JPS6258913A - Hydraulic pressure change-over valve of hydraulic cylinder - Google Patents
Hydraulic pressure change-over valve of hydraulic cylinderInfo
- Publication number
- JPS6258913A JPS6258913A JP19835685A JP19835685A JPS6258913A JP S6258913 A JPS6258913 A JP S6258913A JP 19835685 A JP19835685 A JP 19835685A JP 19835685 A JP19835685 A JP 19835685A JP S6258913 A JPS6258913 A JP S6258913A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- hydraulic
- valve
- sent
- switching
- 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.)
- Pending
Links
Landscapes
- Transplanting Machines (AREA)
- Servomotors (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、油圧シリンダの油圧切替バルブに関するも
ので、苗植機や播種機等の走行車輪の昇降回動用の油圧
装置として利用できる。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a hydraulic switching valve for a hydraulic cylinder, and can be used as a hydraulic device for lifting and lowering rotation of running wheels of seedling planting machines, seeding machines, etc.
従来の技術
従来の1竹植機は、走行車体の左右両側に設けた走行車
輪の昇降用に使用する油圧回路のバルブ室内に設けたバ
ルブの回動作動により油圧ポンプから逆流防止弁を介し
て油圧シリンダ内へ送油する送油行程、この油圧シリン
ダ内の油を油タンクへ排油する排油行程、該油圧ポンプ
から該油タンク内へ還流させる中立行程及び該送油行程
並びに排油行程において該油圧ポンプからの送油を遮断
する遮断行程、これら各行程に切替える切替通路を一個
有する油圧装置であった。Conventional technology A conventional single-bamboo transplanter uses the rotation of a valve installed in the valve chamber of the hydraulic circuit used to raise and lower the wheels on both the left and right sides of the vehicle, allowing water to flow from the hydraulic pump through the anti-return valve. An oil feeding process that sends oil into the hydraulic cylinder, an oil draining process that drains the oil in the hydraulic cylinder to the oil tank, a neutral process that returns the oil from the hydraulic pump to the oil tank, the oil feeding process, and the oil draining process. This hydraulic system has a shutoff stroke for shutting off oil supply from the hydraulic pump, and one switching passage for switching to each of these strokes.
発明が解決しようとする問題点
例えば、苗植機では苗挿植作業中は、土壌深さによって
該苗植機の走行車体の左右両側に設けた走行車輪は、こ
の土壌深さを検出フロートが検出してこの検出により、
この検出フロートとiJl 接した左右両側の油圧回路
のバルブ室内のバルブの回動作動により、該走行車輪を
個別に上昇又は下降させて、該走行車体が土壌面に対し
てほぼ一定位置に保持して苗挿植する苗植機においては
、土壌の深さが浅くなって、第9図の如くバルブの回動
作動により、油圧シリンダ内へ油圧ポンプより送油する
送油行程において、このバルブの回動作動のタイミング
のずれが発生すると、該油圧シリンダ内の油が油タンク
内へ排油されることがあり、このような状態になると左
右両側の該走行車輪の上下位置が異なり、該走行車体が
傾向き所定のW挿植深さに苗挿植ができなくなることが
ある。Problems to be Solved by the Invention For example, in a seedling transplanter, during seedling cutting work, depending on the soil depth, the running wheels provided on both the left and right sides of the running body of the seedling transplanter have a float that detects this soil depth. Detect and with this detection,
By the rotational movement of the valves in the valve chambers of the left and right hydraulic circuits in contact with this detection float, the traveling wheels are individually raised or lowered, and the traveling vehicle body is maintained at a substantially constant position relative to the soil surface. In a seedling planting machine that inserts seedlings into a hydraulic cylinder, the depth of the soil becomes shallow, and as shown in Fig. 9, the rotation of the valve causes oil to be pumped into the hydraulic cylinder from the hydraulic pump. If a timing shift occurs in the rotational movement, the oil in the hydraulic cylinder may be drained into the oil tank. In such a situation, the vertical positions of the left and right running wheels will be different, causing the running The vehicle body may tilt and seedlings may not be planted at the specified W planting depth.
