JPH09184589A - Fault detection device of metal bellows type accumulator - Google Patents
Fault detection device of metal bellows type accumulatorInfo
- Publication number
- JPH09184589A JPH09184589A JP7352996A JP35299695A JPH09184589A JP H09184589 A JPH09184589 A JP H09184589A JP 7352996 A JP7352996 A JP 7352996A JP 35299695 A JP35299695 A JP 35299695A JP H09184589 A JPH09184589 A JP H09184589A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- accumulator
- hydraulic pump
- hydraulic
- metal bellows
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
- F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
- F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means
- F15B1/103—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating means the separating means being bellows
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/20—Accumulator cushioning means
- F15B2201/205—Accumulator cushioning means using gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B2201/00—Accumulators
- F15B2201/30—Accumulator separating means
- F15B2201/315—Accumulator separating means having flexible separating means
- F15B2201/3153—Accumulator separating means having flexible separating means the flexible separating means being bellows
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
- Pipe Accessories (AREA)
- Fluid-Pressure Circuits (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
れる金属ベローズ式アキュムレータの故障検知装置に関
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 a failure detection device for a metal bellows type 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、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４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は内部に
窒素ガス等の封入ガス５を高圧で充填したベローズ６を
有し、ベローズ６の端板７にはベローズ受面９との間を
密閉するシール材８を有する。また、アキュムレータ３
の容器を形成するシェル２０とベローズ６との間には、
油圧脈動に伴うベローズ６の伸縮により圧油２１が流入
する。However, the suppression of pulsation by such a branch pipe has a high frequency dependence, cannot suppress higher-order pulsation, and is not necessarily satisfactory in terms of the pulsation attenuation rate. Et al. Have already developed a pulsation suppressing means in which a metal bellows type accumulator 3 is attached to a discharge conduit 2 of a hydraulic pump 1 as shown in FIG. 4, instead of this branch pipe. The accumulator 3 has a bellows 6 filled with a filling gas 5 such as nitrogen gas at a high pressure inside, and an end plate 7 of the bellows 6 has a seal member 8 for sealing a space between the bellows 6 and a bellows receiving surface 9. Also, accumulator 3
Between the shell 20 and the bellows 6 forming the container of
The pressure oil 21 flows in due to the expansion and contraction of the bellows 6 due to the hydraulic pulsation.
【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】金属ベローズ式アキュ
ムレータ３を油圧ポンプ１の吐出油４の油圧の脈動抑制
に用いた場合、窒素ガス等の封入ガス５を封入したベロ
ーズ６の伸縮によって脈動を吸収するため、伸縮の繰り
返しによるベローズ６の破損による故障が起こることが
ある。従来は、このアキュムレータの故障を、オペレー
タが脈動による騒音が大きくなったことで体感すること
により検知していた。しかしながら、体感による場合に
は、感知が不確実で個人差があるために、アキュムレー
タ３が破損したままで油圧ショベル等の運転を続行して
しまうおそれがある。When the metal bellows type accumulator 3 is used to suppress the pulsation of the hydraulic pressure of the discharge oil 4 of the hydraulic pump 1, the pulsation is absorbed by the expansion and contraction of the bellows 6 in which the sealing gas 5 such as nitrogen gas is sealed. Therefore, the bellows 6 may be damaged due to repeated expansion and contraction, resulting in a failure. Conventionally, the operator has detected the failure of the accumulator by feeling the noise caused by the pulsation. However, in the case of a physical sensation, there is a possibility that the operation of the hydraulic excavator or the like may be continued with the accumulator 3 being damaged due to uncertain sensing and individual differences.
【０００７】本発明は、上記した問題点に鑑み、油圧ポ
ンプを用いる建設機械において、金属ベローズ式アキュ
ムレータを油圧ポンプの吐出油の油圧脈動の抑制に用い
る場合、ベローズ破損によるアキュムレータの故障を確
実に検知できる装置を提供することを目的とする。In view of the above-mentioned problems, the present invention ensures that, in a construction machine using a hydraulic pump, when a metal bellows type accumulator is used to suppress hydraulic pulsation of discharge oil of the hydraulic pump, a failure of the accumulator due to breakage of the bellows is ensured. An object is to provide a device that can detect.
