Apparatus, system and method for measuring crack depth in a pressure pipe based on potential method

Abstract

The application relates to a kind of measuring device, system and method of pressure pipeline crack depth based on potential method, belong to pressure pipeline technical field, power module is electrified to the pressure pipeline to be measured, voltage signal acquisition module collects the input voltage of the pressure pipeline to be measured and the output voltage of each measuring point arranged around crack on the pressure pipeline to be measured, data calculation module determines the depth of crack on the pressure pipeline to be measured according to input voltage and multiple output voltages.Power module, voltage signal acquisition module and data calculation module are all encapsulated in explosion-proof housing, and the pressure pipeline to be measured is electrified, which overcomes the low energy consumption, explosion-proof, portable problems faced by potential method in actual engineering application, and realizes accurate, simple and convenient measurement of the depth of crack on the pressure pipeline based on potential method.

Description

Technical Field

[0001] This invention relates to the field of pressure pipeline technology, and in particular to a device, system and method for measuring the crack depth of pressure pipelines based on the potentiometric method. Background Technology

[0002] Pressure pipelines are specialized equipment widely used in chemical, nuclear power, mining, and municipal pipeline industries. Pipeline transportation is the safest and most cost-effective form of energy transport. Therefore, pressure pipelines are a vital component of economic development and a core lifeline of the national economy. Currently, many pressure pipelines are entering a period of increased accident risk as their service life increases. Due to factors such as corrosion, aging, and pipeline deformation, cracks and defects can develop. If these cracks and defects are not controlled, they can lead to leaks and perforations, resulting in significant loss of life and property. Therefore, the rational use of effective monitoring methods to accurately monitor the propagation of cracks and defects in pressure pipelines and to accurately assess their safety is of great practical significance for eliminating potential hazards and preventing safety accidents. The media transported by in-service chemical and petrochemical pressure pipelines often have flammable, explosive, or toxic properties; ensuring that these media do not leak is a prerequisite for the safe operation of pressure pipelines.

[0003] Pipe crack depth is the most direct measure of the extent of pipeline damage, and its measurement results directly reflect the reliability of the pipeline. Accurate, rapid, and convenient measurement of pipeline crack depth is a crucial technology.

[0004] There are many methods for defect detection in metallic materials, the most commonly used being direct microscopic observation, penetrant testing, X-ray testing, acoustic emission testing, ultrasonic testing, eddy current testing, magnetic particle testing, compliance testing, and potentiometric methods. Among these, the potentiometric method, which uses the conductivity of the metallic specimen itself to detect crack depth, is relatively simple, accurate, and safe compared to other methods. Furthermore, it can be used in complex and variable environments such as high temperature, high pressure, and corrosion, making it one of the main methods for monitoring crack propagation under extreme conditions.

[0005] However, potentiometry is mainly used in laboratories to monitor crack depth under conditions such as high temperature, high pressure, corrosion, and radiation. In actual production, it is used to infer artificial fracturing parameters in the Zhijin coalbed methane block, monitor the stability of high-bed embankment slopes, dynamically monitor oilfield reservoir distribution, and monitor bridge cracks. However, due to challenges in practical engineering applications such as low energy consumption, explosion-proof features, and portability, there has been no evidence of applying potentiometry technology to monitor defect propagation in industrial pipelines. Summary of the Invention

[0006] The purpose of this invention is to provide a device, system, and method for measuring the crack depth of pressure pipelines based on the potentiometric method, so as to accurately and conveniently measure the crack depth of pressure pipelines based on the potentiometric method.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] A device for measuring the crack depth of a pressure pipeline based on the potentiometric method, the device comprising: a power supply module, a voltage signal acquisition module, a data calculation module, and an explosion-proof housing;

[0009] The power module, the voltage signal acquisition module, and the data calculation module are all encapsulated inside the explosion-proof enclosure;

[0010] The power module is connected to the pipeline under test, and the power module is used to supply power to the pipeline under test.

[0011] The voltage signal acquisition module is used to acquire the output voltage at a pair of specified measuring points around the crack on the pressure-under-test pipeline.