問題点を解決するための手段
この発明は、油圧回路(1)のバルブ室(2)内におい
て回動自在に設けられるバルブ(3)の軸方向に沿って
位置を異にして下記A、Bを設けてなる油圧シリンダの
油圧切替バルブ。Means for Solving the Problems The present invention provides the following A and B by changing the position along the axial direction of a valve (3) rotatably provided in a valve chamber (2) of a hydraulic circuit (1). A hydraulic switching valve for a hydraulic cylinder.
A、油圧ポンプ(4)から逆流防止弁(5)を介して油
圧シリンダ(6)へ送油する送油行程と、この油圧シリ
ンダ(6)内の油を油タンク(7)へ排油する排油行程
とに切替える油圧切替通路(8)。A. Oil feeding process in which oil is sent from the hydraulic pump (4) to the hydraulic cylinder (6) via the check valve (5), and the oil in this hydraulic cylinder (6) is drained to the oil tank (7). A hydraulic switching passage (8) for switching to an oil drain stroke.
B、該油圧ポンプ(4)の送油を該油タンク(7)へ還
流される中立行程と、該送油行程並びに該排油行程にお
いて該油圧ポンプ(4)の送油を遮断する遮断行程とに
切替える中立切替通路(9)の構成とする。B. A neutral stroke in which the oil sent by the hydraulic pump (4) is returned to the oil tank (7), and a cutoff stroke in which the oil sent by the hydraulic pump (4) is cut off during the oil feeding stroke and the oil draining stroke. The configuration includes a neutral switching path (9) that switches between
発明の作用
苗植機で苗挿植作業中は、土壌表土面を左右両側の検出
フロートが接地滑走しながら、この走行土壌面との滑走
による上下動によって土壌深さを検出し、この検出によ
り該谷検出フロートに連接する各油圧回路(1)のバル
ブ室(2)内のバルブ(3)が回動作動して、例えば、
土壌深さが深いと該谷検出フロートは上動し、該各バル
ブ(3)が回動し、各油圧ポンプ(4)から油圧切替通
路(8)内の逆流防止弁(5)を経て各油圧シリンダ(
6)内へ送油され、走行車体の左右両側の走行車輪を下
降させて、該走行車体と土壌表面との関係位置をほぼ一
定位置に保持して苗挿植を行なう。Function of the Invention During seedling planting with a seedling transplanter, the detection floats on both the left and right sides slide on the surface of the soil, and the soil depth is detected by the vertical movement caused by sliding with the running soil surface. The valve (3) in the valve chamber (2) of each hydraulic circuit (1) connected to the valley detection float rotates, for example,
When the soil depth is deep, the valley detection float moves upward, and each valve (3) rotates, causing water to flow from each hydraulic pump (4) through the check valve (5) in the hydraulic switching passage (8). Hydraulic cylinder (
6) Oil is sent inside, the left and right running wheels of the running vehicle are lowered, and the relationship between the running vehicle and the soil surface is maintained at a substantially constant position, and seedlings are planted.
