Valve sealing performance detection system, method and device

Abstract

The invention relates to the field of equipment detection, in particular to a valve sealing performance detection system, method and device. The system comprises a parameter input module used for inputting the type, the rated operation speed, the stroke length or angle and the operation torque inherent characteristic curve of a detected valve; the driving motor is rigidly connected with the valve shaft body through the rotating shaft fixing device and used for driving the valve to execute opening and closing actions; the torque detection module is used for detecting a torque value required for driving the valve to act in real time; the stroke detection module is used for detecting the rotating angle or stroke length of the valve shaft body; the central processing unit is used for controlling the driving motor to output torque so as to keep the opening and closing speed of the valve constant, recording a time-varying curve of the torque and comparing the time-varying curve with an inherent characteristic curve so as to judge the sealing performance; and the display module is used for providing real-time display of parameter setting, a detection process and a result. According to the invention, the detection efficiency is improved, the complexity and error of manual detection are reduced, and the hidden danger of internal leakage of the valve can be found more quickly and accurately.

Description

Technical Field

[0001] The present invention relates to the field of equipment detection, and particularly to a valve sealing detection system, method and device. Background Art

[0002] Substations and converter stations, as the core facilities of today's power systems, are internally equipped with a large number of oil-filled equipment, valve cooling systems and fire protection systems. Various valves such as ball valves, butterfly valves and needle valves are widely used in these systems. The sealing performance of these valves is crucial for the safe and stable operation of power equipment. However, there are many problems with current valve sealing detection methods. For example, the detection principle is complex and the calculation process is cumbersome, resulting in strong concealment and difficulty in detecting internal leakage problems of valves. In recent years, there have been many emergencies such as the emergency shutdown of power equipment caused by insufficient valve sealing in the power industry, which not only affects the safe and stable operation of the power grid, but also seriously increases the operation and maintenance burden of professional personnel. Therefore, it is particularly urgent to develop an efficient and accurate valve sealing detection system.

[0003] In the prior art, for example, the invention with the patent number CN118565715A discloses a valve sealing detection method and system. Although this method can detect the sealing performance of valves to a certain extent, it mainly relies on image processing and analysis of temperature distribution maps, and lacks real-time monitoring functions for dynamic torque changes and stroke changes during valve operation, and cannot accurately judge the sealing state of valves during actual operation. In addition, this method needs to frequently obtain image and temperature data during the detection process, with low detection efficiency and high hardware requirements for equipment.

[0004] Aiming at the problems existing in the prior art, this application proposes a valve sealing detection system, method and device. Summary of the Invention

[0005] The purpose of the present invention is to provide a valve sealing detection system, method and device to solve the problems of difficult valve sealing detection, strong concealment of internal leakage hazards and heavy operation and maintenance burden in the prior art.

[0006] To achieve the above purpose, the following technical solutions are adopted.

[0007] A valve sealing detection system includes:

[0008] A parameter input module for inputting the type, rated operating speed, stroke length or angle, and inherent characteristic curve of operating torque of the valve to be detected;

[0009] A driving motor, rigidly connected to the valve shaft through a rotating shaft fixing device, for driving the valve to perform opening and closing actions;

[0010] A torque detection module, which is used to detect the torque value required to drive the valve to act in real time and send the data to the central processing unit;

[0011] A stroke detection module, which is used to detect the rotation angle or stroke length of the valve shaft body and send the data to the central processing unit;

[0012] A central processing unit, which is used to control the driving motor to output torque to keep the valve opening and closing speed constant, record the curve of torque changing with time, and compare it with the inherent characteristic curve to judge the sealing performance;

[0013] A display module, which is used to provide real-time display of parameter settings, detection processes and results.

[0014] Optionally, the torque detection module includes:

[0015] A high-precision torque sensor: installed between the driving motor and the valve shaft body to collect torque data at millisecond intervals; a data preprocessing unit: filter and normalize the collected torque data to eliminate noise interference.

[0016] Optionally, the stroke detection module includes:

[0017] An angle encoder, which is used to measure the rotation angle of the valve shaft body;

[0018] A stroke feedback circuit, which is used to convert the angle data into a stroke length and compare it with a preset stroke threshold to verify the integrity of valve opening and closing.

