JP2578939B2 - Work vehicle lift control device - Google Patents

Work vehicle lift control device

Info

Publication number
JP2578939B2
JP2578939B2 JP63236762A JP23676288A JP2578939B2 JP 2578939 B2 JP2578939 B2 JP 2578939B2 JP 63236762 A JP63236762 A JP 63236762A JP 23676288 A JP23676288 A JP 23676288A JP 2578939 B2 JP2578939 B2 JP 2578939B2
Authority
JP
Japan
Prior art keywords
control valve
hydraulic cylinder
state
main control
oil
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 - Fee Related
Application number
JP63236762A
Other languages
Japanese (ja)
Other versions
JPH0286702A (en
Inventor
克也 臼井
博 岸田
照男 南
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP63236762A priority Critical patent/JP2578939B2/en
Publication of JPH0286702A publication Critical patent/JPH0286702A/en
Application granted granted Critical
Publication of JP2578939B2 publication Critical patent/JP2578939B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Lifting Devices For Agricultural Implements (AREA)
  • Harvester Elements (AREA)
  • Fluid-Pressure Circuits (AREA)

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、走行車体に対して作業装置を昇降操作する
単動型の油圧シリンダの制御弁が、圧油を前記油圧シリ
ンダに流動させる状態と前記油圧シリンダからの圧油排
出を停止させる状態とに切り換え自在な電磁操作式のメ
イン制御弁と、そのメイン制御弁と前記油圧シリンダと
をつなぐ油路に接続されたドレン油路を開閉する電磁操
作式のサブ制御弁とから構成され、それらの制御弁を作
動させる昇降制御手段が、前記作業装置の上昇操作時に
は、前記メイン制御弁を圧油を前記油圧シリンダに流動
させる状態に維持し、且つ、下降操作時には、前記メイ
ン制御弁を前記油圧シリンダからの圧油排出を停止させ
る状態に維持して、前記サブ制御弁を繰り返し開閉操作
することにより前記作業装置の昇降速度を変更調節自在
に構成された作業車の昇降制御装置に関する。
DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a state in which a control valve of a single-acting hydraulic cylinder that raises and lowers a working device with respect to a traveling vehicle body causes pressure oil to flow through the hydraulic cylinder. And an electromagnetically operated main control valve which can be switched to a state in which the discharge of hydraulic oil from the hydraulic cylinder is stopped, and a drain oil passage connected to an oil passage connecting the main control valve and the hydraulic cylinder. An electromagnetically operated sub-control valve, and elevating control means for operating those control valves maintains the main control valve in a state in which hydraulic oil flows to the hydraulic cylinder when the working device is raised. And, at the time of the descending operation, the working device is maintained by repeatedly opening and closing the sub-control valve while maintaining the main control valve in a state of stopping the discharge of the hydraulic oil from the hydraulic cylinder. Of the lifting speed changes adjustably configured working vehicle relating to elevator controller.

〔従来の技術〕[Conventional technology]

上記この種の作業車の昇降制御装置は、圧油を昇降用
の単動型の油圧シリンダに流動させる状態と前記油圧シ
リンダからの圧油排出を停止させる状態とに切り換え自
在な電磁操作式のメイン制御弁の開閉操作と、そのメイ
ン制御弁と前記油圧シリンダとをつなぐ油路に接続され
たドレン油路を開閉する電磁操作式のサブ制御弁の繰り
返し開閉操作とを組み合わせることにより、作業装置の
昇降速度を変更調節できるようにしたものである。
The above-described lifting and lowering control device for a work vehicle is an electromagnetically operated type that is switchable between a state in which pressure oil flows to a single-acting hydraulic cylinder for lifting and a state in which discharge of hydraulic oil from the hydraulic cylinder is stopped. By combining the opening and closing operation of the main control valve with the repetitive opening and closing operation of an electromagnetically operated sub-control valve that opens and closes a drain oil passage connected to an oil passage connecting the main control valve and the hydraulic cylinder, The lifting speed can be changed and adjusted.

