JP3399731B2 - Metal bellows type accumulator failure detection device - Google Patents
Metal bellows type accumulator failure detection deviceInfo
- Publication number
- JP3399731B2 JP3399731B2 JP35299695A JP35299695A JP3399731B2 JP 3399731 B2 JP3399731 B2 JP 3399731B2 JP 35299695 A JP35299695 A JP 35299695A JP 35299695 A JP35299695 A JP 35299695A JP 3399731 B2 JP3399731 B2 JP 3399731B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- accumulator
- hydraulic
- bellows
- failure
- 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.)
- Expired - Fee Related
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)
- Pipe Accessories (AREA)
- Fluid-Pressure Circuits (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Description
【発明の詳細な説明】
【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。
【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。
【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。
【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。
【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。
【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を体感すること
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。
【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
実かつ即座に検知できる装置を提供することを目的とす
る。
【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。
【０００９】すなわち、本発明は、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。
【００１０】
【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。
【００１１】本発明の場合には、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。
【００１２】
【実施例】図１（Ａ）は前記本発明の技術的背景を説明
する断面図であり、１０はアキュムレータ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Ｐ３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１１０〜１３０ｋｇ／ｃｍ２程度に
設定される。
【００１３】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。
【００１４】図２（Ａ）は本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１２、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。
【００１５】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
１５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。
【００１６】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。
【００１７】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。
【００１８】
【発明の効果】本発明によれば、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か
つ即座にアキュムレータの故障を知ることができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for a construction machine equipped with a hydraulic pump, such as an excavator such as a hydraulic excavator, a crane, a pile driver, and the like. The present invention relates to a failure detection device for a metal bellows type accumulator that is installed to suppress noise due to pulsation of hydraulic pressure of discharge oil generated by the operation of a hydraulic pump. 2. Description of the Related Art In a hydraulic pump mounted on a main body of a construction machine such as a hydraulic shovel or the like, every time a cylinder facing a discharge port of hydraulic oil is switched with the rotation of the hydraulic pump, the hydraulic pump is turned on. A state in which the hydraulic pressure of the discharge line becomes higher than the hydraulic pressure of the cylinder side occurs, and each time a backflow of hydraulic oil occurs in the valve plate, and the backflow propagates to the discharge line of the hydraulic pump as a pulsation of hydraulic pressure. I do. The frequency of the hydraulic pulsation is obtained by multiplying the number of cylinders by the number of rotations of the hydraulic pump. For example, the number of cylinders is seven and the number of rotations is 3000.
When operating at rpm, the frequency of the pulsation is 350
Hz. Such pulsation causes vibration or resonance in a pipe or the like, thereby generating noise. 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. However, such suppression of pulsation by the branch pipe is highly frequency-dependent, cannot suppress high-order pulsation, and is not always satisfactory in terms of pulsation attenuation rate. Have already developed a hydraulic pump 1 in which a metal bellows type accumulator 3 is attached to a discharge pipe 2 as shown in FIG. The accumulator 3 has a bellows 6 filled with a filling gas 5 such as nitrogen gas at a high pressure, and an end plate 7 of the bellows 6 has a sealing material 8 for sealing between the bellows 6 and a bellows receiving surface 9. In addition, 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. If such a metal bellows type accumulator 3 is used, the accumulator 3 has a 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 becomes possible. When the metal bellows-type accumulator 3 is used for suppressing the pulsation of the hydraulic pressure of the discharge oil 4 of the hydraulic pump 1, the bellows 6 in which a gas 5 such as nitrogen gas is filled expands and contracts. In order to absorb the pulsation, the bellows 6 may be broken due to repeated expansion and contraction, which may cause a failure. Conventionally, the failure of this accumulator, has been detected by experience that the operator noise due to pulsation is increased. However, in the case of the bodily sensation, there is a possibility that the operation of the excavator or the like may be continued while the accumulator 3 is damaged because the sensing is uncertain and there is an individual difference. [0007] The present invention has been made in view of the above problems, the construction machine using the hydraulic pump, when using the metal bellows accumulator in suppressing the hydraulic pulsation of oil discharged from the hydraulic pump, and certainly a failure of the accumulator by the bellows damage It is an object of the present invention to provide a device that can detect immediately . According to the present invention, in a metal bellows type accumulator, a seal member is provided between a tip of the bellows and a receiving surface of the bellows, and a pressure inside the accumulator is reduced by a discharge pipe of a hydraulic pump. If the pressure is higher than
