A hydraulic control system and method based on gas-liquid linkage

Abstract

The present application relates to the technical field of hydraulic system, especially to a kind of hydraulic control system and method based on gas-liquid linkage, wherein the system includes: gas-liquid linkage module, detection module, data transmission module, aging evaluation module, and analysis module, wherein: aging evaluation module is used to calculate aging score, and the corresponding standard resistance value interval when valve is opened or closed is divided into several standard subintervals according to aging score;Analysis module is used to train valve resistance model, obtain standard resistance curve, compare standard resistance curve with standard subinterval and determine whether standard resistance curve is accurate, if accurate, obtain abnormal resistance curve and determine whether valve operation meets preset standard according to abnormal resistance curve, if meet, correct hydraulic pressure. Gas pressure is stored by gas storage tank, so as to drive valve, solve the problem of energy acquisition difficulty around gas pipeline in actual life, reduce the deployment cost of supporting facilities after pipeline laying.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and in particular to a hydraulic control system and method based on pneumatic-hydraulic linkage. Background Technology

[0002] In the process of gas pipeline transportation, valves, as core equipment controlling the opening and closing of pipelines, are directly related to the safety of the gas transmission pipeline due to their operational stability. Currently, most pipeline valves are driven by a pneumatic-hydraulic linkage control system.

[0003] However, in the use of existing pneumatic-hydraulic linkage hydraulic control systems, the resistance of valves gradually increases during the opening and closing process due to factors such as aging, deposit accumulation, and corrosion. Existing technologies rely on fixed air pressure, hydraulic pressure, or resistance thresholds to determine the operating status, making it difficult to distinguish between the increase in resistance caused by natural aging of the valve and the increase in resistance caused by deposit accumulation and corrosion. This leads to inaccurate determination of the valve status, which can easily cause misjudgment or omission, resulting in sluggish valve operation or increased maintenance costs.

[0004] Therefore, the existing technology has defects and urgently needs improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic control system and method based on pneumatic-hydraulic linkage to solve the problems in the prior art that rely on fixed air pressure, hydraulic pressure or resistance thresholds to determine the operating status, making it difficult to distinguish between the increase in resistance caused by the natural aging of valves and the increase in resistance caused by the accumulation of deposits and corrosion. This leads to inaccurate determination of the valve status, which can easily cause misjudgment or omission, resulting in sluggish valve operation or increased maintenance costs.

[0006] This invention provides a hydraulic control system based on pneumatic-hydraulic linkage, comprising:

[0007] The gas-liquid linkage module is used to control the opening or closing of valves by using the gas pressure in the pipeline as a power source.

[0008] The detection module is used to detect the operating parameters of the hydraulic control system during operation and generate historical data.

[0009] The data transmission module is used to transmit the historical data;

[0010] The aging assessment module is used to calculate the aging score based on the historical data, divide the standard resistance value range corresponding to the valve opening or closing into several standard sub-ranges based on the aging score, calculate the current aging score of the valve in response to the valve opening or closing, and determine the corresponding standard sub-range based on the current aging score.

[0011] The analysis module is used to train a valve resistance model based on the historical data. In response to the valve opening or closing, it obtains a standard resistance curve based on the valve resistance model, compares the standard resistance curve with the standard sub-interval, and determines whether the standard resistance curve is accurate based on the comparison result. In response to the accuracy of the standard resistance curve, it obtains the real-time resistance curve when the valve is opening or closing. It obtains an abnormal resistance curve based on the real-time resistance curve and the standard resistance curve, and determines whether the valve operation meets the preset standard based on the abnormal resistance curve. In response to the valve operation meeting the preset standard, it corrects the hydraulic pressure of the pneumatic-hydraulic linkage module for the next valve opening or closing based on the real-time resistance curve.

[0012] The historical data includes resistance-related parameters, valve type data, and status parameters, among which:

[0013] The resistance-related parameters include: the temperature of the gas inside the pipeline and the water dew point;

[0014] The valve type data includes: valve diameter and sealing material;

[0015] The status parameters include: the standard resistance curve when the valve is open or closed, and the gas pressure in the pipeline.

[0016] As a preferred technical solution for a hydraulic control system based on pneumatic-hydraulic linkage, the pneumatic-hydraulic linkage module includes: a pneumatic-hydraulic linkage unit and a manual control unit;

[0017] The pneumatic-hydraulic linkage unit includes: a pneumatic pressure source 1, a root manual valve 2, a one-way valve 3, a pneumatic source filter 4, a gas storage tank 6, a main control pressure valve 9, a main pressure reducing valve 11, a pneumatic reversing valve 16, a pneumatic-hydraulic conversion tank 18, a pneumatic action valve 20, an actuator 22, and a pneumatic-hydraulic linkage ball valve 26, which are connected in series via pipelines.