但し、従来では、メイン制御弁は、油圧シリンダに対
する圧油の流動と排出停止との二状態に切り換えられる
のみで、圧油を排出する状態には切り換えられないよう
になっていた(本出願人が先に提案した特願昭62−2137
13号参照)。
However, conventionally, the main control valve can be switched only between the two states of the flow of the hydraulic oil to the hydraulic cylinder and the stop of the discharge, and cannot be switched to the state of discharging the hydraulic oil (the present applicant). Proposed in Japanese Patent Application No. 62-2137
No. 13).

従って、下降速度は、サブ制御弁の開閉操作のみによ
って調節するようにしていた。
Therefore, the descending speed is adjusted only by opening and closing the sub-control valve.

〔発明が解決しようとする課題〕[Problems to be solved by the invention]

上記従来構成では、作業装置の下降速度をサブ制御弁
の開閉操作のみによって行うために、その速度調節範囲
が狭い欠点があった。
In the above-mentioned conventional configuration, since the lowering speed of the working device is performed only by the opening / closing operation of the sub-control valve, there is a disadvantage that the speed adjustment range is narrow.

ところで、作業装置を手動操作で下降させる場合に
は、迅速に下降できるようにするために、その下降速度
を高速化することが望まれるが、作業装置を自動的に昇
降操作して目標高さに維持させるような場合には、その
昇降速度を微調節しやすいように、低速下降させる必要
が生じるものとなる。
By the way, when lowering the working device by manual operation, it is desirable to increase the descent speed so that the working device can be lowered quickly. In such a case, it is necessary to lower the moving speed at a low speed so that the moving speed can be finely adjusted.

つまり、従来のように、下降速度の調節範囲が狭い
と、手動操作による高速下降と自動昇降による低速下降
とを一つのサブ制御弁の開閉操作のみで達成することは
困難であり、改善が望まれていた。
That is, if the adjustment range of the descent speed is narrow as in the conventional case, it is difficult to achieve high-speed descent by manual operation and low-speed descent by automatic elevating only by opening and closing one sub-control valve. Was rare.

本発明は、上記実情に鑑みてなされたものであって、
その目的は、作業装置の下降速度の調節範囲の拡大を図
ることにある。
The present invention has been made in view of the above circumstances,
The purpose is to expand the range of adjustment of the lowering speed of the working device.

〔課題を解決するための手段〕[Means for solving the problem]

本発明による作業車の昇降制御装置は、走行車体に対
して作業装置を昇降操作する単動型の油圧シリンダの制
御弁が、圧油を前記油圧シリンダに流動させる状態と前
記油圧シリンダからの圧油排出を停止させる状態とに切
り換え自在な電磁操作式のメイン制御弁と、そのメイン
制御弁と前記油圧シリンダとをつなぐ油路に接続された
ドレン油路を開閉する電磁操作式のサブ制御弁とから構
成され、それらの制御弁を作動させる昇降制御手段が、
前記作業装置の上昇操作時には、前記メイン制御弁を圧
油を前記油圧シリンダに流動させる状態に維持し、且
つ、下降操作時には、前記メイン制御弁を前記油圧シリ
ンダからの圧油排出を停止させる状態に維持して、前記
サブ制御弁を繰り返し開閉操作することにより前記作業
装置の昇降速度を変更調節自在に構成されたものであっ
て、その特徴構成は、以下の通りである。
The lift control device for a work vehicle according to the present invention includes a state in which a control valve of a single-acting hydraulic cylinder that raises and lowers the work device with respect to a traveling vehicle body controls a state in which hydraulic oil flows to the hydraulic cylinder and a pressure from the hydraulic cylinder. An electromagnetically operated main control valve that can be switched to a state in which oil discharge is stopped, and an electromagnetically operated sub control valve that opens and closes a drain oil passage connected to an oil passage connecting the main control valve and the hydraulic cylinder And lift control means for operating those control valves,
A state in which the main control valve is maintained in a state in which the hydraulic oil flows to the hydraulic cylinder during the raising operation of the working device, and the main control valve stops discharging the hydraulic oil from the hydraulic cylinder during the lowering operation. , And the sub-control valve is repeatedly opened and closed to change the ascending and descending speed of the working device so as to be freely adjustable. The characteristic structure is as follows.