【０００８】[0008]
【課題を解決するための手段】本発明は、金属ベローズ
式アキュムレータにおいては、ベローズの先端とベロー
ズの受面との間にシール材が設けられ、アキュムレータ
内圧力が油圧ポンプの吐出管路の圧力より高い場合は、
ベローズとその受面との間がシール材によって密閉され
ることに着目し、アキュムレータの圧力を検出すること
により、ベローズ破損によるアキュムレータの故障を検
出するものである。According to the present invention, in a metal bellows type accumulator, a sealing material is provided between the tip of the bellows and the receiving surface of the bellows, and the internal pressure of the accumulator is the pressure of the discharge line of the hydraulic pump. If higher,
Focusing on the fact that the space between the bellows and its receiving surface is sealed by a sealing material, the failure of the accumulator due to breakage of the bellows is detected by detecting the pressure of the accumulator.
【０００９】すなわち、本願の第１の発明は、油圧ポン
プを用いた建設機械において、油圧ポンプの吐出油の油
圧の脈動の抑制に用いる金属ベローズ式アキュムレータ
に、アキュムレータ内の圧力を検出し表示する圧力検出
表示装置を取付けたことを特徴とする。That is, according to the first aspect of the present invention, in a construction machine using a hydraulic pump, the pressure in the accumulator is detected and displayed on a metal bellows type accumulator used for suppressing the pulsation of the hydraulic pressure of the oil discharged from the hydraulic pump. It is characterized in that a pressure detection display device is attached.
【００１０】本願の第２の発明は、油圧ポンプの吐出油
の油圧の脈動の抑制に用いる金属ベローズ式アキュムレ
ータ内の圧力Ｐ1を検出する圧力センサと、油圧ポンプ
の吐出管路の油圧Ｐ2を検出する圧力センサと、前記圧
力Ｐ1、Ｐ2の比較および前記圧力Ｐ1とアキュムレータ
のクラッキング圧Ｐ3とを比較する演算手段と、該演算
手段による演算結果がＰ1＞Ｐ2でかつＰ1＞Ｐ3である時
に故障を表示する故障表示手段とを設けたことを特徴と
する。A second invention of the present application is a pressure sensor for detecting a pressure P 1 in a metal bellows type accumulator used for suppressing hydraulic pressure pulsation of oil discharged from a hydraulic pump, and a hydraulic pressure P 2 in a discharge line of a hydraulic pump. And a calculation means for comparing the pressures P 1 and P 2 and comparing the pressure P 1 with the cracking pressure P 3 of the accumulator, and the calculation result by the calculation means is P 1 > P 2 . A failure display means for displaying a failure when P 1 > P 3 is provided.
【００１１】[0011]
【作用】油圧ポンプの吐出管路に設けられたアクチュエ
ータの作動により吐出管路の油圧が高圧になると、アキ
ュムレータのクラッキングが生じ、ベローズが封入ガス
と共に圧縮される。この時、シェル内の圧力は、クラッ
キング圧より高い高圧となる。この状態でベローズが破
損すると、シェル内の高圧油がベローズ内に流入し、ベ
ローズが膨張してベローズとその受面との間がシール材
を介して密閉され、アキュムレータ内には、それまでに
アキュムレータに加わった最高圧に近い高圧が残留した
ままとなる。When the hydraulic pressure in the discharge pipe becomes high due to the operation of the actuator provided in the discharge pipe of the hydraulic pump, the accumulator is cracked and the bellows is compressed together with the enclosed gas. At this time, the pressure inside the shell becomes higher than the cracking pressure. If the bellows is damaged in this state, the high-pressure oil in the shell will flow into the bellows, the bellows will expand and the space between the bellows and its receiving surface will be sealed via the sealing material, and the accumulator will not be High pressure close to the maximum pressure applied to the accumulator remains.