[0018] Wherein: two pneumatic reversing valves 16 are configured, each equipped with a speed regulating valve 17 and a silencer 25, and a pipeline connecting the two pneumatic reversing valves 16 is provided with a secondary pressure reducing valve 12, an opening solenoid valve 13, a closing solenoid valve 14 and an ESD solenoid valve 15.

[0019] The gas source filter 4 is also equipped with a first drain valve 5; the gas storage tank 6 is equipped with a safety valve 7, an instrument valve 8 and a second drain valve 10; the gas-liquid conversion tank 18 is equipped with a third drain port 19;

[0020] The manual control unit includes: a manual actuation valve 21, a manual directional valve 24, and a manual hydraulic device 23.

[0021] As a preferred technical solution for a hydraulic control system based on pneumatic-hydraulic linkage, the automatic control circuit of the manual control unit and the pneumatic-hydraulic linkage module is interlocked through the pneumatic action valve 20 and the manual action valve 21. In response to the opening of the manual action valve 21, the pneumatic action valve 20 automatically cuts off the air supply.

[0022] As a preferred technical solution for a hydraulic control system based on pneumatic-hydraulic linkage, the standard resistance value range corresponding to the opening or closing of the valve is divided into several standard sub-ranges according to the aging score, including:

[0023] For each valve opening or closing in historical data, the corresponding valve usage time, usage frequency, and status parameters are obtained. Weight values ​​are assigned to usage time, usage frequency, and gas pressure in the pipeline. The sum of the products of usage time, usage frequency, and gas pressure in the pipeline with the weight values ​​is calculated and recorded as the aging score.

[0024] Obtain the aging score corresponding to each opening or closing of the valve, and obtain the aging score range;

[0025] The aging score interval is divided into several sub-score intervals according to the preset step size;

[0026] Obtain the standard resistance curve corresponding to the aging score in each sub-interval of the real-time historical data. Based on the standard resistance curve, obtain the standard resistance value interval corresponding to each valve opening or closing. Take the union of the standard resistance value intervals corresponding to each opening or closing and record it as the standard sub-interval.

[0027] As a preferred technical solution for a hydraulic control system based on pneumatic-hydraulic linkage, the step of training the valve resistance model based on the historical data includes:

[0028] The state parameters in the historical data are obtained to generate a training dataset. The historical data in the training dataset also correspond to the resistance-related parameters and valve type data of the hydraulic control system during operation. The valve resistance model is generated by training based on the training dataset. If the resistance-related parameters, valve type data and gas pressure in the pipeline are input, the standard resistance curve when the valve is open or closed is output.

[0029] As a preferred technical solution for a hydraulic control system based on pneumatic-hydraulic linkage, the step of comparing the standard resistance curve with the standard sub-interval and determining the accuracy of the standard resistance curve based on the comparison result includes:

[0030] Obtain the standard sub-interval, obtain the standard resistance curve according to the valve resistance model, compare the standard resistance curve with the standard sub-interval, and determine whether the standard resistance curve is accurate based on the comparison result. If the resistance values ​​corresponding to the standard resistance curve are all within the standard sub-interval, it is determined that the standard resistance curve output by the valve resistance model is accurate.

[0031] In response to the existence of a resistance value corresponding to the standard resistance curve outside the standard sub-interval, the standard resistance curve output by the valve resistance model is determined to be inaccurate. The analysis module automatically corrects the valve resistance model based on historical data.

[0032] As a preferred technical solution for a hydraulic control system based on pneumatic-hydraulic linkage, the method of responding accurately to a standard resistance curve, acquiring the real-time resistance curve when the valve is open or closed, and acquiring abnormal resistance curves based on the real-time resistance curve and the standard resistance curve includes:

[0033] Establish a Cartesian coordinate system with the valve opening value on the horizontal axis and the resistance value on the vertical axis;

[0034] In a Cartesian coordinate system, generate real-time resistance curves and standard resistance curves;

[0035] For a single valve opening value, the abnormal resistance value is obtained by subtracting the resistance value of the standard resistance curve from the resistance value of the real-time resistance curve. The abnormal resistance values ​​corresponding to other valve opening values ​​are calculated, and the abnormal resistance curve is determined based on the calculation results.

[0036] As a preferred technical solution for a hydraulic control system based on pneumatic-hydraulic linkage, the method of judging whether the operation of the valve meets the preset standard based on the abnormal resistance curve is used. In response to the resistance value of the abnormal resistance curve being less than the resistance threshold, it is determined that the operation of the valve meets the preset standard.

[0037] If a point on the abnormal resistance curve has a resistance value greater than or equal to the resistance threshold, it is determined that the valve operation does not meet the preset standard, and a maintenance notice is issued.

[0038] As a preferred technical solution for a hydraulic control system based on pneumatic-hydraulic linkage, the step of correcting the hydraulic pressure of the pneumatic-hydraulic linkage module according to the real-time resistance curve when the valve opens or closes for the next time includes:

[0039] Obtain the real-time resistance curve. The correction range is positively correlated with the maximum resistance value of the real-time resistance curve. The larger the maximum resistance value of the real-time resistance curve, the greater the corrected hydraulic pressure.