すなわち、前記メイン制御弁は、前記油圧シリンダか
ら圧油を排出する状態にも切り換え自在に構成され、 且つ、前記メイン制御弁と前記油圧シリンダとをつな
ぐ油路と、前記ドレン油路との両方に、前記油圧シリン
ダからの圧油排出量を絞る絞り弁が設けられ、 前記昇降制御手段は、前記作業装置の下降操作時にお
いて、 前記メイン制御弁を前記油圧シリンダから圧油を排出
させる状態に維持して、前記サブ制御弁を繰り返し開閉
操作することにより前記作業装置の下降速度を変更調節
する状態と、 前記メイン制御弁を前記油圧シリンダからの圧油排出
を停止させる状態に維持して、前記サブ制御弁を繰り返
し開閉操作することにより前記作業装置の下降速度を変
更調節する状態とに切り換え自在に構成されている点に
ある。
That is, the main control valve is configured to be freely switchable to a state in which the hydraulic oil is discharged from the hydraulic cylinder, and both the oil path connecting the main control valve and the hydraulic cylinder and the drain oil path A throttle valve for reducing an amount of pressurized oil discharged from the hydraulic cylinder, wherein the elevation control means sets the main control valve to discharge the hydraulic oil from the hydraulic cylinder when the operation device is lowered. Maintaining a state in which the lowering speed of the working device is changed and adjusted by repeatedly opening and closing the sub-control valve, and a state in which the main control valve stops discharging hydraulic oil from the hydraulic cylinder, It is characterized in that the sub-control valve can be switched to a state in which the lowering speed of the working device is changed and adjusted by repeatedly opening and closing the sub-control valve.

〔作用〕[Action]

メイン制御弁を油圧シリンダからの圧油排出を停止さ
せる状態に維持して、油圧シリンダからの圧油の排出が
サブ制御弁のみから行われる状態にして、排出流量の総
量を少量にさせた低速下降状態で、サブ制御弁を繰り返
し開閉操作することにより、作業装置の下降速度を変更
調節できる。
The main control valve is kept in a state where the discharge of hydraulic oil from the hydraulic cylinder is stopped, and the discharge of hydraulic oil from the hydraulic cylinder is performed only from the sub-control valve, so that the total amount of discharge flow is small. In the lowering state, the lowering speed of the working device can be changed and adjusted by repeatedly opening and closing the sub-control valve.

又、メイン制御弁を油圧シリンダから圧油を排出させ
る状態に維持して、油圧シリンダからの圧油の排出が、
メイン制御弁とサブ制御弁の両方により行われる状態に
して、排出流量の総量を大きくさせた高速下降状態で、
サブ制御弁を繰り返し開閉操作することで、作業装置の
下降速度を変更調節できるものとなる。
Also, maintaining the main control valve in a state of discharging the hydraulic oil from the hydraulic cylinder, the discharge of the hydraulic oil from the hydraulic cylinder is
In the state of being performed by both the main control valve and the sub control valve, in the high-speed descending state where the total amount of discharge flow rate is increased,
By repeatedly opening and closing the sub control valve, the lowering speed of the working device can be changed and adjusted.

このように、油圧シリンダからの圧油排出流量を全体
として大小二段階の各状態に切り換えて、夫々の状態に
おいて下降速度を調節できるものとなる。
In this way, the flow rate of the hydraulic oil discharged from the hydraulic cylinder is switched between the two states, large and small, as a whole, and the descent speed can be adjusted in each state.

尚、前記各絞り弁は、上記いずれの状態においても、
油圧シリンダからの圧油の排出流量を抑制することで、
作業装置の重量に起因して下降速度が大きくなり過ぎる
ことを防止している。
In each of the above states,
By suppressing the discharge flow rate of hydraulic oil from the hydraulic cylinder,
This prevents the descending speed from becoming too large due to the weight of the working device.

〔発明の効果〕〔The invention's effect〕

従って、簡単な油圧回路の改造によって、作業装置の
下降速度の調節範囲を拡大することができ、各種の昇降
制御状態に対応した適切な速度で作業装置を下降操作さ
せることが可能となった。
Therefore, the adjustment range of the lowering speed of the working device can be expanded by a simple modification of the hydraulic circuit, and the lowering operation of the working device can be performed at an appropriate speed corresponding to various lifting control states.

