JPH06307405A - Valve unit for regeneration circuit - Google Patents

Valve unit for regeneration circuit

Info

Publication number
JPH06307405A
JPH06307405A JP5093054A JP9305493A JPH06307405A JP H06307405 A JPH06307405 A JP H06307405A JP 5093054 A JP5093054 A JP 5093054A JP 9305493 A JP9305493 A JP 9305493A JP H06307405 A JPH06307405 A JP H06307405A
Authority
JP
Japan
Prior art keywords
valve
pressure
hydraulic cylinder
hydraulic
rod
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
Application number
JP5093054A
Other languages
Japanese (ja)
Other versions
JP2863410B2 (en
Inventor
欣也 ▲高▼橋
Kinya Takahashi
Yusaku Nozawa
勇作 野沢
Shiro Murakami
志朗 村上
Minoru Takahashi
稔 高橋
Yoshizumi Nishimura
良純 西村
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.)
Hitachi Construction Machinery Co Ltd
Original Assignee
Hitachi Construction Machinery Co Ltd
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 Hitachi Construction Machinery Co Ltd filed Critical Hitachi Construction Machinery Co Ltd
Priority to JP5093054A priority Critical patent/JP2863410B2/en
Publication of JPH06307405A publication Critical patent/JPH06307405A/en
Application granted granted Critical
Publication of JP2863410B2 publication Critical patent/JP2863410B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To offer a valve unit for a regeneration circuit capable of corresponding to any kind of an attachment without being removed or fitted. CONSTITUTION:A main valve 12 is provided between the rod side and the bottom side of a hydraulic cylinder 2 and a changeover valve 15 is provided between the rod side and the flow control valve 3. When speed is necessary to be increased, a stop valve 28 is closed. When the hydraulic cylinder 2 rod is extended, a check valve 26 is closed because differential pressure does not yield on a throttle 26s, and the main valve opens by the pressure from the rod side causing pressure oil on the rod side to reflux to the bottom side and increase speed. When load on the hydraulic cylinder 2 increases, a changeover valve 15 is switched, pressure oil on the rod side is discharged to a tank 5 and necessary thrust is obtained. When speed increase is not necessary, the stop valve 28 is opened. When the hydraulic cylinder 2 rod is extended, the main valve 12 does not open and speed increase is not be performed because the check valve 26 opens by the differential pressure of the throttle 26s and pressure oil on the rod side is discharged to the tank 5.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、油圧ショベル等の作業
機械に備えられている油圧シリンダを、当該油圧シリン
ダがタンクに排出する圧油を利用(再生)して増速させ
るための再生回路用弁装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerating circuit for increasing the speed of a hydraulic cylinder provided in a work machine such as a hydraulic excavator by utilizing (regenerating) pressure oil discharged from the hydraulic cylinder to a tank. Valve device

【0002】[0002]

【従来の技術】油圧シリンダにより駆動される機構には
数多くの種類がある。例えば、油圧ショベルにあって
は、ブーム、アーム、バケット、このバケットの代わり
に取り付けられる種々のアタッチメント等がある。これ
らの機構のなかには、その作業過程中、作業速度の増大
が要求される機構がある。例えば、上記アタッチメント
として用いられる破砕機は破砕対象となる物体を砕く機
構であるが、作業効率上、当該物体を挟むまでは高速で
駆動されるのが望ましい。
There are many types of mechanisms driven by hydraulic cylinders. For example, in a hydraulic excavator, there are a boom, an arm, a bucket, various attachments attached in place of the bucket, and the like. Among these mechanisms, there is a mechanism that requires an increase in working speed during the working process. For example, the crusher used as the attachment has a mechanism for crushing an object to be crushed, but it is desirable to drive at high speed until the object is sandwiched in terms of work efficiency.

【0003】さらに、増速の要望は次の例のような場合
にも存在する。即ち、アタッチメントを本体に取り付け
て駆動する場合、当該アタッチメントの設計上の最高圧
力が本体の最高圧力より低い場合、アタッチメントへの
圧油の供給量が小さくなり、作業速度が低下するおそれ
がある。このような場合もアタッチメントの増速が求め
られる。
Further, the demand for speeding up also exists in the following cases. That is, when the attachment is mounted on the main body and driven, if the designed maximum pressure of the attachment is lower than the maximum pressure of the main body, the amount of pressure oil supplied to the attachment may be small, and the work speed may be reduced. Even in such a case, it is required to speed up the attachment.

【0004】このように増速が要求される機構において
は、当然、これを駆動する油圧シリンダを増速させる手
段が備えられている。本出願人は、特願平4−2318
20号により、このような増速手段として他の油圧アク
チュエータの使用の有無に何等影響されることなく増速
を行うことができる弁装置を提案した。この弁装置を図
により説明する。
In such a mechanism requiring an increase in speed, as a matter of course, means for increasing the speed of the hydraulic cylinder for driving the mechanism is provided. The applicant of the present invention is Japanese Patent Application No. 4-2318.
No. 20 proposed a valve device capable of increasing the speed without being affected by the presence or absence of the use of another hydraulic actuator as the speed increasing means. This valve device will be described with reference to the drawings.