[0012] The data calculation module is connected to the voltage signal acquisition module and is used to receive the output voltage acquired by the voltage signal acquisition module, and determine the depth of the crack on the pressure pipeline under test according to the ratio of the output voltage and the initial voltage; the initial voltage is the voltage first measured at the pair of measuring points when the pressure pipeline under test returns to normal working state.

[0013] In an optional embodiment, the power module includes a battery pack and a DC power module; the battery pack is connected to the input terminal of the DC power module, the positive output of the DC power module is connected to the current input point of the pressure pipe under test, and the negative output of the DC power module is connected to the current output point of the pressure pipe under test.

[0014] In an optional embodiment, the measuring device further includes: an amplifier and a digital-to-analog converter;

[0015] Both the amplifier and the digital-to-analog converter are encapsulated inside the explosion-proof housing;

[0016] The input terminal of the amplifier is connected to the output terminal of the voltage signal acquisition module, and the output terminal of the amplifier is connected to the input terminal of the digital-to-analog converter. The amplifier is used to amplify the output voltage to obtain an amplified analog output voltage signal.

[0017] The output terminal of the digital-to-analog converter is connected to the data calculation module. The digital-to-analog converter is used to convert the amplified output voltage analog signal into an output voltage digital signal and transmit the output voltage digital signal to the data calculation module.

[0018] In an optional embodiment, the measuring device further includes: a liquid crystal display module and a data transmission module;

[0019] The data transmission module is encapsulated inside the explosion-proof enclosure, and the liquid crystal display module is disposed on the explosion-proof enclosure;

[0020] The output of the data calculation module is connected to the liquid crystal display module and the data transmission module, respectively.

[0021] The liquid crystal display module is used to display the output voltage and the depth of the crack on the pressure-to-be-tested pipeline determined by the data calculation module;

[0022] The data transmission module is used to transmit the depth of the crack on the pressure pipeline under test, determined by the data calculation module, to the mobile terminal.

[0023] In an optional configuration, the data calculation module determines the depth of the crack in the pressure-testing pipeline based on the following function model:

[0024]

[0025] Where 'a' represents the crack depth and 't' represents the pipe thickness. This represents the ratio of crack depth to pipe thickness, i.e., a measure of crack depth; V represents the output voltage corresponding to the ratio, and V0 represents the initial voltage. This indicates the voltage ratio.

[0026] A method for measuring the crack depth in a pressure pipeline based on the potentiometric method, the method comprising:

[0027] A current input point and a current output point are arranged in the test area of ​​the pressure pipeline to be tested, and a pair of measuring points are arranged on the pressure pipeline to be tested circumferentially at the location of the crack; the pair of measuring points are symmetrically arranged on both sides of the crack.

[0028] The pressure pipeline under test is energized through the current input point and the current output point, and the initial voltage and the output voltage of the pair of measuring points at the time point under test are measured; the initial voltage is the voltage first measured at the pair of measuring points when the pressure pipeline under test returns to normal working state.

[0029] The depth of the crack in the pressure pipeline under test is determined by the ratio of the output voltage of a pair of measuring points at the time point to be measured to the initial voltage.

[0030] In the optional scheme, determining the depth of the crack in the pressure pipeline under test based on the ratio of the output voltage to the initial voltage of a pair of measuring points at the time point to be measured includes:

[0031] Measure the output voltage of the pair of measuring points at the time point to be measured;

[0032] Obtain the ratio of the output voltage to the initial voltage at the pair of measuring points;

[0033] Based on the stated ratio, a functional model relating the voltage ratio to the crack depth characterization quantity is used. Determine the depth of the crack in the pressure pipeline under test;

[0034] Where 'a' represents the crack depth and 't' represents the pipe thickness. This represents the ratio of crack depth to pipe thickness, i.e., a measure of crack depth; V represents the output voltage corresponding to the ratio, and V0 represents the initial voltage. This indicates the voltage ratio.

[0035] In an optional approach, the functional model between the voltage ratio and the crack depth characterization quantity is determined as follows:

[0036] Create a pipe model with cracks and preset multiple crack depths;

[0037] A current input point and a current output point are set; the current input point and the current output point are along the axial direction of the pipe to be tested and pass through the crack, and the current input point and the current output point are symmetrically distributed on the pipe on both sides of the crack.

