JPH09184591A - Operation controller for accumulator - Google Patents
Operation controller for accumulatorInfo
- Publication number
- JPH09184591A JPH09184591A JP7352997A JP35299795A JPH09184591A JP H09184591 A JPH09184591 A JP H09184591A JP 7352997 A JP7352997 A JP 7352997A JP 35299795 A JP35299795 A JP 35299795A JP H09184591 A JPH09184591 A JP H09184591A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- accumulator
- hydraulic
- oil temperature
- hydraulic pump
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pipe Accessories (AREA)
- Reciprocating Pumps (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、油圧ショベル等の掘削
機、クレーン、杭打機等のように油圧ポンプを搭載した
建設機械に使用され、油圧ポンプの作動により発生する
吐出油の油圧の脈動による騒音を抑制するために設置さ
れるアキュムレータの作動制御装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in construction machines equipped with hydraulic pumps such as excavators such as hydraulic excavators, cranes, and pile driving machines. The present invention relates to an operation control device for an accumulator installed to suppress noise due to pulsation.
【０００２】[0002]
【従来の技術】油圧ショベル等の建設機械の本体に搭載
される油圧ポンプにおいては、油圧ポンプの回転に伴
い、作動油の吐出口に対面するシリンダが切り換わる毎
に、油圧ポンプの吐出管路の油圧が、シリンダ側の油圧
より高くなる状態が生じ、その度毎に弁板において作動
油の逆流が生じ、その逆流が油圧ポンプの吐出管路に油
圧の脈動として管路に伝播する。この油圧の脈動の周波
数は、シリンダ本数に油圧ポンプの回転数を乗じたもの
となり、例えばシリンダ本数が７本、回転数が３０００
ｒｐｍで作動している場合には、脈動の周波数は３５０
Ｈｚとなる。このような脈動は管路等における振動や共
振を生じさせ、これにより騒音が発生する。2. Description of the Related Art In a hydraulic pump mounted on the body of a construction machine such as a hydraulic excavator, a discharge line of the hydraulic pump is switched every time the cylinder facing the discharge port of the hydraulic oil is switched as the hydraulic pump rotates. Occurs every time the hydraulic pressure is higher than the hydraulic pressure on the cylinder side, and the backflow of the hydraulic oil occurs in the valve plate each time, and the backflow propagates to the discharge line of the hydraulic pump as pulsation of the hydraulic pressure to the line. The frequency of the pulsation of the hydraulic pressure is obtained by multiplying the number of cylinders by the number of rotations of the hydraulic pump. For example, the number of cylinders is 7 and the number of rotations is 3000.
When operating at rpm, the pulsation frequency is 350
Hz. Such pulsation causes vibration or resonance in a pipe or the like, thereby generating noise.
【０００３】このような騒音を発生させる脈動を防止す
るため、従来は、油圧ポンプの吐出口近傍の吐出管路
に、脈動の波長の１／４の長さの鋼管またはゴム管から
なる先端閉塞の枝管を分岐して設け、その枝管におい
て、先端に向かう脈動波と、反射して戻る脈動波とが打
ち消し合うことにより、脈動を抑制していた。Conventionally, in order to prevent such a pulsation that generates noise, a discharge pipe near the discharge port of a hydraulic pump has a distal end made of a steel pipe or a rubber pipe having a length of 1/4 of the pulsation wavelength. Is provided in a branched manner, and in the branched pipe, the pulsation wave directed toward the tip and the pulsation wave reflected and returned cancel each other, thereby suppressing pulsation.
【０００４】しかしながら、このような枝管による脈動
の抑制は、周波数依存性が高い上、高次の脈動を抑制で
きず、反対に増幅する場合もあり、また、脈動の減衰率
の面でも必ずしも満足できるものではないため、本発明
者等は、この枝管の代わりに、脈動抑制手段として、図
２に示すように、油圧ポンプ１の吐出管路２に金属ベロ
ーズ式アキュムレータ３を取付けたものを既に開発して
いる。該アキュムレータ３は窒素ガス等の封入ガスを高
圧で充填したベローズを有するものである。４は油圧シ
リンダや油圧モータ等のアクチュエータ群である。However, the suppression of pulsation by such a branch pipe has a high frequency dependency, cannot suppress higher-order pulsation, and may amplify it on the contrary, and in terms of the attenuation rate of pulsation, it is not always necessary. Since this is not satisfactory, the present inventors have installed a metal bellows type accumulator 3 on the discharge pipe line 2 of the hydraulic pump 1 as a pulsation suppressing means instead of this branch pipe, as shown in FIG. Have already developed. The accumulator 3 has a bellows which is filled with a filling gas such as nitrogen gas at a high pressure. Reference numeral 4 denotes an actuator group such as a hydraulic cylinder and a hydraulic motor.
