JPH09279638A - Control circuit of hydraulic shovel - Google Patents
Control circuit of hydraulic shovelInfo
- Publication number
- JPH09279638A JPH09279638A JP9553696A JP9553696A JPH09279638A JP H09279638 A JPH09279638 A JP H09279638A JP 9553696 A JP9553696 A JP 9553696A JP 9553696 A JP9553696 A JP 9553696A JP H09279638 A JPH09279638 A JP H09279638A
- Authority
- JP
- Japan
- Prior art keywords
- control valve
- boom
- directional control
- oil passage
- pilot signal
- 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
Landscapes
- Operation Control Of Excavators (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は油圧ショベルの制御
回路に関するものであり、特に、複数の油圧ポンプに夫
々センタバイパス油路とパラレル油路を設けて各方向制
御弁を適宜配設した油圧ショベルの制御回路に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit for a hydraulic excavator, and more particularly to a hydraulic excavator in which a plurality of hydraulic pumps are provided with a center bypass oil passage and a parallel oil passage, respectively, and each directional control valve is appropriately arranged. The present invention relates to the control circuit.
【０００２】[0002]
【従来の技術】従来の油圧ショベルの制御回路の一例を
図５に示す。第１及び第２の油圧ポンプ１，２に夫々セ
ンタバイパス油路３，４とパラレル油路５，６とを平行
に設け、第１の油圧ポンプ１側のセンタバイパス油路３
に旋回モータ７用の方向制御弁８並びにアームシリンダ
９用の方向制御弁１０をポンプ下流に向けてタンデム接
続するとともに、パラレル油路５を介して前記旋回モー
タ用の方向制御弁８及びアームシリンダ用の１０をパラ
レル接続する。一方、第２の油圧ポンプ２側にはブーム
シリンダ１１用の方向制御弁１２や他のアクチュエータ
（例えばバケットシリンダ）用の方向制御弁１３等を適
宜配設する。2. Description of the Related Art An example of a conventional hydraulic excavator control circuit is shown in FIG. Center bypass oil passages 3 and 4 and parallel oil passages 5 and 6 are provided in parallel in the first and second hydraulic pumps 1 and 2, respectively, and the center bypass oil passage 3 on the first hydraulic pump 1 side is provided.
The directional control valve 8 for the swing motor 7 and the directional control valve 10 for the arm cylinder 9 are connected in tandem toward the pump downstream, and the directional control valve 8 for the swing motor and the arm cylinder are connected via the parallel oil passage 5. 10 for parallel connection. On the other hand, on the second hydraulic pump 2 side, a directional control valve 12 for the boom cylinder 11, a directional control valve 13 for another actuator (for example, a bucket cylinder), and the like are appropriately arranged.
【０００３】また、押し付け掘削時に旋回モータ７の押
し付け力を確保するため、パラレル油路５には、旋回モ
ータ用の方向制御弁８の下流且つアームシリンダ用の方
向制御弁１０の上流位置に絞り１４を設けてある。更
に、ダンプ積み作業時にサイクルタイムを短縮するた
め、センタバイパス油路３には、旋回モータ用の方向制
御弁８の上流位置にブーム速度切替弁１５を設けてあ
る。Further, in order to secure the pressing force of the swing motor 7 during push excavation, the parallel oil passage 5 is throttled to a position downstream of the direction control valve 8 for the swing motor and upstream of the direction control valve 10 for the arm cylinder. 14 is provided. Further, in order to shorten the cycle time during dump loading, a boom speed switching valve 15 is provided in the center bypass oil passage 3 at a position upstream of the directional control valve 8 for the swing motor.
【０００４】即ち、センタバイパス油路３によりブーム
速度切替弁１５と旋回モータ用の方向制御弁８並びにア
ームシリンダ用の方向制御弁１０がタンデム接続される
とともに、パラレル油路５を介して前記ブーム速度切替
弁１５と旋回モータ用の方向制御弁８並びにアームシリ
ンダ用の方向制御弁１０がパラレル接続された状態にな
っている。That is, the boom speed switching valve 15, the directional control valve 8 for the swing motor, and the directional control valve 10 for the arm cylinder are tandem-connected by the center bypass oil passage 3, and the boom is also connected via the parallel oil passage 5. The speed switching valve 15, the directional control valve 8 for the swing motor, and the directional control valve 10 for the arm cylinder are connected in parallel.
【０００５】そして、ブームシリンダ用の方向制御弁１
２に作用するブーム上げパイロット信号圧Ｐ1 に応じて
該ブーム速度切替弁１５を１５ｂの位置へ切り替え、第
１の油圧ポンプ１の圧力油を分岐して油路１６からブー
ムシリンダ用の方向制御弁１２へ合流させることによ
り、ブーム上げ速度が上昇するように構成されている。The directional control valve 1 for the boom cylinder
The boom speed switching valve 15 is switched to the position of 15b according to the boom raising pilot signal pressure P 1 acting on 2, and the pressure oil of the first hydraulic pump 1 is branched to control the direction of the boom cylinder from the oil passage 16. The boom raising speed is increased by merging with the valve 12.
