A method for intelligent analysis of oil pressure device operation data based on PLC

Abstract

The present invention relates to the field of hydropower station data management, and its purpose is to provide a method and system for intelligent analysis of oil pressure device operating data based on PLC, so as to address the shortcomings of manual analysis of oil pressure device operating data. The implementation method is as follows: the production and operation process of the oil pressure device is divided into a pump start state, a pump operation state, and a pump stop state, and the characteristics of each state are analyzed and evaluated separately to form a functional analysis of the entire production and operation process of the oil pressure device. The equipment operating data involved in each process is then analyzed in terms of action value, change rate, operating cycle, etc., to form a comprehensive component status analysis of the oil pressure device. Thus, a full-process and comprehensive analysis and evaluation system is formed at the system level and component level.

Description

Technical Field

[0001] The present invention relates to the technical field of oil pressure device data analysis, and in particular to a method for intelligent analysis of oil pressure device operation data based on PLC. Background Art

[0002] A hydropower station has six 600MW turbine generators. The cylinder valve oil pressure device requires manual data extraction and analysis every month. This analysis includes information such as the oil pump start-up interval, air supply valve air supply time, and oil pump operation time. Due to objective factors such as insufficient manual periodic data extraction and lengthy manual calculation times, the current status and changing trends of the equipment cannot be determined in a timely manner. This inability to conduct real-time analysis and judgment results in a delay in identifying equipment hazards.

[0003] Current data analysis and early warning capabilities for hydraulic systems are fragmented and incomplete, lacking a systematic, comprehensive, and comprehensive data analysis and early warning capability. When equipment experiences issues like aging, degradation, or leaks, manual inspections and data analysis can't identify them early, impacting the reliable operation of the hydraulic system.

[0004] In order to solve the problems of manual calculation to judge the equipment status and change trends, reduce manual calculation time, discover and judge the equipment operation status in advance, and improve the equipment operation reliability, it is necessary to use the PLC control system and the various signals sent up, and conduct targeted research on the method of intelligent analysis of the oil pressure device operation data based on PLC. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the existing technology, separate the different processes of the production operation of the oil pressure device, and then conduct a comprehensive analysis of the action value, change rate, operation cycle and other data of the equipment operation data involved in each process, and establish a full-process and full-dimensional operation data intelligent analysis and early warning method.

[0006] Specifically, the method is implemented by the following technical solution: A method for intelligent analysis of oil pressure device operation data based on PLC, comprising the following steps:

[0007] Step S1: Before the oil pump is started, the measurement link is processed. The measurement link determines whether the switch action drifts and whether the measured values ​​of the oil level transmitter of the oil return tank and the oil pressure tank and the pressure transmitter jump through the action values ​​of the pressure switch and the oil level switch of the oil return tank and the oil pressure tank;

[0008] Step S2: When the oil pump or the air supply valve is working, the execution link is processed, and the execution link includes analysis of the oil pump startup time, the oil pump pressure build-up rate, and the air supply rate of the air supply valve;

[0009] Step S3: After the oil pump stops, the system is processed. This includes analyzing the oil consumption of the oil circuit system, which is composed of the hydraulic device and the target it supplies (e.g., the cylinder valve system of a hydropower station's turbine). This system analysis also requires determining the state of the supply target (e.g., the opening, closing, and stop state of the cylinder valve system of a hydropower station's turbine) based on the characteristics of the supply target, using the hydraulic device program to accurately analyze the oil consumption rate based on the different states of the supply target.

[0010] Step S4: Obtain the evaluation value of the oil pressure device during production and operation through the measurement link, execution link and system link.

[0011] Preferably, in the step S1, the analog quantity and the switch quantity working value are compared to determine whether the switch quantity is performing work and reset, and the step also includes statistics on analog quantity jumps, statistics on the number of jumps, jump values ​​and maximum jump values ​​of the oil tank pressure and oil level, and evaluation of the performance of the analog quantity transmitter.

[0012] Preferably, in the execution link, the starting circuit and component performance are analyzed by the oil pump starting time, the oil pump supply performance is analyzed by the oil pump pressure building rate, and the air supply device performance is analyzed by the air supply rate of the air supply valve. The high pressure warning unit is used to monitor the real-time value of the pressure analog quantity.