【０００５】このような金属ベロース式アキュムレータ
３を用いれば、該アキュムレータ３は、高周波応答性が
よく、１０００Ｈｚ程度の周波数に応答できる上、脈動
減衰率が高いから、脈動を充分に抑制することが可能と
なる。When such a metal bellows type accumulator 3 is used, the accumulator 3 has good high frequency response, can respond to a frequency of about 1000 Hz, and has a high pulsation damping rate, so that pulsation can be sufficiently suppressed. It will be possible.
【０００６】[0006]
【発明が解決しようとする課題】寒冷地において建設機
械を作動させる場合、始動時から作動油の油温がある程
度上昇するまでは、油温が低いために、粘度が高く、そ
のためにアクチュエータに至るまでの弁の絞り等におけ
る損失が大となり、操作レバーを操作してからアクチュ
エータが動作するまで若干の遅れ（応答遅れ）が生じ
る。このような応答遅れは、前記油圧脈動の抑制に枝管
の代わりにアキュムレータ３を用いた場合、さらに大き
くなる。なぜならば、作動油が一部アキュムレータ３に
分流するからである。When a construction machine is operated in a cold region, the viscosity is high because the oil temperature is low until the oil temperature of the hydraulic oil rises to a certain extent from the time of starting, and therefore the actuator reaches the actuator. There is a large loss in the valve throttling, etc., and there is a slight delay (response delay) from the operation of the operating lever to the operation of the actuator. Such a response delay is further increased when the accumulator 3 is used instead of the branch pipe to suppress the hydraulic pulsation. This is because the hydraulic oil is partly diverted to the accumulator 3.
【０００７】本発明は、上記した問題点に鑑み、油圧ポ
ンプを用い、かつ油圧脈動を抑制するためにアキュムレ
ータを用いる建設機械において、寒冷地における作業開
始時のアクチュエータの応答遅れを少なくすることがで
きるアキュムレータの作動制御装置を提供することを目
的とする。In view of the above problems, the present invention can reduce the response delay of the actuator at the start of work in cold regions in a construction machine using a hydraulic pump and an accumulator for suppressing hydraulic pulsation. It is an object of the present invention to provide an operation control device for an accumulator that can be performed.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、油圧ポンプを用いた建設機械において、
油圧ポンプの吐出管路と油圧脈動抑制用アキュムレータ
との間にオンオフ弁を設けると共に、前記油温が所定温
度以下である場合にオンオフ弁を遮断位置に保持する弁
制御手段を設けたことを特徴とする。In order to achieve the above-mentioned object, the present invention provides a construction machine using a hydraulic pump,
An on / off valve is provided between the discharge line of the hydraulic pump and the hydraulic pulsation suppressing accumulator, and valve control means is provided for holding the on / off valve in the cutoff position when the oil temperature is equal to or lower than a predetermined temperature. And
【０００９】[0009]
【作用】建設機械の作業開始時において、油温が所定温
度に達していない間は、オンオフ弁が遮断位置にあるた
め、アキュムレータは吐出管路から遮断されている。そ
のため、応答遅れが生じ易い油温の低温時には、油圧ポ
ンプの吐出油がアキュムレータのクラッキング圧以上に
なってもアキュムレータに分流することはなく、従って
寒冷地等における作業開始時のアキュムレータへの吐出
油の分流による応答遅れが、油温が低温であることによ
るアクチュエータの応答遅れに加わることがなくなる。When the work of the construction machine is started, the accumulator is cut off from the discharge line because the on / off valve is in the cutoff position while the oil temperature has not reached the predetermined temperature. Therefore, when the oil temperature is low enough to cause a response delay, even if the discharge oil of the hydraulic pump exceeds the cracking pressure of the accumulator, it does not flow to the accumulator. The response delay due to the shunt current does not add to the response delay of the actuator due to the low oil temperature.