【0005】図2は本発明の実施例に係る再生回路用弁
装置の油圧回路図である。図で、1は油圧ポンプ、2は
油圧シリンダ、3は油圧シリンダ2の駆動方向および駆
動速度を制御する流量生御弁、はリリーフ弁、5はタン
クである。30、31は図示しない油圧アクチュエータ
の流量制御弁を示す。
FIG. 2 is a hydraulic circuit diagram of a valve device for a regeneration circuit according to an embodiment of the present invention. In the figure, 1 is a hydraulic pump, 2 is a hydraulic cylinder, 3 is a flow control valve for controlling the driving direction and driving speed of the hydraulic cylinder 2, is a relief valve, and 5 is a tank. Reference numerals 30 and 31 denote flow control valves of a hydraulic actuator (not shown).

【0006】10は再生回路用弁装置を示す。この再生
回路用弁装置10は、チェック弁11、主弁12、圧力
設定弁13、シャトル弁14、切換弁15、およびパイ
ロット管路16、17、18で構成されている。D1
2 、D3 は再生回路用弁装置10の弁ポートを示し、
再生回路用弁装置10はこれら弁ポートD1 、D2 、D
3 において通常の油圧アクチュエータの主管路(図示の
場合油圧シリンダ2のボトム側管路とロッド側管路)に
連結される。
Reference numeral 10 indicates a valve device for a regeneration circuit. The regeneration circuit valve device 10 includes a check valve 11, a main valve 12, a pressure setting valve 13, a shuttle valve 14, a switching valve 15, and pilot lines 16, 17, and 18. D 1 ,
D 2 and D 3 are valve ports of the regeneration circuit valve device 10,
The regeneration circuit valve device 10 has these valve ports D 1 , D 2 , and D.
At 3 , a main line of a normal hydraulic actuator (in the case shown, a bottom side line and a rod side line of the hydraulic cylinder 2) is connected.

【0007】主弁12は、油圧シリンダ2のロッド側圧
力を受ける弁12v、この弁12vを押圧するばね12
bおよびばね12b側の室12rで構成されている。圧
力設定弁13は、主弁12の室12rと連通する通孔を
遮断、開放する弁13v、この弁13vを遮断状態に押
圧するばね13bおよびボトム側管路と導通するベント
ポート13pで構成されている。
The main valve 12 is a valve 12v that receives pressure on the rod side of the hydraulic cylinder 2, and a spring 12 that presses the valve 12v.
b and the chamber 12r on the spring 12b side. The pressure setting valve 13 is composed of a valve 13v that closes and opens a through hole that communicates with the chamber 12r of the main valve 12, a spring 13b that presses the valve 13v to a closed state, and a vent port 13p that connects to the bottom side conduit. ing.

【0008】切換弁15はロッド側管路と接続されるポ
ート、流量制御弁と接続されるポート、およびボトム側
管路の圧力を導入するパイロットポートを有し、ボトム
側管路の圧力が所定値以下のとき図示の状態、即ち絞り
15sを介在させる状態とし、ボトム側管路の圧力が所
定値を超えるとき、絞り15sが介在しない導通状態に
切り換えられる。シャトル弁14はパイロット管路16
により導かれるボトム側圧力と、パイロット管路17に
より導かれる切換弁15の出口側圧力とを導入し、高い
方の圧力をパイロット管路18を介して主弁12の室1
2rへ導く。
The switching valve 15 has a port connected to the rod side pipe, a port connected to the flow control valve, and a pilot port for introducing the pressure in the bottom side pipe, and the pressure in the bottom side pipe is predetermined. When the pressure is equal to or less than the value, the state shown in the drawing, that is, the state in which the throttle 15s is interposed, is set. When the pressure in the bottom side pipeline exceeds a predetermined value, the conduction state is switched to the state in which the throttle 15s is not interposed. Shuttle valve 14 is pilot line 16
The pressure on the bottom side introduced by the pilot line 17 and the pressure on the outlet side of the switching valve 15 introduced by the pilot line 17 are introduced, and the higher pressure is introduced via the pilot line 18 into the chamber 1 of the main valve 12.
Lead to 2r.

【0009】次に、この弁装置10の動作を説明する。
流量制御弁3がB位置へ切り換えられると、油圧ポンプ
1の圧油はチェック弁11を介して油圧シリンダ2のロ
ッド側へ供給され、又、油圧シリンダ2のボトム側の圧
油は流量制御弁3を介してタンク5へ排出される。これ
により、油圧シリンダ2は通常の場合と同様、ロッドを
縮めるように駆動される。
Next, the operation of the valve device 10 will be described.
When the flow control valve 3 is switched to the B position, the pressure oil of the hydraulic pump 1 is supplied to the rod side of the hydraulic cylinder 2 via the check valve 11, and the pressure oil on the bottom side of the hydraulic cylinder 2 is supplied to the flow control valve. It is discharged to the tank 5 via 3. As a result, the hydraulic cylinder 2 is driven so as to contract the rod, as in the usual case.