〔実施例〕〔Example〕

以下、本発明をコンバインの刈取部を昇降操作するた
めの装置に適用した場合における実施例を図面に基づい
て説明する。
Hereinafter, an embodiment in which the present invention is applied to an apparatus for raising and lowering a harvesting unit of a combine will be described with reference to the drawings.

第5図に示すように、作業車としてのコンバインは、
左右一対のクローラ式の走行装置(1)を備えた走行車
体(V)と、その前部に昇降自在に連結された作業装置
としての刈取部(2)とを備えている。
As shown in FIG. 5, the combine as a working vehicle is
The vehicle body (V) includes a pair of left and right crawler-type traveling devices (1), and a mowing part (2) as a working device connected to the front of the traveling vehicle body so as to be able to move up and down.

そして、前記刈取部(2)は、単動型の油圧シリンダ
(3)によって昇降操作されるようになっている。
The mowing part (2) is operated to move up and down by a single-acting hydraulic cylinder (3).

又、前記刈取部(2)には、反射式の超音波センサ利
用の対地高さ検出用センサ(4)が設けられ、後述の如
く、前記対地高さ検出用センサ(4)の検出情報に基づ
いて自動的に設定された目標対地高さに維持できるよう
に構成されている。
Further, the cutting unit (2) is provided with a sensor (4) for detecting a ground height using a reflection type ultrasonic sensor, and as described later, the detection information of the sensor (4) for detecting the ground height is provided. It is configured to be able to maintain the target ground height automatically set based on the above.

但し、前記刈取部(2)は、手動操作で昇降させるこ
ともできるようになっている。
However, the mowing part (2) can be raised and lowered by manual operation.

前記油圧シリンダ(3)に対する油圧回路について説
明すれば、第1図に示すように、圧油を油圧シリンダ側
に流動させる状態と、圧油の排出を停止させる状態と、
圧油を油圧シリンダ側から排出する状態との三状態に切
り換え自在な電磁操作式のメイン制御弁(5)と、その
メイン制御弁(5)から前記油圧シリンダ(3)に向か
う油路(r1)に接続されたドレン油路(r2)を開閉する電磁
操作式のサブ制御弁(6)とが設けられている。
A hydraulic circuit for the hydraulic cylinder (3) will be described. As shown in FIG. 1, a state in which hydraulic oil flows to the hydraulic cylinder side, a state in which discharge of hydraulic oil is stopped,
An electromagnetically operated main control valve (5) that can be switched between three states, that is, a state in which hydraulic oil is discharged from the hydraulic cylinder side, and an oil passage (r) from the main control valve (5) to the hydraulic cylinder (3). electromagnetic operated sub control valve for opening and closing the connected drain oil path 1) (r 2) (6) and is provided.

但し、前記メイン制御弁(5)から前記油圧シリンダ
(3)に向かう油路(r1)には、前記油圧シリンダ(3)
からの圧油排出流量を絞る絞り弁(7)が設けられてい
る。又、前記ドレン油路(r2)にも、前記油圧シリンダ
(3)からの圧油排出流量を絞る絞り弁(8)が設けら
れている。
However, an oil passage (r 1 ) from the main control valve (5) to the hydraulic cylinder (3) is provided in the hydraulic cylinder (3).
A throttle valve (7) for reducing the flow rate of pressurized oil discharged from is provided. Also, the drain fluid passage (r 2), throttle valve for throttling the pressurized oil discharge flow rate from the hydraulic cylinder (3) (8) is provided.

さらに、図中(5a)は、メイン制御弁(5)が圧油を
排出する状態に切換えられるに伴って開き操作されるパ
イロット圧式の逆止弁、又(7a)は、前記絞り弁(7)
と並列状態に設けられる逆止弁である。
Further, in the figure, (5a) is a pilot pressure check valve which is opened when the main control valve (5) is switched to a state of discharging pressure oil, and (7a) is the throttle valve (7). )
And a check valve provided in parallel.