上記とは逆に土壌深さが浅いと該谷検出フロートは下動
して該各パルプ(3)が回動し、該各油圧シリンダ(6
)内の油は該油圧切替通路(8)を通って各袖タンク(
7)内へ排油され、該各走行車輪を上昇させて、該走行
車体と土壌表面との関係位置をほぼ一定位置に保持して
苗挿植を行なう。又該谷検出フロートの上下動が停止す
ると該各バルブ(3)が回動し、このバルブ(3)によ
り該油圧切替通路(8)は遮断され、該各油圧ポンプ(
4)より送油する油は中立切替通路(9)を通り該6油
タンク(7)内へ送油され、該各走行車輪の昇降は停止
する。又該各バルブ(3)が中立のときには、該各油圧
ポンプ(4)より送油する油は該各中立切替通路(9)
を通り該6油タンク(7)内へ還流する。Contrary to the above, when the soil depth is shallow, the valley detection float moves down, each pulp (3) rotates, and each hydraulic cylinder (6
) The oil in each sleeve tank (
7) The oil is drained into the container, each of the traveling wheels is raised, and the relative position between the traveling vehicle body and the soil surface is maintained at a substantially constant position, and seedlings are planted. Also, when the vertical movement of the valley detection float stops, each valve (3) rotates, and the hydraulic switching passage (8) is shut off by this valve (3), and each hydraulic pump (
4) The oil is fed into the six oil tanks (7) through the neutral switching passage (9), and the lifting and lowering of each of the traveling wheels is stopped. When each valve (3) is in the neutral position, the oil sent from each hydraulic pump (4) is transferred to each neutral switching passage (9).
and refluxes into the 6 oil tank (7).
発明の効果
この発明により、各走行車輪を上昇又は下降させるとき
は、各油圧ポンプ(4)より送油される油は各バルブ(
3)の回動作動により、各油圧切替通路(8)を通り各
油圧シリンダ(6)内へ送油され、該各油圧シリンダ(
6)内より各タンク(7)内へ排油され、又この送油行
程並びに排油行程において、該各油圧ポンプ(4)より
の送油を遮断する遮断行程及び該各油圧ポンプ(4)よ
りの送油を該6油タンク(7)内へ還流する中立行程の
ときには、各申立切替通路(9)を油が通って該6油タ
ンク(7)内へ送油されることにより、該左右のバルブ
(3)の回動作動のタイミングのずれが発生することが
ないので、走行車体が傾向くことがないため、常に所定
の深さに苗挿植ができる。Effects of the Invention According to this invention, when each traveling wheel is raised or lowered, the oil sent from each hydraulic pump (4) is pumped through each valve (
3), oil is sent into each hydraulic cylinder (6) through each hydraulic switching passage (8), and
6) into each tank (7), and during this oil feeding stroke and oil draining stroke, a shutoff stroke to shut off oil supply from each hydraulic pump (4) and each hydraulic pump (4). At the time of the neutral stroke in which the oil is returned to the six oil tanks (7), the oil passes through each application switching passage (9) and is fed into the six oil tanks (7). Since there is no difference in timing between the rotational movements of the left and right valves (3), the traveling vehicle body does not tilt, so seedlings can always be planted at a predetermined depth.
実施例
なお1図例において、苗植4!!(10)は走行車体(
11)前部には走行伝動ケース(12)を設け、この走
行伝動ケース(12)前部には原動機搭載台(13)を
設け、この原動機搭載台(13)上側には原動機(14
)を搭載し、該走行車体(11)後部には植付伝動ケー
ス(15)を設け、この植付伝動ケース(15)後部に
はハンドル(1B)を上下方向で後方へ傾斜する状態に
お設けて基部を該植付伝動ケ−ス(15)に固着した構
成である。Example In addition, in the example shown in 1, seedlings are planted 4! ! (10) is the running vehicle body (
11) A traveling transmission case (12) is provided at the front, a prime mover mounting stand (13) is provided at the front of this traveling transmission case (12), and a prime mover (14) is installed on the upper side of this prime mover mounting stand (13).
), a planting transmission case (15) is provided at the rear of the traveling vehicle body (11), and a handle (1B) is installed at the rear of the planting transmission case (15) in a state that tilts backward in the vertical direction. The base is fixed to the planting transmission case (15).