【００１０】[0010]
【実施例】図１は本発明の一実施例を示す油圧電気回路
であり、５は本発明によりアキュムレータ３と油圧ポン
プ１の吐出管路２との間の管路に挿入した電磁弁でなる
オンオフ弁、６は油圧ポンプ１を含む油圧回路の作動油
の油温を検出する油温センサであり、本例は油タンク８
内の油温を検出する例を示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a hydraulic electric circuit showing an embodiment of the present invention, and 5 is an electromagnetic valve inserted in a line between an accumulator 3 and a discharge line 2 of a hydraulic pump 1 according to the present invention. An on / off valve 6 is an oil temperature sensor for detecting the oil temperature of hydraulic oil in a hydraulic circuit including the hydraulic pump 1. In this example, an oil tank 8 is provided.
An example of detecting the oil temperature inside is shown.
【００１１】７は油温センサ６により検出される油温に
よりオンオフ弁５の切換を行う弁駆動回路であり、本例
の弁駆動回路７は、全体を電気回路により構成するか、
あるいは油圧ショベル等の建設機械に搭載したコンピュ
ータとその出力により電源を投入、遮断する回路により
構成されるものである。油温センサ６と弁駆動回路７と
により弁制御手段９を構成する。Reference numeral 7 is a valve drive circuit for switching the on / off valve 5 according to the oil temperature detected by the oil temperature sensor 6. The valve drive circuit 7 of this embodiment is constructed as an entire electric circuit,
Alternatively, it is composed of a computer mounted on a construction machine such as a hydraulic excavator and a circuit for turning on / off the power by its output. The oil temperature sensor 6 and the valve drive circuit 7 constitute a valve control means 9.
【００１２】該弁制御手段９は、油温が予め設定された
所定温度以下である場合には、オンオフ弁５を図示の遮
断位置のままとしておき、所定温度に達すると、オンオ
フ弁５のソレノイド５ａに通電してオンオフ弁５を連通
位置に切り換える。なお、設定温度は、アクチュエータ
の応答遅れが生じなくなる油温となる３０℃程度に設定
される。The valve control means 9 leaves the on / off valve 5 in the shut-off position shown in the figure when the oil temperature is equal to or lower than a preset predetermined temperature, and when the predetermined temperature is reached, the solenoid of the on / off valve 5 is closed. 5a is energized to switch the on / off valve 5 to the communicating position. The set temperature is set to about 30 ° C., which is the oil temperature at which the response delay of the actuator does not occur.
【００１３】このような制御を行えば、寒冷地で作業す
る場合、作業開始からしばらくの時間が経過するまで
は、油温が所定温度以下のままであるため、オンオフ弁
５のソレノイド５ａには通電されず、オンオフ弁５は遮
断位置にある。従って、作業開始時における油温が低温
であることによる応答遅れがある間は、アキュムレータ
３が吐出管路２に接続されることによる応答遅れが加わ
らない。With such control, when working in a cold region, the oil temperature remains below a predetermined temperature until a certain time elapses from the start of the work. Therefore, the solenoid 5a of the on / off valve 5 is There is no energization and the on / off valve 5 is in the shut-off position. Therefore, while there is a response delay due to the low oil temperature at the start of work, the response delay due to the accumulator 3 being connected to the discharge pipe line 2 is not added.
【００１４】作業時間が経過して油温が上昇して来る
と、応答遅れも減少する。油温が所定温度以上になる
と、弁駆動回路７は、ソレノイド５ａに通電し、オンオ
フ弁５を図示の遮断位置から連通位置に切り換える。こ
れにより、アキュムレータ３により油圧脈動を防止した
状態で作業が行われる。As the working temperature elapses and the oil temperature rises, the response delay also decreases. When the oil temperature becomes equal to or higher than the predetermined temperature, the valve drive circuit 7 energizes the solenoid 5a to switch the on / off valve 5 from the cut-off position shown to the communication position. As a result, the work is performed in a state where the hydraulic pressure pulsation is prevented by the accumulator 3.
【００１５】上記実施例においては、油温センサ６と弁
駆動回路７とを分離したが、油温センサ６自体に設定温
度における電気回路のオンオフ機能を持たせれば、コン
ピュータは温度の比較回路やコンピュータの使用は不要
である。In the above embodiment, the oil temperature sensor 6 and the valve drive circuit 7 are separated. However, if the oil temperature sensor 6 itself has an on / off function of an electric circuit at a set temperature, the computer can operate as a temperature comparison circuit or a temperature comparison circuit. No computer usage required.