そして、ポテンショメータ利用の目標対地高さ設定器
(9)、人為的に操作する手動昇降用の昇降レバー(1
0)の操作状態を検出する昇降スイッチ(11)、及び、
前記対地高さ検出用センサ(4)の検出情報又は前記昇
降スイッチ(11)の情報に基づいて、前記両制御弁
(5),(6)の作動を制御する昇降制御手段(100)
を構成するマイクロコンピュータ利用の制御装置(12)
の夫々が設けられている。
Then, a target height setting device using a potentiometer (9) and a manually operated lifting / lowering lever (1)
0) an elevating switch (11) for detecting the operation state, and
Elevating control means (100) for controlling the operation of both control valves (5) and (6) based on the detection information of the sensor for detecting the ground height (4) or the information of the elevating switch (11).
Microcomputer-based control device (12)
Are provided.

尚、第1図中、(13)は、前記刈取部(2)を前記対
地高さ検出用センサ(4)の検出情報に基づいて自動的
に昇降操作するか、前記昇降レバー(10)の操作状態に
基づいて昇降操作するかを切り換えるための自動スイッ
チであって、前記制御装置(12)に対して、ON状態で自
動的に昇降操作する自動モードを、且つ、OFF状態で手
動操作で昇降する手動モードを指示するようになってい
る。
In FIG. 1, (13) is used to automatically raise or lower the reaper (2) based on the detection information of the ground height detecting sensor (4), or to operate the raising / lowering lever (10). An automatic switch for switching whether to perform an elevating operation based on an operation state, wherein the controller (12) has an automatic mode in which the elevating operation is automatically performed in an ON state, and a manual operation in an OFF state. The manual mode for elevating and lowering is instructed.

但し、自動モードにおいては、前記目標対地高さと検
出対地高さとの偏差の大きさに基づいて、偏差が大なる
ほど前記刈取部(2)の昇降速度が大となるように、前
記メイン制御弁(5)を開又は閉の状態に維持しなが
ら、前記偏差が大なるほどデューティ比が大となるよう
にパルス幅変調された駆動信号で、前記サブ制御弁
(6)を繰り返し開閉操作するようになっている。
However, in the automatic mode, the main control valve (based on the magnitude of the deviation between the target ground height and the detected ground height) is set such that the larger the deviation is, the higher the elevation speed of the reaper (2) is. 5) While maintaining the open or closed state, the sub-control valve (6) is repeatedly opened and closed by a drive signal pulse-width modulated so that the duty ratio increases as the deviation increases. ing.

一方、手動モードにおいては、前記両制御弁(5),
(6)は開又は閉の状態に維持するだけでパルス駆動は
しないようになっている。
On the other hand, in the manual mode, the control valves (5), (5)
In (6), the pulse drive is not performed, but only the open or closed state is maintained.

前記手動モードにおける昇降操作について説明を加え
れば、第3図及び第4図に示すように、前記昇降レバー
(10)の操作状態は、中立位置範囲(N)から上昇側及
び下降側の夫々における揺動角範囲を、複数個のスイッ
チのON/OFF状態の組み合わせとして、大小二段階に検出
するようになっている。
The lifting operation in the manual mode will be further described. As shown in FIGS. 3 and 4, the operation state of the lifting lever (10) is different from the neutral position range (N) on the ascending side and the descending side, respectively. The swing angle range is detected in two levels, large and small, as a combination of ON / OFF states of a plurality of switches.

すなわち、前記昇降スイッチ(11)は、前記昇降レバ
ー(10)によって回動操作される共通接点(14)と、円
形のスイッチ板(15)の円周に沿って形成された二列の
接点を備えた一対の上昇操作検出用スイッチ(S1),(S2)
と一対の下降操作検出スイッチ(S3),(S4)の4個のスイ
ッチ(S1),(S2),(S3),(S4)から構成されている。
That is, the elevation switch (11) is provided with a common contact (14) rotated by the elevation lever (10) and two rows of contacts formed along the circumference of the circular switch plate (15). A pair of switches for detecting rising operation (S 1 ), (S 2 )
And four switches (S 1 ), (S 2 ), (S 3 ) and (S 4 ) of a pair of lowering operation detection switches (S 3 ) and (S 4 ).