[0013] Preferably, the evaluation value includes a calculation function of a full score and a weight, and the measurement link, execution link, and system link correspond to weights of 0.2, 0.4, and 0.4, respectively, and the same full score. The operating conditions of each device in each link are used to score, and the evaluation value of the hydraulic device in each production operation process is obtained and a two-dimensional curve of time-score is recorded.

[0014] A PLC-based intelligent analysis system for oil pressure device operation data, the system includes measurement link, execution link and system operation link,

[0015] The measurement link includes a switch action value analysis unit, a switch analog comparison unit and an analog jump analysis unit; the execution link includes an oil pump start-up time analysis unit and an oil pump pressure building rate analysis unit, the pump start-up state response analysis unit includes an oil pump start-up time analysis unit, the pump operation state efficiency analysis unit includes an oil pump pressure building rate analysis unit, an air supply valve air supply rate analysis unit and an over-pressure early warning unit, and the system operation link also includes an oil level drop rate analysis unit, a pump start-up interval analysis unit, an air supply time statistical analysis unit and an oil-gas ratio incoordination early warning unit.

[0016] Preferably, the switch value and analog value comparison unit determines the consistency between the switch value and the analog value, and the analog value jump analysis unit determines the abnormality of the analog value signal by recording the jump value and jump number of the analog value in a time period.

[0017] Preferably, the oil pump start-up time analysis unit records the time between the issuance of the oil pump start-up instruction and the arrival of the oil pump operation signal, records and calculates the average value multiple times, compares the average value with the standard time length, and determines the abnormal time period. The air supply valve air supply rate analysis unit records the difference between the pressure value when the oil pump starts and the pressure value when the oil pump stops, and divides it by the working time of the oil pump to obtain the oil pump pressure building rate. By comparing the calculated pressure building rate with the standard pressure building rate, the abnormal oil pump pressure building value is locked, and the high pressure early warning unit obtains the analog pressure value and compares it with the standard analog pressure value to determine whether to trigger the warning.

[0018] Preferably, the time interval of each auxiliary pump start-up is obtained through the pump start-up interval analysis unit and the average is calculated, the average is compared with the start-up time standard value, the abnormal time interval segment is locked, the oil level drop rate per hour when the cylinder valve is not actuated, the oil pump is not actuated, and the air supply valve is not actuated is recorded through the oil level drop rate analysis unit and the average is calculated, the average is compared with the standard drop value, the abnormal oil level drop rate is locked, the pressure oil tank pressure is monitored through the pressure abnormal rise early warning unit, and it is judged whether the air supply valve closure is normal, the oil-gas ratio of the pressure oil tank is monitored through the oil-gas ratio uncoordinated early warning unit, the air supply time of the air supply valve each month is counted through the air supply time statistical analysis unit, and the air supply time for the next time period is planned according to the gas consumption.

[0019] Preferably, the system further comprises a display unit, and the threshold of each unit is controlled and the data of each unit is exported by interacting with the display unit.

[0020] The beneficial effects of the present invention are:

[0021] (1) It can intuitively and effectively conduct all-round intelligent data analysis of the entire process of the hydraulic device, and comprehensively cover all parameters of the oil pump operation;

[0022] (2) Monitor the entire operation cycle of the oil pump to ensure that the parameters at each time node can be captured. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a block diagram of the overall system of the present invention. DETAILED DESCRIPTION

[0024] Below with reference to the appended claims of the present invention Figure 1 The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of this application.

[0025] Example 1:

[0026] Without changing the hydraulic device PLC control system hardware or adding a new external analysis device, the new intelligent analysis function can be implemented through programming based on the existing PLC control system's controller, sensor and other hardware and the existing computing power of the PLC.

[0027] The entire production process of a hydraulic device is divided into the following stages: pump start, pump operation, and pump stop. During the pump start state, the response of the pump's start-up control is analyzed. During the pump operation state, the pump's operating efficiency is analyzed. During the pump stop state, the oil usage rate of the hydraulic device is analyzed. This results in a functional analysis of the entire hydraulic device production process.

[0028] The operating data of the components involved in the three states of the oil pump, including the oil pump, air supply device, oil pressure transmitter, oil level transmitter, pressure switch, oil level switch, etc., are analyzed. The operating data analysis should cover all components in the system to form a comprehensive component status analysis of the oil pressure device.