【００１２】本願の第１の発明においては、アキュムレ
ータの圧力を検知して表示する装置を設けたので、油圧
ポンプのアイドル運転中に等において、表示されている
圧力値がクラッキング圧よりかなり高いことをオペレー
タ等が目視によって確認することにより、ベローズの破
損が判断できる。In the first invention of the present application, since the device for detecting and displaying the pressure of the accumulator is provided, the displayed pressure value is considerably higher than the cracking pressure during the idle operation of the hydraulic pump. By visually confirming the above, the breakage of the bellows can be determined.
【００１３】本願の第２の発明の場合には、前述のよう
にベローズ破損によりアキュムレータ内圧力Ｐ1に高圧
が残留し、このため、該アキュムレータ内の圧力Ｐ1が
油圧ポンプの吐出管路の圧力Ｐ2およびクラッキング圧
Ｐ3より所定時間高くなっていることを演算手段による
演算によって判定した場合、アキュムレータの故障と判
断して故障表示手段により表示する。In the case of the second invention of the present application, a high pressure remains in the accumulator internal pressure P 1 due to the bellows breakage as described above, and therefore the pressure P 1 in the accumulator is in the discharge pipe line of the hydraulic pump. When it is determined by the calculation means that the pressure is higher than the pressure P 2 and the cracking pressure P 3 for the predetermined time, it is determined that the accumulator is in failure, and the failure display means displays it.
【００１４】[0014]
【実施例】図１（Ａ）は前記本願の第１の発明の一実施
例を示す断面図であり、１０は本発明によりアキュムレ
ータ３の内部圧力を検出、表示するために設けた圧力検
出表示装置である。図１（Ａ）のベローズ端板７は、油
圧ポンプ１の吐出管路２の油圧Ｐ2がアキュムレータ３
のクラッキング圧Ｐ3より高い時の状態であり、封入ガ
ス５を充填したベローズ６による緩衝作用により、油圧
の脈動を吸収している状態である。端板７の２点鎖線で
示す状態は、前記吐出管路２の油圧Ｐ2がクラッキング
圧Ｐ3より低い時の状態である。該クラッキング圧Ｐ
3は、ガス５の封入圧と、シール材９の内部の端板面積
により変わるが、例えば油圧ショベルにおいて、吐出管
路２の最高圧が例えば３５０ｋｇ／ｃｍ2に設定されて
いる場合、ガス５の封入圧を例えば８０〜１００ｋｇ／
ｃｍ2とし、クラッキング圧は例えば１１０〜１３０ｋ
ｇ／ｃｍ2程度に設定される。1 (A) is a sectional view showing an embodiment of the first invention of the present application, and 10 is a pressure detection display provided for detecting and displaying the internal pressure of the accumulator 3 according to the present invention. It is a device. In the bellows end plate 7 of FIG. 1A, the hydraulic pressure P 2 of the discharge pipe line 2 of the hydraulic pump 1 is stored in the accumulator 3
Is higher than the cracking pressure P 3 , and the pulsation of hydraulic pressure is absorbed by the buffering action of the bellows 6 filled with the enclosed gas 5. The state indicated by the chain double-dashed line of the end plate 7 is a state when the hydraulic pressure P 2 of the discharge conduit 2 is lower than the cracking pressure P 3 . The cracking pressure P
3 varies depending on the filling pressure of the gas 5 and the area of the end plate inside the sealing material 9. For example, in a hydraulic excavator, when the maximum pressure of the discharge pipe line 2 is set to 350 kg / cm 2 , the gas 5 The filling pressure of, for example, 80 to 100 kg /
cm 2 and the cracking pressure is 110 to 130 k, for example.
g / cm 2 .
