the present invention will be described below based on the drawings.
第１図に示すように、向き変更操作自在な左右
前輪１、及び、左右後輪２を備え、且つ、運転席
３、及び、エンジン４を設けた乗用車体の後部
に、苗植付装置５をリンク機構６により昇降自在
に連結すると共に、苗植付装置昇降操作用の単動
型流体圧シリンダ７を、前記リンク機構６に作用
させる状態で設け、もつて、乗用型田植機を構成
してある。 As shown in FIG. 1, a seedling planting device 5 is installed at the rear of a passenger vehicle body that is equipped with left and right front wheels 1 and left and right rear wheels 2 that can be freely changed in direction, and is also provided with a driver's seat 3 and an engine 4. are connected by a link mechanism 6 so that they can be raised and lowered, and a single-acting hydraulic cylinder 7 for raising and lowering the seedling planting device is provided in a state where it acts on the link mechanism 6, thereby constructing a riding rice transplanter. There is.
第２図に示すように、流体圧ポンプ８をエンジ
ン４に連結すると共に、そのポンプ８と前記シリ
ンダ７とを接続する流路Ｒ中に、苗植付装置５の
下降速度を低速にするための絞り弁９を、逆止弁
１０と並列状態で介在させてある。そして、前記
シリンダ７に対する制御弁１１を構成するに、上
昇位置U1、中立位置N1、下降位置D1、及び、自
動昇降位置A1を備えた第１弁１１Ａと、上昇位
置U2、中立位置N2、下降位置D2、及び、自動昇
降位置A2を備えた第２弁１１Ｂとを、操作レバ
ー１２によつて同時操作されるように設け、もつ
て、上昇状態では、第１、第２弁１１Ａ，１１Ｂ
夫々が圧油をタンク１３に逃すことを阻止させ
て、シリンダ７を伸長作動させ、中立状態では、
第１弁１１Ａが圧油をタンク１３に逃して、シリ
ンダ７の作動を停止させ、下降状態では、第１、
第２弁１１Ａ，１１Ｂがともに圧油をタンク１３
に逃して、シリンダ７を短縮作動させ、さらに、
自動昇降状態では、第１弁１１Ａが圧油をタンク
１３に逃し、且つ、第２弁１１Ｂが圧油がタンク
１３に逃げることを阻止すると共に、第１弁１１
Ａの排油路ｒ中に設けた可変絞り弁１４の操作に
よつて、苗植付装置５を昇降操作できるようにし
てある。 As shown in FIG. 2, a fluid pressure pump 8 is connected to the engine 4, and a flow path R connecting the pump 8 and the cylinder 7 is provided in order to reduce the descending speed of the seedling planting device 5. A throttle valve 9 is interposed in parallel with the check valve 10. The control valve 11 for the cylinder 7 includes a first valve 11A having a raised position U 1 , a neutral position N 1 , a lowered position D 1 , and an automatic lifting position A 1 , and a raised position U 2 . A second valve 11B having a neutral position N 2 , a lowered position D 2 and an automatic raising/lowering position A 2 is provided so as to be operated simultaneously by the operation lever 12. , second valves 11A, 11B
Each prevents the pressure oil from escaping into the tank 13 and operates the cylinder 7 to extend, and in the neutral state,
The first valve 11A releases pressure oil to the tank 13 to stop the operation of the cylinder 7, and in the descending state, the first valve 11A
The second valves 11A and 11B both supply pressure oil to the tank 13.
, the cylinder 7 is operated for shortening, and further,
In the automatic lifting state, the first valve 11A releases the pressure oil to the tank 13, and the second valve 11B prevents the pressure oil from escaping to the tank 13.
By operating a variable throttle valve 14 provided in the oil drain path r of A, the seedling planting device 5 can be raised and lowered.
前記可変絞り弁１４の操作構造、つまり、自動
昇降操作構造について説明すれば、前記苗植付装
置５に後端側の横軸心Ｘ周りで上下揺動自在にフ
ロート１５を枢支すると共に、そのフロート１５
と苗植付装置５とを連動連結する屈伸リンク１６
を、フロート１５が上昇するほど前記絞り弁１４
を絞り側へ操作するようにワイヤ１７を介して絞
り弁１４に連動連結し、もつて、フロート前端部
の苗植付装置５に対する上下位置、つまり、植付
深さを設定範囲内に維持するように、苗植付装置
５を自動昇降させることができるように構成して
ある。 To explain the operating structure of the variable throttle valve 14, that is, the automatic lifting/lowering operating structure, a float 15 is pivotally supported on the seedling planting device 5 so as to be vertically swingable around the horizontal axis X on the rear end side. That float 15
and a bending link 16 that interlocks and connects the seedling planting device 5.
, as the float 15 rises, the throttle valve 14 increases.
is connected to the throttle valve 14 via a wire 17 so as to operate the float to the throttle side, thereby maintaining the vertical position of the front end of the float with respect to the seedling planting device 5, that is, the planting depth within a set range. The seedling planting device 5 is configured to be able to be raised and lowered automatically.