【0010】流量制御弁3がA位置へ切り換えられる
と、油圧ポンプ1の圧油は油圧シリンダ2のボトム側へ
供給され、ロッドは伸長方向へ駆動される。このとき、
油圧シリンダ2の負荷が小さくボトム側圧力が低いと、
切換弁15は絞り15sが介在する図示位置に切り換え
られ、油圧シリンダ2のロッド側の圧油のうち僅かな量
が切換弁15の絞り15sの小径の孔を通り、流量制御
弁3を介してタンクに排出される。
When the flow control valve 3 is switched to the A position, the pressure oil of the hydraulic pump 1 is supplied to the bottom side of the hydraulic cylinder 2 and the rod is driven in the extending direction. At this time,
If the load on the hydraulic cylinder 2 is small and the bottom pressure is low,
The switching valve 15 is switched to the position shown in the drawing in which the throttle 15s is interposed, and a small amount of the pressure oil on the rod side of the hydraulic cylinder 2 passes through the small-diameter hole of the throttle 15s of the switching valve 15 and through the flow control valve 3. It is discharged to the tank.

【0011】一方、ロッド側の圧力は主弁12の弁12
vへ導かれてこれをばね12bに抗して開き、これによ
りロッド側管路とボトム側管路とが導通し、油圧シリン
ダ2のロッドからの圧油の大部分(絞り15sを流れる
圧油以外の圧油)はボトム側に還流され、ロッドの伸長
が増速されることになる。この還流は、従来のように流
量制御弁3の上流側でなく、直接ボトム側へなされるの
で、他のアクチュエータの駆動とは無関係となり、増速
させるべき油圧シリンダ2を確実に増速させることがで
きる。
On the other hand, the pressure on the rod side is the valve 12 of the main valve 12.
It is guided to v and opens it against the spring 12b, whereby the rod side conduit and the bottom side conduit are brought into conduction, and most of the pressure oil from the rod of the hydraulic cylinder 2 (pressure oil flowing through the throttle 15s). The pressure oil other than) is recirculated to the bottom side, and the extension of the rod is accelerated. Since this recirculation is performed directly to the bottom side rather than the upstream side of the flow control valve 3 as in the conventional case, it has nothing to do with the driving of other actuators, so that the hydraulic cylinder 2 to be accelerated can be surely accelerated. You can

【0012】この状態で、油圧シリンダ2の負荷が増大
し、ボトム側の圧力が大きくなって所定の圧力を超える
と、切換弁15が図示の位置から絞り15sが介在しな
い導通位置へ切り換えられる。一方、当該ボトム側の圧
力はパイロット管路16、シャトル弁14、パイロット
管路18を介して主弁12の室12rへ導かれ、弁12
vを閉じる。これにより、油圧シリンダ2のロッド側の
圧油は切換弁15、流量制御弁3を介してタンクに排出
され、このため、油圧シリンダ2は大きくなった負荷に
対してその推力を確保することができる。
In this state, when the load on the hydraulic cylinder 2 increases and the pressure on the bottom side increases and exceeds a predetermined pressure, the switching valve 15 is switched from the position shown in the figure to a conduction position in which no throttle 15s is interposed. On the other hand, the pressure on the bottom side is guided to the chamber 12r of the main valve 12 through the pilot pipe 16, the shuttle valve 14, and the pilot pipe 18, and the valve 12
Close v. As a result, the pressure oil on the rod side of the hydraulic cylinder 2 is discharged to the tank via the switching valve 15 and the flow rate control valve 3, so that the hydraulic cylinder 2 can secure its thrust force against the increased load. it can.

【0013】又、流量制御弁3が図示の中立位置にある
とき、仮に重力等により油圧シリンダ2のボトム側に圧
力がかかり、ロッドが伸ばされようとしても、切換弁1
5の出口は流量制御弁3でブロックされ、又、主弁12
においては、ロッド側の圧力が切換弁15の絞り15
s、パイロット管路17、シャトル弁14、およびパイ
ロット管路18を介して主弁12の室12rへ導入され
て弁12vを閉じるので、ロッド側の圧油の排出路はな
くなり、結局、当該中立位置でのロッドの動きは阻止さ
れ、停止位置が確実に保持される。
Further, when the flow rate control valve 3 is in the neutral position shown in the drawing, even if the rod is extended due to pressure on the bottom side of the hydraulic cylinder 2 due to gravity or the like, the switching valve 1
The outlet of 5 is blocked by the flow control valve 3, and the main valve 12
, The pressure on the rod side is the throttle 15 of the switching valve 15.
s, the pilot conduit 17, the shuttle valve 14, and the pilot conduit 18 are introduced into the chamber 12r of the main valve 12 to close the valve 12v, so that the pressure oil discharge path on the rod side disappears, and eventually the neutral position. Movement of the rod in position is blocked and the stop position is held securely.

