Liquid flow standard device detection system and detection calibration method

Abstract

The invention provides a liquid flow standard device detection system and a detection calibration method, which are widely applied to the technical field of standard device detection. The system comprises a fluid circulation unit, a measurement and control unit, a backflow unit, a detection area and a detection branch unit, a main detection pipeline is arranged in the detection area, the main detection pipeline in the detection area is provided with a plurality of instrument mounting positions and supports parallel detection of a plurality of detected flowmeters, the detection branch unit comprises a plurality of detection branches with different nominal calibers, and branch assemblies are matched with the calibers; the measurement and control unit comprises a PLC, a data acquisition module and an upper computer, the upper computer is integrated with a multifunctional module, and parameter configuration, qualification judgment, coefficient correction and data traceability are achieved. According to the invention, multi-caliber branches are adapted to multi-specification instruments, multi-instrument parallel detection improves efficiency, temperature and pressure compensation guarantees precision, and automatic control and data traceability meet standardized requirements.

Description

Technical Field

[0001] This application relates to the field of standard device testing technology, and more specifically, to a liquid flow standard device testing system and testing calibration method. Background Technology

[0002] A liquid flow standard device is a standard metrological device used for the verification, calibration, testing, and value transfer of liquid flow meters. It determines whether the flow meter is qualified by comparing its measurement results with the device's own standard flow value. As a key tool for ensuring accurate liquid flow measurement and achieving traceability, liquid flow standard devices are widely used in instrument manufacturing, metrological testing, and industrial fluid measurement.

[0003] In practical use, traditional liquid flow rate standard devices have the following problems: 1. Poor pipeline adaptability: They mostly use fixed single nominal diameter testing pipelines, which cannot be compatible with the calibration of multiple flow meters. Switching between diameters requires disassembling and modifying the pipeline, resulting in insufficient device versatility. 2. Low testing efficiency: They generally do not support the simultaneous parallel calibration of multiple flow meters, and batch testing takes a long time. 3. Low level of automation: Flow path switching, flow adjustment, and data judgment mostly rely on manual operation, which not only easily introduces human error but also fails to achieve flexible automatic re-inspection. Summary of the Invention

[0004] To address the aforementioned problems, the present invention provides a liquid flow rate standard device detection system, comprising a fluid circulation unit, a measurement and control unit, and a reflux unit. The measurement and control unit includes a PLC controller and a data acquisition module, with the PLC controller electrically connected to the fluid circulation unit and the data acquisition module electrically connected to the PLC controller. The system also includes a detection area and detection branch units. The detection area contains a main detection pipeline connected to the outlet of the fluid circulation unit. The main detection pipeline has multiple instrument mounting positions, simultaneously fixing at least two flow meters to be tested. All flow meters are connected in series on the main detection pipeline, and each flow meter under test is connected to the data acquisition module. The detection branch unit includes at least two detection branches with different diameters and independent on / off states. The inlet of each detection branch is connected to the outlet of the main detection pipeline. Each detection branch is connected in series with a flow control valve and a standard flow meter along the fluid flow direction. The flow control valve is electrically connected to the PLC controller, and the standard flow meter is connected to the data acquisition module. The inlet of the reflux unit is connected to the outlet of the detection branch unit, and the outlet of the reflux unit is connected to the fluid circulation unit.

[0005] Preferably, the measurement and control unit also includes a host computer with a visual interactive interface. The host computer is connected to the PLC controller and is configured to send control commands to the PLC controller to switch the flow control valve of any detection branch, so as to realize parallel detection of multiple instruments or individual re-inspection of a single instrument.

[0006] Preferably, the detection branch unit includes multiple detection branches with different nominal diameters, and the flow control valves and standard flow meters of each detection branch are matched with the diameter of the corresponding detection branch.

[0007] Preferably, each detection branch is also equipped with a manual valve and a union structure connected in series.

[0008] Preferably, a water distributor is provided between the outlet of the main detection pipeline and the inlet of the detection branch unit to distribute the fluid output from the main detection pipeline to detection branches of different diameters.

[0009] Preferably, each detection branch is also equipped with an observation window connected in series.

[0010] Preferably, the fluid circulation unit includes a water tank, a water pump, and a pressure stabilizing tank. The inlet of the water pump is connected to the outlet of the water tank, and the outlet of the water pump is connected to the inlet of the pressure stabilizing tank. The outlet of the pressure stabilizing tank is connected to the inlet of the main detection pipeline, and the inlet of the water tank is connected to the outlet of the detection branch unit.

