Intelligent detection device for buried pressure pipeline

Abstract

The application discloses a buried pressure pipeline intelligent detection device. The application comprises an overall test detection device, a data acquisition circuit and a later data transmission storage processing. The intelligent detection system generates a detection excitation signal under the command of periodical detection or remote detection, and an automatic measurement auxiliary circuit starts to work after receiving the detection excitation signal. A detection pile detects a pipeline to be detected and connects a voltage / current / resistance measurement circuit through a corresponding parameter interface to output the following pipeline information: parameters such as pipe ground potential, open circuit potential, AC / DC current and stray current. The output parameter information is transmitted to a processor through an analog-digital conversion circuit and transmitted to a PC through a wireless data transmission module by using a serial port protocol. Through the application, the measurement error caused by manual operation is reduced, and the problem that the detection result of the pipeline to be detected under complex working conditions is inaccurate in the related art by using a single method is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of buried pressure pipeline, in particular to an intelligent detection device for detecting multiple data of buried pressure pipeline potential, AC / DC current, stray current and the like. BACKGROUND

[0002] Buried pressure pipeline is a kind of special equipment related to life safety with high risk. Pressure pipeline is like the lifeblood of industrial production and urban life, and the medium conveyed often has high risk of flammability, explosiveness and toxicity. The safety of buried pressure pipeline is directly related to the safety of industry and city. Buried metal pipeline will be corroded and perforated due to the influence of external soil pH, external bacterial corrosion, internal medium corrosion on metal pipeline and electrochemical corrosion, resulting in leakage accidents. Since the buried metal pipeline is corroded and leaks, it cannot be found in time, resulting in internal medium leakage, soil and groundwater pollution, and even fire and explosion. In order to prevent accidents and ensure the safe operation of the pipeline, it is very important to detect corrosion and leakage.

[0003] At present, there are some research results and inventions that can complete related detection. However, the detection method of the prior art can only complete the determination of pipeline potential, AC / DC current, and usually requires manual repetitive operation, which is greatly affected by weather and environment. SUMMARY

[0004] The main purpose of the present application is to provide an intelligent detection device for buried pressure pipeline to solve the problems mentioned in the background.

[0005] In order to achieve the above purpose, the present application provides an intelligent detection device for detecting multiple data of buried pressure pipeline potential, current, stray current and the like. The device comprises an automatic measurement auxiliary circuit, a voltage / current measurement circuit, an analog-to-digital conversion circuit, a main control circuit and an upper computer processing system. The automatic auxiliary measurement circuit automatically converts the connection mode of the measured pipeline according to the signal generated by the main control circuit, and detects the voltage, current, resistance and other parameters of the measured pipeline in combination with the voltage / current measurement circuit; the analog-to-digital conversion circuit comprises an A / D conversion circuit with a microcontroller as the core, a power supply circuit and the like, reads the data of the AD chip, converts the analog signal to digital signal and the like; the main control circuit has parameter detection control, realizes automatic range switching, data storage, reading and transmission and the like; the upper computer processing system is a PC with a wireless data transmission module to realize wireless communication function, and can wake up the detection device at regular intervals or remotely. At the same time, the device further comprises a constant current power supply to provide stable power supply required by the measurement circuit; a relay to convert and transmit the detection signal; a terminal post to connect the detection device with the buried pipeline and the reference electrode; and a reference electrode as a reference when measuring the potential value of other electrodes.

[0006] Further, the device further comprises a digital isolation chip, which realizes the isolation between the electronic system and the user, meets the safety regulations and reduces the noise of the ground loop.

[0007] Further, the device further comprises a solar circuit board, which realizes the long-time working requirement of the detection device.

[0008] The voltage and current measurement circuit comprises a power supply circuit part, and the power supply circuit comprises a power supply interface P1, a first overcurrent protection switch F1, a second overcurrent protection switch F2, a first voltage stabilizing diode D4, a second voltage stabilizing diode D5, a first polarity capacitor C1, a second polarity capacitor C2, a first resistor R1, a second resistor R5, a first light emitting diode D1 and a second light emitting diode D3. The power supply interface P1 is a three-pin socket, the 1-pin of P1 is connected to one end of the first overcurrent protection switch F1, the other end of F1 is connected to the cathode of the first voltage stabilizing diode D4, one end of the first polarity capacitor C1 and one end of the first resistor R1, the other end of the first resistor R1 is connected to the anode of the first light emitting diode D1, the cathode of D1 is grounded, the 2-pin of P1 is connected to the cathode of the second voltage stabilizing diode D5, the anode of the first voltage stabilizing diode D4, one end of the second polarity capacitor C2 and one end of the first polarity capacitor C1, the 3-pin of P1 is connected to one end of the second overcurrent protection switch F2, the other end of F2 is connected to the anode of the second voltage stabilizing diode D5, one end of the second polarity capacitor C2, one end of the first polarity capacitor C1 and one end of the second resistor R5, the other end of R5 is connected to the cathode of the second light emitting diode D3, and the anode of D3 is grounded.