【０００６】ここで、油圧ショベルにて床掘り作業をす
る場合、図６に示すように、アーム１７の閉じ操作とブ
ーム１８の上げ操作とを同時に行ってバケット１９を矢
印方向へ水平引きする。このとき、アーム１７は自重で
落下する方向へ付勢されるのでアーム閉じ速度が速くな
るとともに、ブーム１８は持ち上げられるためブーム上
げ速度が遅くなる傾向がある。Here, when performing floor digging work with a hydraulic excavator, as shown in FIG. 6, the operation of closing the arm 17 and the operation of raising the boom 18 are simultaneously performed to horizontally pull the bucket 19 in the direction of the arrow. At this time, the arm 17 is urged by its own weight in the direction of falling, so that the arm closing speed increases, and the boom 18 is lifted, so the boom raising speed tends to decrease.
【０００７】図５に示した従来の制御回路では、床掘り
作業に於いてブーム上げ操作を行うと、ブーム上げパイ
ロット信号圧Ｐ1 によりブームシリンダ用の方向制御弁
１２が１２ｂの位置に切り替わるとともにブーム速度切
替弁１５が１５ｂの位置に切り替わり、ブームシリンダ
１１へ供給される圧力油の流量が増加する。また、第１
の油圧ポンプ１の圧力油はパラレル油路５を経てアーム
シリンダ用の方向制御弁１０にも供給されるが、パラレ
ル油路５に絞り弁１４を介装してあるため、アームシリ
ンダ９へ供給される圧力油の流量が制限される。In the conventional control circuit shown in FIG. 5, when the boom raising operation is performed in the floor digging work, the directional control valve 12 for the boom cylinder is switched to the position 12b by the boom raising pilot signal pressure P 1. The boom speed switching valve 15 switches to the position of 15b, and the flow rate of the pressure oil supplied to the boom cylinder 11 increases. Also, the first
The pressure oil of the hydraulic pump 1 is also supplied to the directional control valve 10 for the arm cylinder via the parallel oil passage 5, but is supplied to the arm cylinder 9 because the throttle valve 14 is provided in the parallel oil passage 5. The flow rate of pressure oil that is applied is limited.
【０００８】従って、ブーム上げ操作中は、ブーム上げ
速度が上昇するとともにアーム閉じ速度が低下するよう
に制御され、アーム１７の落ち込みによるバケット１９
の食い込みを防止している。Therefore, during the boom raising operation, it is controlled so that the boom raising speed increases and the arm closing speed decreases, and the bucket 19 due to the fall of the arm 17 is controlled.
It prevents the bite of.
【０００９】[0009]
【発明が解決しようとする課題】従来、図６に示すよう
な床掘り作業をする場合は、前述したように、ブーム上
げ操作中は、ブーム上げ速度を上昇させるとともにアー
ム閉じ速度を低下させるように制御している。そして、
オペーレータはバケット１９が機体に近づくに従ってブ
ーム１８の上げ操作を遅くし、図７の姿勢に至った後に
は、ブーム１８を下げ操作する。Conventionally, when performing floor digging work as shown in FIG. 6, as described above, during boom raising operation, the boom raising speed is increased and the arm closing speed is decreased. Have control over. And
The operator delays the raising operation of the boom 18 as the bucket 19 approaches the machine body, and lowers the boom 18 after reaching the posture shown in FIG. 7.
【００１０】ブーム１８を上げ操作から下げ操作へ切り
替えたときは、図５に示した前記ブーム速度切替弁１５
が１５ｂから１５ａの位置に復帰し、センタバイパス油
路３が開放されるため、アームシリンダ９へ供給される
圧力油の流量が急増する。従って、アーム閉じ速度が急
激に上昇することになり、それに対応してブーム下げ操
作を調整しなければならず、オペーレータには高度の技
術と労力が必要とされていた。When the boom 18 is switched from the raising operation to the lowering operation, the boom speed switching valve 15 shown in FIG.
Returns to the position of 15a from 15b and the center bypass oil passage 3 is opened, so that the flow rate of the pressure oil supplied to the arm cylinder 9 sharply increases. Therefore, the arm closing speed rapidly increases, and the boom lowering operation must be adjusted correspondingly, which requires a high level of skill and labor for the operator.
【００１１】そこで、油圧ショベルにて床掘り作業を行
う場合に、ブーム上げ操作及び下げ操作に対応して最適
なアーム閉じ速度が得られるようにするために解決すべ
き技術的課題が生じてくるのであり、本発明はこの課題
を解決することを目的とする。Therefore, when performing floor digging work with a hydraulic excavator, there arises a technical problem to be solved in order to obtain an optimum arm closing speed corresponding to the boom raising operation and the boom lowering operation. Therefore, an object of the present invention is to solve this problem.