該走行伝動ケース(12)の左右両側には上部へ突出す
るアーム(17)部を有する車輪ケース(18)基部を
上下回動自在に枢着し、この車輪ケース(18)後端部
の外側には走行車輪(18)を連動すべく軸装している
。該植付伝動ケース(15)下部左右両側にはクランク
機構を介して上下揺動する苗挿植装置(20)を設け、
該ハンドル(IG)上側にはこのハンドル(16)に沿
わせて後傾状に配設し左右移動自在に支架した苗載台(
21)を設け、この苗載台(21)は該植付伝動ケース
(15)内に設けた往復動機構に移動杆及びアームを介
して連接した構成である。The base of a wheel case (18) having an arm (17) projecting upward is pivotally mounted on both left and right sides of the traveling transmission case (12) so as to be movable up and down. A running wheel (18) is mounted on the shaft for interlocking movement. A seedling transplanting device (20) that swings up and down via a crank mechanism is provided on both left and right sides of the lower part of the planting transmission case (15),
Above the handle (IG), there is a seedling stand (16) arranged in a backward-slanting manner along the handle (16) and supported so as to be movable from side to side.
21), and this seedling stand (21) is connected to a reciprocating mechanism provided in the planting transmission case (15) via a moving rod and an arm.
前記走行車体(11)下部の左右両側には検出フロート
(22)、(22)を配設し、中央部には整地フロート
(23)を配設し、前記走行伝動ケース(12)上側の
左右両側には油圧装置を設け、この油圧装置の油圧ポン
プ(4)より送油される油が通る油圧回路(1)は油圧
切替通路(8)と中立切電
替通路(9)とよりなり、この油圧切替車路(8)と中
立切替通路(9)とにはバルブ室(2)、(2)を設け
、このバルブ室(2)、(2)内を貫通する丸棒状のバ
ルブ(3)を設け、このノ(ルブ(3)の軸端部にはバ
ルブアーム(27)を固着し、該油圧切替通路(8)内
の始端側には逆流防市弁(5)を設け、該油圧切替通路
(8)の該バルブ室(2)部の該バルブ(3)の外周部
には切欠(24)を設け、又該中立切替通路(9)の該
バルブ室(2)部の該バルブ(3)の軸芯部には貫通孔
(25)及び外周部には切欠(26)を設けた構成であ
り、該検出フロート(22)後部は後部に設けた取付金
具を該走行車体(11)より横設した軸に回動自在に枢
支し、前部は前部に設けた取付金具(2B)と該バルブ
(3)に固着した該バルブアーム(27)との間を連結
ロッ) (29)で連接した構成であり、該整地フロー
) (23)後部は後部に設けた取付金具を前記ハンド
ル(16)より横設した軸に回動自在に枢支し、前部は
前部に設けた取付金具と該走行車体(11)より横設し
た軸との間にリンク機構で下方へ弾発する状態で上下回
動自在にリンクで枢支した構成である。Detection floats (22), (22) are arranged on the left and right sides of the lower part of the traveling vehicle body (11), a ground leveling float (23) is arranged in the center, and a A hydraulic system is provided on both sides, and a hydraulic circuit (1) through which oil is sent from a hydraulic pump (4) of this hydraulic system consists of a hydraulic pressure switching passage (8) and a neutral switching passage (9). Valve chambers (2), (2) are provided in the hydraulic switching lane (8) and the neutral switching path (9), and a round rod-shaped valve (3) passing through the valve chambers (2), (2) is provided. ), a valve arm (27) is fixed to the shaft end of the valve (3), and a backflow prevention valve (5) is provided at the starting end of the hydraulic pressure switching passage (8). A notch (24) is provided on the outer periphery of the valve (3) in the valve chamber (2) portion of the hydraulic pressure switching passage (8), and a notch (24) is provided in the outer circumference of the valve (3) in the valve chamber (2) portion of the neutral switching passage (9). The valve (3) has a through hole (25) in its axial center and a notch (26) in its outer periphery, and the rear part of the detection float (22) has a mounting bracket attached to the rear part of the vehicle body ( 11) The front part is rotatably supported on a horizontally installed shaft, and the front part has a connecting rod between the mounting bracket (2B) provided at the front part and the valve arm (27) fixed to the valve (3). ) (29), and the ground leveling flow) (23) At the rear, a mounting bracket provided at the rear is rotatably supported on a shaft installed laterally from the handle (16), and at the front, The structure is such that it is pivotally supported by a link mechanism between a mounting bracket provided on the part and a shaft installed laterally from the traveling vehicle body (11) so as to be able to move vertically in a downwardly resilient manner.