[0040] This invention also provides a hydraulic control method based on pneumatic-hydraulic linkage, comprising:

[0041] The gas pressure in the pipeline is used as a power source to control the opening or closing of the valve;

[0042] The operating parameters of the hydraulic control system are monitored during operation, and historical data is generated.

[0043] Transmit the historical data;

[0044] Based on the historical data, the aging score is calculated. Based on the aging score, the standard resistance value range corresponding to the valve opening or closing is divided into several standard sub-ranges. In response to the valve opening or closing, the current aging score of the valve is calculated and the corresponding standard sub-range is determined based on the current aging score.

[0045] A valve resistance model is trained based on the historical data. In response to valve opening or closing, a standard resistance curve is obtained based on the valve resistance model. The standard resistance curve is compared with the standard sub-interval. The accuracy of the standard resistance curve is determined based on the comparison result. If the standard resistance curve is accurate, the real-time resistance curve when the valve is opened or closed is obtained. An abnormal resistance curve is obtained based on the real-time resistance curve and the standard resistance curve. The valve operation is determined based on the abnormal resistance curve to determine whether it meets the preset standard. If the valve operation meets the preset standard, the hydraulic pressure of the pneumatic-hydraulic linkage module is corrected for the next valve opening or closing based on the real-time resistance curve.

[0046] Compared with existing technologies, the advantages of this invention are as follows: Firstly, this invention stores gas pressure in a gas storage tank. When the valve needs to be closed, the gas stored in the tank drives the valve to open or close, solving the problem of energy access difficulties around gas pipelines in real life and reducing the deployment cost of supporting facilities after pipeline laying. Secondly, this invention calculates aging scores and divides historical data according to the aging scores to generate several standard sub-intervals. By constructing a valve resistance model, it obtains the standard resistance curve caused by normal aging of the valve. The resistance curve generated by the model is compared with the standard sub-intervals to verify the model's output results, thereby increasing the accuracy of the model's output results. Furthermore, it obtains the real-time resistance curve during the valve closing process and determines the abnormal resistance curve based on the difference between the ordinate of the real-time resistance curve and the standard resistance curve. Based on the abnormal resistance curve, it judges whether the valve operation meets preset standards. When the valve's operating state meets the preset standards, the hydraulic pressure is adjusted according to the real-time resistance curve, thereby avoiding sluggish valve operation caused by increased resistance during use.

[0047] In detail, during the use of valves, in addition to the major influencing parameters contained in historical data, they are also subject to minor influences from various other factors, resulting in slight differences in aging rates. Different degrees of oxidation may correspond to the same aging score but different standard resistance value curves. Therefore, by calculating the aging score through historical data and selecting the union of the standard resistance value intervals of several standard resistance curves corresponding to the aging score, the range of resistance values ​​during normal aging of the valve can be obtained based on the aging score. Exceeding this range indicates that the aging degree of the valve is abnormal. This allows for the verification of the valve resistance model output based on historical data, increasing the accuracy of subsequent judgments. Attached Figure Description

[0048] Figure 1 This is a structural block diagram of a hydraulic control system based on pneumatic-hydraulic linkage according to an embodiment of the present invention;

[0049] Figure 2 This is a structural diagram of the gas-liquid linkage module according to an embodiment of the present invention;

[0050] Figure 3 This is a flowchart illustrating the steps of a hydraulic control method based on pneumatic-hydraulic linkage according to an embodiment of the present invention.

[0051] In the diagram: 1. Air pressure source; 2. Root manual valve; 3. Check valve; 4. Air source filter; 5. First drain valve; 6. Air tank; 7. Safety valve; 8. Instrument valve; 9. Main control pressure valve; 10. Second drain valve; 11. Main pressure reducing valve; 12. Auxiliary pressure reducing valve; 13. Open solenoid valve; 14. Close solenoid valve; 15. ESD solenoid valve; 16. Pneumatic directional valve; 17. Speed ​​control valve; 18. Gas-liquid conversion tank; 19. Third drain port; 20. Pneumatic action valve; 21. Manual action valve; 22. Actuator; 23. Manual hydraulic device; 24. Manual directional valve; 25. Silencer; 26. Pneumatic-liquid linkage ball valve. Detailed Implementation

[0052] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0053] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0054] Please see Figure 1 As shown, it is a structural block diagram of a low-latency wireless transmission control system based on an industrial scenario according to an embodiment of the present invention, including:

[0055] The gas-liquid linkage module is used to control the opening or closing of valves by using the gas pressure in the pipeline as a power source.

[0056] The detection module is used to detect the operating parameters of the hydraulic control system during operation and generate historical data.