[0011] Preferably, the host computer's visual interactive interface integrates a calibration parameter setting module, a non-conforming screening marking module, a new coefficient generation module, and a data archiving and traceability module; The calibration parameter setting module includes a flow point setting submodule and a verification procedure adaptation submodule, which are used to automatically generate a sequence of test points based on the range of the flow meter under test and automatically call the corresponding metrological verification procedure. The non-conforming screening and marking module is used to determine the threshold of the metering performance indicators of the flow meter under test, and to mark the non-conforming instrument and the reason for non-conformity. The new coefficient generation module is used to calculate the correction coefficient of the flow meter under test based on the test results and write the correction coefficient into the flow meter under test. The data archiving and traceability module includes a historical data retrieval submodule, which is used to perform multi-condition retrieval by the inspected flowmeter number, inspection time, and diameter specification.

[0012] Preferably, the measurement and control unit also includes a pressure sensor and a temperature sensor. The pressure sensor is located at the outlet of the fluid circulation unit, and the temperature sensor is located at the inlet of the detection area. Both are connected to the data acquisition module. The host computer compensates and corrects the flow detection value based on the pressure and temperature data.

[0013] The present invention also provides a method for calibrating a liquid flow rate standard device, which is implemented using the above-mentioned liquid flow rate standard device detection system and includes the following steps: S1. System initialization and pipeline preparation: The basic information of the flow meter under test is entered and the calibration parameters are configured through the host computer. The PLC controller starts the fluid circulation unit. After the fluid pressure stabilizes, the flow control valves of different detection branches are switched to select the corresponding diameter detection flow path, so that the fluid flows through the main detection pipeline, the water distributor and the corresponding detection branch in sequence. The pipeline is emptied after the preset circulation time. S2. Flow calibration test: According to the test requirements, multiple instruments can be tested in parallel or calibrated instruments can be retested individually. The host computer sends a flow control command, and the PLC controller adjusts the opening of the flow control valve of the corresponding test branch to the preset flow. The data acquisition module simultaneously collects the indicated flow value of the flow meter under test in the main test pipeline and the reference flow value of the standard flow meter in the corresponding branch. If necessary, the host computer compensates and corrects the flow test value based on pressure and temperature data. S3. Qualification judgment and coefficient correction: The host computer calculates the metrological performance index of the flow meter under test based on the collected flow data, compares it with the preset verification threshold to complete the qualification judgment, and marks the unqualified instruments and the reasons; for the flow meter under test whose re-inspection error exceeds the preset range, the correction coefficient is calculated and written into the flow meter under test. S4. Data Archiving and Traceability: The host computer stores the original detection data, calculation results, judgment conclusions and correction information to the database, automatically generates original records related to the verification, and supports multi-condition retrieval and traceability.

[0014] The beneficial effects of this invention are as follows: 1. The detection branch unit includes multiple detection branches with different nominal diameters. The flow control valves and standard flow meters of each branch are matched with the branch diameter. Combined with the directional fluid distribution function of the water distributor, it can adapt to the detection needs of different specifications of flow meters under test, with a wide range of adaptability and strong compatibility. The main detection pipeline is equipped with multiple instrument installation positions, supporting the synchronous series installation of at least two flow meters under test. It can realize parallel detection of multiple instruments, and can also complete the individual re-inspection of a single instrument by switching branches. There is no need to disassemble and modify the system pipeline, ensuring the convenience of detection operation and the diversity of detection modes, and improving the automation level and flexibility of the system. Compared with the traditional single-unit detection, the multi-instrument parallel detection mode shortens the detection cycle and improves the efficiency of batch detection.

[0015] 2. Through the coordinated control of the host computer and PLC controller, automatic switching of detection branches and precise flow regulation can be realized, eliminating the need for manual valve operation, improving ease of operation and reducing the intensity of manual operation.

[0016] 3. The host computer integrates modules such as calibration parameter setting, non-conforming screening marking, new coefficient generation, and data archiving and traceability. It has a high degree of intelligence, realizes full automation of the testing process, and meets the needs of standardized and regulated metrological verification management. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Enlarged schematic diagram of the detection branch unit; Figure 3 This is a schematic diagram of the process of the present invention.