前記原動機搭載台(13)左右両側には油圧シリンダ(
6)及びピストン(30)を設け、このピストン(30
)と前記車輪ケース(18)のアーム(17)部とは連
接した構成であり、該検出フロート(22)が個別に上
動すると、連結ロッ) (29)及び該バルブアーム(
27)を介して該バルブ(3)が回動して、該油圧ポン
プ(4)より送油する油は該油圧切替通路(8)を通り
該逆波防止弁(5)、該バルブ室(2)内の該バルブ(
3)の切欠(24)を経て該油圧シリンダ(6)内へ送
油され、該ピストン(30)が突出しこのピストン(3
0)の突出により、該車輪ケース(18)は個別に下降
回動し、前記走行車輪(19)が下降する構成であり、
このときには該中立切替通路(9)の該バルブ室(2)
は該バルブ(3)で遮断されて該油圧ポンプ(4)より
送油する油は、この中立切替通路(9)へ送hi+され
ない構成である。Hydraulic cylinders (
6) and a piston (30), the piston (30
) and the arm (17) of the wheel case (18) are connected, and when the detection float (22) moves upward individually, the connecting rod (29) and the valve arm (
The valve (3) rotates via the hydraulic pump (4), and the oil sent from the hydraulic pump (4) passes through the hydraulic switching passage (8), the reverse wave prevention valve (5), and the valve chamber (27). 2) The valve in (
Oil is fed into the hydraulic cylinder (6) through the notch (24) in the piston (30), and the piston (30) protrudes.
0), the wheel case (18) individually rotates downward, and the traveling wheel (19) descends;
At this time, the valve chamber (2) of the neutral switching passage (9)
is shut off by the valve (3) so that the oil sent from the hydraulic pump (4) is not sent to the neutral switching passage (9).
上記とは逆に前記検出フロー) (22)が個別に下動
すると、前記連結ロッ) (29)及び前記バルブアー
ム(27)を介して前記バルブ(3)が回動して、前記
油圧シリンダ(6)内の油は前記油圧切替通路(8)の
前記バルブ室(2)内の該バルブ(3)の切欠(20を
経て前記油タンク(7)内へ排油され、該ピストン(3
0)が引込み前記車輪ケース(18)は該ピストン(3
0)の引込みにより、該車輪ケース(18)は個別に上
昇回動し、前記走行車輪(19)が上昇する構成であり
、このときは前記油圧ポンプ(4)より送油する油は前
記中立切替通路(9)のバルブ室(2)の該バルブ(3
)の前記切欠(26)を経て該油タンク(7)内へ送油
される構成である。Contrary to the above, when the detection flow (22) moves down individually, the valve (3) rotates via the connecting rod (29) and the valve arm (27), and the hydraulic cylinder (6) is drained into the oil tank (7) through the notch (20) of the valve (3) in the valve chamber (2) of the hydraulic pressure switching passage (8), and is drained into the oil tank (7).
0) is retracted and the wheel case (18) is retracted by the piston (3
0), the wheel cases (18) are individually rotated upwardly, and the traveling wheels (19) are raised. At this time, the oil sent from the hydraulic pump (4) is pumped from the neutral The valve (3) in the valve chamber (2) of the switching passage (9)
) The oil is fed into the oil tank (7) through the notch (26).
