KR102388775B1 - Hydraulic accumulator failure prediction diagnosis simulation system - Google Patents

Abstract

The present invention relates to a failure prediction diagnosis system for a hydraulic accumulator, and more particularly, to a hydraulic accumulator that receives the pulsating pressure of the hydraulic accumulator in real time and generates an alarm when a hazardous element occurs so that the failure of the hydraulic accumulator can be predicted. It relates to a failure prediction diagnosis simulation system.
The interior of the shell is divided into an upper shell and a lower shell by a diaphragm, the upper shell is provided with gas, the lower shell is provided with a fluid, and a hydraulic accumulator is provided inside the upper shell of the hydraulic accumulator, the oil The simulation data is transmitted through a gas pressure sensor measuring the gas pressure inside the compressor and a hydraulic accumulator simulation unit that simulates the gas pressure signal collected through the gas pressure sensor and outputs it as simulation data, and the hydraulic accumulator simulation unit A failure prediction diagnosis unit that diagnoses the risk of failure of the hydraulic accumulator by performing a failure prediction diagnosis algorithm and a data collection unit (DAQ) that outputs and collects data received through the hydraulic accumulator simulation unit or the failure prediction diagnosis unit It is possible to provide a hydraulic accumulator failure prediction diagnosis simulation system comprising a.

Description

Hydraulic accumulator failure prediction diagnosis simulation system

The present invention relates to a failure prediction diagnosis system for a hydraulic accumulator, and more particularly, to a hydraulic accumulator that receives the pulsating pressure of the hydraulic accumulator in real time and generates an alarm when a dangerous element occurs so that the failure of the hydraulic accumulator can be predicted It relates to a failure prediction diagnosis simulation system.

Large ships use extra-large engines with thousands of horsepower or hundreds of thousands of horsepower.

In this very large engine, in general, the intake valve and the exhaust valve are operated by a hydraulic cylinder in the process of performing the intake-compression-explosion-exhaust stroke.

At this time, the hydraulic accumulator for ships is mounted on the engine hydraulic cylinder unit that operates the engine fuel injection and exhaust system, and it relieves the high-pressure pressure shock and pulsation that occur during engine operation, thereby maintaining the engine system pressure constant and damping the vibration. It is a core part of a ship engine that makes the engine run smoothly.

However, marine hydraulic accumulators are operated under conditions of extreme pressure pulsation. As the stress amplitude becomes very large, the fatigue life is rapidly reduced, which leads to a failure phenomenon.

When the hydraulic accumulator for ships is damaged, the normal function of the engine becomes impossible, so the engine cylinder must be stopped and maintenance is required. Considering the current situation, structural optimization is necessary to maintain continuous durability even under conditions of extreme pressure pulsation.

In order to solve the above problems, Korean Patent Application Laid-Open No. 10-2014-0023087 discloses a technique for displaying the pressure of nitrogen gas by installing a pressure gauge in an accumulator.

However, the above-mentioned prior art is limited in that it can be properly utilized only when the engine is stopped, and furthermore, the accumulator operated by high pressure hydraulic pressure operates approximately 14,400 cycles when the engine is operated for 1 hour, In this case, a round trip voyage can be completed only after tens to hundreds of millions of cycles are normally operated. Therefore, even if the pressure of nitrogen gas is checked immediately before the ship is operated and recharged if necessary, the pressure decreases due to leakage of nitrogen gas during long-term operation of the ship. Accordingly, there is a problem that causes deterioration of engine performance.

In addition, Korean Patent Registration No. 10-1843847 monitors the pressure of nitrogen gas injected into the accumulator for the intake/exhaust valve driving device of a super-large engine to measure the nitrogen gas pressure of the accumulator, which periodically fluctuates according to the operation of the engine. The nitrogen gas pressure monitoring system of the accumulator for the intake/exhaust valve actuators of extra-large engines that can be used while the engine is running and can inform you when accurate judgment and recharging is required in a timely manner as it judges whether the compression state is appropriate according to the change in the peak-to-peak value technology has been announced.