[0029] Comprehensive component status analysis is divided into three areas. For the measurement phase, analysis is performed on switch action values, switch analog comparisons, and analog jumps. For the execution phase, response and efficiency analysis is performed, including oil pump startup time, oil pump pressure build-up rate, air supply valve air supply rate, and high pressure early warning. At the system level, analysis is performed on oil (leakage) and gas usage, including oil level drop rate, pump startup interval, air supply time statistics, and oil-to-gas ratio mismatch warnings.

[0030] It forms a full-process analysis of the oil pump's operating status and a full-dimensional analysis of the component-level analysis, thereby forming a full-process and full-dimensional operating data intelligent analysis system.

[0031] Specific implementation method of the analysis function:

[0032] Measurement process:

[0033] (1) Analysis of switch action values: Statistical analysis of the action values ​​of the pressure switches and oil level switches of the return oil tank and the pressure oil tank to reflect whether the switch action values ​​drift.

[0034] (2) Comparison of switch quantity and analog quantity: By comparing the analog quantity with the switch quantity action value, it is reflected whether the switch quantity can operate and reset reliably, so as to judge whether the switch is working normally.

[0035] (3) Analog jump statistics: Statistical analysis of the number of jumps, jump values ​​and maximum jump values ​​of the oil tank pressure and oil level each month to reflect the working conditions and performance change trends of the analog transmitter.

[0036] Execution stage:

[0037] (1) Oil pump start-up time analysis: Statistical analysis of the time from the issuance of the oil pump start command to the return of the oil pump operation signal, reflecting the performance of the start-up circuit and components.

[0038] (2) Analysis of oil pump pressure build-up rate: Statistical analysis of the pressure build-up rate after the oil pump is started when the cylinder valve is stationary, reflecting the oil supply performance of the oil pump.

[0039] (3) Analysis of the air supply rate of the air supply valve: Statistical analysis of the air supply rate of the air supply valve when the cylinder valve is stationary and the oil pump is not in operation, reflecting the performance of the air supply device.

[0040] (4) Early warning of excessive pressure: When the oil tank pressure analog value has no faults and the real-time value of the pressure analog value is greater than the oil tank pressure excessive warning judgment value, an early warning of excessive oil tank pressure is issued to remind the operating personnel to intervene in the equipment abnormality in advance to prevent equipment accidents.

[0041] System level:

[0042] (1) Pump start interval analysis: Statistical analysis of the auxiliary pump start time interval when the cylinder valve is stationary, which mainly indirectly reflects the internal leakage condition when the cylinder valve is stationary.

[0043] (2) Analysis of oil level drop rate: Statistical analysis of the oil level drop rate in the pressure oil tank when the cylinder valve is stationary and the oil pump is not operating, reflecting the internal leakage condition when the cylinder valve is stationary.

[0044] (3) Warning of abnormal pressure rise: When the oil pump and the air supply valve are not in operation and the pressure is greater than 6.32 MPa (the oil pump stop pressure is 6.30 MPa, considering the normal error and margin of the pressure analog measurement value), if the monitored pressure rises abnormally, a warning of abnormal pressure rise in the oil tank will be issued to remind the operating personnel to intervene in the equipment abnormality in advance to prevent equipment accidents.

[0045] (4) Oil-gas ratio imbalance warning: When the oil pump and the air supply valve are not in operation, the oil level is greater than the pump stop oil level and the pressure is less than the auxiliary pump starting pressure, or the oil level is less than the pump start oil level and the pressure is greater than the pump stop pressure, an oil-gas ratio imbalance warning is issued in the oil pressure tank to remind the operating personnel to intervene in the equipment abnormality in advance to ensure that the equipment operates in the best condition.

[0046] (5) Analysis of the total time of air replenishment per month: Statistical analysis of the total time of air replenishment by the air replenishment valve per month, reflecting the monthly air replenishment volume (gas consumption, whether there is air leakage).