Focusing on the fact that the space between the bellows and its receiving surface is hermetically sealed by a sealing material, detecting a pressure of the accumulator, thereby detecting a failure of the accumulator due to breakage of the bellows. Accordingly, the present invention includes a pressure sensor for detecting the pressure P 1 of a metal bellows-type in the accumulator for use in the suppression of the discharge oil of the hydraulic pulsation of the hydraulic pump, detecting the pressure P 2 of the delivery line of the hydraulic pump Pressure sensor, a calculating 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 calculating means is P 1 > P 2 and P 1 > characterized by providing a fault display means for displaying a fault when a P 3. When the hydraulic pressure in the discharge line becomes high due to the operation of the actuator provided in the discharge line of the hydraulic pump, cracking of the accumulator occurs, and the bellows is compressed together with the filling gas. At this time, the pressure in the shell becomes higher than the cracking pressure. If the bellows breaks in this state, the high-pressure oil in the shell flows into the bellows, the bellows expands, and the space between the bellows and its receiving surface is sealed via a sealing material. A high pressure close to the highest pressure applied to the accumulator remains. [0011] In the case of the present invention, the high pressure remains in the accumulator pressure P 1 by bellows failure as described above,
Therefore, if it is determined by computation by the arithmetic means that the pressure P 1 is higher predetermined time than the pressure P 2 and the cracking pressure P 3 of the delivery line of the hydraulic pump in the accumulator, it is determined that a failure of the accumulator Is displayed by the fault display means. FIG. 1A illustrates the technical background of the present invention.
It is a cross-sectional view, 10 detects the internal pressure of the accumulator 3, a pressure detection indication device provided for display. The bellows end plate 7 in FIG. 1A is in a state where the hydraulic pressure P 2 of the discharge pipe line 2 of the hydraulic pump 1 is higher than the cracking pressure P 3 of the accumulator 3, and the buffer by the bellows 6 filled with the filling gas 5. This is a state where the pulsation of the hydraulic pressure is absorbed by the action. State shown by the two-dot chain line of the end plate 7, the hydraulic pressure P 2 of the discharge conduit 2 is in the state of time less than the cracking pressure P 3. The cracking pressure P 3 varies depending on the 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, for example, 350 kg / cm 2 , the gas 5
Is set to, for example, 80 to 100 kg / cm 2 , and the cracking pressure is set to, for example, about 110 to 130 kg / cm 2 . FIG. 1B is a view showing a state in which a damaged portion 11 has occurred in the bellows 6. In this case, the pressure of the sealed gas 5, that is, the pressure P detected by the pressure detection display device 10 is shown. 1 is a value close to the highest pressure among the hydraulic pressures applied to the accumulator 3 so far. FIG. 2A is a cross-sectional view showing a main part of an embodiment of the present invention , and FIG. 2B is a view showing an entire structure of the embodiment. In the present embodiment, the pressure P 1 in the accumulator 3
And pressure sensors 12 and 13 for detecting the hydraulic pressure P2 of the discharge pipeline 2 as electric signals, respectively, and are preset by a computer mounted on the hydraulic excavator or a calculating means 14 constituted by an electric circuit. From the cracking pressure P 3 and the pressures P 1 and P 2 detected by the pressure sensors 12 and 13, a failure of the accumulator 3 is detected by a comparison operation and displayed by the failure display means 15. . In the present embodiment, the case where the failure display means 15 is a lamp is shown, but the failure may be displayed by a character display or a failure number display on a display screen installed in the driver's cab. [0015] Figure 3 is a flowchart showing a flow of operation of the embodiment of FIG. 2, as will be understood from the step S1 to S6, the pressure P 1 in the accumulator 3 from the hydraulic pressure P 2 of the discharge conduit 2 high, and cracking pressure P 3 from a high state for a predetermined time (e.g. one minute) when followed lights the lamp as a fault display means 15. In this embodiment, the time measurement is high pressure P 1 in the accumulator 3, performed by the operation number N of time intervals of the comparison calculation (e.g. 20 ms), the number T (e.g., 3000 the value corresponds to a predetermined time It is determined that a failure has occurred when the number of times has reached), but another time measuring means may be used. As described above, the failure of the accumulator 3 is automatically detected by the pressure detection by the pressure sensors 12 and 13 and the pressure comparison by the calculating means 14, and when a failure occurs, the failure is displayed. Will be instantly recognized. 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 driving machines. According to the present invention , since the failure display of the accumulator is automatically performed, the operator can be more sure .