【００１２】[0012]
【課題を解決するための手段】本発明は上記目的を達成
するために提案されたものであり、第１の油圧ポンプ側
のセンタバイパス油路にブーム速度切替弁と旋回モータ
用の方向制御弁並びにアームシリンダ用の方向制御弁を
ポンプ下流に向けてタンデム接続するとともに、該セン
タバイパス油路から平行に分岐されたパラレル油路を介
して前記ブーム速度切替弁と旋回モータ用の方向制御弁
並びにアームシリンダ用の方向制御弁をパラレル接続
し、更に、第２の油圧ポンプ側にブームシリンダ用の方
向制御弁をはじめとする他の制御弁を適宜配設し、ブー
ム上げパイロット信号圧に応じて前記ブーム速度切替弁
から第１の油圧ポンプの圧力油を分岐してブームシリン
ダ用の方向制御弁へ合流させる油路を設けた油圧ショベ
ルの制御回路に於いて、前記第１の油圧ポンプのパラレ
ル油路の下流であって、旋回モータ用の方向制御弁の下
流且つアームシリンダ用の方向制御弁の上流位置に電磁
比例流量制御弁を介装し、更に、ブームシリンダ用の方
向制御弁に作用するブーム上げパイロット信号圧を検出
する手段を設け、該ブーム上げパイロット信号圧が上昇
傾向にあるときは、コントローラにより前記電磁比例流
量制御弁の開口面積を最小にし、該ブーム上げパイロッ
ト信号圧が下降傾向にあるときは、コントローラにより
前記電磁比例流量制御弁の開口面積を該ブーム上げパイ
ロット信号圧に応じて拡開する油圧ショベルの制御回
路、及び、第１の油圧ポンプ側のセンタバイパス油路に
ブーム速度切替弁と旋回モータ用の方向制御弁並びにア
ームシリンダ用の方向制御弁をポンプ下流に向けてタン
デム接続するとともに、該センタバイパス油路から平行
に分岐されたパラレル油路を介して前記ブーム速度切替
弁と旋回モータ用の方向制御弁並びにアームシリンダ用
の方向制御弁をパラレル接続し、更に、第２の油圧ポン
プ側にブームシリンダ用の方向制御弁をはじめとする他
の制御弁を適宜配設し、ブーム上げパイロット信号圧に
応じて前記ブーム速度切替弁から第１の油圧ポンプの圧
力油を分岐してブームシリンダ用の方向制御弁へ合流さ
せる油路を設けた油圧ショベルの制御回路に於いて、前
記第１の油圧ポンプのパラレル油路の下流であって、旋
回モータ用の方向制御弁の下流且つアームシリンダ用の
方向制御弁の上流位置に電磁比例流量制御弁を介装し、
更に、旋回モータ用の方向制御弁に作用する旋回パイロ
ット信号圧を検出する手段を設け、該旋回パイロット信
号圧を検出したときは、コントローラにより前記電磁比
例流量制御弁の開口面積を最小にする油圧ショベルの制
御回路を提供するものである。The present invention has been proposed in order to achieve the above-mentioned object, and a boom speed switching valve and a directional control valve for a swing motor are provided in a center bypass oil passage on the side of a first hydraulic pump. In addition, the directional control valve for the arm cylinder is connected in tandem toward the downstream of the pump, and the boom speed switching valve and the directional control valve for the swing motor are connected via a parallel oil passage branched in parallel from the center bypass oil passage. The directional control valves for the arm cylinders are connected in parallel, and other control valves such as the directional control valve for the boom cylinder are appropriately arranged on the second hydraulic pump side, depending on the boom raising pilot signal pressure. In a control circuit of a hydraulic excavator provided with an oil passage for branching the pressure oil of the first hydraulic pump from the boom speed switching valve to join the directional control valve for the boom cylinder. An electromagnetic proportional flow control valve is provided downstream of the parallel oil passage of the first hydraulic pump, downstream of the directional control valve for the swing motor and upstream of the directional control valve for the arm cylinder, and A means for detecting the boom raising pilot signal pressure acting on the directional control valve for the boom cylinder is provided, and when the boom raising pilot signal pressure tends to rise, the controller minimizes the opening area of the electromagnetic proportional flow control valve. A control circuit of the hydraulic excavator for expanding the opening area of the electromagnetic proportional flow rate control valve according to the boom raising pilot signal pressure by the controller when the boom raising pilot signal pressure tends to decrease; The boom speed switching valve, the directional control valve for the swing motor, and the directional control valve for the arm cylinder are installed under the pump in the center bypass oil passage on the hydraulic pump side. The boom speed switching valve, the directional control valve for the swing motor, and the directional control valve for the arm cylinder in parallel via a parallel oil passage branched in parallel from the center bypass oil passage. Further, other control valves such as a directional control valve for the boom cylinder are appropriately disposed on the second hydraulic pump side, and the boom speed switching valve is connected to the first hydraulic pump according to the boom raising pilot signal pressure. In a control circuit of a hydraulic excavator provided with an oil passage for branching off the pressure oil of the first hydraulic pump and joining it to a directional control valve for a boom cylinder, the control circuit for a swing motor is provided downstream of the parallel oil passage of the first hydraulic pump. An electromagnetic proportional flow control valve is provided downstream of the directional control valve and upstream of the directional control valve for the arm cylinder,
Further, means for detecting the swing pilot signal pressure acting on the directional control valve for the swing motor is provided, and when the swing pilot signal pressure is detected, a hydraulic pressure for minimizing the opening area of the electromagnetic proportional flow control valve by the controller. A shovel control circuit is provided.