つまり、前記昇降レバー(10)が中立位置範囲(N)
から上昇側又は下降側に揺動操作されるに伴って、上昇
小(U1)、上昇大(U2)、下降小(D1)、及び、下降大(D2)の
夫々の各操作範囲に対応して、前記4個のスイッチ
(S1),(S2),(S3),(S4)の夫々が、下記表に示す組み合わ
せ状態でON/OFFするようになっている。そして、前記両
制御弁(5),(6)の夫々が、各スイッチのON/OFFの
組み合わせに対応して駆動されるようになっている。
That is, the lifting lever (10) is in the neutral position range (N).
As the swing operation is performed from the upper side to the lower side or the lower side, the respective operations of a small ascending (U 1 ), a large ascending (U 2 ), a small descending (D 1 ), and a large descending (D 2 ) The four switches corresponding to the range
Each of (S 1 ), (S 2 ), (S 3 ), and (S 4 ) is turned ON / OFF in a combination state shown in the following table. Each of the control valves (5) and (6) is driven in accordance with the ON / OFF combination of each switch.

つまり、前記昇降レバー(10)の揺動角の大きさに応
じて、前記刈取部(2)の昇降速度が自動的に高低二段
階に切り換えられるようになっているのである。
That is, according to the magnitude of the swing angle of the lifting lever (10), the lifting speed of the reaper (2) is automatically switched between high and low.

但し、上記表において、“1"はスイッチのONを示し、
“0"はスイッチのOFFを示す。
However, in the above table, “1” indicates switch ON,
“0” indicates switch OFF.

次に、第2図に示すフローチャートに基づいて、自動
モードにおける前記制御装置の動作について詳述する。
Next, the operation of the control device in the automatic mode will be described in detail based on the flowchart shown in FIG.

すなわち、昇降制御が起動されるに伴って、前記目標
対地高さと検出対地高さとの偏差を求め、その偏差が設
定不感帯内にある場合には前記両制御弁(5),(6)
の作動を停止させて、前記刈取部(2)を現在の対地高
さに維持することになる。
That is, as the elevation control is activated, a deviation between the target ground height and the detected ground height is determined, and when the deviation is within the set dead zone, the two control valves (5) and (6) are used.
Is stopped, and the mowing part (2) is maintained at the current ground height.

前記偏差が設定不感帯外にある場合には、それの符号
に基づいて、前記刈取部(2)を上昇させるか下降させ
るかを判別する。
When the deviation is outside the setting dead zone, it is determined whether to raise or lower the reaper (2) based on the sign of the deviation.

上昇である場合には、前記メイン制御弁(5)を前記
油圧シリンダ(3)に圧油を流動させる方向で開状態に
維持しながら、前記サブ制御弁(6)を、前記偏差の大
きさに基づいてパルス駆動することになる。
In the case of rising, while maintaining the main control valve (5) open in the direction in which the hydraulic oil flows into the hydraulic cylinder (3), the sub control valve (6) is set to the magnitude of the deviation. Pulse driving based on the

一方、下降である場合には、前記偏差が、下降速度を
大小に切り換えるために予め設定した設定値(α)以上
であるか否かを判別して、下降速度を自動的に高低二段
階に切り換えながら、前記偏差に応じた昇降速度で下降
させるようにしてある。
On the other hand, in the case of a descent, it is determined whether or not the deviation is equal to or greater than a preset value (α) for switching the descent speed between large and small, and the descent speed is automatically increased to two levels. While switching, it is lowered at an elevating speed corresponding to the deviation.

つまり、前記偏差が前記設定値(α)以上である場合
には、前記メイン制御弁(5)を前記油圧シリンダ
(3)から圧油を排出する方向で開状態に維持しなが
ら、前記サブ制御弁(6)を前記偏差の大きさに基づい
てパルス駆動して、下降速度を大の範囲において自動調
節することになり、前記偏差が前記設定値(α)未満で
ある場合には、前記メイン制御弁(5)を前記油圧シリ
ンダ(3)からの圧油排出を停止させる閉状態に維持し
ながら、前記サブ制御弁(6)を前記偏差の大きさに基
づいてパルス駆動して、下降速度を小の範囲において自
動調節することになる。
That is, when the deviation is equal to or more than the set value (α), the sub control is performed while maintaining the main control valve (5) open in the direction of discharging the hydraulic oil from the hydraulic cylinder (3). The valve (6) is pulse-driven based on the magnitude of the deviation to automatically adjust the descending speed in a large range, and when the deviation is less than the set value (α), The sub-control valve (6) is pulse-driven on the basis of the magnitude of the deviation while maintaining the control valve (5) in a closed state for stopping the discharge of the hydraulic oil from the hydraulic cylinder (3), thereby reducing the descent speed. Will be automatically adjusted in a small range.