One can immediately know the failure of the accumulator.
【図面の簡単な説明】
【図１】（Ａ）は本発明の技術的背景を説明する断面
図、（Ｂ）は（Ａ）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。
【図２】（Ａ）は本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。
【図３】図２の実施例の動作の流れを示すフロー図であ
る。
【図４】従来のアキュムレータを示す断面図である。
【符号の説明】
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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 (A) is a sectional view for describing the technical background of the present invention, (B) is a sectional view showing a state when a fault occurs in the accumulator in (A). FIG. 2A is a cross-sectional view illustrating a main configuration of an embodiment of the present invention , and FIG. 2B is a diagram illustrating an entire configuration of the embodiment. FIG. 3 is a flowchart showing the operation flow of the embodiment of FIG. 2; FIG. 4 is a sectional view showing a conventional accumulator. [Description of References] 1: Hydraulic pump, 2: Discharge line, 3: Accumulator,
4: Discharge oil, 5: Filled 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: arithmetic means, 15: fault display means, 20: shell, 2
1: Pressure oil
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平１−176894（ＪＰ，Ａ) 特開 平１−145496（ＪＰ，Ａ) 特開 平５−340401（ＪＰ，Ａ) 実開 平２−14896（ＪＰ，Ｕ) 実開 昭64−15802（ＪＰ，Ｕ) 実開 平６−4402（ＪＰ，Ｕ) 実開 昭57−44201（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F16L 51/00 - 55/24 F15B 1/00 - 7/10 F15B 20/00 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-176894 (JP, A) JP-A-1-145496 (JP, A) JP-A-5-340401 (JP, A) 14896 (JP, U) Japanese Utility Model 64-15802 (JP, U) Japanese Utility Model Application Hei 6-4402 (JP, U) Japanese Utility Model Application 57-44201 (JP, U) (58) Fields surveyed (Int. 7 , DB name) F16L 51/00-55/24 F15B 1/00-7/10 F15B 20/00
Claims (1)
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＞Ｐ
３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。(57) In the construction machine using the Patent Claims: 1. A hydraulic pump, a pressure sensor for detecting the pressure P 1 of a metal bellows-type in the accumulator for use in the suppression of the hydraulic pulsation of the hydraulic pump discharge oil When a pressure sensor for detecting the hydraulic pressure P 2 of the delivery line of the hydraulic pump, a calculating means for comparing the pressure P 1, comparison and the pressure P 2 P 1 and the cracking pressure P 3 of the accumulator, the operation The calculation result by the means is P 1 > P 2 and P 1 > P
3. A failure detecting device for a metal bellows-type accumulator, further comprising failure display means for displaying a failure when the value is 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 JPH09184589A (en) | 1997-07-15 |
| JP3399731B2 true 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) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| DE10146474B4 (en) * | 2001-09-21 | 2005-10-06 | Robert Bosch Gmbh | Method and device for diagnosing a pressure damper |
| JP5168754B2 (en) * | 2005-01-20 | 2013-03-27 | 山田電機製造株式会社 | Automatic pump system and accumulator |
| KR101368830B1 (en) * | 2012-06-01 | 2014-03-03 | 삼성중공업 주식회사 | Damper |
| 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 |
-
1995
- 1995-12-28 JP JP35299695A patent/JP3399731B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09184589A (en) | 1997-07-15 |
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