However, as in the prior art, it simply monitors the pressure of the nitrogen gas injected into the accumulator and determines whether the nitrogen gas pressure is appropriate according to the operation of the engine, and informs whether the nitrogen gas is recharged or parts are replaced, whereas the shaft There is a problem in that it is impossible to predict whether the pressure is damaged or the failure of the accumulator in advance.

Republic of Korea Patent Publication No. 10-2014-0023087 (2014.02.26.) Republic of Korea Patent Registration No. 10-1843847 (2018.03.26.)

The present invention has been devised to solve the above problems, and an object of the present invention is to diagnose a hydraulic accumulator failure prediction to enable structural optimization so that the hydraulic accumulator can maintain continuous durability even under conditions in which extreme pressure pulsation occurs. It aims to provide a simulation system.

In addition, it is an object of the present invention to provide a hydraulic accumulator failure prediction diagnosis simulation system capable of predicting the failure time by collecting and analyzing real-time data on the extreme pressure pulsation phenomenon that causes fatigue failure of the hydraulic accumulator.

Objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those of ordinary skill in the art from the following description.

In order to achieve the above object, the hydraulic accumulator failure prediction diagnosis simulation system according to the present invention divides the inside of the shell into an upper shell and a lower shell by a diaphragm, the upper shell is provided with a gas, and the lower shell contains a fluid A hydraulic accumulator provided and a gas pressure sensor provided inside the upper shell of the hydraulic accumulator for measuring the gas pressure inside the hydraulic accumulator and a gas pressure signal collected through the gas pressure sensor are simulated to simulate data The hydraulic accumulator simulation unit outputting as or a data collection unit (DAQ) for outputting and collecting the data transmitted through the failure prediction and diagnosis unit, wherein the risk of failure diagnosed by the failure prediction and diagnosis unit is measured by the data collection unit (DAQ). It is transmitted to the simulation unit to inform the failure risk of the hydraulic accumulator.

According to a preferred embodiment, the failure prediction diagnosis unit collects and analyzes the data transmitted through the hydraulic accumulator simulation unit in real time to predict a failure occurring due to damage to the lower shell screw part of the hydraulic accumulator.

According to a preferred embodiment, the failure prediction diagnosis algorithm uses the simulation data collected through the hydraulic accumulator simulation unit according to a threshold range determined based on the gas pressure deviation, the minimum pressure, and the maximum pressure inside the hydraulic accumulator. It is characterized in that the degree of risk of failure of the compressor is determined.

According to a preferred embodiment, the hydraulic accumulator simulation unit is characterized in that it further comprises a display unit for displaying the failure risk state output through the failure prediction diagnosis unit to enable real-time monitoring.

According to a preferred embodiment, the data collection unit DAQ includes a first data collection unit DAQ that transmits the simulation data output through the hydraulic accumulator simulation unit to the failure prediction diagnosis unit and the failure prediction diagnosis unit outputted through the first data collection unit DAQ. It is characterized in that it is provided as a second data collection unit (DAQ) that transmits the risk of failure to the hydraulic accumulator simulation unit.

As described above, the hydraulic accumulator failure prediction diagnosis simulation system according to the present invention has the advantage of providing a structurally optimized hydraulic accumulator to maintain continuous durability even under conditions in which extreme pressure pulsation occurs.

In addition, the hydraulic accumulator failure prediction diagnosis simulation system according to the present invention collects and analyzes real-time data on the extreme pressure pulsation phenomenon that causes fatigue failure of the hydraulic accumulator and predicts the failure time to prevent product damage in advance and unnecessary There is an advantage in that the cost loss due to maintenance can be minimized.

1 is a perspective view and a cross-sectional view showing a hydraulic accumulator according to a preferred embodiment of the present invention.
2 is a schematic diagram showing the configuration of a hydraulic accumulator failure prediction diagnosis simulation system connected to a hydraulic accumulator according to a preferred embodiment of the present invention.
3 is a configuration diagram specifically showing the overall configuration of a hydraulic accumulator failure prediction diagnosis simulation system according to a preferred embodiment of the present invention.
4 is a flowchart illustrating a failure prediction diagnosis algorithm for determining the failure risk of a hydraulic accumulator according to a preferred embodiment of the present invention.
5 is a schematic view showing the degree of damage of the lower shell of the hydraulic accumulator according to a preferred embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them, will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only these embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention belongs It is provided to fully inform the possessor of the scope of the invention, and the present invention is only defined by the scope of the claims.