〔別実施例〕(Another embodiment)

上記実施例では、本発明をコンバインに適用した場合
を例示したが、本発明は各種の作業車の作業装置を昇降
操作するための装置に適用できるものであって、各部の
具体構成は各種変更できる。
In the above embodiment, the case where the present invention is applied to a combine is illustrated. However, the present invention can be applied to a device for lifting and lowering a working device of various working vehicles, and a specific configuration of each part is variously changed. it can.

又、上記実施例ではパイロット圧式の逆止弁(5a)を
組込む場合を例示したが、その逆止弁(5a)を省略して
もよい。
In the above embodiment, the case where the pilot pressure check valve (5a) is incorporated is exemplified, but the check valve (5a) may be omitted.

尚、特許請求の範囲の項に図面との対象を便利にする
為に符号を記すが、該記入により本発明は添付図面の構
造に限定されるものではない。
Note that, in the claims, reference numerals are written for convenience of the drawings, but the present invention is not limited to the structure of the attached drawings by the entry.

【図面の簡単な説明】[Brief description of the drawings]

図面は本発明に係る作業車の昇降制御装置の実施例を示
し、第1図は制御構成のブロック図、第2図は昇降制御
のフローチャート、第3図は手動昇降用スイッチの切欠
平面図、第4図は同断面図、第5図はコンバインの前部
側面図である。 (V)……走行車体、(2)……作業装置、(3)……
油圧シリンダ、(5)……メイン制御弁、(6)……サ
ブ制御弁、(7),(8)……絞り弁、(r1)……油路、
(r2)……ドレン油路、(100)……昇降制御手段。
The drawings show an embodiment of a work vehicle elevating control device according to the present invention, FIG. 1 is a block diagram of a control configuration, FIG. 2 is a flowchart of elevating control, FIG. 3 is a cutaway plan view of a manual elevating switch, FIG. 4 is a sectional view of the same, and FIG. 5 is a front side view of the combine. (V): traveling vehicle body, (2): working device, (3):
Hydraulic cylinder, (5) Main control valve, (6) Sub-control valve, (7), (8) Throttle valve, (r 1 ) Oil path,
(r 2 ): drain oil passage, (100): elevating control means.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−61503(JP,A) 実開 昭50−151004(JP,U) 実開 昭57−155026(JP,U) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-61503 (JP, A) JP-A-50-151004 (JP, U) JP-A-57-155026 (JP, U)