[0038] A pair of measuring points are arranged; the two measuring points in the pair are symmetrical about the crack center.

[0039] A low voltage is applied to the current input point and the current output point, and the voltage at the pair of measuring points is measured at each crack depth;

[0040] Use the voltage at the measuring point corresponding to the minimum crack depth as the initial voltage;

[0041] Based on multiple crack depths, initial voltages, and the voltages at each pair of measuring points at each crack depth, a curve is determined between the voltage ratio and the crack depth characterization; the voltage ratio is the ratio of the output voltage of the measuring point to the initial voltage.

[0042] Based on the curve, a numerical simulation method is used to fit the curve and obtain a functional model between the voltage ratio and the crack depth characterization.

[0043] A pressure pipeline crack depth measurement system based on potentiometric method, the measurement system comprising: a computer, a cloud server, and the aforementioned pressure pipeline crack depth measurement device based on potentiometric method;

[0044] The computer's input terminal is connected to the pressure pipeline crack depth measuring device based on the potentiometric method, and the computer's output terminal is connected to a cloud server; the computer is used to receive the crack depth on the pressure pipeline under test determined by the pressure pipeline crack depth measuring device based on the potentiometric method, and transmit it to the cloud server.

[0045] The cloud server is used to issue an alarm when the depth of the crack on the pressure pipeline under test is greater than the critical length value, and to determine that the crack is in an expanding state when the current value of the crack depth on the pressure pipeline under test is greater than the previous measurement value.

[0046] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0047] This invention discloses a device, system, and method for measuring the crack depth of pressure pipelines based on the potentiometric method. A power supply module energizes the pressure pipeline under test with a low voltage. A voltage signal acquisition module acquires the output voltage at a pair of designated measuring points around the crack on the pressure pipeline. A data calculation module determines the crack depth on the pressure pipeline based on the output voltage. The power supply module, voltage signal acquisition module, and data calculation module are all encapsulated in an explosion-proof housing, and the pressure pipeline under test is energized with a low voltage. This overcomes the low energy consumption, explosion-proof, and portability issues faced by the potentiometric method in practical engineering applications, achieving accurate and convenient measurement of crack depth on pressure pipelines based on the potentiometric method. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0049] Figure 1 A schematic diagram of the structure of the pressure pipeline crack depth measurement device and measurement system based on the potential method provided by the present invention;

[0050] Figure 2 A schematic diagram of the information processing principle of the pressure pipeline crack depth measurement system based on the potential method provided by the present invention;

[0051] Figure 3 A schematic diagram of the data processing principle of the remote server in the pressure pipeline crack depth measurement system based on the potential method provided by the present invention;

[0052] Figure 4 A flowchart of the pressure pipeline crack depth measurement method based on the potential method provided by the present invention;

[0053] Figure 5 The SW model of the pressure pipeline provided in the embodiments of the present invention;

[0054] Figure 6 A plan view of the measuring point layout provided in an embodiment of the present invention; Figure 6 (a) is a cross-sectional view showing the arrangement of measuring points along the plane where the crack is located. Figure 6 (b) is a plan view of the layout of the measuring points;

[0055] Figure 7 The graph shows the relationship between the voltage ratio at the measuring point and the crack length characterization when the current input and output positions are X and X', as provided in the embodiments of the present invention. Detailed Implementation

[0056] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] The purpose of this invention is to provide a device, system, and method for measuring the crack depth of pressure pipelines based on the potentiometric method, so as to accurately and conveniently measure the crack depth of pressure pipelines based on the potentiometric method.

[0058] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0059] This invention provides a device for measuring the crack depth of pressure pipelines based on the potentiometric method, such as... Figure 1 As shown, the measuring device includes: a power supply module, a voltage signal acquisition module, a data calculation module, and an explosion-proof enclosure.

