JPH09111799A - Interference prevention control circuit for working machine - Google Patents
Interference prevention control circuit for working machineInfo
- Publication number
- JPH09111799A JPH09111799A JP27385095A JP27385095A JPH09111799A JP H09111799 A JPH09111799 A JP H09111799A JP 27385095 A JP27385095 A JP 27385095A JP 27385095 A JP27385095 A JP 27385095A JP H09111799 A JPH09111799 A JP H09111799A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- valve
- pressure reducing
- reducing valve
- pilot
- 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.)
- Granted
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/20—Drives; Control devices
- E02F9/2025—Particular purposes of control systems not otherwise provided for
- E02F9/2033—Limiting the movement of frames or implements, e.g. to avoid collision between implements and the cabin
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Component Parts Of Construction Machinery (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ミニショベル等の
土木作業用等の作業機のバケットが運転席と干渉するこ
とを防止する干渉防止制御回路に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interference prevention control circuit for preventing a bucket of a work machine such as a mini excavator for civil engineering work from interfering with a driver's seat.
【０００２】[0002]
【従来の技術】従来、この種の作業機のバケットは、メ
インポンプからの作動油がコントロールバルブを介して
供給されたシリンダにより駆動され、該コントロールバ
ルブの作動を、減圧弁（ジョイスティック弁）で制御し
たパイロットポンプからのパイロット回路の流体圧力で
制御することによって該シリンダの作動即ちバケットの
掘削等の作動を制御している。この場合、該バケットが
左右にオフセットされるものであると該作業機の運転席
と干渉する不都合があり、この不都合を防止するため、
該パイロット回路の減圧弁とコントロールバルブとの間
に電磁比例減圧弁を設け、該電磁比例減圧弁を該バケッ
トと運転席との位置関係を検知するコントローラの電気
信号によって制御することが行われている（特開平５ー
２７２１５５号公報）。該バケットが運転席と干渉しそ
うな領域に進入したとき、該コントローラからの信号で
該電磁比例減圧弁が該パイロット回路の圧力を低減し、
これによって該コントロールバルブが該シリンダへの作
動油の供給を減少させるように作動し、該バケットの動
きを減速しながら更に減圧弁を中立位置に該作業機のオ
ペレータが操作することで、該干渉による運転席の破損
を防止している。2. Description of the Related Art Conventionally, a bucket of this type of working machine is driven by a cylinder to which hydraulic oil from a main pump is supplied through a control valve, and the operation of the control valve is controlled by a pressure reducing valve (joystick valve). By controlling the fluid pressure of the pilot circuit from the controlled pilot pump, the operation of the cylinder, that is, the operation of excavating the bucket is controlled. In this case, if the bucket is offset to the left and right, there is the inconvenience of interfering with the driver's seat of the work machine. To prevent this inconvenience,
An electromagnetic proportional pressure reducing valve is provided between the pressure reducing valve of the pilot circuit and the control valve, and the electromagnetic proportional pressure reducing valve is controlled by an electric signal from a controller that detects the positional relationship between the bucket and the driver's seat. (Japanese Patent Laid-Open No. 5-272155). When the bucket enters a region likely to interfere with the driver's seat, the electromagnetic proportional pressure reducing valve reduces the pressure in the pilot circuit by a signal from the controller,
As a result, the control valve operates so as to reduce the supply of hydraulic oil to the cylinder, and the operator of the work machine operates the depressurization valve to the neutral position while decelerating the movement of the bucket. It prevents the driver's seat from being damaged.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の装置では、