With reference to the accompanying drawings will be described in detail for the implementation of the present invention. Irrespective of the drawings, like reference numbers refer to like elements, and "and/or" includes each and every combination of one or more of the recited items.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

The terminology used herein is for the purpose of describing the embodiments, and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view and a cross-sectional view showing a hydraulic accumulator according to a preferred embodiment of the present invention, and FIG. 2 is a schematic diagram showing the configuration of a hydraulic accumulator failure prediction diagnosis simulation system connected to the hydraulic accumulator according to a preferred embodiment of the present invention. 3 is a configuration diagram specifically showing the overall configuration of the hydraulic accumulator failure prediction diagnosis simulation system according to a preferred embodiment of the present invention.

1 to 3, the hydraulic accumulator failure prediction diagnosis simulation system according to an embodiment of the present invention is largely a hydraulic accumulator 100, a hydraulic accumulator simulation unit 220, and a failure prediction diagnosis unit 240. and a data acquisition unit (DAQ) 260 .

First, the hydraulic accumulator 100 is composed of a hemispherical upper shell 120 and a lower shell 140, and the inside of the shell is divided into the upper shell 120 and the lower shell 140 by the diaphragm 130. Separately, the upper shell 120 is provided with a gas, and the lower shell 140 is provided with a fluid.

At this time, the diaphragm 130 is made of a rubber material, and by fixing and sealing the rim to the inner wall of the shell along the circumferential direction, divides the inside of the shell into upper and lower spaces, and moves up and down as if swaying according to the difference in hydraulic pressure between the upper and lower spaces. make it move

Here, the hydraulic accumulator is a marine hydraulic accumulator and is mounted on the engine hydraulic cylinder unit that operates the engine fuel injection and exhaust system, and maintains the engine system pressure constant by alleviating the high-pressure pressure shock and pulsation generated during engine operation. It is a core part of a marine engine that provides smooth engine operation by damping vibrations.

According to a preferred embodiment, the hydraulic accumulator 100 includes a gas pressure sensor 110 inside the upper shell 120 to measure the gas pressure inside the hydraulic accumulator 100 .

The gas pressure sensor 110 measures the gas pressure inside the hydraulic accumulator 100 to predict and diagnose the failure of the hydraulic accumulator 100. The gas pressure signal 4 output from the gas pressure sensor 110 ~20mA) to the hydraulic accumulator simulation unit 220 .

Next, the hydraulic accumulator simulation unit 220 simulates the gas pressure signal collected through the gas pressure sensor 110 and outputs it as simulation data.

In addition, the hydraulic accumulator simulation unit 220 further includes a display unit (not shown), so that the failure risk state output through the failure prediction and diagnosis unit 240 can be monitored in real time.

According to a preferred embodiment, the display unit (not shown) is a component for outputting an alarm signal so that an administrator can recognize the guidance corresponding to the risk of failure, and may be composed of a display or a speaker, but is not limited thereto.

Next, the failure prediction diagnosis unit 240 receives the simulation data through the hydraulic accumulator simulation unit 220 and performs a failure prediction diagnosis algorithm to diagnose and inform the failure risk of the hydraulic accumulator 100 let it be

Also, the failure prediction and diagnosis unit 240 may perform real-time monitoring and data logging of the simulation data.

Here, data logging refers to recording an event in chronological order when an event occurs, and is a basic function of a database management system to analyze data using this when an exception occurs or to return to the previous database state.

Next, the data collection unit (DAQ) 260 outputs and collects data received through the hydraulic accumulator simulation unit 220 or the failure prediction and diagnosis unit 240 .