【0014】さらに、何等かの理由によりロッド側に異
常な高圧が生じると、この高圧は上記の経路で主弁12
の室12rへ導入され、圧力設定弁13の弁13vをば
ね13bに抗して開く。これにより、ロッド側の圧油
が、切換弁15の絞り15s、パイロット管路17、シ
ャトル弁14、パイロット管路18、主弁12の室12
r、圧力設定弁13の通孔、および圧力設定弁13のベ
ントポート13pを介してボトム側管路へ流れ、この流
れにより絞り15sの前後に圧力差が生じ、この圧力差
で主弁12の弁12vが開き、ロッド側の圧油をボトム
側へ逃す。この結果、ロッド側管路や主弁12等の破損
を防止することができる。
Further, if an abnormally high pressure is generated on the rod side for some reason, this high pressure will flow through the main valve 12 through the above-mentioned path.
Is introduced into the chamber 12r, and the valve 13v of the pressure setting valve 13 is opened against the spring 13b. As a result, the pressure oil on the rod side is reduced by the throttle valve 15s of the switching valve 15, the pilot pipe line 17, the shuttle valve 14, the pilot pipe line 18, and the chamber 12 of the main valve 12.
r, the through hole of the pressure setting valve 13, and the vent port 13p of the pressure setting valve 13 to flow to the bottom side pipe line, and this flow causes a pressure difference before and after the throttle 15s. The valve 12v opens and the pressure oil on the rod side escapes to the bottom side. As a result, it is possible to prevent damage to the rod side conduit, the main valve 12, and the like.

【0015】[0015]

【発明が解決しようとする課題】ところで、上記再生回
路用弁装置10は、通常、図2にも示すように流量制御
弁と油圧アクチュエータとの間の配管の中途に、弁ポー
トD1 〜D3 を用いて配置されている。この配置を油圧
ショベルの配置例で説明する。図3は油圧ショベルの側
面図である。この図で、20は下部走行体、21は上部
旋回体、22はブーム、23はアームである。アーム2
3の先端23aにバケット、破砕機等のアタッチメント
が回動自在に取り付けられる。22aは再生回路用弁装
置10の取り付け個所を示す。
By the way, in the regeneration circuit valve device 10, the valve ports D 1 to D are normally provided in the middle of the pipe between the flow control valve and the hydraulic actuator as shown in FIG. It is arranged using three . This arrangement will be described with reference to an arrangement example of hydraulic excavators. FIG. 3 is a side view of the hydraulic excavator. In this figure, 20 is a lower traveling body, 21 is an upper swing body, 22 is a boom, and 23 is an arm. Arm 2
An attachment such as a bucket or a crusher is rotatably attached to the tip 23a of the No. 3 unit. Reference numeral 22a indicates a mounting portion of the regeneration circuit valve device 10.

【0016】図4は図3に示す取り付け個所22aの平
面図(図3で取り付け個所22aを上からみた図)であ
る。この図で、2は図2に示す油圧シリンダ、10は同
じく再生回路用弁装置である。22bはブーム22の両
側のフレームを示し、油圧アクチュエータへの各種配管
がこの個所を通って配設されている。図では油圧シリン
ダ2への配管Lのみが示されている。D1 〜D3 は図2
に示す弁ポートD1 〜D3 に相当する管継手である。
FIG. 4 is a plan view of the mounting portion 22a shown in FIG. 3 (a view of the mounting portion 22a seen from above in FIG. 3). In this figure, 2 is the hydraulic cylinder shown in FIG. 2, and 10 is the valve device for the regeneration circuit. Reference numeral 22b denotes frames on both sides of the boom 22, and various pipes to the hydraulic actuator are arranged through this portion. In the figure, only the pipe L to the hydraulic cylinder 2 is shown. D 1 to D 3 are shown in FIG.
The pipe joints corresponding to the valve ports D 1 to D 3 shown in FIG.

【0017】このように取り付けられた弁装置10の動
作は上述のとおりであるが、アタッチメントとして再生
回路を必要としないアタッチメントが取付けられた場
合、このままの状態では不必要な増速が生じて当該アタ
ッチメントを正常に作動させることはできない。この場
合、再生回路用弁装置10は、各管継手D1 〜D3 を用
いて回路から取り外すことになるが、このような取外
し、さらに再生回路を必要とするアタッチメントが使用
される場合の再取り付けには多大の手間と時間を要し、
かつ、油漏れを生じるという問題があった。
The operation of the valve device 10 thus mounted is as described above. However, when an attachment that does not require a regeneration circuit is mounted as an attachment, an unnecessarily increased speed is generated in this state, and the speed is increased. The attachment cannot operate normally. In this case, the reproduction circuit valve device 10 is re when it will be removed from the circuit using the pipe joint D 1 to D 3, such removal, the attachment further requiring recovery circuit is used It takes a lot of time and effort to install,
Moreover, there is a problem that oil leakage occurs.

【0018】本発明の目的は、上記技術における課題を
解決し、どのようなアタッチメントに対しても着脱の必
要のない再生回路用弁装置を提供することにある。
An object of the present invention is to solve the above problems in the art and to provide a valve device for a regenerative circuit which does not need to be attached to or detached from any attachment.