【００１３】[0013]
【発明の実施の形態】以下、本発明の実施の形態を図面
に従って詳述する。尚、説明の都合上、従来と同一構成
部分には同一符号を付してその説明を省略する。Embodiments of the present invention will be described below in detail with reference to the drawings. For convenience of explanation, the same reference numerals are given to the same components as those in the related art, and the description is omitted.
【００１４】図１は油圧ショベルの制御回路の一例を示
し、第１の油圧ポンプ１のパラレル油路５には、旋回モ
ータ用の方向制御弁８の下流且つアームシリンダ用の方
向制御弁１０の上流位置に電磁比例流量制御弁２０を介
装する。該電磁比例流量制御弁２０のソレノイドにはコ
ントローラ２１からの信号線２２が接続され、コントロ
ーラ２１の指令信号により電磁比例流量制御弁２０の開
口面積が変化する。FIG. 1 shows an example of a control circuit for a hydraulic excavator. In a parallel oil passage 5 of a first hydraulic pump 1, a directional control valve 10 for arm cylinders is provided downstream of a directional control valve 8 for a swing motor. An electromagnetic proportional flow control valve 20 is installed at the upstream position. A signal line 22 from a controller 21 is connected to the solenoid of the electromagnetic proportional flow control valve 20, and the opening area of the electromagnetic proportional flow control valve 20 changes according to a command signal from the controller 21.
【００１５】また、旋回モータ用の方向制御弁８に作用
する左右の旋回パイロット信号圧をシャトル弁２３で高
圧選択するとともに、該シャトル弁２３で選択された旋
回パイロット信号圧Ｐ2 の有無を検出する圧力スイッチ
２４を設ける。この圧力スイッチ２４の検出信号は信号
線２５により前記コントローラ２１へ送られる。The left and right swing pilot signal pressures acting on the direction control valve 8 for the swing motor are selected by the shuttle valve 23 to be high pressure, and the presence or absence of the swing pilot signal pressure P 2 selected by the shuttle valve 23 is detected. A pressure switch 24 is provided. The detection signal of the pressure switch 24 is sent to the controller 21 via a signal line 25.
【００１６】更に、ブームシリンダ用の方向制御弁１２
に作用するブーム上げパイロット信号圧Ｐ1 を検出する
圧力センサ２６を設け、この圧力センサ２６の検出信号
は信号線２７により前記コントローラ２１へ送られる。Further, the directional control valve 12 for the boom cylinder 12
A pressure sensor 26 for detecting the boom raising pilot signal pressure P 1 that acts on the pressure sensor 26 is provided, and the detection signal of the pressure sensor 26 is sent to the controller 21 by a signal line 27.
【００１７】而して、当該油圧ショベルにて床掘り作業
をする場合、図６に示したように、アーム１７の閉じ操
作とブーム１８の上げ操作とを同時に行ってバケット１
９を矢印方向へ水平引きする。このとき、図２に示すよ
うに、ブーム上げパイロット信号圧Ｐ1 によりブームシ
リンダ用の方向制御弁１２が１２ｂの位置に切り替わる
とともにブーム速度切替弁１５が１５ｂの位置に切り替
わり、第１の油圧ポンプ１の圧力油が油路１６からブー
ムシリンダ用の方向制御弁１２へ合流し、ブームシリン
ダ１１への流量が増加してブーム上げ速度が上昇する。Thus, when performing floor digging work with the hydraulic excavator, as shown in FIG. 6, the operation of closing the arm 17 and the operation of raising the boom 18 are simultaneously performed, and the bucket 1 is operated.
Pull 9 horizontally in the direction of the arrow. At this time, as shown in FIG. 2, the boom cylinder pilot control signal pressure P 1 switches the directional control valve 12 for the boom cylinder to the position 12b, and the boom speed switching valve 15 switches to the position 15b. The pressure oil of No. 1 merges from the oil passage 16 to the directional control valve 12 for the boom cylinder, the flow rate to the boom cylinder 11 increases, and the boom raising speed increases.
【００１８】また、前記圧力センサ２６によりブーム上
げパイロット信号圧Ｐ1 が検出されてコントローラ２１
へ送られる。コントローラ２１はブーム上げパイロット
信号圧Ｐ1 の変化の傾向を読み取り、ブーム上げパイロ
ット信号圧Ｐ1 が上昇傾向にあるときは、電磁比例流量
制御弁２０の開口面積を最小にすべく、コントローラ２
１から信号線２２を介して電磁比例流量制御弁２０へ指
令信号を送る。The pressure sensor 26 detects the boom raising pilot signal pressure P 1 and the controller 21
Sent to The controller 21 reads the trend of change in the boom raising pilot signal pressure P 1, when the boom raising pilot signal pressure P 1 tends to increase, in order to the opening area of solenoid proportional flow control valve 20 to a minimum, the controller 2
A command signal is sent from 1 to the electromagnetic proportional flow control valve 20 via the signal line 22.