【００１５】図１（Ｂ）はベローズ６に破損箇所１１が
生じた場合の状態を示す図であり、この場合には、封入
ガス５の圧力、すなわち圧力検出表示装置１０において
検出される圧力Ｐ1は、それまでにアキュムレータ３に
加わった油圧のうちの最高圧に近い値となる。FIG. 1 (B) is a view showing a state where the bellows 6 has a damaged portion 11. In this case, the pressure of the enclosed gas 5, that is, the pressure P detected by the pressure detection display device 10. 1 is a value close to the maximum pressure of the hydraulic pressures applied to the accumulator 3 up to that point.
【００１６】従って、圧力検出表示装置１０に表示され
る値が前もって知らされているクラッキング圧Ｐ3より
高い値で止まっている時には、故障と判断できる。な
お、圧力検出表示装置１０としては、図示のようなアナ
ログ式の圧力計のみではなく、デジタル式のものなど、
種々の方式、構造のものが用いられ、圧力を表示する表
示部を分離して運転室に設置してもよい。Therefore, when the value displayed on the pressure detection display device 10 stops at a value higher than the cracking pressure P 3 which was previously known, it can be determined that the failure has occurred. The pressure detection display device 10 is not limited to the analog type pressure gauge shown in the drawing, but may be a digital type pressure gauge.
Various types and structures may be used, and the display unit for displaying the pressure may be separately installed in the cab.
【００１７】図２（Ａ）は前記本願の第２の発明の一実
施例の要部構成を示す断面図、図２（Ｂ）は本実施例の
全体構成を示す図である。本実施例は、アキュムレータ
３内の圧力Ｐ1と、吐出管路２の油圧Ｐ2をそれぞれ電気
信号として検出する圧力センサ１２、１３を設ける共
に、油圧ショベルに搭載されたコンピュータあるいは電
気回路により構成される演算手段１４により、予め設定
されているクラッキング圧Ｐ3と、前記圧力センサ１
２、１３により検出される圧力Ｐ1、Ｐ2とから、比較演
算により、アキュムレータ３の故障を検出して故障表示
手段１５により表示するようにしたものである。なお、
本実施例においては、該故障表示手段１５がランプであ
る場合を示しているが、運転室に設置した表示画面にお
ける文字表示や故障番号表示等によって故障を表示する
ようにしてもよい。FIG. 2 (A) is a sectional view showing the construction of the essential part of an embodiment of the second invention of the present application, and FIG. 2 (B) is a drawing showing the overall construction of this embodiment. In this embodiment, pressure sensors 12 and 13 for detecting the pressure P 1 in the accumulator 3 and the hydraulic pressure P 2 of the discharge pipe line 2 as electric signals are provided, and are constituted by a computer or an electric circuit mounted on a hydraulic excavator. The cracking pressure P 3 preset by the calculating means 14 and the pressure sensor 1
A failure of the accumulator 3 is detected by the comparison operation from the pressures P 1 and P 2 detected by 2 and 13 and displayed by the failure display means 15. In addition,
In the present embodiment, the case where the failure display means 15 is a lamp is shown, but the failure may be displayed by character display or failure number display on the display screen installed in the cab.
【００１８】図３は図２の実施例の動作の流れを示すフ
ロー図であり、ステップＳ１〜Ｓ６から理解されるよう
に、アキュムレータ３内の圧力Ｐ1が吐出管路２の油圧
Ｐ2より高く、かつクラッキング圧Ｐ3より高い状態が所
定時間（例えば１分）続いた場合には、故障表示手段１
５としてのランプを点灯させる。この実施例において
は、アキュムレータ３内の圧力Ｐ1が高い状態の時間計
測を、比較演算の時間間隔（例えば２０ｍｓ）の演算回
数Ｎで行い、その値が所定時間に相当する回数Ｔ（例え
ば３０００回）に達した時に故障と判断しているが、別
の時間計測手段を用いてもよい。FIG. 3 is a flow chart showing the operation flow of the embodiment of FIG. 2. As understood from steps S1 to S6, the pressure P 1 in the accumulator 3 is greater than the oil pressure P 2 in the discharge pipe line 2. If the state of being higher than the cracking pressure P 3 continues for a predetermined time (for example, 1 minute), the failure display means 1
Turn on the lamp as 5. In this embodiment, the time when the pressure P 1 in the accumulator 3 is high is measured at the number of times N of the comparison calculation time interval (for example, 20 ms), and the number of times T (for example, 3000) corresponds to the predetermined time. However, another time measuring means may be used.