[0019] Optionally, the central processing unit executes the following control logic:

[0020] A PID control algorithm, which is used to dynamically adjust the output torque of the driving motor according to the real-time detected valve movement speed to keep the valve opening and closing speed constant;

[0021] A curve fitting module, which is used to fit the collected torque data into a non-linear curve according to the time series.

[0022] Optionally, the central processing unit further includes:

[0023] A batch detection mode, which is used to support the detection of multiple valves simultaneously, allocate independent data channels for each valve, and generate independent detection reports;

[0024] A data storage module: stores historical detection data, inherent characteristic curves and algorithm parameters, and supports the traceability and comparative analysis of detection results.

[0025] Optionally, it further includes an emergency stop module, which is used to cut off the power supply of the driving motor in case of emergency to prevent valve damage.

[0026] A method for detecting the sealing performance of a valve, comprising the following steps:

[0027] S1. Input valve parameters and load the inherent characteristic curve;

[0028] S2. Drive the motor to perform the valve opening and closing actions at a constant speed, and synchronously collect torque and stroke data;

[0029] S3. Fit the measured torque curve, and calculate the mean square value of the difference between it and the inherent characteristic curve through the mean square error algorithm MSE;

[0030] S4. If the MSE exceeds the preset variance threshold, it is determined that the sealing performance is unqualified; if it is qualified, further verify the linear correlation through the Pearson correlation coefficient algorithm. When the correlation coefficient is lower than the preset threshold, it is determined that the sealing performance is unqualified, otherwise it is determined that the sealing performance is qualified.

[0031] Optionally, the calculation method of the mean square error algorithm in step S3 is:

[0032]

[0033] where y i is the torque value of the measured curve, is the torque value of the inherent curve, and n is the number of sampling points.

[0034] Optionally, it further includes:

[0035] Perform the opening and closing action test on the newly installed valve for a preset number of times, collect torque data at 1-second intervals and calculate the average value to generate the initial inherent characteristic curve;

[0036] According to the service life and ambient temperature of the valve, adaptively adjust the determination thresholds of MSE and the correlation coefficient.

[0037] Optionally, the constant speed control in step S2 is achieved through the following method:

[0038] PID feedback regulation: Compare the deviation between the actual movement speed of the valve and the rated speed in real time, and dynamically adjust the output torque of the drive motor to make the deviation value approach zero.

[0039] A valve sealing performance detection device, comprising:

[0040] A clamping device for adapting to the shape of the valve and clamping the valve;

[0041] A connecting rod, one end of which is connected to the clamping device and the other end is connected to the drive motor to ensure no slip in torque transmission;

[0042] A measurement module, including a high-precision torque sensor and an angle encoder, encapsulated in a waterproof housing;

[0043] A control analysis module, integrating a parameter input module, a central processing unit and an emergency stop button;

[0044] A display screen, electrically connected to the control analysis module, supporting touch screen operation.

[0045] The central processing unit is electrically connected to the drive motor, the measurement module, the control analysis module and the display screen respectively.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The present invention provides a valve sealing detection system, which solves the problems of difficult detection of valve sealing, strong concealment of internal leakage hazards and heavy operation and maintenance burden through the organic combination of a parameter input module, a drive motor, a torque detection module, a stroke detection module, a central processing unit and a display module. The system can automatically detect the change curve of the valve operation torque and compare it with the inherent torque characteristic curve of the valve, so as to accurately judge the sealing performance of the valve. The automated detection method greatly improves the detection efficiency, reduces the complexity and error of manual detection, enables professionals to more quickly and accurately discover the internal leakage hazards of the valve, take measures in advance, avoid sudden situations such as emergency shutdown of power equipment caused by insufficient valve sealing, effectively ensures the safe and stable operation of power grid equipment, and reduces the operation and maintenance burden of professionals.