[0009] The voltage and current measurement circuit further comprises an external interface circuit part. The external interface circuit comprises an external interface P2, a first relay U1, a second relay U4, a third relay U6, a fourth relay U8, a fifth relay U9, a sixth relay U12, a third light emitting diode D2, a fourth light emitting diode D6, a fifth light emitting diode D9, a sixth light emitting diode D10, a seventh light emitting diode D11, an eighth light emitting diode D14, a third resistor R2, a fourth resistor R3, a fifth resistor R4, a sixth resistor R7, a seventh resistor R8, an eighth resistor R9, a ninth resistor R10, a tenth resistor R11, an eleventh resistor R12, a twelfth resistor R13, a thirteenth resistor R14, a fourteenth resistor R21, a fifteenth resistor R22, a sixteenth resistor R23, a seventeenth resistor R30, an eighteenth resistor R31, a nineteenth resistor R33, a twentieth resistor R36, a twenty-first resistor R37, a twenty-second resistor R39, a twenty-third resistor R44, a twenty-fourth resistor R45, a twenty-fifth resistor R46, a first triode Q1, a second triode Q2, a third triode Q3, a fourth triode Q4, a fifth triode Q5, a sixth triode Q6, a third diode D7, a fourth diode D8. The external interface P2 is a six-pin interface, the 1-pin of P2 is connected to the 2-pin and the 6-pin of the first relay U1, the 1-pin of U1 is connected to the anode of the third light emitting diode D2, the cathode of D2 is connected to one end of the fifth resistor R4, the other end of R4 is connected to the 8-pin of U1 and the 3-pin of the first triode Q1, the 1-pin of Q1 is connected to one end of the third resistor R2 and one end of the fourth resistor R3, the other end of R2 is connected to the CH_PIPE terminal, the other end of R3 is connected to the 2-pin of Q1, the 6-pin of the first relay U1 is connected to the anode of the third diode D7, the cathode of the fourth diode D8, one end of the ninth resistor R10, one end of the tenth resistor R11, one end of the eleventh resistor R12, one end of the twelfth resistor R13, one end of the thirteenth resistor R14 and the current measurement I_OPA terminal; the 2-pin of P2 is connected to the 2-pin and the 6-pin of the second relay U4 for cathode protection, the 1-pin of U4 is connected to the anode of the fourth light emitting diode D6, the cathode of D6 is connected to one end of the ninth resistor R9, the other end of R9 is connected to the 8-pin of U4 and the 3-pin of the second triode Q2, the 1-pin of Q2 is connected to one end of the sixth resistor R7 and one end of the seventh resistor R8, the other end of R7 is connected to the CH_SC terminal, the other end of R8 is connected to the 2-pin of Q2, the 6-pin of the second relay U4 is connected to the cathode of the third diode D7, the anode of the fourth diode D8, one end of the ninth resistor R10, one end of the tenth resistor R11, one end of the eleventh resistor R12, one end of the twelfth resistor R13, one end of the thirteenth resistor R14 and the ground terminal;The 3-pin access reference electrode 1 of P2 connects the 4-pin and 5-pin of the third relay U6, the 1-pin of U6 connects the anode of the fifth light emitting diode D9, the cathode of D9 connects one end of the sixteenth resistor R23, the other end of R23 connects the 8-pin of U6 and the 3-pin of the third triode Q3, the 1-pin of Q3 connects one end of the fourteenth resistor R21 and one end of the fifteenth resistor R22, the other end of R21 connects CH_CSE_A, the other end of R22 is commonly grounded with the 2-pin of Q3, the 6-pin of the third relay U6 connects V_TR terminal; the 4-pin of P2 connects the 4-pin and 5-pin of the fourth relay U8, the 1-pin of U8 connects the anode of the sixth light emitting diode D10, the cathode of D10 connects one end of the seventeenth resistor R30, the other end of R30 connects the 8-pin of U8 and the 3-pin of the fourth triode Q4, the 1-pin of Q4 connects one end of the seventeenth resistor R30 and one end of the eighteenth resistor R31, the other end of R30 connects CH_CSE_B, the other end of R31 is commonly grounded with the 2-pin of Q4, the 6-pin of the fourth relay U8 connects V_TR terminal; the 5-pin of P2 connects the 4-pin and 5-pin of the fifth relay U9, the 1-pin of U9 connects the anode of the seventh light emitting diode D11, the cathode of D11 connects one end of the twenty-second resistor R39, the other end of R39 connects the 8-pin of U9 and the 3-pin of the fifth triode Q5, the 1-pin of Q5 connects one end of the twentieth resistor R36 and one end of the twenty-first resistor R37, the other end of R36 connects CH_CSE_C, the other end of R37 is commonly grounded with the 2-pin of Q5, the 6-pin of the fifth relay U9 connects V_TR terminal; the 6-pin of P2 connects the 4-pin and 5-pin of the sixth relay U12, the 1-pin of U12 connects the anode of the eighth light emitting diode D14, the cathode of D14 connects one end of the twenty-fifth resistor R46, the other end of R46 connects the 8-pin of U12 and the 3-pin of the sixth triode Q6, the 1-pin of Q6 connects one end of the twenty-third resistor R44 and one end of the twenty-fourth resistor R45, the other end of R45 connects CH_CSE_D, the other end of R44 is commonly grounded with the 2-pin of Q6, the 6-pin of the fifth relay U12 connects the voltage measurement V_TR terminal.