Here, DAQ refers to data acquisition, and all actions of measuring electrical (voltage, current) and chemical (temperature, pressure, voice, etc.) signals using sensors and computers are performed, and the entire process of measuring, collecting and processing data. It is called a DAQ system.

At this time, the data collection unit (DAQ) 260 is connected to the power supply (SMPS) 250 to receive power to operate.

Here, SMPS refers to a Switching Mode Power Supply. It is a DC power supply using a switching circuit, which maximizes efficiency by increasing the switching frequency, and is characterized by being able to make a large-capacity power supply with a small size and light weight.

The data collection unit (DAQ) 260 is divided into input and output concepts, the input is in charge of collection and the output is to perform simulation and alarm output.

According to a preferred embodiment, the data collection unit (DAQ) 260 is provided with a first data collection unit (DAQ) 260-1 and a second data collection unit (DAQ) 260-2, and the 1 The data collection unit (DAQ) 260-1 transmits the simulation data of the hydraulic accumulator simulation unit 220 to the failure prediction and diagnosis unit 240, and the second data collection unit (DAQ) 260-2 ) causes the failure risk state determined by the failure prediction and diagnosis unit 240 to be transmitted back to the hydraulic accumulator simulation unit 220 .

Specifically, in the first data collection unit (DAQ) 260-1, the simulation data in the analog data format controlled by the hydraulic accumulator simulation unit 220 is output through an AO (Analog Output) module, and AI (Analog) Input) module, and the second data collection unit (DAQ) 260-2 transmits the failure risk alarm signal determined through the failure prediction and diagnosis unit 240 digitally through the DO (Digital Output) module. It is output as a signal and collects through the DI (Digital Input) module.

Therefore, the hydraulic accumulator simulation unit 220 outputs and collects analog simulation data through a first data collection unit (DAQ) 260-1, and transmits it to the failure prediction and diagnosis unit 240, and the failure The predictive diagnosis unit 240 outputs and collects the digital type of failure risk and alarm signal through the second data collection unit (DAQ) 260-2, and then transmits it to the hydraulic accumulator simulation unit 220 again. The hydraulic accumulator simulation unit 220 displays the hydraulic accumulator failure risk state through the display unit to inform the user.

4 is a flowchart illustrating a failure prediction diagnosis algorithm for determining the risk of failure of a hydraulic accumulator according to a preferred embodiment of the present invention, and FIG. It is a schematic diagram shown.

As shown in FIG. 4 , the failure prediction diagnosis unit 240 determines the failure risk of the hydraulic accumulator 100 and informs the hydraulic accumulator simulation unit 220 of the failure prediction diagnosis algorithm. make use of

According to a preferred embodiment, the failure prediction diagnosis algorithm uses the simulation data collected through the hydraulic accumulator simulation unit 220 as a threshold determined based on the gas pressure deviation, the minimum pressure, and the maximum pressure in the hydraulic accumulator 100 . According to the value range, the failure risk of the hydraulic accumulator 100 is divided into three stages to determine the state of the hydraulic accumulator as normal, dangerous, and severe.

At this time, the threshold value range was applied to the safety factor concept so that the hydraulic accumulator 100 can stably maintain the engine operating system pressure of 300 bar, and the range was set based on the accumulated experimental data, but the user It is ok even if the value range can be adjusted.

The cause of the failure of the hydraulic accumulator 100 for determining the risk of failure of the hydraulic accumulator 100 can be divided into a technical factor and a human factor. There is damage that occurs when the shock is not properly absorbed due to fatigue damage of the screw or nitrogen gas leakage. When a leak occurs, if the crew periodically measures the nitrogen pressure or if the charge management part using the supply device is insufficient, the performance of the hydraulic accumulator 100 is deteriorated and a malfunction may occur.

In this way, the failure prediction diagnosis unit 240 determines the state of the hydraulic accumulator 100 as normal in normal times, but predicts the failure according to the type of failure occurring due to the failure cause of the hydraulic accumulator 100 . By applying a diagnostic algorithm, the failure risk is determined in three stages: normal, critical, and severe.