[0048] The high-precision torque sensor and data preprocessing unit of the torque detection module can collect torque data at millisecond intervals and perform filtering and normalization processing on it, thereby improving the accuracy and reliability of torque detection and providing a more accurate data basis for subsequent sealing performance judgment. The stroke detection module can not only accurately measure the rotation angle of the valve shaft body through an angle encoder and a stroke feedback circuit, but also convert the angle data into a stroke length and compare it with a preset stroke threshold to further verify the opening and closing integrity of the valve, enhancing the comprehensiveness and accuracy of the detection. The PID control algorithm, curve fitting module, batch detection mode and data storage module of the central processing unit achieve constant control of the valve opening and closing speed, improve the stability of the detection, and at the same time support the simultaneous detection of multiple valves and the retrospective comparison analysis of historical data, further improving the detection efficiency and the practicality of the system. The emergency stop module provides safety protection for the system in case of emergency, preventing valve damage caused by misoperation. The method of the present invention further improves the accuracy and adaptability of sealing detection through the double verification of the mean square error algorithm and the Pearson correlation coefficient algorithm, and adaptively adjusts the judgment threshold according to the service life of the valve and the ambient temperature. The design of the control analysis module and measurement module of the device makes the detection device more convenient to carry and operate, meeting the valve detection requirements in different scenarios. Description of the Drawings

[0049] Figure 1 It is a schematic diagram of modules according to an embodiment of a valve sealing performance detection system of the present invention.

[0050] Figure 2 It is a schematic diagram of the step flow according to an embodiment of a valve sealing performance detection method of the present invention.

[0051] Figure 3 It is a schematic structural diagram according to an embodiment of a valve sealing performance detection device of the present invention.

[0052] Figure 4 It is a schematic diagram of the PID control mode process according to an embodiment of a valve sealing performance detection method of the present invention. Specific embodiments

[0053] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0054] The following detailed descriptions are all exemplary descriptions, aiming to provide further detailed descriptions of the present invention. Unless otherwise specified, all technical terms adopted by the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs. The terms used in the present invention are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present invention.

[0055] Embodiment 1

[0056] As Figure 1 shown, the valve sealing performance detection system of the present invention is a highly automated and intelligent detection device, aiming to solve the problems of difficult valve sealing performance detection, strong concealment of internal leakage hazards, and heavy operation and maintenance burdens in the prior art. The system realizes the efficient detection of valve sealing performance through the collaborative work of multiple modules.

[0057] The parameter input module is one of the core components of the system and is used to input the basic information of the valve to be detected. This information includes the type of the valve (such as ball valve, butterfly valve, needle valve, etc.), the rated operating speed, the stroke length or angle, and the inherent characteristic curve of the operating torque. By inputting these parameters, the system can perform targeted detections according to the specific characteristics of the valve. For example, for valves of different types and specifications, there may be differences in their operating torque and stroke characteristics. By inputting these parameters, the system can adjust the detection logic to meet the requirements of different valves. In practical applications, the parameter input module can be input through a touch screen or a keyboard, and the operator can accurately set according to the actual parameters of the valve. In addition, the parameter input module also supports input through barcode or QR code scanning, further improving the input efficiency and accuracy.

[0058] The drive motor is the power source for realizing the opening and closing actions of the valve and is rigidly connected to the valve shaft through a shaft fixing device. This rigid connection method ensures the stable transmission of torque and avoids detection errors caused by loose connections. In practical applications, the shaft fixing device can be adjusted according to the size and shape of the valve to ensure a tight fit with the valve shaft. For example, for large valves, a more robust fixing device may be required to withstand greater torque. The output torque of the drive motor is controlled by the central processing unit to maintain a constant opening and closing speed of the valve. In some embodiments, the drive motor can use a servo motor to achieve more precise speed and torque control.

[0059] The torque detection module is used to detect the torque value required to drive the valve action in real time. This module includes a high-precision torque sensor and a data preprocessing unit. The high-precision torque sensor is installed between the drive motor and the valve shaft and can collect torque data at millisecond intervals. This high-precision and high-frequency acquisition method ensures the accuracy and real-time nature of the detection data. The data preprocessing unit then filters and normalizes the collected torque data to eliminate noise interference. For example, during actual detection, it may be affected by external electromagnetic interference or mechanical vibration. By filtering, these interference signals can be removed, thereby improving the reliability of the data. In some embodiments, the data preprocessing unit can also perform temperature compensation on the torque data to ensure the accuracy of the data at different ambient temperatures.

