JPS61261535A - Liquid-pressure slewing circuit for construction machine - Google Patents

Liquid-pressure slewing circuit for construction machine

Info

Publication number
JPS61261535A
JPS61261535A JP10157885A JP10157885A JPS61261535A JP S61261535 A JPS61261535 A JP S61261535A JP 10157885 A JP10157885 A JP 10157885A JP 10157885 A JP10157885 A JP 10157885A JP S61261535 A JPS61261535 A JP S61261535A
Authority
JP
Japan
Prior art keywords
pump
valve
accumulator
circuit
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10157885A
Other languages
Japanese (ja)
Inventor
Kazuo Uehara
上原 一男
Yoshie Koibuchi
鯉渕 芳栄
Hiroshi Endo
弘 遠藤
Tadao Kikuchi
菊池 忠男
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.)
Komatsu Ltd
Original Assignee
Komatsu 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 Komatsu Ltd filed Critical Komatsu Ltd
Priority to JP10157885A priority Critical patent/JPS61261535A/en
Publication of JPS61261535A publication Critical patent/JPS61261535A/en
Pending legal-status Critical Current

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02FDREDGING; SOIL-SHIFTING
    • E02F9/00Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20Drives; Control devices
    • E02F9/22Hydraulic or pneumatic drives
    • E02F9/2217Hydraulic or pneumatic drives with energy recovery arrangements, e.g. using accumulators, flywheels
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H61/00Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/38Control of exclusively fluid gearing
    • F16H61/40Control of exclusively fluid gearing hydrostatic
    • F16H61/42Control of exclusively fluid gearing hydrostatic involving adjustment of a pump or motor with adjustable output or capacity
    • F16H61/423Motor capacity control by fluid pressure control means

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)
  • Jib Cranes (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

PURPOSE:To control a motor for slewing a construction machine when engine is stopped during the slewing period by a method in which when discharge amounts of a pilot pump are lowered to less than a given pressure, an accumulator is led to the discharge circuit of the pilot pump. CONSTITUTION:A main pump 2 and an accumulator 15 are connected through a main circuit 5 to a slewing motor 4 to be controlled by a servo valve 7, and a pilot pump 3 is connected through an operating valve 9 to the controller of the valve 7. In such a liquid-pressure slewing circuit, the accumulator 15 is connected to the discharge circuit of the pump 3 through a reducing valve 17 and a check valve 18. When an engine 1 is stopped during slewing operation, the discharge pressure of the pump 3 is lowered, and pressure stored in the accumulator 15 is sent through the valves 17 and 18 into the discharge circuit. The slewing motor 4 can thus be controlled by valve 9 in spite of the stoppage of the engine 1.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、アキュムレータを用いたパワーショベル、ク
レーン等上部旋回体を有する建設機械の旋回液圧回路に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a swing hydraulic circuit for a construction machine having an upper revolving body, such as a power shovel or a crane, using an accumulator.

従来の技術 従来の7キユムレータを用い几上記液圧回路は第2図に
示すようになっていて、メインポンプαによって旋回モ
ータbを駆動させて上部旋回体を旋回させ、上部旋回体
を停止させるときには旋回モータbをポンプとして使い
、旋回体の慣性エネルギをアキュムレータCにて液圧と
して蓄えるようになっている。そしてアキュムレータC
に蓄え友エネルギをメインポンプαと旋回モータbを接
続するメイン回路dに供給して旋回モータbt−,駆動
するLうになっている。
2. Description of the Related Art A conventional 7-cumulator is used.The above hydraulic circuit is as shown in Fig. 2, and the main pump α drives the swing motor b to swing the upper revolving structure and stop the upper revolving structure. Sometimes, the swing motor b is used as a pump, and the inertial energy of the swing body is stored as hydraulic pressure in the accumulator C. and accumulator C
The stored energy is supplied to a main circuit d connecting the main pump α and the swing motor b, thereby driving the swing motor bt-.

eは旋回モータbのサーボ弁fを制御する比例制御弁型
の操作弁、!iはパイロットポンプである。
e is a proportional control valve type operation valve that controls the servo valve f of the swing motor b,! i is a pilot pump.