[0047] This embodiment uses a specific unit as the test subject. Currently, this intelligent analysis function has been implemented in six units of the power station. After implementation, the function was verified to be correct, the effect was good, and the expected effect was achieved. The various data statistics and alarm functions can comprehensively analyze equipment problems. After implementation, the problem of the auxiliary pump start-stop interval becoming shorter and the oil level drop rate becoming faster was analyzed in advance. The final cause was found to be leakage in the digital cylinder of the cylinder valve; the air supply time of the air supply valve became longer in advance. The final cause was found to be the lax closure of the internal check valve of the air supply valve. In summary, it can be confirmed that this method is actually effective and can intuitively and effectively perform comprehensive data intelligent analysis of the entire process of the oil pressure device. Switch action value analysis: record the five groups of historical action values ​​of all switch quantities. For example, the auxiliary pump pressure setting is 6.1MPa. Record the values ​​of the pressure analog quantity during the last five switch actions and compare them with the set value of 6.1MPa. Record the maximum deviation value. If the maximum deviation exceeds 0.06MPa, it indicates that the pressure switch needs to be adjusted.

[0048] Comparison between switch quantity and analog quantity: By comparing the analog quantity with the switch quantity, it is used to assist in judging whether the switch quantity signal is normal. For example, if the analog quantity of the return tank oil level is greater than the super-high oil level set value (850mm) plus the judgment value (30mm) of the inconsistency between the switch quantity and the analog quantity of the return tank oil level, that is, the analog quantity of the return tank oil level is greater than 880mm, if the switch quantity signal of the return tank super-high oil level has not arrived, or the switch quantity signal of the return tank super-high oil level has not been restored and the analog quantity oil level is less than 820mm (850mm-30mm), the alarm of the inconsistency between the switch quantity and the analog quantity of the return tank oil level will be reported after a delay of 10s, indicating that the switch quantity signal is abnormal.

[0049] Analog jump statistics: continuously record the jump value and jump frequency of the analog quantity every month. For example, if the pressure of the oil tank jumps, the jump pressure value at that time is recorded and the jump frequency is accumulated. It can continuously monitor whether the jump occurs to determine whether the analog signal is abnormal.

[0050] Oil pump start-up time analysis: continuously record the time between the issuance of the oil pump start-up command and the arrival of the oil pump operation signal, record the last five start-up times and calculate the average time. If the five sets of auxiliary pump start-up time data are 0.2s, 0.3s, 0.2s, 0.3s, and 0.2s, the average time is 0.24s. When the start-up time is greater than 0.36s (that is, greater than 150% of the average value, the comparison value defaults to 150% of the average value (considering that the measured value has a certain volatility), it is beneficial for the initial use of the system when there is no reasonable and available value data. At the same time, the value can also be directly entered in the human-machine display interface for more accurate monitoring and evaluation. Note: The selection principle of the average value later in the text is consistent with this), an alarm will be issued and the current abnormal time will be locked and recorded until it is manually restored.

[0051] Analysis of the oil pump and air supply valve pressure buildup rate: Continuously record the pressure buildup rate of the oil pump and air supply valve. Record the last five rates and calculate the average rate. For example, if the pressure is 6.1 MPa when the oil pump starts and 6.3 MPa when it stops, and the oil pump runs for 0.5 hours, the oil pump pressure buildup rate is 0.4 MPa / h. If the oil pump pressure buildup rate for the last five times was 0.4 MPa / h, 0.5 MPa / h, 0.4 MPa / h, 0.5 MPa / h, and 0.4 MPa / h, the average oil pump pressure buildup rate is 0.44 MPa / h. If the oil pump pressure buildup rate is less than 0.22 MPa / h (i.e., less than 50% of the average), an alarm is triggered and the abnormal oil pump pressure buildup rate is locked and recorded until it is manually reset.

[0052] Early warning of excessive pressure: When the analog pressure value is greater than the oil tank pressure excessive warning judgment value of 6.4MPa, an alarm will be issued to remind staff to take timely measures in advance to avoid reaching an excessive pressure of 6.6MPa. The purpose is to prevent the oil pump, air valve and other pressure-providing equipment from getting out of control.

[0053] Oil pump start interval analysis: continuously record the interval time of each auxiliary pump start, record the interval time of the last five times and calculate the average time. If the auxiliary pump start intervals for the last five times are 200min, 220min, 240min, 220min, and 240min, the average start time is 224min. If the start time is less than 168min (i.e. less than 75% of the average value), an alarm will be issued and the current abnormal time interval will be locked and recorded until it is manually restored.