[0060] The stroke detection module is used to detect the rotation angle or stroke length of the valve shaft. This module includes an angle encoder and a stroke feedback circuit. The angle encoder can accurately measure the rotation angle of the valve shaft, and the stroke feedback circuit converts the angle data into a stroke length and compares it with a preset stroke threshold to verify the integrity of the valve opening and closing. For example, if the stroke of the valve does not reach the preset threshold, it may mean that there is a blockage or other problems with the valve. These problems can be detected in a timely manner through the stroke feedback circuit. In some embodiments, the stroke detection module can also incorporate a laser displacement sensor to further improve the accuracy of stroke detection.

[0061] The central processing unit is the "brain" of the system, responsible for controlling the output torque of the driving motor to maintain a constant valve opening and closing speed. It adjusts the output torque of the motor in real time through the PID control algorithm to ensure that the valve opening and closing speed conforms to the preset value. At the same time, the central processing unit also records the curve of torque changing with time and compares it with the inherent characteristic curve of the valve's operating torque to judge the valve's sealing performance. In addition, the central processing unit has a batch detection mode, which can detect multiple valves simultaneously, allocate independent data channels for each valve, and generate independent detection reports. The data storage module is used to store historical detection data, inherent characteristic curves, and algorithm parameters, supporting the traceability and comparative analysis of detection results. In some embodiments, the central processing unit can also transmit the detection data to a remote server in real time through a wireless communication module for convenient remote monitoring and data analysis by management personnel.

[0062] The display module provides an intuitive operation interface for users. It can not only display parameter settings and the detection process but also display the detection results in real time. For example, operators can set detection parameters through the display module, observe the valve opening and closing process, and view the final detection report. This real-time display function improves the transparency of detection and the convenience of operation. In some embodiments, the display module can also use the voice prompt function to remind operators of important information or abnormal conditions during the detection process.

[0063] The emergency stop module is an important safety guarantee for the system. In case of an emergency, operators can cut off the power supply of the driving motor through the emergency stop module to prevent valve damage. For example, if abnormal vibration or other dangerous conditions are found during the detection process, operators can immediately trigger the emergency stop module to ensure the safety of the equipment and personnel. In some embodiments, the emergency stop module can also be linked with safety protection devices (such as protective covers) to further improve the safety of the system.

[0064] Through the collaborative work of the above modules, the valve sealing performance detection system of the present invention can achieve efficient and accurate detection of valve sealing performance. It not only solves the problems existing in the prior art but also improves the automation degree, accuracy, and applicability of detection through a variety of innovative technologies.

[0065] Embodiment 2

[0066] As Figure 2 shown, the valve sealing performance detection method of the present invention is based on the above detection system and realizes efficient detection of valve sealing performance through the following steps.

[0067] Before the detection starts, the operator needs to input the basic information of the valve to be detected through the parameter input module, including valve type, rated operating speed, stroke length or angle, and the inherent characteristic curve of the operating torque. These parameters will be loaded into the central processing unit to provide basic data for subsequent detection. The accuracy of the input parameters directly affects the reliability of the detection results. Therefore, the operator needs to set them precisely according to the actual parameters of the valve. For example, for valves of different types and specifications, there may be differences in their operating torque and stroke characteristics. By inputting these parameters, the system can adjust the detection logic to meet the requirements of different valves.

[0068] The drive motor performs the opening and closing actions of the valve at a constant speed according to the instructions of the central processing unit. During this process, the torque detection module and the stroke detection module synchronously collect torque and stroke data. These data will be sent to the central processing unit in real time for processing and analysis. Keeping the opening and closing speed of the valve constant is one of the key factors to ensure the accuracy of the detection results. Through the PID control algorithm, the central processing unit can adjust the output torque of the drive motor in real time to ensure that the opening and closing speed of the valve meets the preset value. For example, if the opening and closing speed of the valve fluctuates during the detection process, the central processing unit can correct the speed deviation by adjusting the motor output torque.