[0057] The data transmission module is used to transmit historical data;

[0058] The aging assessment module is used to calculate the aging score based on historical data. Based on the aging score, the standard resistance value range corresponding to the valve opening or closing is divided into several standard sub-ranges. In response to the valve opening or closing, the current aging score of the valve is calculated and the corresponding standard sub-range is determined based on the current aging score.

[0059] The analysis module is used to train a valve resistance model based on historical data. In response to valve opening or closing, it obtains a standard resistance curve based on the valve resistance model, compares the standard resistance curve with a standard sub-interval, and determines whether the standard resistance curve is accurate based on the comparison result. In response to the accuracy of the standard resistance curve, it obtains the real-time resistance curve measured by the detection module when the valve is open or closed. Based on the real-time resistance curve and the standard resistance curve, it obtains an abnormal resistance curve and determines whether the valve operation meets the preset standard based on the abnormal resistance curve. In response to the valve operation meeting the preset standard, it corrects the hydraulic pressure of the pneumatic-hydraulic linkage module for the next valve opening or closing based on the real-time resistance curve.

[0060] Historical data includes resistance-related parameters, valve type data, and status parameters, among which:

[0061] Resistance-related parameters include: the temperature of the gas inside the pipe and the water dew point;

[0062] Valve type data includes: valve diameter and sealing material;

[0063] The status parameters include: the standard resistance curve when the valve is open or closed, and the gas pressure in the pipeline.

[0064] In implementation, the data transmission module is also used to transmit remote control data and other data required during operation; it acquires the gas temperature inside the pipeline via a temperature sensor, and obtains the water dew point and gas pressure in the pipeline from the local database of the gas transfer station. Valve type data is obtained from the local database. The standard resistance curve, which describes the change in resistance during valve opening and closing, is acquired via a hydraulic pressure sensor.

[0065] Furthermore, on the one hand, this invention uses the gas pressure in the pipeline as a power source, eliminating the need for additional energy consumption to drive the valve's opening and closing, thereby reducing energy demand during gas pipeline transportation and minimizing restrictions on pipeline installation. On the other hand, this invention calculates an aging score and divides the standard resistance value range in historical data into several standard sub-ranges based on the aging score. This allows for the determination of the accuracy of the standard resistance curve output by the subsequent model, providing an accurate data foundation for obtaining subsequent abnormal pressure curves, and thus enabling an accurate assessment of the valve's health status.

[0066] Please see Figure 2 As shown, it is a structural diagram of the gas-liquid linkage module of an embodiment of the present invention. The gas-liquid linkage module includes: a gas-liquid linkage unit and a manual control unit.

[0067] The pneumatic-hydraulic linkage unit includes: a pneumatic pressure source 1, a root manual valve 2, a one-way valve 3, a pneumatic source filter 4, a gas storage tank 6, a main control pressure valve 9, a main pressure reducing valve 11, a pneumatic reversing valve 16, a pneumatic-hydraulic conversion tank 18, a pneumatic action valve 20, an actuator 22, and a pneumatic-hydraulic linkage ball valve 26, which are connected in series via pipelines.

[0068] Among them: two pneumatic reversing valves 16 are configured, each equipped with a speed regulating valve 17 and a silencer 25. The two pneumatic reversing valves 16 are connected by a pipeline with an opening solenoid valve 13, a secondary pressure reducing valve 12, an ESD solenoid valve 15 and a closing solenoid valve 14.

[0069] The gas source filter 4 is also equipped with a first drain valve 5; the gas storage tank 6 is equipped with a safety valve 7, an instrument valve 8 and a second drain valve 10; the gas-liquid conversion tank 18 is equipped with a third drain port 19;

[0070] The manual control unit includes: a manual actuation valve 21, a manual directional valve 24, and a manual hydraulic device 23.

[0071] The automatic control circuit of the manual control unit and the pneumatic-hydraulic linkage module is interlocked through the pneumatic action valve 20 and the manual action valve 21. In response to the opening of the manual action valve 21, the pneumatic action valve 20 automatically cuts off the gas supply.

[0072] In detail, taking the gas pressure in the natural gas pipeline as power source 1 as an example, the operation process of the gas-liquid linkage module is as follows:

[0073] Open the root manual valve 2, and natural gas enters the gas source filter 4 through the one-way valve 3. The gas source filter 4 is equipped with a first drain valve 5 to drain the gas periodically, ensuring the cleanliness of the gas and the reliable operation of downstream pneumatic accessories.

[0074] Gas enters the gas storage tank 6. The volume of the gas storage tank 6 can be calculated according to customer requirements, such as ensuring that the valve of the gas storage tank 6 can open and close once when gas supply is lost. The gas storage tank 6 is equipped with a safety valve 7, whose working pressure is set according to the gas pressure to ensure the safe use of the system. The gas storage tank 6 is equipped with an instrument valve 8 for real-time monitoring of pressure data. The gas storage tank 6 is equipped with a second drain valve 10 to realize the periodic drainage of the gas storage tank. The outlet of the gas storage tank 6 is equipped with a main pressure control valve 9, which can adjust the system's operating pressure according to fluctuations in the inlet gas pressure.