[0060] The power supply module, voltage signal acquisition module, and data calculation module are all encapsulated inside an explosion-proof enclosure. The power supply module is connected to the pressure pipeline under test and supplies power to the pipeline. The voltage signal acquisition module is used to acquire the output voltage at a pair of specified measuring points around the crack on the pressure pipeline under test. The data calculation module is connected to the voltage signal acquisition module and is used to receive the output voltage acquired by the voltage signal acquisition module and determine the depth of the crack on the pressure pipeline under test based on the ratio of the output voltage to the initial voltage. The initial voltage is the voltage first measured at a pair of measuring points when the pressure pipeline under test returns to normal operating conditions.

[0061] The explosion-proof enclosure encapsulates the entire measurement integration system to prevent external forces from damaging the device and causing problems such as poor contact or even short circuits; in particular, it prevents the battery pack from spontaneously combusting or even exploding due to damage.

[0062] The voltage signal acquisition module is a high-precision voltage signal acquisition module. It acquires the output voltage, and the voltage measurement accuracy is required to reach six and a half digits, with an accuracy of nanovolt level.

[0063] The power supply module includes a battery pack and a DC power module. The battery pack is connected to the input terminal of the DC power module, the positive terminal of the DC power module is connected to the current input point of the pressure pipe under test, and the negative terminal of the DC power module is connected to the current output point of the pressure pipe under test.

[0064] The built-in battery pack powers the entire monitoring system, and the app will remind you to charge it when the battery is low. The DC power module is a high-precision DC power module, which controls the magnitude and frequency of the output current.

[0065] To improve the portability of the measurement, the power supply module, voltage signal acquisition module, and data calculation module are integrated together.

[0066] The power of the current source is selected to be around 50W, with an operating current of 100A. Using a low-voltage, high-current method for online inspection of pipelines in actual engineering projects is safer.

[0067] The measuring device also includes an amplifier and a digital-to-analog converter (DAC). Both the amplifier and DAC are enclosed within an explosion-proof enclosure. The amplifier's input is connected to the output of the voltage signal acquisition module, and its output is connected to the input of the DAC. The amplifier amplifies the output voltage to obtain an amplified analog output voltage signal. The DAC's output is connected to the data processing module, which converts the amplified analog output voltage signal into a digital output voltage signal and transmits this digital signal to the data processing module.

[0068] The measuring device also includes an LCD display module and a data transmission module. The data transmission module is enclosed inside an explosion-proof enclosure, while the LCD display module is mounted on the explosion-proof enclosure. The output of the data calculation module is connected to both the LCD display module and the data transmission module. The LCD display module displays the output voltage and the crack depth on the pressure-testing pipeline determined by the data calculation module. The data transmission module transmits the crack depth on the pressure-testing pipeline determined by the data calculation module to a mobile terminal.

[0069] The data calculation module determines the depth of the crack in the pressure pipeline under test based on the following function model:

[0070]

[0071] Where 'a' represents the crack depth and 't' represents the pipe thickness. This represents the ratio of crack depth to pipe thickness, i.e., a measure of crack depth; V represents the output voltage corresponding to the ratio, and V0 represents the initial voltage. This indicates the voltage ratio.

[0072] To prevent safety issues such as accidental short circuits and leakage of power, the testing machine is equipped with a safety module. This module ensures the safety of the measurement by measuring whether the resistance in the power input and output circuit is too low and whether the casing of the testing machine is energized.

[0073] The principle of measuring the resistance in the power input / output circuit is as follows: a voltmeter is connected in parallel in the circuit; if there is a short circuit, the voltage is zero. The "power input / output circuit" is a loop formed between the power supply (specifically, the output terminal of a high-precision DC power module), wires, and pipes.

[0074] The principle for determining whether the casing of the testing machine is electrified is as follows: connect the ammeter, wires, and casing to form a circuit. If there is current in the casing, it can be detected by the ammeter.

[0075] The pressure pipeline crack depth measurement device based on the potentiometric method has self-starting and sleep functions to achieve energy saving; it can automatically adjust the start-up time interval of the device by learning the monitored data to avoid missing monitoring data.

[0076] The test device is highly integrated, small in size, and consumes little energy, making it easy to carry for outdoor testing.