【0019】[0019]

【課題を解決するための手段】上記の目的を達成するた
め、本発明は、油圧ポンプと、この油圧ポンプにより駆
動される油圧アクチュエータと、前記油圧ポンプと前記
油圧アクチュエータとの間に介在し当該油圧アクチュエ
ータの駆動を制御する流量制御弁と、前記油圧アクチュ
エータの一方側管路と他方側管路との間の導通、遮断を
行う主弁と、前記一方側管路と前記流量制御弁との間に
介在し前記他方側管路の圧力が所定値以下であるとき前
記一方側管路と前記流量制御弁との間の油圧回路の状態
を導通状態から絞り状態へ切り換える切換弁と、前記他
方側管路の圧力と前記切換弁の出口圧力のうち高い方の
圧力を前記主弁の室へ導入するパイロット管路とで構成
されている再生回路用弁装置において、前記切換弁と並
列に、第1のチェック弁、第2のチェック弁および止弁
より成る直列回路を接続し、前記止弁の開閉により前記
第1のチェック弁で前記一方側管路の圧油を開閉するこ
とを特徴とする。
In order to achieve the above object, the present invention provides a hydraulic pump, a hydraulic actuator driven by the hydraulic pump, and an intervening device between the hydraulic pump and the hydraulic actuator. A flow control valve for controlling the drive of the hydraulic actuator, a main valve for connecting and disconnecting the one side pipeline and the other side pipeline of the hydraulic actuator, and the one side pipeline and the flow control valve. A switching valve interposed between the switching valve for switching the state of the hydraulic circuit between the one-side pipeline and the flow control valve from a conduction state to a throttle state when the pressure in the other-side pipeline is below a predetermined value; In a valve device for a regeneration circuit configured by a pilot line that introduces a higher pressure of a pressure in a side pipe and an outlet pressure of the switching valve into a chamber of the main valve, in parallel with the switching valve, First Choi Click valve, the second check valve and connecting the series circuit consisting of check valve, and wherein the opening and closing the hydraulic fluid of the one side conduit with the first check valve by opening and closing of the valve.

【0020】[0020]

【作用】増速を必要とするアタッチメントが取り付けら
れた場合、止弁は遮断状態とされる。この状態で、流量
制御弁が切り換えられ、油圧アクチュエータ、例えば油
圧シリンダがロッドを伸長させる方向に駆動されている
とき、第1のチェック弁は遮断状態となり、当該油圧シ
リンダの負荷が軽くボトム側圧力が上昇しない状態では
ロッド側管路と流量制御弁との間の油圧回路の状態は絞
り状態に切り換えられる。この状態で、ロッド側からの
圧油のうち僅かな量が絞りを通ってタンクに排出される
とともに、当該圧油のほとんどは主弁を開いて直接ボト
ム側管路へ還流され、油圧シリンダの増速が行われる。
一方、油圧シリンダの負荷が大きい場合、主弁は遮断状
態になるとともに、切換弁が導通状態に切り換えられ
る。これにより、当該大きな負荷に対して油圧シリンダ
の推力は充分に確保される。又、流量制御弁がロッドを
縮める方向に切り換えられた場合、流量制御弁からの圧
油は第1のチェック弁を押し開いてロッド側に供給され
る。
When the attachment requiring the speed increase is attached, the stop valve is closed. In this state, when the flow rate control valve is switched and the hydraulic actuator, for example, the hydraulic cylinder is driven in the direction to extend the rod, the first check valve is in the closed state, and the load on the hydraulic cylinder is light and the pressure on the bottom side is low. In a state in which the pressure does not rise, the state of the hydraulic circuit between the rod side conduit and the flow control valve is switched to the throttled state. In this state, a small amount of the pressure oil from the rod side is discharged to the tank through the throttle, and most of the pressure oil is returned to the bottom side pipe line by opening the main valve, and the hydraulic cylinder Acceleration is performed.
On the other hand, when the load on the hydraulic cylinder is large, the main valve is shut off and the switching valve is switched to the conductive state. Thereby, the thrust of the hydraulic cylinder is sufficiently secured against the large load. Further, when the flow control valve is switched in the direction of contracting the rod, the pressure oil from the flow control valve pushes the first check valve and is supplied to the rod side.

【0021】増速を必要としないアタッチメントが取り
付けられた場合、止弁は導通状態とされる。この状態
で、流量制御弁が切り換えられ、油圧シリンダがロッド
を伸長させる方向に駆動されているとき、ロッドからの
圧油は第1のチェック弁を開いて流量制御弁を介しタン
クに排出されるので、主弁は開かず、増速は行われな
い。流量制御弁がロッドを縮める方向に切り換えられた
場合は、流量制御弁からの圧油は第1のチェック弁を押
し開いてロッド側に供給される。
When an attachment that does not require speed-up is attached, the stop valve is made conductive. In this state, when the flow control valve is switched and the hydraulic cylinder is driven in the direction to extend the rod, the pressure oil from the rod opens the first check valve and is discharged to the tank via the flow control valve. Therefore, the main valve does not open and the speed is not increased. When the flow control valve is switched to the direction of contracting the rod, the pressure oil from the flow control valve pushes the first check valve to open and is supplied to the rod side.