バケットが該干渉しそうな領域に進入しコントローラか
ら該電磁比例減圧弁へバケット減速の指令が出されてい
る状態で、オペレータがバケットを停止すべく該パイロ
ット回路の減圧弁（ジョイスティック弁）を中立位置
（最大減圧位置）へ操作したとき、電磁比例減圧弁はそ
の２次側の圧力を信号として作動する弁であるため、そ
の１次側がタンクへ接続されても該指令に対応した圧力
を維持しようとし、このため、該減圧弁を中立位置に操
作しても、その２次側の圧力は抜けず、コントロールバ
ルブは多少とも該シリンダへ作動油を流通させ続け、バ
ケットが動き続けるという不具合が発生する。尚、電磁
比例減圧弁は、その２次側からタンクへつながるタンク
ポートへの漏れがあるので、時間が経って２次側の圧力
が低下すると自動的に該電磁比例減圧弁の２次側と１次
側が開通し、２次側の圧力がタンク圧となってバケット
が停止するが、これは応答性が悪く実用的でない。In the above-mentioned conventional apparatus,
With the bucket entering the area where it is likely to interfere and the controller issues a bucket deceleration command to the electromagnetic proportional pressure reducing valve, the operator sets the pressure reducing valve (joystick valve) of the pilot circuit to the neutral position in order to stop the bucket. When operated to the (maximum pressure reducing position), the electromagnetic proportional pressure reducing valve is a valve that operates by using the pressure of its secondary side as a signal, so maintain the pressure corresponding to the command even if its primary side is connected to the tank. Therefore, even if the pressure reducing valve is operated to the neutral position, the pressure on the secondary side does not escape, and the control valve causes the hydraulic oil to continue to flow to the cylinder to some extent and the bucket continues to move. To do. Since the electromagnetic proportional pressure reducing valve leaks from the secondary side to the tank port connected to the tank, when the pressure on the secondary side decreases over time, the electromagnetic proportional pressure reducing valve automatically changes to the secondary side. The primary side is opened and the pressure on the secondary side becomes the tank pressure to stop the bucket, but this is not responsive and is not practical.
【０００４】本発明は、このような電磁比例減圧弁を備
えた干渉防止制御回路に於いてバケットが干渉防止領域
に入りコントローラから減速の指令が該電磁比例減圧弁
に対して出されている状態でも減圧弁の操作でバケット
を急停止できる装置を提供することを目的とするもので
ある。According to the present invention, in the interference prevention control circuit provided with such an electromagnetic proportional pressure reducing valve, the bucket enters the interference preventing region and the controller issues a deceleration command to the electromagnetic proportional pressure reducing valve. However, it is an object of the present invention to provide a device that can suddenly stop a bucket by operating a pressure reducing valve.
【０００５】[0005]
【課題を解決するための手段】本発明では、メインポン
プからの作動油をコントロールバルブを介して作業機の
バケットを駆動するシリンダへ供給し、該コントロール
バルブの作動を、減圧弁で制御したパイロットポンプか
らのパイロット回路の流体圧力で制御すると共に該バケ
ットの該作業機の運転席との位置関係を検知するコント
ローラの電気信号によって作動する該パイロット回路の
該減圧弁とコントロールバルブ間に設けた電磁比例減圧
弁で制御する干渉防止制御回路装置に於いて、該パイロ
ット回路のコントロールバルブと電磁比例減圧弁の間の
２次回路を該パイロット回路の該減圧弁と該電磁比例減
圧弁の間の１次回路に直結するバイパス回路を設け、該
バイパス回路に該２次回路から１次回路へのフリーフロ
ーを許容するチェック弁を設けることにより、上記の目
的を達成するようにした。該バケットが複数本のシリン
ダにより駆動され、各シリンダが各コントロールバルブ
により夫々作動制御されているときは、各コントロール
バルブを夫々の減圧弁で制御した上記パイロットポンプ
から分岐した複数のパイロット回路の流体圧力で制御
し、各パイロット回路の減圧弁とコントロールバルブ間
に該コントローラの信号で制御された電磁比例減圧弁を
夫々設け、各パイロット回路の少なくとも１つに該チェ