[0010] The voltage current measurement circuit further comprises a current measurement channel. The current measurement channel comprises a first operational amplifier U2, a second operational amplifier U3, a third operational amplifier U7, a seventh relay U5, a twenty-sixth resistor R61, a twenty-seventh resistor R15, a twenty-eighth resistor R6, a twenty-ninth resistor R16, a thirtieth resistor R63, a thirty-first resistor R24, a thirty-second resistor R17, a thirty-third resistor R18, a thirty-fourth resistor R19, a thirty-fifth resistor R20, a thirty-sixth resistor R27, a thirty-seventh resistor R28, a thirty-eighth resistor R25, a thirty-ninth resistor R29, a seventh transistor Q7, a third polarity capacitor C3, a fourth polarity capacitor C4, a fifth polarity capacitor C5, and a sixth polarity capacitor C11. One end of the twenty-sixth resistor R61 is connected to the I_OPA terminal, the other end of the R61 is connected to the 3 pin of the first operational amplifier U2, the 2 pin of the U2 is connected to one end of the twenty-seventh resistor R15 and one end of the twenty-eighth resistor R6, the other end of the R15 is grounded, the other end of the R6 is connected to the 6 pin of the U2 and the 3 pin of the second operational amplifier U3, the 4 pin and the 7 pin of the U2 are connected to the -5V_1 terminal, the 1 pin, the 5 pin and the 8 pin of the U2 are left floating, the 4 pin of the U3 is connected to the -5V_1 terminal, the 7 pin of the U3 is connected to the 5V_1 terminal, the 1 pin, the 5 pin and the 8 pin of the U3 are left floating, the 2 pin of the U3 is connected to one end of the twenty-ninth resistor R16 and the 3 pin of the seventh relay U5, the other end of the R16 is grounded, the 6 pin of the U3 is connected to one end of the thirty-fourth R18, one end of the thirty-fifth resistor R20 and one end of the thirty-sixth resistor R27, the 1 pin of the seventh relay U5 is connected to the 5V_1 terminal, the 8 pin of the U5 is connected to the 3 pin of the seventh transistor Q7, the 1 pin of the Q7 is connected to one end of the thirtieth resistor R63 and one end of the thirty-first resistor R24, the other end of the R63 is connected to the GAIN_CTL_2 terminal, the other end of the R24 is connected to the 2 pin of the Q7 and then grounded, the 7 pin of the U5 is connected to one end of the thirty-second resistor R17, the other end of the R17 is connected to one end of the thirty-third resistor R18, the 5 pin of the U5 is connected to one end of the thirty-fourth resistor R19, the other end of the R9 is connected to one end of the thirty-fifth resistor R20, the other end of the R18 and the R20 is connected to the 6 pin of the U3 in parallel and then connected to one end of the R27, the other end of the R27 is connected to one end of the thirty-seventh resistor R28 and the 3 pin of the third operational amplifier U7, the other end of the R28 is connected to one end of the sixth polarity capacitor C11 and the VREF_1.65V terminal, the 1 pin, the 5 pin and the 8 pin of the U7 are left floating, the 2 pin of the U7 is connected to one end of the thirty-eighth resistor R25, the other end of the R25 is connected to the 6 pin of the U7 and one end of the thirty-ninth resistor R29, the 4 pin of the U7 is connected to the -5V_1 terminal, the 7 pin of the U7 is connected to the 5V_1 terminal, the other end of the R29 is connected to one end of the fifth polarity capacitor C5 and the I_ADC terminal, the other end of the C5 is grounded. The power input terminal and the power ground terminal are connected through the third polarity capacitor C3 and the fourth polarity capacitor C4.