【0022】[0022]

【実施例】以下本発明を図示の実施例に基づいて説明す
る。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the illustrated embodiments.

【0023】図1は本発明の実施例に係る再生回路用弁
装置の油圧回路図である。この図で、図2に示す部分と
同一又は等価な部分には同一符号を付して説明を省略す
る。25は本実施例の再生回路用弁装置を示す。17s
はパイロット回路17に介在する絞りである。26はチ
ェック弁であり、このチェック弁26は、弁26v、こ
の弁26vを閉じる方向に付勢するばね26b、このば
ね26bのばね室26r、および弁26vにおけるばね
室26rと外部管路L2 との間の通路に形成された絞り
26sで構成されている。又、チェック弁26は切換弁
15の出口とポートD1 との間の管路と管路L1 で接続
されている。27は切換弁15の出口とポートD1 との
間の管路とチェック弁26のばね室26rとを接続する
パイロット回路である。28は止弁、29はチェック弁
であり、これらはパイロット回路27に介在している。
FIG. 1 is a hydraulic circuit diagram of a valve device for a regeneration circuit according to an embodiment of the present invention. In this figure, parts that are the same as or equivalent to those shown in FIG. Reference numeral 25 shows a valve device for a regeneration circuit of this embodiment. 17s
Is a diaphragm interposed in the pilot circuit 17. Reference numeral 26 is a check valve. The check valve 26 includes a valve 26v, a spring 26b for urging the valve 26v in a closing direction, a spring chamber 26r of the spring 26b, a spring chamber 26r of the valve 26v and an external conduit L 2. It is composed of a diaphragm 26s formed in the passage between the and. Further, the check valve 26 is connected by a pipe line L 1 and a pipe line between the outlet of the switching valve 15 and the port D 1 . Reference numeral 27 is a pilot circuit that connects the conduit between the outlet of the switching valve 15 and the port D 1 and the spring chamber 26r of the check valve 26. 28 is a stop valve and 29 is a check valve, which are interposed in the pilot circuit 27.

【0024】次に、本実施例の動作を説明する。再生回
路を必要とするアタッチメントが取り付けられた場合、
止弁28は手動又は電動で遮断状態とされる。この状態
で、流量制御弁3がA位置に切り換えられると、油圧ポ
ンプ1の圧油は油圧シリンダ2のボトム側に供給され
る。この場合、止弁28が遮断されているので、油圧シ
リンダ2のロッド側の油はチェック弁26の絞り26s
を流れずここに差圧が発生しないので、チェック弁26
は遮断状態にある。したがって、再生回路用弁装置25
の動作は図2に示す再生回路用弁装置10の動作と同一
動作となり、増速および推力発生が行われる。
Next, the operation of this embodiment will be described. If an attachment that requires a regeneration circuit is attached,
The stop valve 28 is manually or electrically shut off. In this state, when the flow control valve 3 is switched to the A position, the pressure oil of the hydraulic pump 1 is supplied to the bottom side of the hydraulic cylinder 2. In this case, since the stop valve 28 is shut off, the oil on the rod side of the hydraulic cylinder 2 will not flow through the throttle 26s of the check valve 26.
Flow through the check valve 26 because no differential pressure is generated here.
Is shut off. Therefore, the valve device 25 for the regeneration circuit
2 is the same as the operation of the valve device 10 for the regeneration circuit shown in FIG. 2, and speedup and thrust generation are performed.

【0025】又、流量制御弁3がB位置に切り換えられ
た場合、油圧ポンプ1の圧油は管路L1 を介してチェッ
ク弁26に供給されこれを押し開くので、このチェック
弁26が図2に示すチェック弁11と同じ機能を遂行す
ることとなり、図2の再生回路10と同様に油圧シリン
ダ2のロッドを縮める。
Further, when the flow control valve 3 is switched to the B position, the pressure oil of the hydraulic pump 1 is supplied to the check valve 26 via the line L 1 and pushes it open, so that the check valve 26 is opened. The same function as the check valve 11 shown in FIG. 2 is performed, and the rod of the hydraulic cylinder 2 is contracted similarly to the regeneration circuit 10 of FIG.