ック弁を備えた該バイパス回路が設けられる。According to the present invention, a pilot oil is supplied from a main pump to a cylinder for driving a bucket of a working machine via a control valve, and the operation of the control valve is controlled by a pressure reducing valve. Electromagnetic provided between the pressure reducing valve and the control valve of the pilot circuit, which is controlled by the fluid pressure of the pilot circuit from the pump and is operated by the electric signal of the controller that detects the positional relationship between the bucket and the driver's seat of the working machine. In an interference prevention control circuit device controlled by a proportional pressure reducing valve, a secondary circuit between the control valve of the pilot circuit and the electromagnetic proportional pressure reducing valve is provided with a secondary circuit between the pressure reducing valve of the pilot circuit and the electromagnetic proportional pressure reducing valve. A bypass circuit that is directly connected to the next circuit is provided, and the bypass circuit is allowed to allow free flow from the secondary circuit to the primary circuit. By providing the click valve, it was set to achieve the above object. When the bucket is driven by a plurality of cylinders and the operation of each cylinder is controlled by each control valve, the fluid of a plurality of pilot circuits branched from the pilot pump in which each control valve is controlled by each pressure reducing valve is used. An electromagnetic proportional pressure reducing valve controlled by pressure and controlled by a signal of the controller is provided between the pressure reducing valve of each pilot circuit and the control valve, and the bypass circuit having the check valve in at least one of the pilot circuits is provided. It is provided.
【０００６】[0006]
【発明の実施の形態】本発明の実施の形態を図面に基づ
き説明すると、図１に於いて符号１はオペレータの運転
席２とバケット３を備えたミニパワーショベルの作業機
を示し、該バケット３を、該作業機１の前方へ延びるブ
ーム４と、該ブーム４の先端に於いて紙面の略垂直方向
即ち作業機１の左右へオフセットするためのブーム５
と、該ブーム５の先端に設けたアーム６を介して取り付
けした。該ブーム４にはこれを起伏させるためのシリン
ダ７及びブーム５をオフセットするためのシリンダ８が
取り付けられ、該アーム６にはバケット３に掘削作動を
行わせるためのシリンダ９が取り付けられる。符号１
０、１１は、メインポンプ１２からの作動油を図示して
ない配管を介して該シリンダ７とシリンダ９に供給する
ための例えばスプリングセンタ形の３位置４方向比例制
御弁から成るコントロールバルブを示し、各コントロー
ルバルブ１０、１１はそのスプールの端部にパイロット
ポンプ１３からの流体圧力が作用すると該シリンダ７、
９を伸縮させ、その作用がないときは該シリンダ７、９
を停止させるように制御する。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a working machine of a mini power shovel equipped with a driver's seat 2 and a bucket 3 of an operator. 3, a boom 4 extending forward of the working machine 1, and a boom 5 for offsetting the boom 4 at the tip end of the boom 4 in a direction substantially perpendicular to the plane of the drawing, that is, to the left and right of the working machine 1.
And attached via an arm 6 provided at the tip of the boom 5. A cylinder 7 for hoisting the boom 4 and a cylinder 8 for offsetting the boom 5 are attached to the boom 4, and a cylinder 9 for causing the bucket 3 to perform an excavating operation is attached to the arm 6. Sign 1
Reference numerals 0 and 11 denote control valves for supplying hydraulic oil from the main pump 12 to the cylinders 7 and 9 through a pipe (not shown), such as a spring center type three-position four-way proportional control valve. When the fluid pressure from the pilot pump 13 acts on the end of the spool of each control valve 10, 11, the cylinder 7,
9 is expanded and contracted, and when there is no effect, the cylinders 7, 9
Control to stop.