発明が解決しようとする問題点 上記従来の技術では、(目旋回中にエンジンが停止する
と、アキュムレータCに蓄えたエネルギをすべて放出す
るまで旋回が停止しない。(2]傾斜地において作業中
エンジンが停止すると旋回体の自重によって旋回を始め
てしまう、という問題があった。
Problems to be Solved by the Invention In the above conventional technology, (If the engine stops while turning, the turning will not stop until all the energy stored in the accumulator C is released. (2) The engine stops while working on a slope. Then, there was a problem in that the rotating body would start turning due to its own weight.

問題点を解決する友めの手段及び作用 本発明は上記のことにかんがみなされ友もので、パイロ
ットポンプの吐出圧が所定圧力以下になり次ときに連通
するようにしてパイロットポンプの吐出回路に接続し之
構成となっており、エンジンが停止してメインポンプ及
びパイロットポンプの吐出圧がなくなつ之ときにおいて
も旋回モータはアキュムレータからの圧力にて駆動され
、またこの旋回モータの制御もアキュムレータからの圧
力にて行なわれる。
Complementary Means and Effects for Solving the Problems The present invention has been made in consideration of the above-mentioned problems, and is a method for connecting a pilot pump to a discharge circuit in such a way that the pilot pump is connected to the discharge circuit when the discharge pressure of the pilot pump becomes lower than a predetermined pressure. This configuration allows the swing motor to be driven by the pressure from the accumulator even when the engine stops and the discharge pressure of the main pump and pilot pump disappears, and the control of this swing motor is also controlled by the pressure from the accumulator. It is done under pressure.

案  施  例 本発明の実施例を第1図に基づいて説明する。Example of proposal An embodiment of the present invention will be described based on FIG.

図中IFiエンジン、2.3はエンジン1にて駆動され
るメインポンプとパイロットポンプ、4はメインポンプ
2とメイン回路5にて接続し九両振り斜板型の旋回モー
タ、6はこの旋回モータ4にて駆動される旋回体である
。7は旋回モータ4を制御するサーボバルブであシ、こ
のサーボバルブ7の入力ポートは上記パイロットポンプ
3に接続されている。またサーボバルブ7の左右のパイ
ロット圧作用部はそれぞれパイロット回路εα、8bを
介して比例制御弁型の操作弁9を介して上記パイロット
ポンプ3に接続されている。上記パイロット回路6α、
8bにはそれぞれシャトル弁10z、jobが介装して
あってそれぞれに他のパイロット回路11・α。
In the figure, the IFi engine, 2.3 are the main pump and pilot pump driven by the engine 1, 4 is a nine-sided swash plate type swing motor connected to the main pump 2 through the main circuit 5, and 6 is this swing motor. It is a revolving body driven by 4. A servo valve 7 controls the swing motor 4, and an input port of the servo valve 7 is connected to the pilot pump 3. Further, the left and right pilot pressure acting portions of the servo valve 7 are connected to the pilot pump 3 via pilot circuits εα and 8b, respectively, and a proportional control valve type operating valve 9. The above pilot circuit 6α,
Shuttle valves 10z and 8b are respectively interposed with shuttle valves 10z and job, and each is connected to other pilot circuits 11 and α.

1(bが分岐されている。1(b is branched.

上記旋回モータ4にはインペラポンプ12とメータリン
グポンプ13が同軸状に連結されている。メータリング
ポンプ13は回転方向によプ左右の吐出ポート14α、
14bから圧油が吐出されるようになっている。そして
この両吐出ポート14α、14bのうち左側の吐出ポー
ト14αは上記他のパイロット回路11α、11bのう
ち、右側の回路11bに、右側の吐出ポート14bは左
側のパイロット回路11αにそれぞれ接続されている。
An impeller pump 12 and a metering pump 13 are coaxially connected to the swing motor 4. The metering pump 13 has left and right discharge ports 14α,
Pressure oil is discharged from 14b. Of the two discharge ports 14α, 14b, the left discharge port 14α is connected to the right circuit 11b among the other pilot circuits 11α, 11b, and the right discharge port 14b is connected to the left pilot circuit 11α. .