[0011] The voltage current measurement circuit further comprises a current measurement channel. The voltage measurement channel comprises a forty-first resistor R32, a forty-second resistor R34, a forty-third resistor R35, a forty-fourth resistor R38, a forty-fifth resistor R42, a forty-sixth resistor R40, a forty-seventh resistor R41, a forty-eighth resistor R43, a forty-ninth resistor R48, a fiftieth resistor R49, a fifty-first resistor R50, a fifty-second resistor R64, a fifty-third resistor R55, a fifty-fourth resistor R47, a fifty-fifth resistor R51, a fifty-sixth resistor R52, a fifty-seventh resistor R53, a fifty-eighth resistor R54, a fifty-ninth resistor R56, a sixtieth resistor R57, a sixty-first resistor R58, a first rectifier D12, a second rectifier D13, a first rail-to-rail operational amplifier U10, a first differential amplifier U11, an eighth relay U13, an eighth transistor Q8, a seventh polarity capacitor C7, an eighth polarity capacitor C8, a ninth polarity capacitor C9, a tenth polarity capacitor C10, an eleventh polarity capacitor C6, a twelfth polarity capacitor C12, a first voltage reference U15, a fourth operational amplifier U14.V_TR end connects the fourth resistance R26, the forty-first resistance R32, the forty-second resistance R34, the forty-third resistance R35, the forty-fourth resistance R38, the other end of R38 connects the one end of the forty-fifth resistance R42, the one end of the first rectifier D12, the one end of the forty-sixth resistance R40, the one end of the forty-eighth resistance R43, the other end of R42 is grounded, the other end of D12 is connected with the one end of the second rectifier D13, the other end of D13 is grounded, the other end of the forty-sixth resistance R40 is connected with the 3 pin of the first rail to rail operational amplifier U10A, the 1 pin and the 2 pin of U10A are connected with the other end of R41, the 8 pin of U10A is connected with the 5V_1 end, the 4 pin of U10A is connected with the -5V_1 end, the other end of the forty-eighth resistance R43 is connected with the 5 pin of U10B, the 6 pin of U10B is connected with the one end of the forty-ninth resistance R48 and the one end of the fiftieth resistance R49, the other end of R48 is grounded, the other end of R49 is connected with the 7 pin of U10B and the 3 pin of the first differential amplifier U11, the 1 pin of U11 is connected with the one end of the twelfth polarized capacitor C12 and the 6 pin of the fourth operational amplifier U14, the other end of C12 is grounded, the 2 pin of U11 is grounded, the 4 pin is connected with the 5V_1 end, the 5 pin is connected with the one end of the fifty-first resistance R50 and the 3 pin of the eighth relay U13, the 6 pin of U11 is connected with the fifty-fourth resistance R47, the 7 pin is connected with the -5V_1 end, the 8 pin is suspended, the 1 pin of the eighth collector U13 is connected with the 5V_1 end, the 5 pin is connected with the series resistance of the fifty-seventh resistance R53 and the fifty-eighth resistance R54, the 7 pin of U13 is connected with the series resistance of the fifty-fifth resistance R51 and the fifty-sixth resistance R52, the 8 pin of U13 is connected with the 3 pin of the eighth triode Q8, the 1 pin of Q8 is connected with the one end of the fifty-second resistance R64 and the one end of the fifty-third resistance R55, the other end of R64 is connected with the GAIN_CTL_1 end, the other end of R55 is grounded, the 2 pin of Q8 is grounded, the other ends of R52 and R54 are connected with the one end of the fifty-fourth resistance R47 in parallel, the other end of R47 is connected with the one end of the eleventh polarized capacitor C6 and the V_ADC end, the other end of C6 is grounded, the 1 pin, the 5 pin and the 8 pin of the fourth operational amplifier U14 are suspended, the 4 pin is grounded, the 7 pin is connected with the 5V_1 end, the 3 pin and the 6 pin are connected through the sixty-first resistance R58, the 2 pin of U14 is connected with the one end of the fifty-ninth resistance R56 and the one end of the sixtieth resistance R57, the other end of R56 is connected with the one end of the tenth polarized capacitor C10 and the 2 pin of the first voltage reference U15, the 1 pin of U15 is connected with the 5V_1 end input voltage and the anode of the ninth polarized capacitor C9, the cathode of C9, the 3 pin of U15 and the cathode of C10 are grounded. The power input end 5V_1 is connected with the power ground end through the seventh polarized capacitor C7, the power input end -5V_1 is connected with the power ground end through the eighth polarized capacitor C8.