[0069] The central processing unit fits the collected torque data into a non-linear curve according to the time series. Then, it calculates the mean square of the difference between the measured torque curve and the inherent characteristic curve through the mean square error algorithm (MSE). If the MSE exceeds the preset variance threshold, it is determined that the valve seal is unqualified. If the MSE is within the threshold range, the linear correlation is further verified through the Pearson correlation coefficient algorithm. If the correlation coefficient is lower than the preset threshold, it is determined that the seal is unqualified; otherwise, the seal is determined to be qualified. The mean square error algorithm is a commonly used method for evaluating curve similarity. It evaluates the similarity of curves by calculating the square of the difference between each corresponding point of the two curves and then taking the average. The Pearson correlation coefficient algorithm is used to evaluate the linear correlation between two curves. By combining these two algorithms, the system can evaluate the valve seal from multiple angles, improving the accuracy and reliability of the detection.

[0070] For newly installed valves, the system needs to generate an initial inherent characteristic curve. The specific method is to conduct opening and closing action tests on the new valve for a preset number of times (such as 30 times), collect torque data at 1-second intervals and calculate the average value to generate the initial inherent characteristic curve. This process ensures that the system can detect according to the actual characteristics of the new valve. When generating the initial inherent characteristic curve, it is necessary to ensure the stability and consistency of the test environment to avoid the influence of external factors on the test results. For example, external factors such as mechanical vibration and electromagnetic interference should be avoided during the test process.

[0071] To adapt to the service life and ambient temperature of different valves, the system can adaptively adjust the decision thresholds of MSE and correlation coefficients according to these factors. For example, for valves with a longer service life, their sealing performance may decline due to wear, so it is necessary to appropriately adjust the thresholds to adapt to this situation. This adaptive adjustment function improves the flexibility and applicability of the system. In practical applications, the system can automatically adjust the decision thresholds according to pre-set rules or through machine learning algorithms. For example, the system can learn the wear rules of valves based on historical detection data, so as to dynamically adjust the decision thresholds.

[0072] Valve torque control method:

[0073] Under normal circumstances, the stroke traveled by the valve when opening and closing is fixed. Therefore, if the opening or closing speed of the valve is controlled to be constant, the time taken for the valve to open or close is also a fixed value.

[0074] Taking the valve opening as an example, when the clamping device completely clamps the valve switch handle, the moment when the clamping device just starts to move is defined as the 0 moment T1. As the clamping device moves, the time accumulates step by step. When the valve is fully opened, the moment when the clamping device completely stops moving is defined as the end moment T2.

[0075] Then, between the moments T1 and T2, in order to control the moving speed of the clamping device to be constant, the torque exerted by the clamping device on the valve switch handle is a continuously changing quantity. Since the torque changes with time, a curve is formed in the time-torque rectangular coordinate system.

[0076] Adopt the PID control method to adjust the speed in real time, and the adjustment process is as Figure 4 shown.

[0077] Through the above steps, the valve sealing performance detection method of the present invention can achieve efficient and accurate detection of the valve sealing performance. It not only solves the problems existing in the prior art, but also improves the automation degree, accuracy and applicability of the detection through a variety of innovative technologies.

[0078] Embodiment 3

[0079] As Figure 3 shown, the valve sealing performance detection device of the present invention is based on the above detection system, and includes a clamping device, a connecting rod, a measurement module, a control and analysis module, and a display screen. This device realizes efficient detection of the valve sealing performance through the coordinated work of multiple modules.

[0080] The clamping device is used to adapt to the shape of the valve and clamp the valve. It can be adjusted according to the size and shape of different valves to ensure the stability of the valve during the detection process. For example, for ball valves or butterfly valves with different diameters, the clamping device can adapt to different valves by adjusting the clamping force and clamping position. The design of the clamping device needs to consider the diversity of valves and the stability during the detection process. In some embodiments, the clamping device can be pneumatically or hydraulically driven to achieve a more stable clamping effect. The clamping module is at the forefront of the valve state detection device and is in direct contact with the switch handle of the valve. It is composed of several metal plates stacked in sequence, and the metal plates are controlled to move forward or backward by the control module at the rear. The clamping module can form different shapes according to the shape of the valve switch handle to ensure that the handle can be firmly grasped.