[0019] Symbols in the diagram: 1. Standard flow meter; 2. Main detection pipeline; 3. Detection branch; 4. Flow control valve; 5. Manual valve; 6. Observation window; 7. Pressure stabilizing tank. Detailed Implementation

[0020] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0021] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0022] It should be noted that the terms "primary" and "secondary" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "primary" or "secondary" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0023] The present application will now describe a liquid flow standard device detection system provided in the embodiments of this application.

[0024] Please see Figure 1 and Figure 2 The liquid flow standard device detection system includes a fluid circulation unit, a measurement and control unit, and a reflux unit. The fluid circulation unit provides a stable pressure circulating fluid for the system. The measurement and control unit includes a PLC controller and a data acquisition module. The PLC controller is electrically connected to the fluid circulation unit, and the data acquisition module is electrically connected to the PLC controller, used to realize the automatic control, flow data acquisition, and processing of the system. This detection system also includes a detection area and a detection branch unit. The detection area has a main detection pipeline 2, which is connected to the outlet of the fluid circulation unit. The main detection pipeline 2 has multiple instrument mounting positions, which can simultaneously fix at least two flow meters under test. Each flow meter under test is connected in series on the main detection pipeline 2, and each flow meter under test is signal-connected to the data acquisition module. The detection branch unit includes at least two detection branches 3 with different diameters and independent on / off capabilities, which are adapted to different specifications of instruments for detection. The inlet of each detection branch 3 is connected to the outlet of the main detection pipeline 2. Each detection branch 3 is connected in series with a flow control valve 4 and a standard flow meter 1 along the fluid flow direction. The flow control valve 4 is electrically connected to the PLC controller to realize the on / off control and flow regulation of the corresponding detection branch 3. The standard flow meter 1 is connected to the data acquisition module to provide flow detection reference data. In this detection system, the outlet of the fluid circulation unit is connected to the main detection pipeline 2 of the detection area. The outlet of the main detection pipeline 2 is connected to the inlet of each detection branch 3 of the detection branch unit. The outlet of the detection branch unit is connected to the inlet of the return unit. The outlet of the return unit is connected back to the fluid circulation unit, forming a closed-loop fluid circulation path. Specifically, this testing system meets the testing requirements of flow meters of different specifications by switching the corresponding diameter testing branch 3, and at the same time realizes the parallel testing of multiple flow meters under test through the main testing pipeline 2, which has high testing efficiency, wide applicability and stable testing accuracy.

[0025] Specifically, the measurement and control unit also includes a host computer with a visual interactive interface. The host computer is communicatively connected to the PLC controller. The host computer is configured to receive operation commands through the visual interactive interface and send control commands to the PLC controller to switch the flow control valve 4 of any detection branch 3, realizing parallel detection of multiple instruments or individual re-inspection of a single instrument. Through the coordinated control of the host computer and the PLC controller, the detection branch 3 and detection mode can be flexibly switched without manual valve adjustment. It can achieve synchronous parallel detection of multiple flow meters under test through the main detection pipeline 2, improving detection efficiency, and can also select a branch to complete the accurate re-inspection of a single instrument, ensuring the convenience of detection operation and the diversity of detection modes, and improving the automation level and flexibility of the system.

[0026] Furthermore, the detection branch unit includes multiple detection branches 3 with different nominal diameters. The flow control valve 4 and standard flow meter 1 of each detection branch 3 are matched with the diameter of the corresponding detection branch 3. By using multiple detection branches 3 with different nominal diameters, the detection requirements of different specifications of flow meters under test can be accommodated. The matching of each branch component with its diameter ensures detection accuracy and adaptability. In this embodiment, the flow control valve 4 of each detection branch 3 is a pneumatic valve.

[0027] Specifically, each detection branch 3 is also equipped with a manual valve 5 and a union structure in series. The manual valve 5 and the union structure are located between the flow control valve 4 and the standard flow meter 1. The manual valve 5 is used for manual on / off control of the detection branch 3. The dual control of the manual valve 5 and the pneumatic valve improves the safety and flexibility of operation. The union structure facilitates the quick disassembly and repair of the detection branch 3, improving the convenience of maintenance.

[0028] When it is necessary to test the flow rate of a certain diameter, the pneumatic valve of the corresponding diameter test branch 3 is opened by the host computer or PLC controller. The fluid enters the test branch 3 from the main test pipeline 2, flows through the pneumatic valve, the manual valve 5 and the standard flow meter 1 in sequence, and after the flow rate benchmark test is completed, it enters the return unit through the confluence, realizing the test process of the corresponding diameter.