[0054] Oil level drop rate analysis: Continuously record the hourly oil level drop rate when the cylinder valve, oil pump, and air supply valve are not actuated. Record the last five sets of drop rates and calculate the average. If the oil level drop rate for the last five times is 6mm / h, 5mm / h, 6mm / h, 6mm / h, and 5mm / h, the average drop rate is 5.6mm / h. If the oil level drop rate is greater than 8.4mm / h (i.e., greater than 150% of the average), an alarm will be triggered and the record of the current abnormal oil level drop rate will be locked until it is manually reset. The oil level drop rate and the oil pump start-up interval together constitute the analysis of the system's oil consumption rate. The oil pump start-up interval reflects the oil supply to the oil system, which is composed of the oil pressure device and the oil supply object of the oil pressure device, while the oil level drop rate reflects the oil consumption of the oil system. The two are basically equal and can be verified with each other.

[0055] Abnormal Pressure Rise Warning: If all three pumps are not running and the air supply valve is not open, and the oil tank pressure is greater than 6.22 MPa, and if the pressure after a 90-second delay is 0.1 MPa greater than the pressure after a 60-second delay, and the pressure is greater than 6.32 MPa, the oil tank pressure will be reported as abnormally rising, indicating equipment abnormalities such as a lax air supply closure. The high pressure early warning and abnormal pressure rise warning functions are based on pressure warnings for both the oil pump and air supply states, and those for when they are not, providing monitoring for abnormally high pressure in all operating conditions.

[0056] Oil-gas ratio imbalance warning: If all three pumps are not running, the air supply valve is not opened, and the oil tank pressure is less than 6.1MPa (oil pressure judgment value 1 for oil-gas ratio imbalance in oil tank), the magnetic flap oil level is greater than 1250mm (oil pressure judgment value 1 for oil-gas ratio imbalance in oil tank), or the oil tank pressure is less than 6.2MPa (oil pressure judgment value 2 for oil-gas ratio imbalance in oil tank), the magnetic flap oil level is greater than 1050mm (oil pressure judgment value 2 for oil-gas ratio imbalance in oil tank), an alarm will be issued for oil-gas ratio imbalance in oil tank.

[0057] Monthly Total Air Replenishment Time Analysis: This function continuously records the monthly air replenishment time of the air replenishment valve. This function accumulates the time when the air replenishment valve is operating and stops when the valve stops. The time continues the next time the valve is operated, and the time is refreshed the next month. The total monthly air replenishment time is recorded for the past five months to determine monthly air usage. The oil-to-gas ratio imbalance warning and monthly total air replenishment time analysis together constitute an analysis of the compressed air volume in the oil tank. A normal oil-to-gas ratio and increased total air replenishment time indicate increased air usage and a leak in the oil tank. An abnormal oil-to-gas ratio indicates excessive or insufficient air replenishment.

[0058] The comparison and judgment method of each sub-function is to compare with the average value in the initial stage. With the long-term operation of the intelligent analysis function, when the amount of data is large, the data of each sub-function of the intelligent analysis during the normal operation of each unit can be obtained. At this time, a reasonable set value can be selected based on this, and compared with the set value (set the set value setting window and comparison method switching button on the touch screen). After selecting a reasonable set value and switching to the comparison method with the set value, the intelligent analysis function is more accurate.

Claims

1. A method for intelligent analysis of oil pressure device operation data based on PLC, characterized in that: The following steps are involved: Step S1: Before the oil pump is started, the measurement link is processed. The measurement link determines whether the switch action drifts and whether the measured values ​​of the oil level transmitter of the oil return tank and the oil pressure tank and the pressure transmitter jump through the action values ​​of the pressure switch and the oil level switch of the oil return tank and the oil pressure tank; Step S2: When the oil pump or the air supply valve is working, the execution link is processed, and the execution link includes analysis of the oil pump startup time, the oil pump pressure build-up rate, and the air supply rate of the air supply valve; Step S3: After the oil pump stops, the system process is performed. The system process includes oil consumption analysis of the oil circuit system composed of the oil pressure device and the oil supply object of the oil pressure device. The system process analysis also requires judging the state of the oil supply object based on the characteristics of the oil supply object through the oil pressure device program, and analyzing the oil consumption rate according to the different states of the oil supply object; Step S4: obtaining an evaluation value of the oil pressure device during production and operation through the measurement link, execution link, and system link; After the oil pump stops, the system links include analyzing the pump start interval time and the oil level drop rate to determine the internal drainage value of the oil circuit system composed of the oil pressure device and the oil pressure device oil supply object, the air replenishment time and the oil-gas ratio of the oil pressure tank to warn whether the oil pressure tank is leaking or the air replenishment is abnormal.