[0077] This invention also provides a system for measuring the crack depth of pressure pipelines based on the potentiometric method, such as... Figure 1 As shown, the measurement system includes: a computer, a cloud server, and the aforementioned device for measuring the crack depth of pressure pipelines based on the potential method.

[0078] The computer's input is connected to a potential-based pressure pipeline crack depth measurement device, and its output is connected to a cloud server. The computer receives the crack depth on the pressure pipeline under test, determined by the potential-based measurement device, and transmits it to the cloud server. The cloud server issues an alarm when the crack depth on the pressure pipeline exceeds a critical length value, and determines that the crack is in an expanding state when the current crack depth is greater than the previous measurement.

[0079] The cloud server carries a safety early warning program. Based on the defect location and size, material properties, allowable stress during pipeline design, and material degradation, the system automatically calculates the critical crack depth and, by applying a certain safety response conservatism coefficient, determines the critical crack size for the pipeline. When the crack size reaches this critical size, the system automatically issues an early warning, increasing the focus of professionals on specific areas. Combined with cloud technology, measurement data is uploaded to the server, ensuring the continuous effectiveness of the detection data. This not only reflects the pipeline's safety status but also the crack propagation status of specific locations within the pipeline.

[0080] The cloud server transmits alarm and crack expansion information to the LCD display module of the testing device for real-time display via computer.

[0081] Reference Figure 2 and Figure 3 The measurement process of the pressure pipeline crack depth measurement system based on the potentiometric method is as follows:

[0082] Step 1: Determine the location of the crack using non-destructive testing.

[0083] Step two, set up the measurement system. Arrange current input / output points and voltage measurement points in the area to be measured. Fix the wires to the pipe by spot welding; the testing machine is a device that integrates a power supply module, an amplifier circuit module, a voltage measurement module, a digital-to-analog converter, and a data transmission module.

[0084] Step 3: Start the testing machine, connect the power supply, and set the power supply current and the frequency of power on / off.

[0085] Step 4: Arrange measuring points around the circumference of the pipe where the crack is located. The closer the measuring points are to the crack, the better the test results. Measure the output voltage value.

[0086] Step five: After taking one measurement, the device enters calculation mode to obtain crack depth information. Once the calculation is complete, the LCD screen displays the result, which is then transmitted to the computer and uploaded to the cloud.

[0087] Step six: The cloud server's security alert program determines whether the crack is in an expanding state based on the crack depth data. Mobile users can obtain information including crack depth and whether the crack is expanding through the cloud server.

[0088] This invention also provides a method for measuring the crack depth of pressure pipelines based on the potentiometric method. This method is applied to the aforementioned device for measuring the crack depth of pressure pipelines based on the potentiometric method, such as... Figure 4 As shown, the measurement methods include:

[0089] Step 101: Arrange current input points and current output points in the test area of ​​the pressure pipeline to be tested, and arrange a pair of measuring points on the pressure pipeline to be tested circumferentially at the location of the crack; the two measuring points in the pair are symmetrically arranged on both sides of the crack.

[0090] Step 102: Energize the pressure pipeline under test through the current input point and the current output point, and measure the initial voltage and the output voltage of a pair of measuring points at the time point to be measured; the initial voltage is the voltage measured at the measuring point for the first time when the pipeline has just returned to normal working state.

[0091] Step 103: Determine the depth of the crack in the pressure pipeline under test based on the ratio of the output voltage to the initial voltage of a pair of measuring points at the time point to be measured.

[0092] In one example, it specifically includes:

[0093] Measure the output voltage of a pair of measuring points at the time point to be measured;

[0094] Obtain the ratio of the output voltage to the initial voltage of a pair of measuring points;

[0095] Based on the ratio, a functional model is used to represent the relationship between the voltage ratio and the crack depth characterization quantity. Determine the depth of the crack in the pressure pipeline under test;

[0096] Where 'a' represents the crack depth and 't' represents the pipe thickness. This represents the ratio of crack depth to pipe thickness, i.e., a measure of crack depth; V represents the output voltage corresponding to the ratio, and V0 represents the initial voltage. It represents a ratio.