[0029] Specifically, a water distributor is provided between the outlet of the main detection pipeline 2 and the inlet of the detection branch unit to distribute the fluid output from the main detection pipeline 2 to the detection branches 3 of different diameters. This enables independent switching and use of the detection branches 3 of different diameters and avoids detection errors caused by uneven flow distribution.

[0030] Specifically, each detection branch 3 is also equipped with an observation window 6 connected in series to visually observe the fluid state inside the pipeline and determine whether there are abnormalities such as bubbles.

[0031] In this embodiment, the detection branch unit includes detection branches 3 with different nominal diameters such as DN50, DN40, DN25, DN20, and DN10. Each detection branch 3 is connected in series with a pneumatic valve, a union structure, a manual valve 5, a standard flow meter 1, and an observation window 6 that match the corresponding branch diameter.

[0032] Specifically, the fluid circulation unit includes a water tank, a water pump, and a pressure stabilizing tank 7. The inlet of the water pump is connected to the outlet of the water tank, and the outlet of the water pump is connected to the inlet of the pressure stabilizing tank 7. The outlet of the pressure stabilizing tank 7 is connected to the inlet of the main detection pipeline 2, and the inlet of the water tank is connected to the outlet of the detection branch unit, forming a closed-loop fluid circulation path. The water tank is used to store the detection fluid, the water pump provides power for the circulation of the entire system, and the pressure stabilizing tank 7 is used to eliminate fluid pulsation and stabilize the output fluid pressure, providing a detection medium with uniform pressure and stable flow field for flow detection. This closed-loop circulation structure enables the reuse of the detection fluid, saving fluid medium. At the same time, the pressure stabilizing tank 7 can ensure the stability of the fluid pressure during the detection process, avoiding distortion of flow detection data due to pressure fluctuations, and improving the detection accuracy and operational stability of the system.

[0033] Furthermore, the host computer's visual interactive interface integrates a calibration parameter setting module, a non-conforming screening mark module, a new coefficient generation module, and a data archiving and traceability module. Each functional module works collaboratively and maintains communication with the PLC controller. The calibration parameter setting module includes a flow point setting submodule and a verification procedure adaptation submodule, which are used to automatically generate a sequence of test points based on the range of the flow meter under test and automatically call the corresponding metrological verification procedure. The non-conforming screening and marking module is used to determine the threshold of the metering performance indicators of the flow meter under test, and to mark the non-conforming instrument and the reason for non-conformity. The new coefficient generation module is used to calculate the correction coefficient of the flow meter under test based on the test results and write the correction coefficient into the flow meter under test. The data archiving and traceability module includes a historical data retrieval submodule, which is used to perform multi-condition retrieval by the inspected flowmeter number, inspection time, and diameter specification.

[0034] Furthermore, the working process of the host computer is as follows: the test parameters are configured through the calibration parameter setting module, the host computer sends the instructions to the PLC controller to execute the test, the unqualified screening and marking module completes the automatic judgment after the test is completed, the instruments that need to be corrected are written with the corresponding coefficients through the new coefficient generation module, and all test data and results are stored through the data archiving and traceability module, and historical data can be retrieved at any time through multi-condition retrieval.

[0035] Furthermore, the measurement and control unit also includes a pressure sensor and a temperature sensor. The pressure sensor is located at the outlet of the fluid circulation unit, and the temperature sensor is located at the inlet of the detection area. Both are connected to the data acquisition module. The pressure sensor monitors the pressure parameters of the fluid output by the fluid circulation unit, and the temperature sensor monitors the temperature parameters of the fluid flowing into the detection area. The host computer can compensate and correct the flow detection value based on the collected pressure and temperature data to eliminate the deviation caused by temperature and pressure changes in the flow detection results, so that the detection results meet the accuracy requirements of metrological verification.