【００１６】本発明の装置は、油圧ショベルやローダシ
ョベル等の掘削機のみならず、クレーン、杭打機等、油
圧ポンプを使用する他の種々の建設機械に用いることが
できる。The apparatus of the present invention can be used not only for excavators such as hydraulic excavators and loader excavators, but also for various other construction machines using hydraulic pumps such as cranes and pile drivers.
【００１７】[0017]
【発明の効果】本発明によれば、油圧脈動を抑制するア
キュムレータを、油温が低温である間は油圧ポンプの吐
出管路からオンオフ弁により遮断しておくようにしたの
で、建設機械を用いた作業を寒冷地において行う場合、
アキュムレータを設けたことによる応答遅れが加わらな
いため、油温が低温である場合の応答遅れを最小限に押
さえることができる。According to the present invention, the accumulator for suppressing hydraulic pulsation is cut off from the discharge line of the hydraulic pump by the on / off valve while the oil temperature is low, so that the construction machine is used. If you perform the work in cold climates,
Since the response delay due to the provision of the accumulator is not added, it is possible to minimize the response delay when the oil temperature is low.
【図１】本発明によるアキュムレータの作動制御装置の
一実施例を示す油圧電気回路図である。FIG. 1 is a hydraulic electric circuit diagram showing an embodiment of an operation control device for an accumulator according to the present invention.
【図２】油圧脈動抑制にアキュムレータを用いた従来の
油圧回路図である。FIG. 2 is a conventional hydraulic circuit diagram in which an accumulator is used to suppress hydraulic pressure pulsation.
１：油圧ポンプ、２：吐出管路、３：アキュムレータ、
４：アクチュエータ群、５：オンオフ弁、６：油温セン
サ、７：弁駆動回路、８：油タンク、９：弁制御手段1: hydraulic pump, 2: discharge pipe line, 3: accumulator,
4: Actuator group, 5: On-off valve, 6: Oil temperature sensor, 7: Valve drive circuit, 8: Oil tank, 9: Valve control means
Claims (1)
との間にオンオフ弁を設けると共に、 前記油温が所定温度以下である場合にオンオフ弁を遮断
位置に保持する弁制御手段を設けたことを特徴とするア
キュムレータの作動制御装置。1. In a construction machine using a hydraulic pump, an on / off valve is provided between a discharge line of the hydraulic pump and an accumulator for suppressing hydraulic pulsation, and the on / off valve is provided when the oil temperature is below a predetermined temperature. An operation control device for an accumulator, characterized in that valve control means for holding the valve in a shut-off position is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7352997A JPH09184591A (en) | 1995-12-28 | 1995-12-28 | Operation controller for accumulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7352997A JPH09184591A (en) | 1995-12-28 | 1995-12-28 | Operation controller for accumulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09184591A true JPH09184591A (en) | 1997-07-15 |
Family
ID=18427872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7352997A Pending JPH09184591A (en) | 1995-12-28 | 1995-12-28 | Operation controller for accumulator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09184591A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010134369A1 (en) * | 2009-05-22 | 2010-11-25 | 国際計測器株式会社 | Hydraulic system and general-purpose test device |
| CN103994107A (en) * | 2014-06-06 | 2014-08-20 | 山东中川液压有限公司 | Hydraulic power energy accumulator energy charging device |
| JP2017203518A (en) * | 2016-05-12 | 2017-11-16 | 株式会社神戸製鋼所 | Hydraulic control device for work machine |
-
1995
- 1995-12-28 JP JP7352997A patent/JPH09184591A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010134369A1 (en) * | 2009-05-22 | 2010-11-25 | 国際計測器株式会社 | Hydraulic system and general-purpose test device |
| JP2011007781A (en) * | 2009-05-22 | 2011-01-13 | Kokusai Keisokki Kk | Hydraulic system and universal testing device |
| US8596058B2 (en) | 2009-05-22 | 2013-12-03 | Kokusai Keisokuki Kabushiki Kaisha | Hydraulic system and universal testing machine |
| CN103994107A (en) * | 2014-06-06 | 2014-08-20 | 山东中川液压有限公司 | Hydraulic power energy accumulator energy charging device |
| JP2017203518A (en) * | 2016-05-12 | 2017-11-16 | 株式会社神戸製鋼所 | Hydraulic control device for work machine |
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