2. The method for intelligent analysis of oil pressure device operation data based on PLC according to claim 1 is characterized in that: In the step S1, the analog quantity and the switch quantity working value are compared to determine whether the switch quantity is working and resetting. The step also includes statistics on analog quantity jumps, statistics on the number of jumps, jump values ​​and maximum jump values ​​of the oil tank pressure, oil level and return tank oil level, and evaluation of the performance of the analog quantity transmitter.

3. The method for intelligent analysis of oil pressure device operation data based on PLC according to claim 2 is characterized in that: In the execution link, the starting circuit and component performance are analyzed through the oil pump starting time, the oil pump supply performance is analyzed through the oil pump pressure building rate, and the air supply device performance is analyzed through the air supply rate of the air supply valve. The high pressure warning unit is used to monitor whether the real-time value of the system pressure analog quantity exceeds the pressure limit due to some abnormality.

4. The method for intelligent analysis of oil pressure device operation data based on PLC according to claim 1, characterized in that: The evaluation value includes a calculation function with a full score and a weight. The measurement link, execution link, and system link correspond to weights of 0.2, 0.4, and 0.4, respectively, and the same full score. The operating conditions of each device in each link are used to score the evaluation value of the hydraulic device in each production operation process, and a two-dimensional time-score curve is recorded.

5. A PLC-based intelligent analysis system for oil pressure device operation data, characterized in that: The method for intelligent analysis of operating data of an oil pressure device based on PLC according to any one of claims 1 to 4 is applied, wherein the system includes a measurement link, an execution link and a system operation link. The measurement link includes a switch action value analysis unit, a switch analog comparison unit and an analog jump analysis unit; the execution link includes an oil pump start-up time analysis unit and an oil pump pressure building rate analysis unit, the pump start-up state response analysis unit includes an oil pump start-up time analysis unit, the pump operation state efficiency analysis unit includes an oil pump pressure building rate analysis unit, an air supply valve air supply rate analysis unit and an over-pressure early warning unit, and the system operation link also includes an oil level drop rate analysis unit, a pump start-up interval analysis unit, an air supply time statistical analysis unit and an oil-gas ratio incoordination early warning unit.

6. The PLC-based intelligent analysis system for oil pressure device operation data according to claim 5 is characterized in that: The switch value analog value comparison unit determines the consistency between the switch value and the analog value. The analog value jump analysis unit determines the abnormality of the analog value signal by recording the jump value and jump number of the analog value in a time period.

7. The PLC-based intelligent analysis system for oil pressure device operation data according to claim 5 is characterized in that: The oil pump start-up time analysis unit records the time between the issuance of the oil pump start-up command and the arrival of the oil pump operation signal, records and calculates the average value through multiple times, compares the average value with the standard time length, and determines the abnormal time period. The air supply valve air supply rate analysis unit records the difference between the pressure value when the oil pump starts and the pressure value when the oil pump stops, and divides it by the working time of the oil pump to obtain the oil pump pressure building rate. By comparing the calculated pressure building rate with the standard pressure building rate, the abnormal oil pump pressure building value is locked. The analog pressure value is obtained by the high pressure early warning unit and compared with the standard analog pressure value to determine whether the warning is triggered.

8. The PLC-based intelligent analysis system for oil pressure device operation data according to claim 6 is characterized in that: The pump start interval analysis unit is used to obtain the time interval for each start of the auxiliary pump and calculate the average value. The average value is compared with the standard value of the start time to lock the abnormal time interval segment. The oil level drop rate analysis unit records the hourly oil level drop rate when the cylinder valve is not actuated, the oil pump is not actuated, and the air supply valve is not actuated and calculates the average value. The average value is compared with the standard drop value to lock the abnormal oil level drop rate. The abnormal pressure rise warning unit is used to monitor the pressure oil tank pressure to determine whether the air supply valve closure is normal. The oil-gas ratio uncoordinated warning unit is used to monitor the oil-gas ratio of the pressure oil tank. The air supply time of the air supply valve each month is counted by the air supply time statistical analysis unit, and the air supply time for the next time period is planned based on the gas consumption.

9. The PLC-based intelligent analysis system for oil pressure device operation data according to claim 7 is characterized in that: The system also includes a display unit, which is used to control the threshold of each unit and export the data of each unit by interacting with the display unit.

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