前記各検出フロー) (22)の上下動が停止すると、
前記各連結ロッ) (29)及び前記バルブアーム(2
7)を介して前記各バルブ(3)が回動し、前記各油圧
ポンプ(4)より送油する油は前記各中立切替通路(9
)の前記バルブ室(2)の該バルブ(3)に設けた前記
6孔(25)を経て前記各油タンク(7)へ送油される
構成であり、このときには前記各油圧切替通路(8)の
前記バルブ宝(2)は該各バルブ(3)で遮断されて、
該各部圧ポンプ(4)より送油する油は、この各油圧切
替通路(8)へは送油されない構成であり、又該各バル
ブ(3)が中立のときには、該各部圧ポンプ(4)より
送油する油は、該各中立切替通路(9)の該バルブ室(
2)の該バルブ(3)に設ケた鎖孔(25)を経て該各
部タンク(7)に還流される構成であり、このときは該
各部圧切替通路(8)の該バルブ室(2)は該バルブ(
3)で遮断されて、該各部圧ポンプ(4)より送油する
油は、この油圧切替通路(8)へは送油されない構成で
ある。Each of the above detection flows) When the vertical movement of (22) stops,
(29) and the valve arm (2)
The respective valves (3) are rotated through the respective neutral switching passages (9), and the oil sent from the respective hydraulic pumps (4) is rotated through the respective neutral switching passages (9).
), the oil is sent to each oil tank (7) through the six holes (25) provided in the valve (3) of the valve chamber (2), and at this time, each oil pressure switching passage (8 ), the valve treasure (2) is blocked by each valve (3),
The oil sent from each partial pressure pump (4) is configured so that it is not sent to each hydraulic pressure switching passage (8), and when each valve (3) is neutral, the oil sent from each partial pressure pump (4) The oil to be sent from the valve chamber (
The structure is such that the water is returned to the respective tanks (7) through the chain holes (25) provided in the valves (3) of 2), and at this time, the valve chambers (2) of the respective pressure switching passages (8) ) is the valve (
3), the oil sent from the respective pressure pumps (4) is not sent to this hydraulic pressure switching passage (8).
原動機(14)の回転により、走行車輪(18)、(1
9)及び苗植機(10)の各部が回転駆動し、走行車体
(11)は進行し、検出フロート(22)、(22)と
整地フロー) (23)とが土壌面を整地滑走しながら
、植付伝動ケース(15)により左右往復移動する苗載
台(21)に装填した苗を苗取出口から苗挿植装置(2
0)で分離し、該検出フロート(22) 、 (22
)及び整地フロート(23)で整地された一ヒ環筒へこ
のl■挿植装置(20)で苗挿植するが、この苗挿植作
業のときには、該谷検出フロート(22)は土壌の深さ
により個別に上下動しながら、土壌面を滑走して土壌表
土面との圧力を検出し、この各検出フロート(22)は
土壌の深さが深くなると高い圧力を検出して、この検出
フロート(22)は上動し、連結ロフト(29)及びバ
ルブアーム(27)を介してバルブ(3)を回動させて
、油圧ポンプ(4)より送油する油は油圧切替通路(8
)を通り油圧シリンダ(6)内へ送油され、ピストン(
30)を突出させて各車輪ケース(18)t−下方へ回
動させて、該各走行車輪(18)を個別に下降させ、1
4jA各検出フロート(22)の上動が停止すると、該
油圧ポンプ(4)より送油する油は中立切替通路(9)
を通り油タンク(7)内へ送油され、該油圧切替通路(
8)は該バルブ(3)で遮断され、該各走行車輪(19
)を個別に停止し、該走行車体(11)を土壌面に対し
てほぼ一定位置に保持して苗挿植が行なわれる。Due to the rotation of the prime mover (14), the running wheels (18), (1
9) and the seedling planting machine (10) are driven to rotate, the traveling vehicle body (11) advances, and the detection floats (22), (22) and the soil leveling flow (23) slide on the soil surface. The seedlings loaded on the seedling platform (21), which is reciprocated from side to side by the planting transmission case (15), are transferred from the seedling take-out port to the seedling transplanting device (2).