In an embodiment, the type of failure occurring due to the cause of the failure of the hydraulic accumulator 100 is a case in which an abnormal pressure amplitude is continuously detected in the normal hydraulic accumulator, and the risk is the lower shell screw of the hydraulic accumulator. It refers to a case in which damage has occurred, and the above severity refers to a case in which damage to the lower shell screw part of the hydraulic accumulator is propagated.

Specifically, as shown in FIG. 5, (a) shows the damage to the lower shell screw part of the hydraulic accumulator, which is in a dangerous state among the risk of failure, (b) is a state that is in a serious state among the risk of failure (a) ) shows the propagation of the damage.

As such, the risk and severity of the failure risk state refers to a case in which the hydraulic accumulator 100, the lower shell 120, and the failure occurs due to the failure of the shock absorption due to the occurrence of nitrogen gas leakage as the fatigue damage proceeds. , it is also possible to predict and prevent a failure due to damage to the screw portion of the lower shell 120 of the hydraulic accumulator 100 through the failure prediction and diagnosis algorithm in advance.

In addition, as shown in FIG. 4 , the failure prediction diagnosis algorithm determines the failure risk state of the hydraulic accumulator 100, and the gas pressure deviation, minimum pressure, and maximum pressure range for each failure risk state. is set to be different, and the value measured by the gas pressure sensor 110 of the hydraulic accumulator 100 is compared with a predetermined threshold value range to determine the failure risk state.

Specifically, the normal refers to a stable state with a normal pressure amplitude of 75 bar, and the normal refers to a case in which an extreme pressure amplitude pattern of 150 bar or more, which is twice the normal pressure amplitude of 75 bar, occurs, and the risk is an extreme pressure amplitude of 150 bar The above is applied in a certain pattern and refers to the generation of pressure amplitude at the point in time when damage to the lower shell 140 of the hydraulic accumulator 100 is started, and the severity is the damage to the lower shell 140 of the hydraulic accumulator 100. It refers to the generation of pressure amplitude at the time of growth.

More specifically, the normal alarm scenario (S10) is the simulation data collected through the hydraulic accumulator simulation unit 220, the pressure deviation of the nitrogen gas charged in the hydraulic accumulator 100, the minimum pressure , based on the highest pressure, the pressure deviation is a value between 70 bar or more and less than 80 bar, the lowest pressure is a value between 220 bar or more and less than 225 bar, and the highest pressure is a value between 295 bar or more and less than 300 bar. When the simulation data transmitted through the hydraulic accumulator simulation unit 220 falls within the above range, the failure risk is determined to be normal.

The normal alarm scenario (S20) is based on the simulation data collected through the hydraulic accumulator simulation unit 220, the pressure deviation, the minimum pressure, and the maximum pressure of the nitrogen gas charged in the hydraulic accumulator 100. The pressure deviation is a value between 80 bar or more and less than 150 bar, the minimum pressure is a value between 165 bar or more and less than 220 bar, and the maximum pressure is a value between 300 bar or more and less than 315 bar. The hydraulic accumulator simulation unit If the simulation data transmitted through 220 falls within the above range, the failure risk is determined to be level 1, normal.

The risk alarm scenario (S30) is based on the simulation data collected through the hydraulic accumulator simulation unit 220, the pressure deviation, the minimum pressure, and the maximum pressure of the nitrogen gas charged in the hydraulic accumulator 100. By setting, the pressure deviation is a value between 150 bar or more and less than 160 bar, the minimum pressure is a value between 160 bar or more and less than 165 bar, and the maximum pressure is a value between 315 bar or more and less than 320 bar. When the simulation data transmitted through the simulation unit 220 falls within the above range, the failure risk is determined as a second-stage risk.

The serious alarm scenario (S40) is based on the simulation data collected through the hydraulic accumulator simulation unit 220, the pressure deviation, the minimum pressure, and the maximum pressure of the nitrogen gas charged in the hydraulic accumulator 100. By setting, the pressure deviation is a value between 160 bar or more and less than 170 bar, the minimum pressure is a value between 155 bar or more and less than 160 bar, and the highest pressure is a value between 320 bar or more and less than 325 bar. When the simulation data transmitted through the simulation unit 220 falls within the above range, the failure risk is determined to be three-level serious.