【０００７】該パイロットポンプ１３からの圧力流体
は、パイロット回路１４、１５を介してコントロールバ
ルブ１０、１１の一端に導入され、その圧力はジョイス
ティック弁から成る減圧弁１６、１７により制御され
る。一方の減圧弁１６を操作すると、該コントロールバ
ルブ１０の開弁度が変化してシリンダ７への流量が制御
され、ブーム４の上方への移動速度が制御される。ま
た、他方の減圧弁１７を操作すると、該コントロールバ
ルブ１１の開弁度が変化してシリンダ９への流量が制御
され、バケット３の掘削速度が制御される。The pressure fluid from the pilot pump 13 is introduced into one end of the control valves 10 and 11 via the pilot circuits 14 and 15, and the pressure thereof is controlled by the pressure reducing valves 16 and 17 which are joystick valves. When one of the pressure reducing valves 16 is operated, the opening degree of the control valve 10 is changed, the flow rate to the cylinder 7 is controlled, and the upward movement speed of the boom 4 is controlled. When the other pressure reducing valve 17 is operated, the opening degree of the control valve 11 is changed, the flow rate to the cylinder 9 is controlled, and the excavation speed of the bucket 3 is controlled.
【０００８】該バケット３の位置が運転席２の前方へオ
フセットされていると、例えば掘削作動時にバケット３
が運転席２と干渉するおそれがあるので、該パイロット
回路１４、１５の減圧弁１６、１７とコントロールバル
ブ１０、１１の間の回路に電磁比例減圧弁１９、２０を
設けると共に、ブーム４、５、アーム６等の動きから該
バケット３と運転席２の位置関係を検出するコントロー
ラ１８を設け、該バケット３が運転席２と干渉するおそ
れのある領域に進入すると、該コントローラ１８から各
電磁比例減圧弁１９、２０へ電気信号を出力し、該電磁
比例減圧弁１９、２０がその信号強度に応じて該パイロ
ット回路１４、１５の流体圧力を減少させ、コントロー
ルバルブ１０、１１をその中立位置方向へ戻し、シリン
ダ７、９の作動を強制的に減速することにより、バケッ
ト３を減速し運転席２との干渉を防止する。If the position of the bucket 3 is offset to the front of the driver's seat 2, for example, the bucket 3 will be operated during excavation operation.
May interfere with the driver's seat 2. Therefore, electromagnetic proportional pressure reducing valves 19, 20 are provided in the circuit between the pressure reducing valves 16, 17 of the pilot circuits 14, 15 and the control valves 10, 11 and the booms 4, 5, , A controller 18 for detecting the positional relationship between the bucket 3 and the driver's seat 2 based on the movement of the arm 6, etc. is provided, and when the bucket 3 enters a region where the bucket 3 may interfere with the driver's seat 2, the controller 18 causes each electromagnetic proportional An electric signal is output to the pressure reducing valves 19 and 20, and the electromagnetic proportional pressure reducing valves 19 and 20 reduce the fluid pressure of the pilot circuits 14 and 15 in accordance with the signal strength, and the control valves 10 and 11 are moved toward their neutral positions. Returning to the above and forcibly decelerating the operation of the cylinders 7 and 9, the bucket 3 is decelerated and the interference with the driver's seat 2 is prevented.