[0012] Compared with the prior art, the application has the following beneficial effects:

[0013] (1) The application controls the measurement circuit and the auxiliary circuit by the processor to automatically switch the circuit when different parameters are measured, and is used for acquiring the following at least one of the signals detected by the buried pipeline: power-on potential, power-off potential, natural potential, alternating voltage, alternating current, direct current, AC and DC stray current, so as to solve the problem that the detection result of the detected object under complex working conditions is inaccurate in the related art, and further achieve the effect that the detection result of the detected object under complex working conditions is more comprehensive.

[0014] (2) The intelligent detection device stores a timing wake-up function or a remote wake-up function to start the equipment, can complete the periodic and fixed-point detection of the measured object according to the actual needs, then uses the built-in data transmission module of the device to perform remote transmission, and the built-in charging battery can ensure that the device operates for several months through battery power supply, and the device has a solar charging module to exclude the possibility of power failure of the detection device, solves the problem that a large amount of manpower and material resources are needed for on-site measurement in the related art, and further achieves the effect of periodically monitoring the operation data of the buried pipeline. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated in and constitute a part of this application. The embodiments of the application illustrated in the drawings, and their description thereto, are presented to provide the practitioner with a thorough and enabling disclosure of the application, and are included as part of this disclosure. In the drawings:

[0016] Figure 1 is a system structure diagram of the application;

[0017] Figure 2 is a general framework schematic diagram of the application;

[0018] Figure 3 is a device interface schematic diagram of the application;

[0019] Figure 4 is a power supply circuit diagram of the application;

[0020] Figure 5 is an external interface circuit diagram of the application;

[0021] Figure 6 is a current measurement channel circuit diagram of the application;

[0022] Figure 7 is a voltage measurement channel circuit diagram of the application; DETAILED DESCRIPTION

[0023] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0024] In order to make personnel in the art better understand the schemes of the present application, the technical schemes in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should belong to the scope of protection of the present application.

[0025] It should be noted that the terms "first", "second", and the like in the specification and claims of the present application and the above-described drawings are applicable to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0026] The present embodiment provides an intelligent detection device for buried pressure pipeline. As shown in Figure 1 , Figure 2 The device includes a voltage / current measurement circuit, an automatic measurement auxiliary circuit, an analog-to-digital conversion circuit, and an upper computer processing system. The voltage / current measurement circuit includes an external interface circuit, a current measurement channel, a voltage measurement channel, a power supply circuit, a controller circuit, etc. The automatic measurement auxiliary circuit includes a voltage measurement auxiliary circuit, a current measurement auxiliary circuit, a power-on measurement circuit, a power-off measurement circuit, etc. The analog-to-digital conversion circuit includes an A / D conversion circuit, a power supply circuit, a key circuit, a display circuit, etc. The upper computer processing system is a PC. The device is equipped with four reference electrodes, and the reference electrode material is a copper / saturated copper sulfate electrode (CSE).