【００１９】このため、第１の油圧ポンプ１からパラレ
ル油路５へ導出された圧力油は、該電磁比例流量制御弁
２０により流量が制限される。従って、ブーム上げ操作
の初期には、従来と同様にブーム上げ速度が上昇すると
ともにアーム閉じ速度が低下するように制御される。Therefore, the flow rate of the pressure oil led from the first hydraulic pump 1 to the parallel oil passage 5 is limited by the electromagnetic proportional flow rate control valve 20. Therefore, in the initial stage of the boom raising operation, the boom raising speed is increased and the arm closing speed is reduced as in the conventional case.
【００２０】そして、バケット１９が機体に近づくに従
ってブーム上げ操作を遅くすると、ブーム上げパイロッ
ト信号圧Ｐ1 が減少していく。このとき、コントローラ
２１では、前記圧力センサ２６の検出値によりブーム上
げパイロット信号圧Ｐ1 が下降傾向にあることがわか
る。ブーム上げパイロット信号圧Ｐ1 が下降傾向にある
ときは、コントローラ２１は電磁比例流量制御弁２０の
開口面積をブーム上げパイロット信号圧Ｐ1 に応じて拡
開すべく、信号線２２を介して電磁比例流量制御弁２０
へ指令信号を送る。When the boom raising operation is delayed as the bucket 19 approaches the machine body, the boom raising pilot signal pressure P 1 decreases. At this time, in the controller 21, it is understood from the detection value of the pressure sensor 26 that the boom raising pilot signal pressure P 1 tends to decrease. When the boom raising pilot signal pressure P 1 is decreasing, the controller 21 uses the signal line 22 to open the opening area of the electromagnetic proportional flow control valve 20 according to the boom raising pilot signal pressure P 1. Proportional flow control valve 20
Send a command signal to.
【００２１】従って、電磁比例流量制御弁２０の開口面
積が徐々に大となるが、従来のように、アームシリンダ
９へ供給される圧力油の流量が急増しないので、アーム
１７の閉じ速度は徐々に上昇していき、ブーム上げ操作
の調整が容易となってオペレータの負担を軽減できる。Therefore, the opening area of the electromagnetic proportional flow control valve 20 gradually increases, but unlike the conventional case, the flow rate of the pressure oil supplied to the arm cylinder 9 does not increase sharply, so the closing speed of the arm 17 is gradually increased. Then, the boom lifting operation can be adjusted easily, and the operator's burden can be reduced.
【００２２】更に、図７の姿勢に至った後にはブーム１
８を下げ操作するので、図３に示すように、ブームシリ
ンダ用の方向制御弁１２が１２ａの位置に切り替わると
ともに、ブーム上げパイロット信号圧Ｐ1 がなくなって
ブーム速度切替弁１５が１５ａの位置に復帰する。ま
た、コントローラ２１はブーム上げパイロット信号圧Ｐ
1 がなくなったときは、電磁比例流量制御弁２０の開口
面積を最大にすべく、信号線２２を介して電磁比例流量
制御弁２０へ指令信号を送る。Furthermore, after reaching the posture shown in FIG. 7, the boom 1
8 to lower the boom, as shown in Fig. 3,
When the directional control valve 12 for the vehicle switches to the position 12a
Both, boom raising pilot signal pressure P1Is gone
The boom speed switching valve 15 returns to the position of 15a. Ma
Also, the controller 21 controls the boom raising pilot signal pressure P.
1When there is no longer, the opening of the electromagnetic proportional flow control valve 20
Electromagnetic proportional flow rate via signal line 22 to maximize area
A command signal is sent to the control valve 20.
【００２３】従って、前記電磁比例流量制御弁２０が全
開状態となるが、前述したように、電磁比例流量制御弁
２０の開口面積は徐々に拡開されているので、アーム１
７の閉じ速度が急激に変化することはなく、ブーム下げ
操作の調整も容易となる。Therefore, the electromagnetic proportional flow rate control valve 20 is fully opened, but as described above, since the opening area of the electromagnetic proportional flow rate control valve 20 is gradually expanded, the arm 1 is opened.
The closing speed of 7 does not change suddenly, and the boom lowering operation can be easily adjusted.
【００２４】一方、押し付け掘削作業をする場合は、バ
ケット１９による掘削操作と同時に旋回モータ７を駆動
して機体を旋回操作する。図４に示すように、ブーム上
げ操作とアーム閉じ操作を行いつつ旋回操作を開始すれ
ば、旋回モータ用の方向制御弁８に作用する左右の旋回
パイロット信号圧がシャトル弁２３で高圧選択され、こ
の高圧選択された旋回パイロット信号圧Ｐ2 が圧力スイ
ッチ２４により検出されてコントローラ２１へ送られ
る。On the other hand, in the case of performing the pressing excavation work, the swing motor 7 is driven simultaneously with the excavation operation by the bucket 19 to rotate the machine body. As shown in FIG. 4, when the swing operation is started while performing the boom raising operation and the arm closing operation, the left and right swing pilot signal pressures acting on the directional control valve 8 for the swing motor are selected by the shuttle valve 23 to be high pressure, The high-pressure selected turning pilot signal pressure P 2 is detected by the pressure switch 24 and sent to the controller 21.