[0036] Please see Figure 3 The present invention also provides a method for calibrating and testing a liquid flow standard device, which is implemented using the above-mentioned liquid flow standard device testing system. This method can automate the calibration, testing, judgment, correction, and data traceability of the flow meter under test, and includes the following steps: S1. System initialization and pipeline preparation: The basic information of the flow meter under test is entered and the calibration parameters are configured through the host computer. The PLC controller starts the fluid circulation unit. After the fluid pressure stabilizes, the flow control valves of different detection branches are switched to select the corresponding diameter detection flow path, so that the fluid flows through the main detection pipeline, the water distributor and the corresponding detection branch in sequence. The pipeline is emptied after the preset circulation time. S2. Flow Calibration Test: Based on the test requirements, select the parallel test mode of multiple instruments or the individual retest mode of calibrated instruments. Send flow control command through the host computer, and the PLC controller adjusts the opening of the flow control valve of the corresponding test branch to the preset flow. The data acquisition module simultaneously collects the indicated flow value of the flow meter under test in the main test pipeline and the reference flow value of the standard flow meter in the corresponding branch. At the same time, combined with the fluid temperature and pressure data collected by the pressure sensor and temperature sensor, the host computer compensates and corrects the flow test value to ensure the accuracy and reliability of the test data. S3. Qualification judgment and coefficient correction: The host computer calculates the metrological performance index of the flow meter under test based on the collected flow data, compares the calculation result with the preset verification threshold to complete the qualification judgment, and marks the unqualified instruments and the reasons; for the flow meter under test whose re-inspection error exceeds the preset range, the correction coefficient is calculated and written into the flow meter under test. S4. Data Archiving and Traceability: The host computer stores the original detection data, calculation results, judgment conclusions and correction information to the database, automatically generates original records related to the verification, and supports multi-condition retrieval and traceability.

[0037] This testing and calibration method relies on the system's automated control and data processing capabilities to achieve intelligent operation of the entire flowmeter testing and calibration process. It can significantly improve testing efficiency through parallel testing of multiple instruments, and ensure the testing accuracy of a single instrument through individual retesting. Combined with temperature and pressure compensation correction, it further optimizes the accuracy of test results. At the same time, it improves the data archiving and traceability function, meeting the needs of automated, accurate and standardized use in metrological verification.

[0038] The working process of this invention is as follows: After startup, the PLC controller controls the water pump to run. The water pump pressurizes the fluid medium in the water tank and delivers it to the pressure stabilizing tank. After the pressure stabilizing tank performs pressure stabilization and anti-pulsation treatment on the fluid, it delivers the pressure-stabilized fluid to the main detection pipeline in the detection area. The operator enters the basic information of the flow meter under test, completes the calibration parameter configuration, and selects the detection branch with the appropriate diameter through the host computer. The PLC controller switches the flow control valve of the corresponding detection branch according to the host computer instruction. After the fluid flows through multiple flow meters under test on the main detection pipeline in sequence, it is directionally distributed to the target detection branch by the water distributor, and then flows through the standard flow meter of the branch to complete the flow benchmark detection. Finally, it flows back to the water tank through the return unit to form a closed-loop fluid circulation. The data acquisition module synchronously collects the indicated flow rate data of the flow meter under test and the reference flow rate data of the standard flow meter, and uploads all kinds of data to the host computer. The host computer calculates the metrological performance index of the flow meter under test and compares it with the preset verification threshold to complete the qualification judgment. For instruments that exceed the tolerance during re-inspection, the module calculates and writes the correction coefficient. At the same time, the original test data, judgment results and correction information are stored in the database to realize data archiving and traceability, and complete all test calibration operations.

[0039] The specific embodiments described above do not cover the entire scope of protection of this application. Modifications or equivalent substitutions to the invention should all fall within the patent coverage requirements of this application. In this invention, the above-described embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A liquid flow rate standard device detection system, comprising a fluid circulation unit, a measurement and control unit, and a reflux unit; the measurement and control unit includes a PLC controller and a data acquisition module, the PLC controller being electrically connected to the fluid circulation unit, and the data acquisition module being electrically connected to the PLC controller; characterized in that: It also includes a detection area and detection branch units. The detection area has a main detection pipeline connected to the outlet of the fluid circulation unit. The main detection pipeline has multiple instrument mounting positions, and at least two flow meters under test are fixed thereon. Each flow meter under test is connected in series on the main detection pipeline and is connected to the data acquisition module. The detection branch unit includes at least two detection branches with different diameters and independent on / off connections. The inlet of each detection branch is connected to the outlet of the main detection pipeline. Each detection branch has a flow control valve and a standard flow meter connected in series along the fluid flow direction. The flow control valve is electrically connected to the PLC controller, and the standard flow meter is connected to the data acquisition module. The inlet of the reflux unit is connected to the outlet of the detection branch unit, and the outlet of the reflux unit is connected to the fluid circulation unit.