[0081] The connecting rod is a key component connecting the clamping device and the driving motor, ensuring no slip during the torque transmission process. Its design uses high-strength materials that can withstand large torque transmissions while ensuring the stability and reliability of the connection. The connecting rod can be customized according to the size and shape of the valve to meet different detection requirements. In some embodiments, the connecting rod can be equipped with a torque limiter. When an abnormal torque occurs during the detection process, the torque limiter can automatically cut off the torque transmission to protect the valve and the detection device from damage. For example, if there is a blockage or other abnormal situation inside the valve during the detection process, it may cause a sharp increase in the torque output by the driving motor. At this time, the torque limiter can cut off the torque transmission in time to avoid further damage to the valve.

[0082] The measurement module is the core part of the detection device, including a high-precision torque sensor and an angle encoder, encapsulated in a waterproof housing. The high-precision torque sensor can collect the torque value required to drive the valve action in real time, and its accuracy can reach the millinewton-meter level to ensure the accuracy of the detection data. The angle encoder is used to measure the rotation angle of the valve shaft body, with an accuracy of up to 0.01 degrees, providing accurate data for the stroke detection of the valve. The design of the waterproof housing enables the measurement module to work properly in a harsh environment. For example, in a humid or water-vapor environment, the waterproof housing can effectively protect the sensor from damage. In some embodiments, the measurement module can also include a temperature sensor to monitor the temperature change of the detection environment in real time and provide a reference for data correction.

[0083] The control and analysis module is the "brain" of the detection device, integrating a parameter input module, a central processing unit, and an emergency stop button. The parameter input module allows operators to input the basic information of the valve to be detected, such as valve type, rated operating speed, stroke length or angle, and the inherent characteristic curve of the operating torque. The central processing unit is responsible for processing the data collected by the measurement module, controlling the operation of the drive motor, and interacting with the operator through the display screen. The emergency stop button cuts off the power supply of the drive motor in case of emergency to ensure the safety of the equipment and personnel. The design of the control and analysis module fully considers the convenience of operation and the reliability of the system. In some embodiments, the control and analysis module can support wireless communication functions to transmit the detection data to a remote server in real time, facilitating remote monitoring and data analysis by management personnel.

[0084] The display screen is electrically connected to the control and analysis module, supports touch screen operation, and provides an intuitive operation interface for operators. The display screen can not only display parameter settings, the detection process, but also display the detection results in real time. For example, operators can set detection parameters through the display screen, observe the opening and closing process of the valve, and view the final detection report. The design of touch screen operation makes the operation more convenient and improves the detection efficiency. In some embodiments, the display screen can also use the voice prompt function to remind operators of important information or abnormal situations during the detection process, further improving the convenience and safety of operation.

[0085] The central processing unit is the core of the control and analysis module, and is electrically connected to the drive motor, the measurement module, the control and analysis module, and the display screen respectively. It is responsible for processing the data collected by the measurement module, controlling the operation of the drive motor, and interacting with the operator through the display screen. The central processing unit uses a high-performance embedded computer system, which can process a large amount of data in real time to ensure the accuracy and stability of the detection process. In some embodiments, the central processing unit can be equipped with machine learning algorithms. By analyzing historical detection data, it can automatically adjust detection parameters to improve the accuracy and reliability of detection. For example, the central processing unit can learn the wear law of the valve based on historical data and dynamically adjust the judgment threshold to meet the valve detection requirements under different service years and environmental conditions.

[0086] Through the collaborative work of the above modules, the valve sealing detection device of the present invention can achieve efficient and accurate detection of valve sealing. It not only solves the problems existing in the prior art, but also improves the automation degree, accuracy and applicability of detection through a variety of innovative technologies. For example, the adaptive design of the clamping device and the use of high-strength materials for the connecting rod ensure the stability and reliability of the detection process; the high-precision sensors and waterproof housing design of the measurement module improve the accuracy of detection data and the durability of the device; the integrated design of the control and analysis module and the touch screen operation of the display screen improve the convenience of operation and the reliability of the system.