[0027] When measuring the open circuit potential of the sacrificial anode, the processor 1 activates the main control circuit 3 to generate a detection signal. The automatic auxiliary measurement circuit 4 disconnects the connection between the sacrificial anode 11 and the pipeline 10 according to the received detection signal, disconnects the connection between the relay 603 and the terminal post 704 and the terminal post 705, disconnects the connection between the relay 602 and the detection system, disconnects the standard resistor 5, places the reference electrode 903 on the moist soil 12 directly above the sacrificial anode buried position, ensures that the bottom of the reference electrode 903 is in good contact with the ground soil 12, and adjusts the circuit reading of the open circuit potential analog signal of the sacrificial anode according to the measured pipeline parameters through the current and voltage collection circuit 8. The open circuit potential of the sacrificial anode is measured through the A / D conversion circuit 7, and the measured data is transmitted to the upper computer processing system through the RS232 serial communication interface 6. The upper computer processing system processes the data and displays the data on the display circuit 9. Figure 2The analog-digital conversion circuit in the processor 1 performs digital-analog conversion, and the converted digital signal is transmitted to the PC through the serial port of the processor 1. After the measurement is completed, the connection between the sacrificial anode and the buried pipeline is restored. When the pipe-to-soil potential of the sacrificial anode access point is measured, the processor 1 activates the main control circuit 3 to generate a detection signal, the automatic auxiliary measurement circuit 4 disconnects the relay 603 from the terminal post 703 and the terminal post 705 according to the received detection signal, disconnects the standard resistor 5, the current-voltage acquisition circuit 8 reads the pipe-to-soil potential of the pipeline according to the measured pipeline parameter adjustment circuit, and then the automatic auxiliary measurement circuit 4 disconnects the relay 603 from the terminal post 704 and closes the relay 603 from the terminal post 705. The current-voltage acquisition circuit 8 reads the pipe-to-soil potential of the pipeline according to the measured pipeline parameter adjustment circuit. When the pipe-to-soil potentials measured twice differ by less than 2.5 mV, the pipe-to-soil potential value measured by the terminal post 705 is taken as the pipe-to-soil potential of the test point, which is transmitted to the PC through the serial port of the processor 1. Figure 2 The analog-digital conversion circuit in the processor 1 performs digital-analog conversion, and the converted digital signal is transmitted to the PC through the serial port of the processor 1. After the measurement is completed, the connection between the sacrificial anode and the buried pipeline is restored. When the pipe-to-soil potential of the sacrificial anode access point is measured, the processor 1 activates the main control circuit 3 to generate a detection signal, the automatic auxiliary measurement circuit 4 disconnects the relay 603 from the terminal post 703 and the terminal post 705 according to the received detection signal, disconnects the standard resistor 5, the current-voltage acquisition circuit 8 reads the pipe-to-soil potential of the pipeline according to the measured pipeline parameter adjustment circuit, and then the automatic auxiliary measurement circuit 4 disconnects the relay 603 from the terminal post 704 and closes the relay 603 from the terminal post 705. The current-voltage acquisition circuit 8 reads the pipe-to-soil potential of the pipeline according to the measured pipeline parameter adjustment circuit. When the pipe-to-soil potentials measured twice differ by less than 2.5 mV, the pipe-to-soil potential value measured by the terminal post 705 is taken as the pipe-to-soil potential of the test point, which is transmitted to the PC through the serial port of the processor 1. Figure 2 The analog-digital conversion circuit in the processor 1 performs digital-analog conversion, and the converted digital signal is transmitted to the PC through the serial port of the processor 1. After the measurement is completed, the connection between the sacrificial anode and the buried pipeline is restored. When the pipe-to-soil potential of the sacrificial anode access point is measured, the processor 1 activates the main control circuit 3 to generate a detection signal, the automatic auxiliary measurement circuit 4 disconnects the relay 603 from the terminal post 703 and the terminal post 705 according to the received detection signal, disconnects the standard resistor 5, the current-voltage acquisition circuit 8 reads the pipe-to-soil potential of the pipeline according to the measured pipeline parameter adjustment circuit, and then the automatic auxiliary measurement circuit 4 disconnects the relay 603 from the terminal post 704 and closes the relay 603 from the terminal post 705. The current-voltage acquisition circuit 8 reads the pipe-to-soil potential of the pipeline according to the measured pipeline parameter adjustment circuit. When the pipe-to-soil potentials measured twice differ by less than 2.5 mV, the pipe-to-soil potential value measured by the terminal post 705 is taken as the pipe-to-soil potential of the test point, which is transmitted to the PC through the serial port of the processor 1.