0) and the detection floats (22), (22
) and the soil leveling float (23), the seedlings are inserted into the tube using the transplanting device (20). During this seedling planting work, the valley detection float (22) is used to Each detection float (22) slides on the soil surface while moving up and down individually depending on the depth, and detects the pressure with the soil topsoil surface, and each detection float (22) detects higher pressure as the soil depth increases. The float (22) moves upward, rotates the valve (3) via the connecting loft (29) and the valve arm (27), and the oil sent from the hydraulic pump (4) is transferred to the hydraulic switching passage (8).
) into the hydraulic cylinder (6), and the piston (
30) to protrude and rotate each wheel case (18) t-downward to lower each running wheel (18) individually.
4jA When the upward movement of each detection float (22) stops, the oil sent from the hydraulic pump (4) is transferred to the neutral switching passage (9).
The oil is sent into the oil tank (7) through the oil pressure switching passage (
8) is shut off by the valve (3), and each traveling wheel (19
) are stopped individually and the traveling vehicle body (11) is held at a substantially constant position relative to the soil surface, and seedling planting is performed.
又上記とは逆に土壌の深さが浅くなると、該谷検出フロ
ート(22)は低い圧力を検出し、この検出フロー)
(22)は下動し、該連結ロット(29)及び該バルブ
アーム(27)を介して該バルブ(3)を回動させて、
該油圧シリンダ(6)内の油は該油圧切替通路(8)を
通って、該油タンク(7)内へ排油され、該油圧ポンプ
(4)より送油する油は中立切替通路(9)を通り該油
タンク(7)内へ排油されて、該ピストン(3o)は引
込み該各車輪ケース(1日)を上方へ回動させて、該各
走行車輪(19)を個別に上昇させ、該谷検出フロート
(22)の下動が停止すると、該油圧ポンプ(4)より
送油する油は該中立切替通路(9)を通り該油タンク(
7)内へ送油され、該油圧切替通路(8)は該バルブ(
3)で遮断され、該各走行車輪(19)を個別に停止し
、該走行車体(11)を土壌面に対してほぼ一定位置に
保持して苗挿植が行なわれる。Also, contrary to the above, when the soil depth becomes shallow, the valley detection float (22) detects a low pressure, and this detection flow)
(22) moves downward and rotates the valve (3) via the connecting rod (29) and the valve arm (27);
The oil in the hydraulic cylinder (6) passes through the hydraulic switching passage (8) and is drained into the oil tank (7), and the oil sent from the hydraulic pump (4) passes through the neutral switching passage (9). ) into the oil tank (7), the piston (3o) retracts and rotates each wheel case (1) upward, raising each traveling wheel (19) individually. When the valley detection float (22) stops moving downward, the oil sent from the hydraulic pump (4) passes through the neutral switching passage (9) and enters the oil tank (
7), and the hydraulic pressure switching passage (8) is connected to the valve (
3), each traveling wheel (19) is stopped individually, and the traveling vehicle body (11) is held at a substantially constant position with respect to the soil surface, and seedling planting is performed.
前記バルブ(3)が中立のときには、前記油圧ポンプ(
4)より送油する油は前記中立切替通路(9)を通り前
記油タンク(7)内へ還流する。When the valve (3) is neutral, the hydraulic pump (
4) The oil sent from the tank passes through the neutral switching passage (9) and flows back into the oil tank (7).
前記油圧ポンプ(4)より送油する油は、前記バルブ(
3)の回動により前記油圧切替通路(8)を通り前記油
圧シリンダ(6)内へ送油されたり、該油圧シリンダ(
6)内の油は該油圧切替通路(8)を通り前記油タンク
(7)内へ排油されたり、又前記中立通路(9)を通っ
て該油タンク(7)内へ還流することにより、該バルブ
(3)の切付タイミングのずれが発生することがないの
で、前記走行車体(11)は傾向くことがない。The oil sent from the hydraulic pump (4) is supplied to the valve (
3) causes oil to be sent into the hydraulic cylinder (6) through the hydraulic switching passage (8),
6) is drained into the oil tank (7) through the hydraulic pressure switching passage (8), or is returned through the neutral passage (9) into the oil tank (7). Since there is no deviation in the cutting timing of the valve (3), the traveling vehicle body (11) does not tilt.