【０００９】この減速されたときにオペレータがバケッ
ト３を停止すべく減圧弁１６を中立位置に操作しても、
前記したように該電磁比例減圧弁１９の２次回路１４ａ
の圧力がコントローラ１８の指令圧以下には急激に減圧
されず、バケット３が動き続ける不都合があるが、本発
明に於いては、該パイロット回路１４の電磁比例減圧弁
１９前後の２次回路１４ａと１次回路１４ｂを直結する
バイパス回路２１を設け、該バイパス回路２１に該２次
回路１４ａから１次回路１４ｂへのフリーフローを許容
するチェック弁２２を設けて該不都合を解消するように
した。尚、図示の例ではパイロット回路１４についての
みバイパス回路２１及びチェック弁２２を設けたが、必
要ならばパイロット回路１５にも同様のバイパス回路及
びチェック弁を設けるようにしても良い。また、各コン
トロールバルブ１０、１１の他端へのパイロット回路も
図示のパイロット回路１４、１５と同様に構成されるの
で、その記載を省略したが、この省略したパイロット回
路にもコントローラ１８により制御される電磁比例減圧
弁を設け、上記と同様のチェック弁を備えたバイパス回
路を設けるようにしてもよい。Even if the operator operates the pressure reducing valve 16 to the neutral position to stop the bucket 3 when the speed is reduced,
As described above, the secondary circuit 14a of the electromagnetic proportional pressure reducing valve 19
The pressure is not sharply reduced below the command pressure of the controller 18 and the bucket 3 continues to move, but in the present invention, the secondary circuit 14a before and after the electromagnetic proportional pressure reducing valve 19 of the pilot circuit 14 is used. A bypass circuit 21 is provided to directly connect the primary circuit 14b with the primary circuit 14b, and the bypass circuit 21 is provided with a check valve 22 for allowing free flow from the secondary circuit 14a to the primary circuit 14b to eliminate the inconvenience. . In the illustrated example, the bypass circuit 21 and the check valve 22 are provided only for the pilot circuit 14, but the pilot circuit 15 may be provided with the same bypass circuit and check valve if necessary. Further, the pilot circuits to the other ends of the control valves 10 and 11 are also configured in the same manner as the pilot circuits 14 and 15 shown in the figure, so the description thereof is omitted, but the omitted pilot circuits are also controlled by the controller 18. An electromagnetic proportional pressure reducing valve may be provided, and a bypass circuit including a check valve similar to the above may be provided.
【００１０】該電磁比例減圧弁１９、２０の具体的取付
状態は図２に示す如くであり、弁筺２３とこれに挿入し
たバレル２４との間にポンプポートＰ1、Ｐ2、アクチュ
エータポートＡ1、Ａ2、タンクポートＴ、Ｔを形成し、
該バレル内にソレノイド２５、２６によりばね２７、２
８に抗して摺動するスプール２９、３０を設け、一方の
電磁比例減圧弁１９のバイパス回路２１及びチェック弁
２２を該弁筺２３内にポンプポートＰ1とアクチュエー
タポートＡ1を直結して設けるようにした。尚、該チェ
ック弁２２は、図２のように弁筺２３に設置せずに、該
弁筺２３の外部にポートＡ1とＰ1を結ぶように取付けて
もよい。The specific mounting state of the electromagnetic proportional pressure reducing valves 19 and 20 is as shown in FIG. 2, in which the pump ports P 1 and P 2 and the actuator port A are provided between the valve casing 23 and the barrel 24 inserted therein. 1 , A 2 , tank ports T, T are formed,
Solenoids 25, 26 provide springs 27, 2 in the barrel.
Spools 29 and 30 which slide against 8 are provided, and a bypass circuit 21 and a check valve 22 of one electromagnetic proportional pressure reducing valve 19 are directly connected to the pump housing P 1 and the actuator port A 1 in the valve housing 23. I decided to provide it. The check valve 22 may be attached to the outside of the valve housing 23 so as to connect the ports A 1 and P 1 without being installed in the valve housing 23 as shown in FIG.
【００１１】該パイロット回路１４の２次回路１４ａと
１次回路１４ｂをチェック弁２２を備えたバイパス回路
２１で結んでおくことにより、該電磁比例減圧弁１９が
コントローラ１８から減速の指令を受けている状態であ
っても、該減圧弁（ジョイスティック弁）を中立位置に
操作すれば、１次回路１４ｂの圧力がタンク圧となると
同時に２次回路１４ａの圧力も該バイパス回路２１及び
チェック弁２２を介して１次回路１４ｂへと排出され
て、図３の右側に示すように、わずかな時間ｔの遅れで
タンク圧となり、これによりコントロールバルブ１０を
中立位置に移動させてシリンダ７が停止するから、バケ
ット３の上方への動きが急停止し、運転席２との干渉が
防げる。By connecting the secondary circuit 14a and the primary circuit 14b of the pilot circuit 14 with a bypass circuit 21 having a check valve 22, the electromagnetic proportional pressure reducing valve 19 receives a deceleration command from the controller 18. Even when the pressure reducing valve (joystick valve) is operated to the neutral position, the pressure in the primary circuit 14b becomes the tank pressure and the pressure in the secondary circuit 14a also changes the bypass circuit 21 and the check valve 22. It is discharged to the primary circuit 14b via the tank and becomes tank pressure with a slight delay of time t as shown on the right side of FIG. 3, whereby the control valve 10 is moved to the neutral position and the cylinder 7 is stopped. Then, the upward movement of the bucket 3 is suddenly stopped, and the interference with the driver's seat 2 can be prevented.