Accordingly, the state of the hydraulic accumulator 100 is normally displayed through the display unit of the hydraulic accumulator simulation unit 220, but an alarm output according to the failure prediction diagnosis algorithm of the failure prediction and diagnosis unit 240 Monitoring in real time by judging the failure risk of the hydraulic accumulator 100 as normal (step 1), dangerous (step 2), and severe (step 3) through a signal and displaying the failure risk status of the hydraulic accumulator 100 By making it possible, an alarm is generated when a risk factor such as nitrogen gas leakage or damage to the hydraulic accumulator occurs due to abnormal extreme pressure pulsation, so that the crew member fills the hydraulic accumulator 100 with nitrogen, replaces the consumable diaphragm, etc. The hydraulic accumulator ( 100) by predicting the failure of the hydraulic accumulator in advance and providing an environment for maintenance before failure occurs, enabling the optimization of the hydraulic accumulator to maintain continuous durability even under conditions of extreme pressure pulsation.

Although embodiments of the present invention have been described with reference to the above and the accompanying drawings, those of ordinary skill in the art to which the present invention pertains can practice the present invention in other specific forms without changing its technical spirit or essential features. You will understand that there is Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

100: hydraulic accumulator
110: gas pressure sensor
120: upper shell
130: diaphragm
140: lower shell
200: hydraulic accumulator failure prediction diagnosis system
220: hydraulic accumulator simulation unit
240: failure prediction diagnosis unit
250: power supply
260: data acquisition unit (DAQ)
260-1: first data acquisition unit (DAQ)
260-2: second data acquisition unit (DAQ)

Claims (5)

a hydraulic accumulator in which a gas is provided in the upper shell and a fluid is provided in the lower shell by dividing the inside of the shell into an upper shell and a lower shell by a diaphragm;
a gas pressure sensor provided inside the upper shell of the hydraulic accumulator and measuring a gas pressure inside the hydraulic accumulator;
a hydraulic accumulator simulation unit for simulating the gas pressure signal collected through the gas pressure sensor and outputting it as simulation data;
a failure prediction diagnosis unit that receives the simulation data through the hydraulic accumulator simulation unit, and performs a failure prediction diagnosis algorithm to diagnose the risk of failure of the hydraulic accumulator;
A data collection unit (DAQ) for outputting and collecting data received through the hydraulic accumulator simulation unit or the failure prediction diagnosis unit;
A hydraulic accumulator failure prediction diagnosis simulation system that transmits the failure risk diagnosed by the failure prediction diagnosis unit to the hydraulic accumulator simulation unit through the data collection unit (DAQ) to inform the failure risk of the hydraulic accumulator.
The method of claim 1,
The failure prediction and diagnosis unit,
The hydraulic accumulator failure prediction diagnosis simulation system, characterized in that it collects and analyzes data received through the hydraulic accumulator simulation unit in real time to predict a failure caused by damage to the lower shell screw part of the hydraulic accumulator.
The method of claim 1,
The failure prediction and diagnosis algorithm is
Determining the risk of failure of the hydraulic accumulator according to a threshold range determined based on the gas pressure deviation, the minimum pressure, and the maximum pressure inside the hydraulic accumulator based on the simulation data collected through the hydraulic accumulator simulation unit Hydraulic accumulator failure prediction diagnosis simulation system.
The method of claim 1,
The hydraulic accumulator simulation unit,
The hydraulic accumulator failure prediction diagnosis simulation system, characterized in that it further comprises a display unit for displaying the failure risk state output through the failure prediction diagnosis unit to enable real-time monitoring.
The method of claim 1,
The data acquisition unit (DAQ).
a first data collection unit (DAQ) that transmits the simulation data output through the hydraulic accumulator simulation unit to the failure prediction and diagnosis unit;
The hydraulic accumulator failure prediction diagnosis simulation system, characterized in that it is provided with a second data collection unit (DAQ) that transmits the failure risk level output through the failure prediction and diagnosis unit to the hydraulic accumulator simulation unit.

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