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】走行車体(V)に対して作業装置(2)を
昇降操作する単動型の油圧シリンダ(3)の制御弁が、 圧油を前記油圧シリンダ(3)に流動させる状態と、前
記油圧シリンダ(3)からの圧油排出を停止させる状態
とに切り換え自在な電磁操作式のメイン制御弁(5)
と、 そのメイン制御弁(5)と前記油圧シリンダ(3)とを
つなぐ油路(r1)に接続されたドレン油路(r2)を開閉する
電磁操作式のサブ制御弁(6)とから構成され、 それらの制御弁(5),(6)を作動させる昇降制御手
段(100)が、前記作業装置(2)の上昇操作時には、
前記メイン制御弁(5)を圧油を前記油圧シリンダ
(3)に流動させる状態に維持し、且つ、下降操作時に
は、前記メイン制御弁(5)を前記油圧シリンダ(3)
からの圧油排出を停止させる状態に維持して、前記サブ
制御弁(6)を繰り返し開閉操作することにより、前記
作業装置(2)の昇降速度を変更調節自在に構成された
作業車の昇降制御装置であって、 前記メイン制御弁(5)は、前記油圧シリンダ(3)か
ら圧油を排出する状態にも切り換え自在に構成され、 且つ、前記メイン制御弁(5)と前記油圧シリンダ
(3)とをつなぐ油路(r1)と、前記ドレン油路(r2)との
両方に、前記油圧シリンダ(3)からの圧油排出量を絞
る絞り弁(7),(8)が設けられ、 前記昇降制御手段(100)は、前記作業装置(2)の下
降操作時において、 前記メイン制御弁(5)を前記油圧シリンダ(3)から
圧油を排出させる状態に維持して、前記サブ制御弁
(6)を繰り返し開閉操作することにより前記作業装置
(2)の下降速度を変更調節する状態と、 前記メイン制御弁(5)を前記油圧シリンダ(3)から
の圧油排出を停止させる状態に維持して、前記サブ制御
弁(6)を繰り返し開閉操作することにより前記作業装
置(2)の下降速度を変更調節する状態とに切り換え自
在に構成されている作業車の昇降制御装置。
1. A state in which a control valve of a single-acting hydraulic cylinder (3) for raising and lowering a working device (2) with respect to a traveling vehicle body (V) causes hydraulic oil to flow to the hydraulic cylinder (3). An electromagnetically operated main control valve (5) which can be switched to a state in which the discharge of hydraulic oil from the hydraulic cylinder (3) is stopped.
An electromagnetically operated sub-control valve (6) for opening and closing a drain oil passage (r 2 ) connected to an oil passage (r 1 ) connecting the main control valve (5) and the hydraulic cylinder (3); The lifting / lowering control means (100) for operating the control valves (5) and (6) is provided when the working device (2) is raised.
The main control valve (5) is maintained in a state in which the pressure oil flows to the hydraulic cylinder (3), and at the time of the descending operation, the main control valve (5) is set to the hydraulic cylinder (3).
The sub-control valve (6) is repeatedly opened / closed while maintaining the state in which the discharge of hydraulic oil from the engine is stopped, so that the lifting / lowering speed of the working device (2) can be changed and adjusted. A control device, wherein the main control valve (5) is configured to be freely switchable to a state in which hydraulic oil is discharged from the hydraulic cylinder (3), and the main control valve (5) and the hydraulic cylinder ( Throttle valves (7) and (8) for reducing the amount of pressurized oil discharged from the hydraulic cylinder (3) are provided in both an oil path (r 1 ) connecting the hydraulic cylinder (3) and the drain oil path (r 2 ). The lifting control means (100) is provided to maintain the main control valve (5) in a state of discharging hydraulic oil from the hydraulic cylinder (3) when the working device (2) is lowered, By repeatedly opening and closing the sub-control valve (6), the operation is performed. The sub control valve (6) while maintaining the state in which the lowering speed of the hydraulic device (2) is changed and adjusted; and the state in which the main control valve (5) stops discharging the hydraulic oil from the hydraulic cylinder (3). A lifting and lowering control device for a working vehicle configured to be capable of switching to a state in which the lowering speed of the working device (2) is changed and adjusted by repeatedly opening and closing the device.
JP63236762A 1988-09-21 1988-09-21 Work vehicle lift control device Expired - Fee Related JP2578939B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63236762A JP2578939B2 (en) 1988-09-21 1988-09-21 Work vehicle lift control device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63236762A JP2578939B2 (en) 1988-09-21 1988-09-21 Work vehicle lift control device

Publications (2)

Publication Number Publication Date
JPH0286702A JPH0286702A (en) 1990-03-27
JP2578939B2 true JP2578939B2 (en) 1997-02-05

Family

ID=17005417

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63236762A Expired - Fee Related JP2578939B2 (en) 1988-09-21 1988-09-21 Work vehicle lift control device

Country Status (1)

Country Link
JP (1) JP2578939B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4994296B2 (en) * 2008-04-22 2012-08-08 株式会社 神崎高級工機製作所 Hydraulic circuit for lifting the harvesting part of the combine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5555339Y2 (en) * 1974-05-29 1980-12-22
JPS6261503A (en) * 1985-09-12 1987-03-18 株式会社クボタ Hydraulic lifting and falling apparatus for agricultural machine

Also Published As

Publication number Publication date
JPH0286702A (en) 1990-03-27

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