【００１２】[0012]
【発明の効果】以上のように本発明によるときは、バケ
ットと運転席の位置関係を検知するコントローラにより
制御された電磁比例減圧弁を備えたコントロールバルブ
へのパイロット回路に、該電磁比例減圧弁の２次回路と
１次回路をバイパス回路で直結し、該２次回路から１次
回路へチェック弁により圧力を排除するようにしたの
で、該電磁比例減圧弁がコントローラにより制御されて
いる間でも該パイロット回路の減圧弁を操作してバケッ
トの動きを急停止させることができて安全性が向上し、
その構成も簡単で安価に製作できる等の効果がある。As described above, according to the present invention, in the pilot circuit to the control valve having the electromagnetic proportional pressure reducing valve controlled by the controller for detecting the positional relationship between the bucket and the driver's seat, the electromagnetic proportional pressure reducing valve is provided. The secondary circuit and the primary circuit are directly connected by the bypass circuit, and the pressure is removed from the secondary circuit to the primary circuit by the check valve. Therefore, even while the electromagnetic proportional pressure reducing valve is controlled by the controller. By operating the pressure reducing valve of the pilot circuit, the movement of the bucket can be suddenly stopped, and safety is improved,
Its structure is also simple, and there is an effect that it can be manufactured at low cost.
【図１】 本発明の実施例の装置の線図FIG. 1 is a schematic diagram of an apparatus according to an embodiment of the present invention.
【図２】 図１の電磁比例減圧弁の具体的構成の断面図FIG. 2 is a sectional view of a specific configuration of the electromagnetic proportional pressure reducing valve of FIG.
【図３】 図１の装置によるパイロット回路の排圧時間
の説明図FIG. 3 is an explanatory diagram of the exhaust pressure time of the pilot circuit by the device of FIG.
【符号の説明】 １ 作業機、 ２ 運転席、３
バケット、 ４、５ ブーム、６
アーム、 ７、８、９ シリンダ、１
０、１１ コントロールバルブ、 １２ メイ
ンポンプ、１３ パイロットポンプ、 １４、１５
パイロット回路、１４ａ ２次回路、
１４ｂ １次回路、１６、１７ 減圧弁、
１８ コントローラ、１９、２０ 電磁
比例減圧弁、 ２１ バイパス回路、２２
チェック弁、 ２３ 弁筺[Explanation of symbols] 1 work machine, 2 driver's seat, 3
Bucket, 4,5 boom, 6
Arm, 7, 8, 9 cylinder, 1
0, 11 control valve, 12 main pump, 13 pilot pump, 14, 15
Pilot circuit, 14a secondary circuit,
14b Primary circuit, 16, 17 Pressure reducing valve,
18 controller, 19, 20 electromagnetic proportional pressure reducing valve, 21 bypass circuit, 22
Check valve, 23 valve box
Claims (3)
ルバルブを介して作業機のバケットを駆動するシリンダ
へ供給し、該コントロールバルブの作動を、減圧弁で制
御したパイロットポンプからのパイロット回路の流体圧
力で制御すると共に該バケットの該作業機の運転席との
位置関係を検知するコントローラの電気信号によって作
動する該パイロット回路の該減圧弁とコントロールバル
ブ間に設けた電磁比例減圧弁で制御する干渉防止制御回
路装置に於いて、該パイロット回路のコントロールバル
ブと電磁比例減圧弁の間の２次回路を該パイロット回路
の該減圧弁と該電磁比例減圧弁の間の１次回路に直結す
るバイパス回路を設け、該バイパス回路に該２次回路か
ら１次回路へのフリーフローを許容するチェック弁を設
けたことを特徴とする作業機の干渉防止制御回路装置。1. Hydraulic fluid from a main pump is supplied through a control valve to a cylinder that drives a bucket of a working machine, and the operation of the control valve is controlled by a pressure reducing valve. Control by an electromagnetic proportional pressure reducing valve provided between the pressure reducing valve and the control valve of the pilot circuit operated by an electric signal of a controller that detects the positional relationship between the bucket and the driver's seat of the working machine. In the control circuit device, a bypass circuit for directly connecting a secondary circuit between the control valve of the pilot circuit and the electromagnetic proportional pressure reducing valve to a primary circuit between the pressure reducing valve of the pilot circuit and the electromagnetic proportional pressure reducing valve is provided. And a check valve for allowing free flow from the secondary circuit to the primary circuit in the bypass circuit. Interference prevention control circuit device for working machines.