[0097] The functional model between the voltage ratio and the crack depth characterization quantity is determined as follows:

[0098] Create a pipe model with cracks and preset multiple crack depths;

[0099] Set current input points and current output points; the current input points and current output points are along the axis of the pipe to be tested and pass through the crack, and the current input points and current output points are symmetrically distributed on the pipe on both sides of the crack.

[0100] Set up a pair of measuring points; the two measuring points in the pair are symmetrical about the crack center.

[0101] A low voltage is applied to the current input point and the current output point, and the voltage at a pair of measuring points is measured at each crack depth.

[0102] Use the voltage at the measuring point corresponding to the minimum crack depth as the initial voltage;

[0103] Based on multiple crack depths, initial voltages, and the voltage at a pair of measuring points at each crack depth, a curve is determined between the voltage ratio and the crack depth characterization quantity; the voltage ratio is the ratio of the output voltage at the measuring point to the initial voltage.

[0104] Based on the curve, a numerical simulation method was used to fit the curve and obtain a functional model between the voltage ratio and the crack depth characterization.

[0105] The following specific example illustrates in detail how to determine the functional model between the voltage ratio and the crack depth characterization.

[0106] Establish a pipeline model containing cracks, such as the SW model of a pressure pipeline. Figure 5 As shown in the diagram, the plan of the measuring point layout is as follows: Figure 6 As shown. Taking crack depth 'a' as 2, 3, 4, 5, 6, 7, and 8 mm, the ratios of crack depth to sample wall thickness are respectively... The current is arranged at points X and X', with an input current of 50A. The potential measurement points are selected as follows: measurement point a is set on the outer wall of the circular tube, and then a symmetrical measurement point a' is set at measurement point a'.

[0107] In the obtained data, Voltage data at measurement points of 0.2 and 0.3 differed significantly from other data and were therefore considered invalid and discarded. When the voltage is equal to 0.4, the voltage between aa' is measured as the initial voltage V0. Calculate V / V0.

[0108] Figure 7 Plot the data based on the current input and output positions X and X'. and Relationship diagram. The fitted numerical equation is as follows:

[0109]

[0110] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A device for measuring the crack depth of a pressure pipeline based on the potentiometric method, characterized in that, The measuring device includes: a power supply module, a voltage signal acquisition module, a data calculation module, and an explosion-proof housing; The power module, the voltage signal acquisition module, and the data calculation module are all encapsulated inside the explosion-proof enclosure; The power module is connected to the pressure-to-be-tested pipeline and is used to supply power to the pressure-to-be-tested pipeline. The power module includes a battery pack and a DC power module. The battery pack is connected to the input terminal of the DC power module, the positive output of the DC power module is connected to the current input point of the pressure-to-be-tested pipeline, and the negative output of the DC power module is connected to the current output point of the pressure-to-be-tested pipeline. The voltage signal acquisition module is used to acquire the output voltage at a pair of specified measuring points around the crack on the pressure-under-test pipeline. The data calculation module is connected to the voltage signal acquisition module and is used to receive the output voltage acquired by the voltage signal acquisition module, and determine the depth of the crack on the pressure pipeline under test according to the ratio of the output voltage and the initial voltage; the initial voltage is the voltage first measured at the pair of measuring points when the pressure pipeline under test returns to normal working state. The measuring device further includes an amplifier and a digital-to-analog converter (DAC); both the amplifier and the DAC are encapsulated inside the explosion-proof housing; the input terminal of the amplifier is connected to the output terminal of the voltage signal acquisition module, and the output terminal of the amplifier is connected to the input terminal of the DAC; the amplifier amplifies the output voltage to obtain an amplified analog output voltage signal; the output terminal of the DAC is connected to the data calculation module; the DAC converts the amplified analog output voltage signal into a digital output voltage signal and transmits the digital output voltage signal to the data calculation module. The measuring device further includes: a liquid crystal display module and a data transmission module; the data transmission module is encapsulated inside the explosion-proof housing, and the liquid crystal display module is disposed on the explosion-proof housing; the output of the data calculation module is connected to the liquid crystal display module and the data transmission module respectively; the liquid crystal display module is used to display the output voltage and the depth of the crack on the pressure pipe under test determined by the data calculation module; the data transmission module is used to transmit the depth of the crack on the pressure pipe under test determined by the data calculation module to a mobile terminal.