15はメイン回路5にシーケンス弁16t−介して接続
したアキュムレータである。そしてこのアキュムレータ
15には減圧弁17及びチェック弁18t−介してパイ
ロットポンプ3の吐出回路に接続されている。19は漏
れ防止弁であシ、この漏れ防止弁19は上記操作弁9に
て開となるようにしである。
15 is an accumulator connected to the main circuit 5 via a sequence valve 16t. The accumulator 15 is connected to the discharge circuit of the pilot pump 3 via a pressure reducing valve 17 and a check valve 18t. 19 is a leak prevention valve, and this leak prevention valve 19 is opened by the operation valve 9.

上記構成において、エンジン1の駆動時において、操作
弁9を右旋回側へ操作する。とパイロットポンプ3から
のパイロット圧が右操作側のパイロット回路8bt通っ
てサーボバルブ7の右操作側に作用してこれが右側に切
換えられる。
In the above configuration, when the engine 1 is driven, the operation valve 9 is operated to the right turning side. The pilot pressure from the pilot pump 3 passes through the pilot circuit 8bt on the right operation side, acts on the right operation side of the servo valve 7, and is switched to the right side.

一方上記操作弁9の操作によシ漏れ防止弁19が開とな
ってメインポンプ2及びアキュムレータ15の圧油が旋
回モータ4に送り込まれ、旋回モータ4は右方向に回転
し始める。このときの旋回モータ4の回転速度は上記操
作弁9の操作角に比例される。このとき、旋回モータ4
の駆動にニジメータリングポンプ13も駆動され、右側
の吐出ポー)14bから圧油を吐出し、この吐出油がシ
ャトル弁1oath介して左側のパイロット回路gαに
入り、サーボバルブ7を中立に戻す方向に付勢する。
On the other hand, by operating the operation valve 9, the leakage prevention valve 19 is opened, and the pressure oil from the main pump 2 and the accumulator 15 is sent to the swing motor 4, and the swing motor 4 begins to rotate in the right direction. The rotational speed of the swing motor 4 at this time is proportional to the operating angle of the operating valve 9. At this time, the rotation motor 4
The rainbow metering pump 13 is also driven, and pressurized oil is discharged from the right discharge port 14b, and this discharged oil enters the left pilot circuit gα through the shuttle valve 1oath, returning the servo valve 7 to neutral. to energize.

操作弁9を中立に戻しても旋回体6の慣性により旋回モ
ータ4は回転を続けようとするが、メータリングポンプ
13の吐出油にニジサーボバルブ7は逆方向に切換えら
れて旋回モータ4は停止される。そのとき、旋回モータ
4はポンプ作用を行ない、これによって発生し次圧力は
アキュムレータ15に蓄圧される。
Even if the operating valve 9 is returned to neutral, the swing motor 4 tries to continue rotating due to the inertia of the swing body 6, but the rainbow servo valve 7 is switched in the opposite direction due to the oil discharged from the metering pump 13, and the swing motor 4 continues to rotate. will be stopped. At this time, the swing motor 4 performs a pumping action, and the resulting pressure is accumulated in the accumulator 15.

旋回作業中にエンジン1が停止すると、メインポンプ2
、パイロットポンプ3も停止するが、旋回モータ4はア
キュムレータ15に蓄えられ次エネルギによって旋回し
続ける。
If engine 1 stops during turning work, main pump 2
, the pilot pump 3 also stops, but the swing motor 4 continues to swing with the next energy stored in the accumulator 15.

このときパイロットポンプ3が停止している友めに、こ
のパイロットポンプ3の吐出回路の圧力が低下する次め
、この吐出回路へ減圧弁17及びチェック弁1gを介し
てアキュムレータ15からの圧油が送り込まれる。従っ
てパイロットポンプ3が停止してパイロットポンプ3か
らの吐出圧がなくなっても操作弁9により旋回モータ4
の制御が行なわれる。
At this time, while the pilot pump 3 is stopped, the pressure in the discharge circuit of the pilot pump 3 decreases, and then the pressure oil from the accumulator 15 flows into the discharge circuit via the pressure reducing valve 17 and the check valve 1g. sent. Therefore, even if the pilot pump 3 stops and the discharge pressure from the pilot pump 3 disappears, the operation valve 9 will still operate the swing motor 4.
control is performed.