[0028] The reference electrode material is a copper / saturated copper sulfate electrode (CSE), the allowable current density flowing through the CSE is not greater than 5 μA / cm 2 , and the potential drift cannot exceed 30 mV.

[0029] Figure 3 The test pile interface of the intelligent detection device according to the embodiment of the application is shown in FIG. 1. Figure 3 The automatic auxiliary measurement circuit interface is arranged on the detection pile 13. After receiving the excitation signal, the automatic auxiliary measurement circuit triggers the detection pile to start working and detects the pipeline. Optionally, the detection pile can detect the pipe-to-soil voltage, open circuit potential, direct current and other parameters. The current-voltage acquisition circuit interface and the resistance measurement circuit interface are arranged on the detection pile to measure the detected pipe-to-soil voltage, open circuit potential, direct current and other parameters.

[0030] Figure 4The power supply circuit part according to the embodiment of the present application has the function of voltage conversion, converts the high voltage input from the outside into the voltage output required by the device after the voltage stabilizing chip, and has the partial protection function, which can stop supplying current to the control circuit when the external voltage is abnormal, and protect the whole detection device circuit from damage. The power supply circuit includes a power supply interface P1, a first overcurrent protection switch F1, a second overcurrent protection switch F2, a first voltage stabilizing diode D4, a second voltage stabilizing diode D5, a first polarity capacitor C1, a second polarity capacitor C2, a first resistor R1, a second resistor R5, a first light emitting diode D1, and a second light emitting diode D3. The power supply interface P1 is a three-pin socket, the 1-pin of P1 is connected to one end of the first overcurrent protection switch F1, the other end of F1 is connected to the cathode of the first voltage stabilizing diode D4, one end of the first polarity capacitor C1, and one end of the first resistor R1, the other end of the first resistor R1 is connected to the anode of the first light emitting diode D1, the cathode of D1 is grounded, the 2-pin of P1 is connected to the cathode of the second voltage stabilizing diode D5, the anode of the first voltage stabilizing diode D4, one end of the second polarity capacitor C2, and one end of the first polarity capacitor C1, and the 3-pin of P1 is connected to one end of the second overcurrent protection switch F2, the other end of F2 is connected to the anode of the second voltage stabilizing diode D5, one end of the second polarity capacitor C2, one end of the first polarity capacitor C1, and one end of the second resistor R5, the other end of R5 is connected to the cathode of the second light emitting diode D3, and the anode of D3 is grounded.

[0031] Figure 5 The external interface circuit part according to the embodiment of the present application is used to connect external detection piles, accept detection data related parameters, and can play the role of automatic adjustment and conversion circuit. The external interface circuit includes an external interface P2, a first relay U1, a second relay U4, a third relay U6, a fourth relay U8, a fifth relay U9, a sixth relay U12, a third light emitting diode D2, a fourth light emitting diode D6, a fifth light emitting diode D9, a sixth light emitting diode D10, a seventh light emitting diode D11, an eighth light emitting diode D14, a third resistor R2, a fourth resistor R3, a fifth resistor R4, a sixth resistor R7, a seventh resistor R8, an eighth resistor R9, a ninth resistor R10, a tenth resistor R11, an eleventh resistor R12, a twelfth resistor R13, a thirteenth resistor R14, a fourteenth resistor R21, a fifteenth resistor R22, a sixteenth resistor R23, a seventeenth resistor R30, an eighteenth resistor R31, a nineteenth resistor R33, a twentieth resistor R36, a twenty-first resistor R37, a twenty-second resistor R39, a twenty-third resistor R44, a twenty-fourth resistor R45, a twenty-fifth resistor R46, a first triode Q1, a second triode Q2, a third triode Q3, a fourth triode Q4, a fifth triode Q5, a sixth triode Q6, a third diode D7, and a fourth diode D8.