【００２５】コントローラ２１は旋回パイロット信号圧
Ｐ2 が検出されたときは、前記電磁比例流量制御弁２０
の開口面積を最小にすべく、コントローラ２１から信号
線２２を介して電磁比例流量制御弁２０へ指令信号を送
る。従って、旋回モータ用の方向制御弁８及びブームシ
リンダ用の方向制御弁１２への流量が多くなり、旋回モ
ータ７の押し付け力及びブーム１８の上げ速度が確保さ
れて、押し付け掘削作業を円滑に行うことができる。When the turning pilot signal pressure P 2 is detected, the controller 21 controls the electromagnetic proportional flow control valve 20.
A command signal is sent from the controller 21 to the electromagnetic proportional flow control valve 20 via the signal line 22 in order to minimize the opening area. Therefore, the flow rate to the directional control valve 8 for the swing motor and the directional control valve 12 for the boom cylinder is increased, the pushing force of the swing motor 7 and the raising speed of the boom 18 are secured, and the push excavation work is smoothly performed. be able to.
【００２６】また、従来の制御回路では絞り１４で圧力
損失が生じ、この圧力損失による発熱でエネルギーロス
が大きかったが、本発明の制御回路では電磁比例流量制
御弁２０を設けたことにより、ブーム上げ下げの操作量
に応じて開口面積が調整され、ここでの圧力損失が解消
されてエネルギーを効率よく消費できる。Further, in the conventional control circuit, pressure loss occurs in the throttle 14, and heat generation due to this pressure loss causes a large energy loss. However, in the control circuit of the present invention, the electromagnetic proportional flow rate control valve 20 is provided, so that the boom is increased. The opening area is adjusted according to the operation amount of raising and lowering, the pressure loss here is eliminated, and energy can be efficiently consumed.
【００２７】尚、本発明は、本発明の精神を逸脱しない
限り種々の改変を為すことができ、そして、本発明が該
改変されたものに及ぶことは当然である。The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones.
【００２８】[0028]
【発明の効果】以上説明したように、本発明ではパラレ
ル油路のアームシリンダ用の方向制御弁の上流位置に電
磁比例流量制御弁を設け、ブーム上げパイロット信号圧
に応じて該電磁比例流量制御弁の開口面積を調整するよ
うにしたので、ブーム上げ操作及び下げ操作に対応して
最適なアーム閉じ速度が得られる。As described above, according to the present invention, the electromagnetic proportional flow rate control valve is provided at the upstream position of the directional control valve for the arm cylinder of the parallel oil passage, and the electromagnetic proportional flow rate control is performed according to the boom raising pilot signal pressure. Since the opening area of the valve is adjusted, the optimum arm closing speed can be obtained corresponding to the boom raising operation and the boom lowering operation.
【００２９】依って、油圧ショベルでの床掘り作業の操
作性が著しく向上し、オペレータの負担を軽減すること
が可能となる。Therefore, the operability of the floor excavation work with the hydraulic excavator is remarkably improved, and the burden on the operator can be reduced.
【図１】本発明の実施の形態を示し、ブーム操作を行っ
ていないときの油圧ショベルの制御回路図。FIG. 1 is a control circuit diagram of a hydraulic excavator when a boom operation is not performed, showing an embodiment of the present invention.
【図２】床掘り作業でブーム上げ操作中の油圧ショベル
の制御回路図。FIG. 2 is a control circuit diagram of the hydraulic excavator during a boom raising operation in floor digging work.
【図３】床掘り作業でブーム下げ操作中の油圧ショベル
の制御回路図。FIG. 3 is a control circuit diagram of the hydraulic excavator during a boom lowering operation in floor digging work.
【図４】押し付け掘削作業でブーム下げ操作中の油圧シ
ョベルの制御回路図。FIG. 4 is a control circuit diagram of the hydraulic excavator during the boom lowering operation in the pressing excavation work.
【図５】従来の油圧ショベルの制御回路図。FIG. 5 is a control circuit diagram of a conventional hydraulic excavator.
【図６】床掘り作業初期段階の油圧ショベルの側面図。FIG. 6 is a side view of the hydraulic excavator at an initial stage of floor digging work.
【図７】床掘り作業中間段階の油圧ショベルの側面図。FIG. 7 is a side view of the hydraulic excavator at an intermediate stage of floor digging work.