【0026】一方、再生回路を必要としないアタッチメ
ントが取り付けられた場合、止弁28は手動又は電動で
導通状態とされる。この状態で、流量制御弁3がA位置
に切り換えられると、油圧ポンプ1の圧油は油圧シリン
ダ2のボトム側に供給される。この場合、止弁28が導
通状態とされているので、油圧シリンダ2のロッド側の
油はチェック弁26の絞り26sを流れ、これにより絞
り26sに差圧が生じ、この差圧によりチェック弁26
の弁26vがばね26bの圧力に抗して開き、ロッド側
の油は管路L2 、チェック弁26、管路L1 を通ってタ
ンクに排出される。このため、切換弁15の絞り15s
には油は流れず差圧が発生しないので、主弁12は遮断
状態となり、したがって、増速は行われない。流量制御
弁3がB位置に切り換えられた場合、チェック弁29
が、止弁28を遮断状態にしたと同様の働きをするの
で、上記の場合と同様の作用によりロッドが縮められ
る。
On the other hand, when an attachment that does not require a regeneration circuit is attached, the stop valve 28 is brought into a conductive state manually or electrically. In this state, when the flow control valve 3 is switched to the A position, the pressure oil of the hydraulic pump 1 is supplied to the bottom side of the hydraulic cylinder 2. In this case, since the stop valve 28 is in the conductive state, the oil on the rod side of the hydraulic cylinder 2 flows through the throttle 26s of the check valve 26, which causes a differential pressure in the throttle 26s, and this differential pressure causes the check valve 26 to move.
Valve 26v opens against the pressure of the spring 26b, and the oil on the rod side is discharged to the tank through the line L 2 , the check valve 26, and the line L 1 . Therefore, the throttle 15s of the switching valve 15
Since no oil flows into the valve and no differential pressure is generated, the main valve 12 is shut off, and therefore the speed is not increased. When the flow control valve 3 is switched to the B position, the check valve 29
However, since it works the same as when the stop valve 28 is closed, the rod is contracted by the same operation as in the above case.

【0027】このように、本実施例では、切換弁15と
並列に、チェック弁26、29、止弁28の直列回路を
接続し、増速を必要とするアタッチメントが取り付けら
れた場合には止弁28を遮断し、増速を必要としないア
タッチメントが取り付けられた場合には止弁28を導通
させるようにしたので、どのようなアタッチメントに対
しても、再生回路の取り付けや取外しを不要とすること
ができる。
As described above, in this embodiment, the series circuit of the check valves 26 and 29 and the stop valve 28 is connected in parallel with the switching valve 15 and the stop valve is stopped when the attachment requiring the speed-up is attached. Since the valve 28 is shut off and the stop valve 28 is made conductive when an attachment that does not require speed-up is attached, it is not necessary to attach or detach the regeneration circuit to any attachment. be able to.

【0028】又、パイロット回路17に設けた絞り17
sは切換弁15の絞り15sより小さな絞りに選定され
ており、次のような機能を有する。即ち、図2に示す構
成では、絞り15sはリリーフ用と負荷保持用を兼用し
た絞りであり、増速中に流量制御弁3を急停止した場
合、シリンダにオーバーランが発生してしまうため絞り
15sを大きくする必要がある。しかし、本実施例のよ
うに絞り17sを設けることにより、この絞り17sに
リリーフの機能をもたせ、絞り15sの機能を負荷保持
のみとすることができるので、絞り15sを大きくしな
くても済む。
A diaphragm 17 provided in the pilot circuit 17
s is selected as a throttle smaller than the throttle 15s of the switching valve 15, and has the following function. That is, in the configuration shown in FIG. 2, the throttle 15s is a throttle for both relief and load holding, and if the flow control valve 3 is suddenly stopped during acceleration, an overrun will occur in the cylinder, so It is necessary to increase 15s. However, by providing the diaphragm 17s as in the present embodiment, the diaphragm 17s can be provided with a relief function and the function of the diaphragm 15s can be limited only to load holding, so that it is not necessary to enlarge the diaphragm 15s.

【0029】なお、上記再生回路における圧力設定弁1
3は必ずしも必要ではない。又、切換弁15を、絞り1
5sを介在させる切り換え位置と導通位置とで構成する
例について説明したが、これに限ることはなく、絞り1
5sを介在させる切り換え位置を遮断位置とし、切換弁
15に並列に絞り15sと等価の絞りを接続してもよ
い。
The pressure setting valve 1 in the regeneration circuit is
3 is not always necessary. Further, the switching valve 15 is set to the throttle 1
Although the example in which the switching position and the conduction position in which 5 s is interposed is configured has been described, the invention is not limited to this, and the diaphragm 1
The switching position where 5 s is interposed may be set to the shut-off position, and the switching valve 15 may be connected in parallel with a throttle equivalent to the throttle 15 s.

【0030】[0030]

【発明の効果】以上述べたように、本発明では、切換弁
と並列に、第1のチェック弁、第2のチェック弁および
止弁より成る直列回路を接続し、止弁の開閉により第1
のチェック弁を開閉して増速要、不要の選択を行うよう
にしたので、どのようなアタッチメントに対しても、再
生回路の取り付けや取外しを不要とすることができる。
As described above, according to the present invention, the series circuit including the first check valve, the second check valve and the stop valve is connected in parallel with the switching valve, and the first valve is opened and closed by the first circuit.
Since the check valve of (1) is opened / closed to select whether acceleration is required or not, it is not necessary to attach or detach the reproduction circuit to any attachment.

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

【図1】本発明の実施例に係る再生回路用弁装置の油圧
回路図である。
FIG. 1 is a hydraulic circuit diagram of a valve device for a regeneration circuit according to an embodiment of the present invention.

【図2】提案されている再生回路用弁装置の油圧回路図
である。
FIG. 2 is a hydraulic circuit diagram of a proposed valve device for a regeneration circuit.

【図3】油圧ショベルの側面図である。FIG. 3 is a side view of the hydraulic excavator.