[0075] Gas enters the main pressure reducing valve 11 through the main pressure control valve 9. The main pressure reducing valve 11 is used to precisely regulate the pressure and filter the gas. The main pressure reducing valve 11 is connected to the auxiliary pressure reducing valve 12 through a pipeline. The auxiliary pressure reducing valve 12 is a backup pressure reducing valve device, which can effectively ensure the operation of the system when the main pressure reducing valve 11 fails.

[0076] The pneumatic-hydraulic linkage module has two valve opening and closing methods, including:

[0077] Remote valve control: First, confirm that the pneumatic valve 20 is open and the manual valve 21 is closed. Click the valve open button on the control box (this process is achieved remotely from the control room, which also includes an aging assessment module and an analysis module). This activates the solenoid valve 13, controlling the right-side pneumatic directional valve 16 to open. Gas enters the right-side gas-liquid conversion tank 18, which contains an air bladder and an appropriate amount of hydraulic oil added according to the oil consumption of the actuator 22. The gas enters the air bladder in the gas-liquid conversion tank 18, causing it to expand and compress the hydraulic oil inside. This compresses the hydraulic oil in the gas-liquid conversion tank 18, which then enters the oil inlet of the right-side actuator 22's cylinder, pushing the actuator 22 to perform mechanical movement and rotate the pneumatic-hydraulic ball valve 26, thus opening the valve.

[0078] Simultaneously, the left piston moves, causing the hydraulic oil in the left cylinder to return to the left pneumatic-hydraulic conversion tank 18. At this time, the left pneumatic directional valve 16 opens to release air, and the gas in the left air chamber, under the force of the hydraulic oil, is discharged through the left pneumatic directional valve 20, the speed control valve 17, and the muffler 25. The speed control valve 17 adjusts the speed of the actuator 22 by regulating the amount of air released. The muffler 25 reduces noise. Similarly, pressing the valve close button initiates the above-described actions from the left side, closing the valve.

[0079] The ESD solenoid valve 15 is a key accessory for remote control, and the control room uses the signal conversion of the ESD solenoid valve to control the operation of the system.

[0080] Using the manual-actuated valve 21 to open or close: When pneumatic operation cannot support the system, the valve can be opened or closed using the manual control unit. First, close both pneumatic valves 20 and open both manual-actuated valves 21. Turn the manual directional valve 24 handle to the open position and press the handle up or down. Hydraulic oil directly enters the right cylinder of the actuator 22, opening the valve. The hydraulic oil in the left cylinder returns to the tank. Similarly, turn the manual directional valve 21 handle to the closed position and press the handle to close the valve.

[0081] Furthermore, based on the aging score, the standard resistance value range corresponding to the valve opening or closing is divided into several standard sub-ranges, including:

[0082] For each valve opening or closing in historical data, the corresponding valve usage time, usage frequency, and status parameters are obtained. Weight values ​​are assigned to usage time, usage frequency, and gas pressure in the pipeline. The sum of the products of usage time, usage frequency, and gas pressure in the pipeline with the weight values ​​is calculated and recorded as the aging score.

[0083] Obtain the aging score corresponding to each opening or closing of the valve, and obtain the aging score range;

[0084] The aging score interval is divided into several sub-score intervals according to the preset step size;

[0085] Obtain the standard resistance curve corresponding to the aging score in each sub-score interval of the historical data. Based on the standard resistance curve, obtain the standard resistance value interval corresponding to each valve opening or closing. Take the union of the standard resistance value intervals corresponding to each opening or closing and record it as the standard sub-interval.

[0086] In practice, the aging score interval is obtained as follows: Historical data is collected on the usage time, number of uses, state parameters, and standard resistance curves of valves that were repaired or replaced due to natural aging (if these are unavailable or insufficient, aging tests are conducted to obtain the corresponding standard resistance curves). The aging score for each valve is calculated, and the maximum value is taken. The aging score for the new valve is set to 0. The interval between 0 and the maximum value is recorded as the aging score interval. It is understandable that during actual valve use, as the valve ages, the resistance during valve opening and closing gradually increases. Each aging condition has a corresponding aging score and a standard resistance curve; that is, there is a correlation between the standard resistance curve and the aging score.

[0087] Specifically, the standard sub-interval is determined as follows: For a single sub-score interval, the standard resistance curves corresponding to all aging scores in the sub-score interval are obtained from historical data; each standard resistance curve is analyzed accordingly, and the resistance values ​​corresponding to the maximum and minimum values ​​of the vertical coordinate in the coordinate system are obtained. The interval formed by the resistance values ​​corresponding to the maximum and minimum values ​​is recorded as the standard resistance value interval corresponding to the aging score of the standard resistance curve; the union of the standard resistance value intervals corresponding to each aging score in the same sub-score interval is recorded as the standard sub-interval corresponding to that sub-score interval.