[0087] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

Claims

1. A valve sealing performance detection system, characterized in that, Comprising: A parameter input module for inputting the type of the valve to be detected, the rated operating speed, the stroke length or angle, and the inherent characteristic curve of the operating torque; A driving motor rigidly connected to the valve shaft body through a rotating shaft fixing device for driving the valve to perform opening and closing actions; A torque detection module for real-time detecting the torque value required to drive the valve to act and sending the data to the central processing unit; A stroke detection module for detecting the rotation angle or stroke length of the valve shaft body and sending the data to the central processing unit; A central processing unit for controlling the driving motor to output torque to keep the valve opening and closing speed constant, recording the curve of the torque changing with time, and comparing with the inherent characteristic curve to judge the sealing performance; A display module for providing real-time display of parameter settings, detection processes and results.

2. The valve sealing performance detection system according to claim 1, characterized in that The torque detection module includes: A high-precision torque sensor: installed between the driving motor and the valve shaft body, and collecting torque data at millisecond intervals; A data preprocessing unit: filtering and normalizing the collected torque data to eliminate noise interference.

3. A valve sealing performance detection system according to claim 1, characterized in that, The stroke detection module includes: An angle encoder for measuring the rotation angle of the valve shaft body; A stroke feedback circuit for converting the angle data into a stroke length and comparing with a preset stroke threshold to verify the integrity of the valve opening and closing.

4. A valve sealing performance detection system according to claim 1, wherein The central processing unit executes the following control logic: A PID control algorithm for dynamically adjusting the output torque of the driving motor according to the real-time detected valve movement speed to keep the valve opening and closing speed constant; A curve fitting module for fitting the collected torque data into a non-linear curve according to the time series.

5. The valve sealing performance detection system according to claim 4, characterized in that, The central processing unit further includes: A batch detection mode for supporting the detection of multiple valves simultaneously, allocating independent data channels for each valve, and generating independent detection reports; A data storage module: storing historical detection data, inherent characteristic curves and algorithm parameters, and supporting the traceability and comparative analysis of detection results.

6. The valve sealing performance detection system according to claim 1, characterized in that It further includes an emergency stop module for cutting off the power supply of the driving motor in case of emergency to prevent valve damage.

7. A method for detecting the sealing performance of a valve, based on the valve sealing performance detection system according to any one of claims 1-6, characterized in that, Including the following steps: S1. Input valve parameters and load the inherent characteristic curve; S2. The driving motor performs valve opening and closing actions at a constant speed, and synchronously collects torque and stroke data; S3. Fit the measured torque curve and calculate the mean square value of the difference between it and the inherent characteristic curve through the mean square error algorithm MSE; S4. If the MSE exceeds the preset variance threshold, it is determined that the sealing performance is unqualified; if it is qualified, further verify the linear correlation through the Pearson correlation coefficient algorithm, and if the correlation coefficient is lower than the preset threshold, it is determined that the sealing performance is unqualified, otherwise it is determined that the sealing performance is qualified.

8. A method for detecting the sealing performance of a valve according to claim 7, characterized in that, The calculation method of the mean square error algorithm in step S3 is: Among them, y i is the measured curve moment value, is the inherent curve moment value, and n is the number of sampling points.

9. A method for detecting the sealing performance of a valve according to claim 7, characterized in that, It further includes: Performing opening and closing action tests on the newly installed valve for a preset number of times, collecting torque data at 1-second intervals and calculating the average value to generate an initial inherent characteristic curve; Adaptive adjustment of the determination thresholds of MSE and the correlation coefficient according to the service life of the valve and the ambient temperature.

10. A valve sealing performance detection device, based on the valve sealing performance detection system according to any one of claims 1-6, characterized in that, Including: A clamping device for adapting to the valve shape and clamping the valve; A connecting rod, one end of which is connected to the clamping device and the other end is connected to the driving motor to ensure no slip in torque transmission; Measurement module, including a high-precision torque sensor and an angle encoder, encapsulated in a waterproof housing; Control and analysis module, integrating a parameter input module, a central processing unit and an emergency stop button; Display screen, electrically connected to the control and analysis module, supporting touch screen operation; Central processing unit, electrically connected to the drive motor, measurement module, control and analysis module and display screen respectively.

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