2. The pressure pipeline crack depth measurement device based on the potentiometric method according to claim 1, characterized in that, The data calculation module determines the depth of the crack in the pressure-testing pipeline based on the following function model: ； Where 'a' represents the crack depth and 't' represents the pipe thickness. This represents the ratio of crack depth to pipe thickness, i.e., a measure of crack depth; V represents the output voltage corresponding to the ratio. Indicates the initial voltage. This indicates the voltage ratio.

3. A method for measuring the crack depth of a pressure pipeline based on the potentiometric method, utilizing the measuring device described in claim 1 or 2, characterized in that, The measurement method includes: A current input point and a current output point are arranged in the test area of ​​the pressure pipeline to be tested, and a pair of measuring points are arranged on the pressure pipeline to be tested circumferentially at the location of the crack; the pair of measuring points are symmetrically arranged on both sides of the crack. The pressure pipeline under test is energized through the current input point and the current output point, and the initial voltage and the output voltage of the pair of measuring points at the time point under test are measured; the initial voltage is the voltage first measured at the pair of measuring points when the pressure pipeline under test returns to normal working state. The depth of the crack in the pressure pipeline under test is determined by the data calculation module based on the ratio of the output voltage of a pair of measuring points at the time point to be measured to the initial voltage.

4. The method for measuring the crack depth of a pressure pipeline based on the potentiometric method according to claim 3, characterized in that, The method of determining the depth of the crack in the pressure pipeline under test based on the ratio of the output voltage to the initial voltage of a pair of measuring points at the time point to be measured includes: Measure the output voltage of the pair of measuring points at the time point to be measured; Obtain the ratio of the output voltage to the initial voltage at the pair of measuring points; Based on the stated ratio, a functional model relating the voltage ratio to the crack depth characterization quantity is used. Determine the depth of the crack on the pressure pipeline under test; Where 'a' represents the crack depth and 't' represents the pipe thickness. This represents the ratio of crack depth to pipe thickness, i.e., a measure of crack depth; V represents the output voltage corresponding to the ratio. Indicates the initial voltage. This indicates the voltage ratio.

5. The method for measuring the crack depth of a pressure pipeline based on the potentiometric method according to claim 4, characterized in that, The functional model between the voltage ratio and the crack depth characterization is determined as follows: Create a pipe model with cracks and preset multiple crack depths; A current input point and a current output point are set; the current input point and the current output point are along the axial direction of the pipe to be tested and pass through the crack, and the current input point and the current output point are symmetrically distributed on the pipe on both sides of the crack. A pair of measuring points are arranged; the two measuring points in the pair are symmetrical about the crack center. A low voltage is applied to the current input point and the current output point, and the voltage at the pair of measuring points is measured at each crack depth; Use the voltage at the measuring point corresponding to the minimum crack depth as the initial voltage; Based on multiple crack depths, initial voltages, and the voltages at each pair of measuring points at each crack depth, a curve is determined between the voltage ratio and the crack depth characterization; the voltage ratio is the ratio of the output voltage of the measuring point to the initial voltage. Based on the curve, a numerical simulation method is used to fit the curve and obtain a functional model between the voltage ratio and the crack depth characterization.

6. A system for measuring the crack depth of a pressure pipeline based on the potentiometric method, characterized in that, The measurement system includes: a computer, a cloud server, and the pressure pipeline crack depth measurement device based on the potential method as described in claim 1 or 2; The computer's input terminal is connected to the pressure pipeline crack depth measuring device based on the potentiometric method, and the computer's output terminal is connected to a cloud server; the computer is used to receive the crack depth on the pressure pipeline under test determined by the pressure pipeline crack depth measuring device based on the potentiometric method, and transmit it to the cloud server. The cloud server is used to issue an alarm when the depth of the crack on the pressure pipeline under test is greater than the critical length value, and to determine that the crack is in an expanding state when the current value of the crack depth on the pressure pipeline under test is greater than the previous measurement value.

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