[0088] It should be noted that, for historical data on a single valve opening or closing, the corresponding valve usage time, usage frequency, and status parameters are obtained. This data represents valves under normal aging conditions without abnormal resistance, or with abnormal resistance but whose impact on the resistance during opening or closing is less than 1%. The weights of usage time, usage frequency, and gas pressure in the pipeline are all set by the system, and the sum of these weights equals 1. The preset step size is selected based on the aging score range and actual conditions. In this embodiment, the aging score range is 0-180 points. Based on the computing power of the computer performing the calculations and the aging score range of 0-180 points, a preset step size of 20 points is selected. The standard sub-range corresponding to a single sub-score range is obtained, and the correspondence between the sub-score range and the standard sub-range is stored as data in the control room's database.

[0089] In detail, during the use of a valve, as the valve gradually ages, the resistance when opening or closing the valve will increase, and there is a certain correlation between the two. The normal aging of the valve is affected by a variety of factors. This invention calculates a weighted sum by adding weight values ​​to multi-dimensional data, avoiding the situation where single-dimensional data is affected by the environment and thus leads to inaccurate evaluation results. Based on the aging score and historical data, the correlation between the aging score and resistance during normal aging is obtained, thereby judging the output results of the subsequent model and increasing the detection accuracy of the valve's operating status.

[0090] Furthermore, a valve resistance model is trained based on historical data, including:

[0091] The system obtains state parameters from historical data to generate a training dataset. The historical data in the training dataset also includes resistance-related parameters and valve type data of the hydraulic control system during operation. The system trains and generates a valve resistance model based on the training dataset. If the input is resistance-related parameters, valve type data, and gas pressure in the pipeline, the system outputs the standard resistance curve when the valve is open or closed.

[0092] In implementation, the training dataset contains historical data for 100 valves of each valve model. Each valve's historical data includes 500 opening and closing records. Each opening and closing record includes resistance-related parameters, valve type data, and status parameters. These parameters are highly correlated with the valve's aging degree and the resistance during opening and closing. The process of building and training the model based on known data is existing technology and will not be elaborated upon here.

[0093] Furthermore, this invention constructs a valve resistance model to obtain resistance curves during normal valve aging and valve closing processes, providing an accurate data foundation for subsequently obtaining abnormal resistance curves based on real-time resistance curves and standard resistance curves, thereby increasing the detection accuracy of valve operating status.

[0094] Furthermore, the standard resistance curve is compared with a standard sub-interval, and the accuracy of the standard resistance curve is determined based on the comparison results, including:

[0095] Obtain a standard sub-interval, obtain a standard resistance curve based on the valve resistance model, compare the standard resistance curve with the standard sub-interval, and if the resistance values ​​corresponding to the standard resistance curve are all within the standard sub-interval, it is determined that the standard resistance curve output by the valve resistance model is accurate.

[0096] In response to the existence of a resistance value corresponding to the standard resistance curve outside the standard sub-interval, the standard resistance curve output by the valve resistance model is determined to be inaccurate. The analysis module automatically corrects the valve resistance model based on historical data.

[0097] Furthermore, in response to the accuracy of the standard resistance curve output by the valve resistance model, the real-time resistance curve when the valve is open or closed is obtained. Based on the real-time resistance curve and the standard resistance curve, abnormal resistance curves are obtained, including:

[0098] Establish a Cartesian coordinate system with the valve opening value on the horizontal axis and the resistance value on the vertical axis;

[0099] In a Cartesian coordinate system, generate real-time resistance curves and standard resistance curves;

[0100] For a single valve opening value, the abnormal resistance value is obtained by subtracting the resistance value of the standard resistance curve from the resistance value of the real-time resistance curve. The abnormal resistance values ​​corresponding to other valve opening values ​​are calculated, and the abnormal resistance curve is determined based on the calculation results.

[0101] Furthermore, the valve's operation is judged to meet the preset standard based on the abnormal resistance curve. If the resistance value of the abnormal resistance curve is less than the resistance threshold, the valve's operation is judged to meet the preset standard.

[0102] If a point on the abnormal resistance curve has a resistance value greater than or equal to the resistance threshold, it is determined that the valve operation does not meet the preset standard, and a maintenance notice is sent to the control room.

[0103] In implementation, the resistance threshold is dynamically selected based on 1.2 times the upper limit of the standard sub-interval. The valve opening value is detected by an angular displacement sensor installed on the pneumatic-hydraulic ball valve 26.

[0104] Furthermore, upon the next opening or closing of the valve, the hydraulic pressure of the pneumatic-hydraulic linkage module is corrected based on the real-time resistance curve, including:

[0105] Obtain the real-time resistance curve. The correction range is positively correlated with the maximum resistance value of the real-time resistance curve. The larger the maximum resistance value of the real-time resistance curve, the greater the hydraulic pressure when the valve is opened or closed next after correction.