2. The liquid flow rate standard device detection system as described in claim 1, characterized in that: The measurement and control unit also includes a host computer with a visual interactive interface. The host computer is communicatively connected to the PLC controller. The host computer is configured to send control commands to the PLC controller to switch the flow control valve of any of the detection branches, so as to realize parallel detection of multiple instruments or individual re-inspection of a single instrument.

3. The liquid flow rate standard device detection system as described in claim 1, characterized in that: The detection branch unit includes multiple detection branches with different nominal diameters, and the flow control valves and standard flow meters of each detection branch are matched with the diameter of the corresponding detection branch.

4. The liquid flow rate standard device detection system as described in claim 1, characterized in that: Each of the aforementioned detection branches is also equipped with a manual valve and a union structure connected in series.

5. The liquid flow rate standard device detection system as described in claim 1, characterized in that: A water distributor is provided between the outlet of the main detection pipeline and the inlet of the detection branch unit to distribute the fluid output from the main detection pipeline to the detection branches of different diameters.

6. The liquid flow rate standard device detection system as described in claim 1, characterized in that: Each of the aforementioned detection branches is also connected in series with an observation window.

7. The liquid flow rate standard device detection system as described in claim 1, characterized in that: The fluid circulation unit includes a water tank, a water pump, and a pressure stabilizing tank. The inlet of the water pump is connected to the outlet of the water tank, and the outlet of the water pump is connected to the inlet of the pressure stabilizing tank. The outlet of the pressure stabilizing tank is connected to the inlet of the main detection pipeline, and the inlet of the water tank is connected to the outlet of the detection branch unit.

8. The liquid flow rate standard device detection system as described in claim 2, characterized in that: The host computer's visual interactive interface integrates a calibration parameter setting module, a non-conforming screening and marking module, a new coefficient generation module, and a data archiving and traceability module. The calibration parameter setting module includes a flow point setting submodule and a verification procedure adaptation submodule, which are used to automatically generate a sequence of test points according to the range of the flow meter under test and automatically call the corresponding metrological verification procedure. The non-conforming screening and marking module is used to determine the threshold of the metering performance indicators of the flow meter under test, and to mark the non-conforming instrument and the reason for non-conformity. The new coefficient generation module is used to calculate the correction coefficient of the flow meter under test based on the detection results, and write the correction coefficient into the flow meter under test; The data archiving and traceability module includes a historical data retrieval submodule, which is used to perform multi-condition retrieval based on the inspected flowmeter number, inspection time, and caliber specification.

9. A liquid flow rate standard device detection system as described in claim 2 or 8, characterized in that: The measurement and control unit also includes a pressure sensor and a temperature sensor. The pressure sensor is located at the outlet of the fluid circulation unit, and the temperature sensor is located at the inlet of the detection area. Both are connected to the data acquisition module. The host computer compensates and corrects the flow detection value based on the pressure and temperature data.

10. A method for calibrating a liquid flow rate standard device, implemented using the liquid flow rate standard device detection system according to any one of claims 1-9, characterized in that, Includes the following steps: S1. System initialization and pipeline preparation: The basic information of the flow meter under test is entered and the calibration parameters are configured through the host computer. The PLC controller starts the fluid circulation unit. After the fluid pressure stabilizes, the flow control valves of different detection branches are switched to select the corresponding diameter detection flow path, so that the fluid flows through the main detection pipeline, the water distributor and the corresponding detection branch in sequence. The pipeline is emptied after the preset circulation time. S2. Flow calibration test: According to the test requirements, multiple instruments can be tested in parallel or calibrated instruments can be retested individually. The host computer sends a flow control command, and the PLC controller adjusts the opening of the flow control valve of the corresponding test branch to the preset flow. The data acquisition module simultaneously collects the indicated flow value of the flow meter under test in the main test pipeline and the reference flow value of the standard flow meter in the corresponding branch. The host computer compensates and corrects the flow test value based on pressure and temperature data. S3. Qualification judgment and coefficient correction: The host computer calculates the metrological performance index of the flow meter under test based on the collected flow data, compares it with the preset verification threshold to complete the qualification judgment, and marks unqualified instruments and the reasons. For flow meters under test whose retesting error exceeds the preset range, calculate the correction coefficient and write it into the flow meter under test; S4. Data Archiving and Traceability: The host computer stores the original detection data, calculation results, judgment conclusions and correction information to the database, automatically generates original records related to the verification, and supports multi-condition retrieval and traceability.

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