発明の効果 本発明に工れば、上部旋回体の旋回中にエンジン1が停
止してメインポンプ2及びパイロットポンプ3の吐出圧
がゼロになっても、メイン回路5及びパイロット回路の
圧力がアキュムレータ15によって確保されるから、エ
ンジン1の停止にもかかわらず旋回モータ4を操作弁9
にて制御することができ、旋回中にエンジン1が停止し
たときにおける旋回体6の停止及び傾斜地における旋回
体の自重にさからっての停止を行なうことができる。
Effects of the Invention With the present invention, even if the engine 1 stops while the upper revolving structure is rotating and the discharge pressure of the main pump 2 and pilot pump 3 becomes zero, the pressure in the main circuit 5 and the pilot circuit will be reduced to the accumulator. 15, the swing motor 4 is operated by the operation valve 9 even though the engine 1 is stopped.
The rotating structure 6 can be controlled to stop when the engine 1 stops during turning, and to stop the rotating structure 6 on a slope despite its own weight.

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

第1図は本発明の実施例を示す油圧回路図、第2図は従
来例を示す油圧回路図である。 1はエンジン、2はメインポンプ、3はパイロットポン
プ、4は旋回モータ、5はメイン回路、7はサーボバル
ブ、9は操作弁、15はアキュムレータ。 第1図
FIG. 1 is a hydraulic circuit diagram showing an embodiment of the present invention, and FIG. 2 is a hydraulic circuit diagram showing a conventional example. 1 is an engine, 2 is a main pump, 3 is a pilot pump, 4 is a swing motor, 5 is a main circuit, 7 is a servo valve, 9 is an operating valve, and 15 is an accumulator. Figure 1

Claims (1)

【特許請求の範囲】[Claims] サーボバルブ7にて制御する旋回モータ4にメイン回路
5を介してメインポンプ2とアキュムレータ15を接続
し、また上記サーボバルブ7の入力ポートをパイロット
ポンプ3に接続すると共に、サーボバルブ7の制御部に
操作弁9を介してパイロットポンプ3に接続した建設機
械の旋回液圧回路において、アキュムレータ15を、上
記パイロットポンプ3の吐出圧が所定圧力以下になつた
ときに連通するようにしてパイロットポンプ3の吐出回
路に接続したことを特徴とする建設機械の旋回液圧回路
A main pump 2 and an accumulator 15 are connected to a swing motor 4 controlled by a servo valve 7 via a main circuit 5, and an input port of the servo valve 7 is connected to a pilot pump 3. In the swing hydraulic circuit of the construction machine, which is connected to the pilot pump 3 via the operating valve 9, the accumulator 15 is connected to the pilot pump 3 when the discharge pressure of the pilot pump 3 falls below a predetermined pressure. A swing hydraulic circuit for construction machinery, characterized in that it is connected to a discharge circuit of the construction machine.
JP10157885A 1985-05-15 1985-05-15 Liquid-pressure slewing circuit for construction machine Pending JPS61261535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10157885A JPS61261535A (en) 1985-05-15 1985-05-15 Liquid-pressure slewing circuit for construction machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10157885A JPS61261535A (en) 1985-05-15 1985-05-15 Liquid-pressure slewing circuit for construction machine

Publications (1)

Publication Number Publication Date
JPS61261535A true JPS61261535A (en) 1986-11-19

Family

ID=14304272

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10157885A Pending JPS61261535A (en) 1985-05-15 1985-05-15 Liquid-pressure slewing circuit for construction machine

Country Status (1)

Country Link
JP (1) JPS61261535A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007119438A1 (en) 2006-03-22 2007-10-25 Komatsu Ltd. Operation control circuit for construction machine
CN104019076A (en) * 2014-05-27 2014-09-03 安徽星马专用汽车有限公司 Main oil pump reversing system of closed system pump truck and closed system pump truck
JP2015090193A (en) * 2013-11-06 2015-05-11 キャタピラー エス エー アール エル Fluid pressure circuit, and work machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007119438A1 (en) 2006-03-22 2007-10-25 Komatsu Ltd. Operation control circuit for construction machine
JP2015090193A (en) * 2013-11-06 2015-05-11 キャタピラー エス エー アール エル Fluid pressure circuit, and work machine
CN105765133A (en) * 2013-11-06 2016-07-13 卡特彼勒Sarl Hydraulic pressure circuit and working machine
CN104019076A (en) * 2014-05-27 2014-09-03 安徽星马专用汽车有限公司 Main oil pump reversing system of closed system pump truck and closed system pump truck

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