[0106] In practice, hydraulic pressure is adjusted by establishing a mapping table between the real-time maximum resistance value and the pressure correction range. The range of the pressure correction range is determined based on the current pressure value, the maximum hydraulic pressure value under safe conditions, and other actual conditions.

[0107] Please see Figure 3 The diagram shown is a flowchart of the steps of a hydraulic control method based on pneumatic-hydraulic linkage according to an embodiment of the present invention, including:

[0108] Step S1: Use the gas pressure in the pipeline as a power source to control the opening or closing of the valve;

[0109] Step S2: Detect the operating parameters of the hydraulic control system during operation and generate historical data;

[0110] Step S3: Transmit historical data;

[0111] Step S4: Calculate the aging score based on historical data. Divide the standard resistance value range corresponding to the valve opening or closing into several standard sub-ranges based on the aging score. In response to the valve opening or closing, calculate the current aging score of the valve and determine the corresponding standard sub-range based on the current aging score.

[0112] Step S5: Train the valve resistance model based on historical data. In response to valve opening or closing, obtain a standard resistance curve based on the valve resistance model. Compare the standard resistance curve with a standard sub-interval. Determine the accuracy of the standard resistance curve based on the comparison result. If the standard resistance curve is accurate, obtain the real-time resistance curve measured by the detection module when the valve is opening or closing. Obtain an abnormal resistance curve based on the real-time resistance curve and the standard resistance curve. Determine whether the valve operation meets the preset standard based on the abnormal resistance curve. If the valve operation meets the preset standard, correct the hydraulic pressure of the pneumatic-hydraulic linkage module for the next valve opening or closing based on the real-time resistance curve.

[0113] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A hydraulic control system based on pneumatic-hydraulic linkage, characterized in that, include: The gas-liquid linkage module is used to control the opening or closing of valves by using the gas pressure in the pipeline as a power source. The detection module is used to detect the operating parameters of the hydraulic control system during operation and generate historical data. The data transmission module is used to transmit the historical data; The aging assessment module is used to calculate the aging score based on the historical data, divide the standard resistance value range corresponding to the valve opening or closing into several standard sub-ranges based on the aging score, calculate the current aging score of the valve in response to the valve opening or closing, and determine the corresponding standard sub-range based on the current aging score. The analysis module is used to train a valve resistance model based on the historical data. In response to the valve opening or closing, it obtains a standard resistance curve based on the valve resistance model, compares the standard resistance curve with the standard sub-interval, and determines whether the standard resistance curve is accurate based on the comparison result. In response to the accuracy of the standard resistance curve, it obtains the real-time resistance curve when the valve is opening or closing, obtains an abnormal resistance curve based on the real-time resistance curve and the standard resistance curve, and determines whether the valve operation meets a preset standard based on the abnormal resistance curve. In response to the valve operation meeting the preset standard, it corrects the hydraulic pressure of the pneumatic-hydraulic linkage module based on the real-time resistance curve when the valve is opened or closed again. The historical data includes resistance-related parameters, valve type data, and status parameters, among which: The resistance-related parameters include: the temperature of the gas inside the pipeline and the water dew point; The valve type data includes: valve diameter and sealing material; The status parameters include: the standard resistance curve when the valve is open or closed, and the gas pressure in the pipeline; The standard resistance value range corresponding to the opening or closing of the valve is divided into several standard sub-ranges based on the aging score, including: For each valve opening or closing in historical data, the corresponding valve usage time, usage frequency, and status parameters are obtained. Weight values ​​are assigned to usage time, usage frequency, and gas pressure in the pipeline. The sum of the products of usage time, usage frequency, and gas pressure in the pipeline with their respective weight values ​​is calculated and recorded as the aging score. Obtain the aging score of valves of the same type from historical data each time they are opened or closed, and obtain the aging score range. The aging score interval is divided into several sub-score intervals according to the preset step size; Obtain the standard resistance curve corresponding to the aging score in each sub-score interval of the real-time historical data. Based on the standard resistance curve, obtain the standard resistance value interval corresponding to each valve opening or closing. Take the union of the standard resistance value intervals corresponding to each opening or closing and record it as the standard sub-interval. The step of correcting the hydraulic pressure of the pneumatic-hydraulic linkage module based on the real-time resistance curve during the next valve opening or closing includes: Obtain the real-time resistance curve. The correction range is positively correlated with the maximum resistance value of the real-time resistance curve. The larger the maximum resistance value of the real-time resistance curve, the greater the corrected hydraulic pressure.