又、前記ポンプ８からの流体を逃すアンロード
弁１８を、それの操作用パイロツト圧流路を開閉
する２位置切換弁１８Ａが開かれると作用状態に
切換わるように設けると共に、前記切換弁１８Ａ
を、前記流体圧シリンダ７が苗植付装置上昇側ス
トロークエンドに達した時に閉じ付勢力に抗して
押圧開き操作されるように設け、さらに、前記ア
ンロード弁１８の開き状態において、前記流体圧
シリンダ７が苗植付装置下降側へ作動することを
阻止する逆止弁１９を、前記アンロード弁１８の
接続箇所よりも下手側流路部分に設け、もつて、
枕地での走行及び旋回を行なうに際して、制御弁
１１を上昇状態に操作し続けても、ポンプ駆動の
ためにエンジン動力が余分に消費されることを抑
制できるようにしてある。 Further, an unload valve 18 for releasing fluid from the pump 8 is provided so as to be switched to an operating state when a two-position switching valve 18A that opens and closes a pilot pressure passage for operating the unload valve 18 is opened, and the switching valve 18A
is provided so that the fluid pressure cylinder 7 is pressed open against the closing force when the seedling planting device reaches the upward stroke end, and further, when the unload valve 18 is in the open state, the fluid pressure cylinder 7 is opened. A check valve 19 that prevents the pressure cylinder 7 from operating in the downward direction of the seedling planting device is provided in a flow path portion downstream from the connection point of the unload valve 18,
Even when the control valve 11 is continuously operated in the ascending state when traveling and turning on a headland, it is possible to suppress unnecessary consumption of engine power to drive the pump.
但し、前記逆止弁１９は、制御弁１１における
第１弁１１Ａに第２弁１１Ｂとの間に位置する流
路部分に介在されており、昇降中立状態における
苗植付装置５の下降を阻止するための逆止弁に兼
用させてある。 However, the check valve 19 is interposed in a flow path portion located between the first valve 11A and the second valve 11B in the control valve 11, and prevents the seedling planting device 5 from descending in the vertical neutral state. It also serves as a check valve for
本発明を実施するに、アンロード弁１８を自動
的に開閉操作する構造は、例えば、アンロード弁
１８を電磁操作式に構成すると共に、流体圧シリ
ンダ７の上昇側ストロークエンドを検出するリミ
ツトスイツチの情報に基づいてアンロード弁１８
を通電操作させるようにする等、各種変更可能で
ある。 In carrying out the present invention, the structure for automatically opening and closing the unload valve 18 includes, for example, configuring the unload valve 18 to be electromagnetically operated, and using a limit switch that detects the upward stroke end of the fluid pressure cylinder 7. Based on the information unload valve 18
Various changes can be made, such as making it energized.
又、実施例では、単動型の流体圧シリンダ７を
備える場合について例示したが、本発明は複動型
の流体圧シリンダを備える場合にも適用でき、そ
して、シリンダ７に対する制御弁１１の具体構成
も各種変更できる。 Further, in the embodiment, a case where a single-acting type fluid pressure cylinder 7 is provided is illustrated, but the present invention can also be applied to a case where a double-acting type fluid pressure cylinder is provided. The configuration can also be changed in various ways.
図面は本発明に係る田植機における苗植付装置
昇降操作装置の実施例を例示し、第１図は乗用型
田植機を示す側面図、第２図は苗植付装置昇降操
作装置の具体構成を示す回路図である。
５……苗植付装置、７……流体圧シリンダ、８
……流体圧ポンプ、１８……アンロード弁、１９
……逆止弁。
The drawings illustrate an example of the lifting operation device for the seedling planting device in the rice transplanter according to the present invention, FIG. 1 is a side view showing a riding type rice transplanter, and FIG. 2 is a specific configuration of the lifting operation device for the seedling planting device. FIG. 5... Seedling planting device, 7... Fluid pressure cylinder, 8
...Fluid pressure pump, 18...Unload valve, 19
……non-return valve.
Claims (1)
体圧シリンダ７を設けた田植機における苗植付装
置昇降操作装置であつて、前記流体圧シリンダ７
が苗植付装置上昇側ストロークエンドに達した時
に流体圧ポンプ８からの流体を逃がすアンロード
弁１８を、前記シリンダ７の作動に伴つて自動的
に開閉操作されるように設けると共に、そのアン
ロード弁１８の開き状態において、前記流体圧シ
リンダ７が苗植付装置下降側へ作動することを阻
止する逆止弁１９を、前記アンロード弁１８の接
続箇所よりも下手側流路部分に設けてある田植機
における苗植付装置昇降操作装置。1 A seedling planting device lifting/lowering operation device in a rice transplanter equipped with a fluid pressure cylinder 7 for raising and lowering a seedling planting device 5 relative to a vehicle body, the said fluid pressure cylinder 7
An unload valve 18 is provided to release fluid from the hydraulic pump 8 when the seedling planting device reaches the upward stroke end, and is automatically opened and closed in accordance with the operation of the cylinder 7. A check valve 19 that prevents the fluid pressure cylinder 7 from operating in the downward direction of the seedling planting device when the load valve 18 is open is provided in a flow path portion downstream from the connection point of the unload valve 18. A device for lifting and lowering the seedling planting device in a rice transplanter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP160783A JPS59125808A (en) | 1983-01-07 | 1983-01-07 | Lift operation apparatus with seedling planter in rice planter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP160783A JPS59125808A (en) | 1983-01-07 | 1983-01-07 | Lift operation apparatus with seedling planter in rice planter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59125808A JPS59125808A (en) | 1984-07-20 |
| JPH025365B2 true JPH025365B2 (en) | 1990-02-01 |
Family
ID=11506181
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP160783A Granted JPS59125808A (en) | 1983-01-07 | 1983-01-07 | Lift operation apparatus with seedling planter in rice planter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59125808A (en) |
-
1983
- 1983-01-07 JP JP160783A patent/JPS59125808A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59125808A (en) | 1984-07-20 |
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