１，２ 油圧ポンプ ３，４ センタバイパス油路 ５，６ パラレル油路 ７ 旋回モータ ８ 方向制御弁 ９ アームシリンダ １０ 方向制御弁 １１ ブームシリンダ １２ 方向制御弁 １５ ブーム速度切替弁 １６ 油路 ２０ 電磁比例流量制御弁 ２１ コントローラ ２４ 圧力スイッチ ２６ 圧力センサ Ｐ1 ブーム上げパイロット信号圧 Ｐ2 旋回パイロット信号圧1, 2 Hydraulic pump 3, 4 Center bypass oil passage 5, 6 Parallel oil passage 7 Swing motor 8 Directional control valve 9 Arm cylinder 10 Directional control valve 11 Boom cylinder 12 Directional control valve 15 Boom speed switching valve 16 Oil passage 20 Electromagnetic proportional Flow control valve 21 Controller 24 Pressure switch 26 Pressure sensor P 1 Boom lift pilot signal pressure P 2 Swing pilot signal pressure
Claims (2)
路にブーム速度切替弁と旋回モータ用の方向制御弁並び
にアームシリンダ用の方向制御弁をポンプ下流に向けて
タンデム接続するとともに、該センタバイパス油路から
平行に分岐されたパラレル油路を介して前記ブーム速度
切替弁と旋回モータ用の方向制御弁並びにアームシリン
ダ用の方向制御弁をパラレル接続し、更に、第２の油圧
ポンプ側にブームシリンダ用の方向制御弁をはじめとす
る他の制御弁を適宜配設し、ブーム上げパイロット信号
圧に応じて前記ブーム速度切替弁から第１の油圧ポンプ
の圧力油を分岐してブームシリンダ用の方向制御弁へ合
流させる油路を設けた油圧ショベルの制御回路に於い
て、前記第１の油圧ポンプのパラレル油路の下流であっ
て、旋回モータ用の方向制御弁の下流且つアームシリン
ダ用の方向制御弁の上流位置に電磁比例流量制御弁を介
装し、更に、ブームシリンダ用の方向制御弁に作用する
ブーム上げパイロット信号圧を検出する手段を設け、該
ブーム上げパイロット信号圧が上昇傾向にあるときは、
コントローラにより前記電磁比例流量制御弁の開口面積
を最小にし、該ブーム上げパイロット信号圧が下降傾向
にあるときは、コントローラにより前記電磁比例流量制
御弁の開口面積を該ブーム上げパイロット信号圧に応じ
て拡開することを特徴とする油圧ショベルの制御回路。1. A boom speed switching valve, a directional control valve for a swing motor, and a directional control valve for an arm cylinder are connected in tandem toward the downstream side of the pump in a center bypass oil passage on the side of the first hydraulic pump, and the center is connected to the center bypass oil passage. The boom speed switching valve, the directional control valve for the swing motor, and the directional control valve for the arm cylinder are connected in parallel via a parallel oil passage branched in parallel from the bypass oil passage, and further connected to the second hydraulic pump side. For the boom cylinder, other control valves such as a directional control valve for the boom cylinder are appropriately arranged, and the pressure oil of the first hydraulic pump is branched from the boom speed switching valve according to the boom lifting pilot signal pressure. In a control circuit of a hydraulic excavator having an oil passage for merging with the directional control valve of the first hydraulic pump, which is downstream of the parallel oil passage of the first hydraulic pump and is for a swing motor. An electromagnetic proportional flow rate control valve is provided downstream of the directional control valve and upstream of the directional control valve for the arm cylinder, and means for detecting the boom raising pilot signal pressure acting on the directional control valve for the boom cylinder is provided. , When the boom raising pilot signal pressure tends to rise,
When the controller minimizes the opening area of the electromagnetic proportional flow control valve and the boom raising pilot signal pressure tends to decrease, the controller changes the opening area of the electromagnetic proportional flow control valve according to the boom raising pilot signal pressure. A control circuit for a hydraulic excavator characterized by expanding.
路にブーム速度切替弁と旋回モータ用の方向制御弁並び
にアームシリンダ用の方向制御弁をポンプ下流に向けて
タンデム接続するとともに、該センタバイパス油路から
平行に分岐されたパラレル油路を介して前記ブーム速度
切替弁と旋回モータ用の方向制御弁並びにアームシリン
ダ用の方向制御弁をパラレル接続し、更に、第２の油圧
ポンプ側にブームシリンダ用の方向制御弁をはじめとす
る他の制御弁を適宜配設し、ブーム上げパイロット信号
圧に応じて前記ブーム速度切替弁から第１の油圧ポンプ
の圧力油を分岐してブームシリンダ用の方向制御弁へ合
流させる油路を設けた油圧ショベルの制御回路に於い
て、前記第１の油圧ポンプのパラレル油路の下流であっ
て、旋回モータ用の方向制御弁の下流且つアームシリン
ダ用の方向制御弁の上流位置に電磁比例流量制御弁を介
装し、更に、旋回モータ用の方向制御弁に作用する旋回
パイロット信号圧を検出する手段を設け、該旋回パイロ
ット信号圧を検出したときは、コントローラにより前記
電磁比例流量制御弁の開口面積を最小にすることを特徴
とする油圧ショベルの制御回路。2. A boom speed switching valve, a directional control valve for a swing motor, and a directional control valve for an arm cylinder are connected in tandem toward the downstream side of the pump in the center bypass oil passage on the side of the first hydraulic pump, and the center is also connected to the center bypass oil passage. The boom speed switching valve, the directional control valve for the swing motor, and the directional control valve for the arm cylinder are connected in parallel via a parallel oil passage branched in parallel from the bypass oil passage, and further connected to the second hydraulic pump side. For the boom cylinder, other control valves such as a directional control valve for the boom cylinder are appropriately arranged, and the pressure oil of the first hydraulic pump is branched from the boom speed switching valve according to the boom lifting pilot signal pressure. In a control circuit of a hydraulic excavator having an oil passage for merging with the directional control valve of the first hydraulic pump, which is downstream of the parallel oil passage of the first hydraulic pump and is for a swing motor. An electromagnetic proportional flow rate control valve is provided