2. The hydraulic control system based on pneumatic-hydraulic linkage according to claim 1, characterized in that, The gas-liquid linkage module includes: a gas-liquid linkage unit and a manual control unit; The pneumatic-hydraulic linkage unit includes: a pneumatic pressure source (1), a root manual valve (2), a check valve (3), a pneumatic source filter (4), a gas storage tank (6), a main control pressure valve (9), a main pressure reducing valve (11), a pneumatic directional valve (16), a pneumatic-hydraulic conversion tank (18), a pneumatic action valve (20), an actuator (22), and a pneumatic-hydraulic linkage ball valve (26), which are connected in series via pipelines. Among them: the pneumatic reversing valve (16) is configured as two, each equipped with a speed regulating valve (17) and a silencer (25), and the two pneumatic reversing valves (16) are connected by a pipeline with an opening solenoid valve (13), a secondary pressure reducing valve (12), an ESD solenoid valve (15) and a closing solenoid valve (14). The gas source filter (4) is also equipped with a first drain valve (5); the gas storage tank (6) is equipped with a safety valve (7), an instrument valve (8) and a second drain valve (10); the gas-liquid conversion tank (18) is equipped with a third drain port (19). The manual control unit includes: a manual actuation valve (21), a manual directional valve (24), and a manual hydraulic device (23).

3. The hydraulic control system based on pneumatic-hydraulic linkage according to claim 2, characterized in that, The automatic control circuit of the manual control unit and the pneumatic-hydraulic linkage module is interlocked through the pneumatic action valve (20) and the manual action valve (21). In response to the opening of the manual action valve (21), the pneumatic action valve (20) automatically cuts off the gas source.

4. The hydraulic control system based on pneumatic-hydraulic linkage according to claim 1, characterized in that, The step of training the valve resistance model based on the historical data includes: The state parameters in the historical data are obtained to generate a training dataset. The historical data in the training dataset also correspond to the resistance-related parameters of the hydraulic control system during operation and valve type data. The valve resistance model is generated by training based on the training dataset. If the resistance-related parameters, valve type data and gas pressure in the pipeline are input, the standard resistance curve when the valve is open or closed is output.

5. The hydraulic control system based on pneumatic-hydraulic linkage according to claim 4, characterized in that, The step of comparing the standard resistance curve with the standard sub-interval and determining the accuracy of the standard resistance curve based on the comparison result includes: Obtain the standard sub-interval, obtain the standard resistance curve according to the valve resistance model, compare the standard resistance curve with the standard sub-interval, and if the resistance value corresponding to the standard resistance curve is within the standard sub-interval, it is determined that the standard resistance curve output by the valve resistance model is accurate. In response to the existence of a resistance value corresponding to the standard resistance curve outside the standard sub-interval, the standard resistance curve output by the valve resistance model is determined to be inaccurate. The analysis module automatically corrects the valve resistance model based on historical data.

6. The hydraulic control system based on pneumatic-hydraulic linkage according to claim 5, characterized in that, The method of responding accurately to the standard resistance curve, obtaining the real-time resistance curve when the valve is open or closed, and obtaining the abnormal resistance curve based on the real-time resistance curve and the standard resistance curve includes: Establish a Cartesian coordinate system with the valve opening value on the horizontal axis and the resistance value on the vertical axis; In a Cartesian coordinate system, generate real-time resistance curves and standard resistance curves; For a single valve opening value, the abnormal resistance value is obtained by subtracting the resistance value of the standard resistance curve from the resistance value of the real-time resistance curve. The abnormal resistance values ​​corresponding to other valve opening values ​​are calculated, and the abnormal resistance curve is determined based on the calculation results.

7. The hydraulic control system based on pneumatic-hydraulic linkage according to claim 6, characterized in that, The method of determining whether the valve operation meets the preset standard based on the abnormal resistance curve is determined when the resistance value of the abnormal resistance curve is less than the resistance threshold. If a point on the abnormal resistance curve has a resistance value greater than or equal to the resistance threshold, it is determined that the valve operation does not meet the preset standard, and a maintenance notice is issued.

8. A hydraulic control method based on pneumatic-hydraulic linkage, implemented based on the hydraulic control system based on pneumatic-hydraulic linkage as described in any one of claims 1 to 7, characterized in that, include: The gas pressure in the pipeline is used as a power source to control the opening or closing of the valve; The operating parameters of the hydraulic control system are monitored during operation, and historical data is generated. Transmit the historical data; Based on the historical data, the aging score is calculated. Based on the aging score, the standard resistance value range corresponding to the valve opening or closing is divided into several standard sub-ranges. In response to the valve opening or closing, the current aging score of the valve is calculated and the corresponding standard sub-range is determined based on the current aging score. A valve resistance model is trained based on the historical data. In response to valve opening or closing, a standard resistance curve is obtained based on the valve resistance model. The standard resistance curve is compared with the standard sub-interval. The accuracy of the standard resistance curve is determined based on the comparison result. If the standard resistance curve is accurate, the real-time resistance curve when the valve is opened or closed is obtained. An abnormal resistance curve is obtained based on the real-time resistance curve and the standard resistance curve. The valve operation is determined based on the abnormal resistance curve to determine whether it meets the preset standard. If the valve operation meets the preset standard, the hydraulic pressure of the pneumatic-hydraulic linkage module is corrected for the next valve opening or closing based on the real-time resistance curve.

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