図は、この発明の一実施例を示すもので、第1図はその
一部の拡大正断面図、第2図〜第6図はその一部の作用
を示す拡大側断面図、第7図は苗植機の側面図、第8図
は一部破断せる苗植機の平面図、第9図は従来装置のそ
の一部の作用を示す拡大側断面図である。
図中、符号(1)は油圧回路、(2)はバルブ室、(3
)はバルブ、(4)は油圧ポンプ、(5)は逆流防止弁
、(6)は油圧シリンダ、(7)は油タンク、(8)は
油圧切替通路、(9)は中立切替通路を示す。The drawings show an embodiment of the present invention; FIG. 1 is an enlarged front sectional view of a part thereof, FIGS. 2 to 6 are enlarged side sectional views showing the operation of a part thereof, and FIG. 8 is a partially cutaway plan view of the seedling transplanter, and FIG. 9 is an enlarged side sectional view showing the operation of a portion of the conventional device. In the figure, (1) is the hydraulic circuit, (2) is the valve chamber, and (3) is the hydraulic circuit.
) indicates the valve, (4) indicates the hydraulic pump, (5) indicates the check valve, (6) indicates the hydraulic cylinder, (7) indicates the oil tank, (8) indicates the hydraulic switching passage, and (9) indicates the neutral switching passage. .
Claims (1)
設けられるバルブ(3)の軸方向に沿って位置を異にし
て下記A、Bを設けてなる油圧シリンダの油圧切替バル
ブ。 A、油圧ポンプ(4)から逆流防止弁(5)を介して油
圧シリンダ(6)へ送油する送油行程と、この油圧シリ
ンダ(6)内の油を油タンク(7)へ排油する排油行程
とに切替える油圧切替通路(8)。 B、該油圧ポンプ(4)の送油を該油タンク(7)へ還
流される中立行程と、該送油行程並びに該排油行程にお
いて該油圧ポンプ(4)の送油を遮断する遮断行程とに
切替える中立切替通路(9)。[Scope of Claims] A hydraulic cylinder in which the following A and B are provided at different positions along the axial direction of a valve (3) rotatably provided in a valve chamber (2) of a hydraulic circuit (1). Hydraulic switching valve. A. Oil feeding process in which oil is sent from the hydraulic pump (4) to the hydraulic cylinder (6) via the check valve (5), and the oil in this hydraulic cylinder (6) is drained to the oil tank (7). A hydraulic switching passage (8) for switching to an oil drain stroke. B. A neutral stroke in which the oil sent by the hydraulic pump (4) is returned to the oil tank (7), and a cutoff stroke in which the oil sent by the hydraulic pump (4) is cut off during the oil feeding stroke and the oil draining stroke. Neutral switching path (9) for switching to and from.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19835685A JPS6258913A (en) | 1985-09-06 | 1985-09-06 | Hydraulic pressure change-over valve of hydraulic cylinder |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19835685A JPS6258913A (en) | 1985-09-06 | 1985-09-06 | Hydraulic pressure change-over valve of hydraulic cylinder |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6258913A true JPS6258913A (en) | 1987-03-14 |
Family
ID=16389744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19835685A Pending JPS6258913A (en) | 1985-09-06 | 1985-09-06 | Hydraulic pressure change-over valve of hydraulic cylinder |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6258913A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5220350A (en) * | 1990-07-30 | 1993-06-15 | Minolta Camera Kabushiki Kaisha | Method and apparatus for preventing overheating of a thermal head |
-
1985
- 1985-09-06 JP JP19835685A patent/JPS6258913A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5220350A (en) * | 1990-07-30 | 1993-06-15 | Minolta Camera Kabushiki Kaisha | Method and apparatus for preventing overheating of a thermal head |
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