【００１９】このように、圧力センサ１２、１３による
圧力検出と、演算手段１４による圧力比較により、自動
的にアキュムレータ３の故障を検出し、故障発生時には
これを表示することにより、故障発生がオペレータに即
座に認識される。As described above, the failure detection of the accumulator 3 is automatically detected by the pressure detection by the pressure sensors 12 and 13 and the pressure comparison by the calculation means 14, and the failure occurrence is displayed by the operator. Is immediately recognized by.
【００２０】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.
【００２１】[0021]
【発明の効果】請求項１によれば、ベローズの破損によ
り高圧が残留するアキュムレータの圧力を検出し表示す
るようにしたので、アキュムレータの故障を確実に把握
でき、アキュムレータの故障に迅速に対応できる。According to the first aspect of the present invention, the pressure of the accumulator in which a high pressure remains due to the breakage of the bellows is detected and displayed, so that the failure of the accumulator can be surely grasped and the failure of the accumulator can be promptly dealt with. .
【００２２】請求項２によれば、アキュムレータの故障
表示が自動的に行われるので、オペレータはより確実に
アキュムレータの故障を知ることができる。According to the second aspect, since the failure display of the accumulator is automatically performed, the operator can know the failure of the accumulator more reliably.
【図面の簡単な説明】[Brief description of the drawings]
【図１】（Ａ）は本願の第１の発明の一実施例を示す断
面図、（Ｂ）は該実施例におけるアキュムレータの故障
時の状態を示す断面図である。FIG. 1A is a cross-sectional view showing an embodiment of the first invention of the present application, and FIG. 1B is a cross-sectional view showing a state of an accumulator in the embodiment at the time of failure.
【図２】（Ａ）は本願の第２の発明の一実施例の要部構
成を示す断面図、（Ｂ）は該実施例の全体構成を示す図
である。FIG. 2A is a cross-sectional view showing a main structure of an embodiment of the second invention of the present application, and FIG. 2B is a view showing the overall structure of the embodiment.
【図３】図２の実施例の動作の流れを示すフロー図であ
る。FIG. 3 is a flowchart showing a flow of operations of the embodiment shown in FIG.
【図４】従来のアキュムレータを示す断面図である。FIG. 4 is a sectional view showing a conventional accumulator.
１：油圧ポンプ、２：吐出管路、３：アキュムレータ、
４：吐出油、５：封入ガス、６：ベローズ、７：端板、
８：シール材、９：ベローズ受面、１０：圧力検出表示
装置、１１：破損箇所、１２、１３：圧力センサ、１
４：演算手段、１５：故障表示手段、２０：シェル、２
１：圧油1: hydraulic pump, 2: discharge pipe line, 3: accumulator,
4: discharge oil, 5: enclosed gas, 6: bellows, 7: end plate,
8: Seal material, 9: Bellows receiving surface, 10: Pressure detection display device, 11: Damaged part, 12, 13: Pressure sensor, 1
4: computing means, 15: failure display means, 20: shell, 2
1: Pressure oil
Claims (2)
ローズ式アキュムレータに、アキュムレータ内の圧力を
検出し表示する圧力検出表示装置を取付けたことを特徴
とする金属ベローズ式アキュムレータの故障検知装置。1. In a construction machine using a hydraulic pump, a metal bellows type accumulator used for suppressing pulsation of hydraulic pressure of oil discharged from the hydraulic pump is equipped with a pressure detection display device for detecting and displaying the pressure in the accumulator. Failure detection device for metal bellows type accumulator.