駆動され、各シリンダは複数個のコントロールバルブに
より夫々上記メインポンプからの作動油の供給を受け、
各コントロールバルブの作動を夫々の減圧弁で制御した
上記パイロットポンプから分岐した複数のパイロット回
路の流体圧力で制御すると共に各パイロット回路の減圧
弁とコントロールバルブ間に夫々上記電磁比例減圧弁を
設け、各パイロット回路の少なくとも１つに上記チェッ
ク弁を備えたバイパス回路を設けたことを特徴とする請
求項１に記載の作業機の干渉防止制御回路装置。2. The bucket is driven by a plurality of cylinders, and each cylinder receives a supply of hydraulic oil from the main pump by a plurality of control valves.
The operation of each control valve is controlled by the fluid pressure of a plurality of pilot circuits branched from the pilot pump controlled by each pressure reducing valve, and each electromagnetic proportional pressure reducing valve is provided between the pressure reducing valve of each pilot circuit and the control valve. The interference prevention control circuit device for a working machine according to claim 1, wherein a bypass circuit including the check valve is provided in at least one of the pilot circuits.
記電磁比例減圧弁の弁筺内に設けたことを特徴とする請
求項１に記載の作業機の干渉防止制御回路装置。3. The interference prevention control circuit device for a working machine according to claim 1, wherein the bypass circuit and the check valve are provided in a valve housing of the electromagnetic proportional pressure reducing valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7273850A JP3016004B2 (en) | 1995-10-23 | 1995-10-23 | Work machine interference prevention control circuit device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7273850A JP3016004B2 (en) | 1995-10-23 | 1995-10-23 | Work machine interference prevention control circuit device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09111799A true JPH09111799A (en) | 1997-04-28 |
| JP3016004B2 JP3016004B2 (en) | 2000-03-06 |
Family
ID=17533428
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7273850A Expired - Fee Related JP3016004B2 (en) | 1995-10-23 | 1995-10-23 | Work machine interference prevention control circuit device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3016004B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433902A (en) * | 2011-12-27 | 2012-05-02 | 山重建机有限公司 | Electric hydraulic excvavtor |
| JP2018054031A (en) * | 2016-09-29 | 2018-04-05 | 日立建機株式会社 | Hydraulic control device for work vehicle |
-
1995
- 1995-10-23 JP JP7273850A patent/JP3016004B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102433902A (en) * | 2011-12-27 | 2012-05-02 | 山重建机有限公司 | Electric hydraulic excvavtor |
| JP2018054031A (en) * | 2016-09-29 | 2018-04-05 | 日立建機株式会社 | Hydraulic control device for work vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3016004B2 (en) | 2000-03-06 |
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