【図4】再生回路用弁装置の設置個所の平面図である。FIG. 4 is a plan view of an installation location of a valve device for a regeneration circuit.

【符号の説明】[Explanation of symbols]

1 油圧ポンプ 2 油圧シリンダ 3 流量制御弁 10 再生回路用弁装置 11 チェック弁 12 主弁 13 圧力設定弁 14 シャトル弁 15 切換弁 15s、26s 絞り 16、17、18 パイロット管路 26、29 チェック弁 26v 弁 28 止弁 1 Hydraulic Pump 2 Hydraulic Cylinder 3 Flow Control Valve 10 Regeneration Circuit Valve Device 11 Check Valve 12 Main Valve 13 Pressure Setting Valve 14 Shuttle Valve 15 Switching Valve 15s, 26s Throttle 16, 17, 18 Pilot Line 26, 29 Check Valve 26v Valve 28 stop valve

フロントページの続き (72)発明者 高橋 稔 茨城県土浦市神立町650番地 日立建機株 式会社土浦工場内 (72)発明者 西村 良純 茨城県土浦市神立町650番地 日立建機株 式会社土浦工場内Front page continuation (72) Minoru Takahashi Minoru Takahashi 650 Jinrachicho, Tsuchiura City, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant in the factory

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 油圧ポンプと、この油圧ポンプにより駆
動される油圧アクチュエータと、前記油圧ポンプと前記
油圧アクチュエータとの間に介在し当該油圧アクチュエ
ータの駆動を制御する流量制御弁と、前記油圧アクチュ
エータの一方側管路と他方側管路との間の導通、遮断を
行う主弁と、前記一方側管路と前記流量制御弁との間に
介在し前記他方側管路の圧力が所定値以下であるとき前
記一方側管路と前記流量制御弁との間の油圧回路の状態
を導通状態から絞り状態へ切り換える切換弁と、前記他
方側管路の圧力と前記切換弁の出口圧力のうち高い方の
圧力を前記主弁の室へ導入するパイロット管路とで構成
されている再生回路用弁装置において、前記切換弁と並
列に、第1のチェック弁、第2のチェック弁および止弁
より成る直列回路を接続し、前記止弁の開閉により前記
第1のチェック弁で前記一方側管路の圧油を開閉するこ
とを特徴とする再生回路用弁装置。
1. A hydraulic pump, a hydraulic actuator driven by the hydraulic pump, a flow rate control valve interposed between the hydraulic pump and the hydraulic actuator to control the drive of the hydraulic actuator, and a hydraulic actuator of the hydraulic actuator. If the main valve that conducts or shuts off the connection between the one-side pipe and the other-side pipe and the pressure in the other-side pipe that is interposed between the one-side pipe and the flow control valve is below a predetermined value. A switching valve that switches the state of the hydraulic circuit between the one-side pipeline and the flow rate control valve from a conduction state to a throttle state at a certain time, and the higher of the pressure in the other-side pipeline and the outlet pressure of the switching valve. In a regeneration circuit valve device configured to introduce a pressure of 1 to a chamber of the main valve, the regeneration circuit valve device including a first check valve, a second check valve, and a stop valve in parallel with the switching valve. Series circuit A valve device for a regeneration circuit, which is connected and opens and closes the stop valve to open and close the pressure oil in the one-side pipe by the first check valve.
JP5093054A 1993-04-20 1993-04-20 Valve device for regeneration circuit Expired - Fee Related JP2863410B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5093054A JP2863410B2 (en) 1993-04-20 1993-04-20 Valve device for regeneration circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5093054A JP2863410B2 (en) 1993-04-20 1993-04-20 Valve device for regeneration circuit

Publications (2)

Publication Number Publication Date
JPH06307405A true JPH06307405A (en) 1994-11-01
JP2863410B2 JP2863410B2 (en) 1999-03-03

Family

ID=14071801

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5093054A Expired - Fee Related JP2863410B2 (en) 1993-04-20 1993-04-20 Valve device for regeneration circuit

Country Status (1)

Country Link
JP (1) JP2863410B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102588362A (en) * 2011-01-17 2012-07-18 林德材料控股有限责任公司 Control valve device of double-acting arm cylinder for operating mobile working machine
CN115233766A (en) * 2022-07-08 2022-10-25 湖南工业职业技术学院 Hydraulic control system and hydraulic negative flow control method for excavator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102588362A (en) * 2011-01-17 2012-07-18 林德材料控股有限责任公司 Control valve device of double-acting arm cylinder for operating mobile working machine
CN102588362B (en) * 2011-01-17 2016-04-20 林德液压两合公司 For operating the control valve device of the double-acting dipper cylinder of mobile operation machinery
CN115233766A (en) * 2022-07-08 2022-10-25 湖南工业职业技术学院 Hydraulic control system and hydraulic negative flow control method for excavator
CN115233766B (en) * 2022-07-08 2023-11-28 湖南工业职业技术学院 Hydraulic control system and hydraulic negative flow control method for excavator

Also Published As

Publication number Publication date
JP2863410B2 (en) 1999-03-03

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