ローズ式アキュムレータ内の圧力Ｐ1を検出する圧力セ
ンサと、 油圧ポンプの吐出管路の油圧Ｐ2を検出する圧力センサ
と、 前記圧力Ｐ1 、Ｐ2の比較および前記圧力Ｐ1とアキュム
レータのクラッキング圧Ｐ3とを比較する演算手段と、 該演算手段による演算結果がＰ1＞Ｐ2でかつＰ1＞Ｐ3で
ある時に故障を表示する故障表示手段とを設けたことを
特徴とする金属ベローズ式アキュムレータの故障検知装
置。2. In a construction machine using a hydraulic pump, a pressure sensor for detecting a pressure P 1 in a metal bellows type accumulator used for suppressing hydraulic pressure pulsation of oil discharged from the hydraulic pump, and a discharge pipe of the hydraulic pump. A pressure sensor for detecting the oil pressure P 2 , a calculation means for comparing the pressures P 1 and P 2 and a comparison between the pressure P 1 and the cracking pressure P 3 of the accumulator, and a calculation result by the calculation means is P 1 > P A failure detection device for a metal bellows type accumulator, characterized in that it is provided with a failure display means for displaying a failure when 2 and P 1 > P 3 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35299695A JP3399731B2 (en) | 1995-12-28 | 1995-12-28 | Metal bellows type accumulator failure detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35299695A JP3399731B2 (en) | 1995-12-28 | 1995-12-28 | Metal bellows type accumulator failure detection device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09184589A true JPH09184589A (en) | 1997-07-15 |
| JP3399731B2 JP3399731B2 (en) | 2003-04-21 |
Family
ID=18427865
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35299695A Expired - Fee Related JP3399731B2 (en) | 1995-12-28 | 1995-12-28 | Metal bellows type accumulator failure detection device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3399731B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002310101A (en) * | 2001-04-09 | 2002-10-23 | Aisin Seiki Co Ltd | Abnormality detecting device of bellows type accumulator for pressurized fluid |
| FR2830050A1 (en) * | 2001-09-21 | 2003-03-28 | Bosch Gmbh Robert | Method of monitoring pressure regulator for motor vehicle fuel feed involves sensing pressure and comparing it to target curve |
| JP2006200625A (en) * | 2005-01-20 | 2006-08-03 | Yamada Electric Mfg Co Ltd | Accumulator and pump control device |
| KR101368830B1 (en) * | 2012-06-01 | 2014-03-03 | 삼성중공업 주식회사 | Damper |
| EP2905479A1 (en) * | 2014-02-06 | 2015-08-12 | Goodrich Corporation | System and method of determining an accumulator status |
| WO2023234630A1 (en) * | 2022-06-02 | 2023-12-07 | 레디로버스트머신 주식회사 | Diagnostic device and method for determining state of accumulator |
-
1995
- 1995-12-28 JP JP35299695A patent/JP3399731B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002310101A (en) * | 2001-04-09 | 2002-10-23 | Aisin Seiki Co Ltd | Abnormality detecting device of bellows type accumulator for pressurized fluid |
| JP4710159B2 (en) * | 2001-04-09 | 2011-06-29 | 株式会社アドヴィックス | Abnormality detector for bellows type accumulator for pressurized fluid |
| FR2830050A1 (en) * | 2001-09-21 | 2003-03-28 | Bosch Gmbh Robert | Method of monitoring pressure regulator for motor vehicle fuel feed involves sensing pressure and comparing it to target curve |
| JP2006200625A (en) * | 2005-01-20 | 2006-08-03 | Yamada Electric Mfg Co Ltd | Accumulator and pump control device |
| KR101368830B1 (en) * | 2012-06-01 | 2014-03-03 | 삼성중공업 주식회사 | Damper |
| EP2905479A1 (en) * | 2014-02-06 | 2015-08-12 | Goodrich Corporation | System and method of determining an accumulator status |
| US9533667B2 (en) | 2014-02-06 | 2017-01-03 | Goodrich Corporation | System and method of determining accumulator status |
| WO2023234630A1 (en) * | 2022-06-02 | 2023-12-07 | 레디로버스트머신 주식회사 | Diagnostic device and method for determining state of accumulator |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3399731B2 (en) | 2003-04-21 |
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