at a position downstream of the directional control valve and upstream of the directional control valve for the arm cylinder, and means for detecting a swing pilot signal pressure acting on the directional control valve for the swing motor is provided. A control circuit for a hydraulic excavator, wherein a controller minimizes an opening area of the electromagnetic proportional flow control valve when the swing pilot signal pressure is detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8095536A JP3059378B2 (en) | 1996-04-17 | 1996-04-17 | Hydraulic excavator control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8095536A JP3059378B2 (en) | 1996-04-17 | 1996-04-17 | Hydraulic excavator control circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09279638A true JPH09279638A (en) | 1997-10-28 |
| JP3059378B2 JP3059378B2 (en) | 2000-07-04 |
Family
ID=14140293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8095536A Expired - Fee Related JP3059378B2 (en) | 1996-04-17 | 1996-04-17 | Hydraulic excavator control circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3059378B2 (en) |
Cited By (12)
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|---|---|---|---|---|
| JP2009002441A (en) * | 2007-06-21 | 2009-01-08 | Yanmar Co Ltd | Hydraulic circuit for excavating turning working vehicle |
| JP2011017135A (en) * | 2009-07-07 | 2011-01-27 | Sumitomo (Shi) Construction Machinery Co Ltd | Hydraulic circuit of construction machinery |
| JP2014167334A (en) * | 2013-02-28 | 2014-09-11 | Sumitomo (Shi) Construction Machinery Co Ltd | Hydraulic circuit of construction machine and its control method |
| JP2016125284A (en) * | 2015-01-06 | 2016-07-11 | 住友重機械工業株式会社 | Construction machine |
| CN107587544A (en) * | 2017-10-30 | 2018-01-16 | 三重机有限公司 | Control the system and method for control speed of ridge buster equipment speed |
| KR20180075624A (en) * | 2016-03-31 | 2018-07-04 | 히다찌 겐끼 가부시키가이샤 | Construction Machinery |
| CN108343646A (en) * | 2017-12-29 | 2018-07-31 | 长安大学 | A kind of electro-hydraulic hybrid-driven mechanical arm control system and control method |
| CN110359516A (en) * | 2019-07-24 | 2019-10-22 | 青岛雷沃工程机械有限公司 | Descending movable arm of excavator hydraulic control system and excavator |
| CN110777863A (en) * | 2019-11-01 | 2020-02-11 | 董志强 | Energy-saving excavator control system |
| CN113606203A (en) * | 2021-08-16 | 2021-11-05 | 潍柴动力股份有限公司 | Bucket rod hydraulic system and excavator |
| CN113819105A (en) * | 2021-11-25 | 2021-12-21 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system for electrically proportional controlling multi-working-position valve and control method thereof |
| WO2023134041A1 (en) * | 2022-01-17 | 2023-07-20 | 湖南星邦智能装备股份有限公司 | Control method for controlling retraction of boom, system, mechanical device and storage medium |
-
1996
- 1996-04-17 JP JP8095536A patent/JP3059378B2/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009002441A (en) * | 2007-06-21 | 2009-01-08 | Yanmar Co Ltd | Hydraulic circuit for excavating turning working vehicle |
| JP2011017135A (en) * | 2009-07-07 | 2011-01-27 | Sumitomo (Shi) Construction Machinery Co Ltd | Hydraulic circuit of construction machinery |
| JP2014167334A (en) * | 2013-02-28 | 2014-09-11 | Sumitomo (Shi) Construction Machinery Co Ltd | Hydraulic circuit of construction machine and its control method |
| JP2016125284A (en) * | 2015-01-06 | 2016-07-11 | 住友重機械工業株式会社 | Construction machine |
| KR20180075624A (en) * | 2016-03-31 | 2018-07-04 | 히다찌 겐끼 가부시키가이샤 | Construction Machinery |
| CN107587544B (en) * | 2017-10-30 | 2023-03-31 | 三一重机有限公司 | System for controlling speed of working device of scarifier and speed control method |
| CN107587544A (en) * | 2017-10-30 | 2018-01-16 | 三重机有限公司 | Control the system and method for control speed of ridge buster equipment speed |
| CN108343646A (en) * | 2017-12-29 | 2018-07-31 | 长安大学 | A kind of electro-hydraulic hybrid-driven mechanical arm control system and control method |
| CN110359516A (en) * | 2019-07-24 | 2019-10-22 | 青岛雷沃工程机械有限公司 | Descending movable arm of excavator hydraulic control system and excavator |
| CN110777863A (en) * | 2019-11-01 | 2020-02-11 | 董志强 | Energy-saving excavator control system |
| CN113606203A (en) * | 2021-08-16 | 2021-11-05 | 潍柴动力股份有限公司 | Bucket rod hydraulic system and excavator |
| CN113819105A (en) * | 2021-11-25 | 2021-12-21 | 江苏汇智高端工程机械创新中心有限公司 | Hydraulic system for electrically proportional controlling multi-working-position valve and control method thereof |
| WO2023134041A1 (en) * | 2022-01-17 | 2023-07-20 | 湖南星邦智能装备股份有限公司 | Control method for controlling retraction of boom, system, mechanical device and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3059378B2 (en) | 2000-07-04 |
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