[0032] The external interface P2 is a six-pin interface, the 1st pin of P2 is connected to the 2nd pin and the 6th pin of the first relay U1, the 1st pin of U1 is connected to the anode of the 3rd light emitting diode D2, the cathode of D2 is connected to one end of the 5th resistor R4, the other end of R4 is connected to the 8th pin of U1 and the 3rd pin of the 1st triode Q1, the 1st pin of Q1 is connected to one end of the 3rd resistor R2 and one end of the 4th resistor R3, the other end of R2 is connected to CH_PIPE, the other end of R3 is grounded together with the 2nd pin of Q1, the 6th pin of the first relay U1 is connected to the anode of the 3rd diode D7, the cathode of the 4th diode D8, one end of the 9th resistor R10, one end of the 10th resistor R11, one end of the 11th resistor R12, one end of the 12th resistor R13, one end of the 13th resistor R14 and the current measuring I_OPA; the 2nd pin of P2 is connected to the 2nd pin and the 6th pin of the second relay U4, the 1st pin of U4 is connected to the anode of the 4th light emitting diode D6, the cathode of D6 is connected to one end of the 9th resistor R9, the other end of R9 is connected to the 8th pin of U4 and the 3rd pin of the 2nd triode Q2, the 1st pin of Q2 is connected to one end of the 6th resistor R7 and one end of the 7th resistor R8, the other end of R7 is connected to CH_SC, the other end of R8 is grounded together with the 2nd pin of Q2, the 6th pin of the second relay U4 is connected to the cathode of the 3rd diode D7, the anode of the 4th diode D8, one end of the 9th resistor R10, one end of the 10th resistor R11, one end of the 11th resistor R12, one end of the 12th resistor R13, one end of the 13th resistor R14 and the ground; the 3rd pin of P2 is connected to the 4th pin and the 5th pin of the third relay U6, the 1st pin of U6 is connected to the anode of the 5th light emitting diode D9, the cathode of D9 is connected to one end of the 16th resistor R23, the other end of R23 is connected to the 8th pin of U6 and the 3rd pin of the 3rd triode Q3, the 1st pin of Q3 is connected to one end of the 14th resistor R21 and one end of the 15th resistor R22, the other end of R21 is connected to CH_CSE_A, the other end of R22 is grounded together with the 2nd pin of Q3, the 6th pin of the third relay U6 is connected to V_TR; the 4th pin of P2 is connected to the 4th pin and the 5th pin of the fourth relay U8, the 1st pin of U8 is connected to the anode of the 6th light emitting diode D10, the cathode of D10 is connected to one end of the 17th resistor R30, the other end of R30 is connected to the 8th pin of U8 and the 3rd pin of the 4th triode Q4, the 1st pin of Q4 is connected to one end of the 17th resistor R30 and one end of the 18th resistor R31, the other end of R30 is connected to CH_CSE_B, the other end of R31 is grounded together with the 2nd pin of Q4, the 6th pin of the fourth relay U8 is connected to V_TR.The 5th pin of P2 is connected to the 4th and 5th pins of the 3rd relay U9, the 1st pin of U9 is connected to the anode of the 7th LED D11, the cathode of D11 is connected to one end of the 22nd resistor R39, the other end of R39 is connected to the 8th pin of U9 and the 3rd pin of the 5th transistor Q5, the 1st pin of Q5 is connected to one end of the 20th resistor R36 and one end of the 21st resistor R37, the other end of R36 is connected to CH_CSE_C, the other end of R37 is connected to the 2nd pin of Q5 and grounded, the 6th pin of U9 is connected to V_TR; the 6th pin of P2 is connected to the 4th and 5th pins of the 4th relay U12, the 1st pin of U12 is connected to the anode of the 8th LED D14, the cathode of D14 is connected to one end of the 25th resistor R46, the other end of R46 is connected to the 8th pin of U12 and the 3rd pin of the 6th transistor Q6, the 1st pin of Q6 is connected to one end of the 23rd resistor R44 and one end of the 24th resistor R45, the other end of R45 is connected to CH_CSE_D, the other end of R44 is connected to the 2nd pin of Q6 and grounded, the 6th pin of U12 is connected to the voltage measuring terminal V_TR.

[0033] Figure 6 The current measurement circuit part according to the embodiment of the present application receives the current signal transmitted by the external interface circuit, measures the direct current, alternating current, stray current and other parameters of the pipe under test. The current measurement circuit includes the first operational amplifier U2, the second operational amplifier U3, the third operational amplifier U7, the 7th relay U5, the 26th resistor R61, the 27th resistor R15, the 28th resistor R6, the 29th resistor R16, the 30th resistor R63, the 31st resistor R24, the 32nd resistor R17, the 33rd resistor R18, the 34th resistor R19, the 35th resistor R20, the 36th resistor R27, the 37th resistor R28, the 38th resistor R25, the 39th resistor R29, the 7th transistor Q7, the 3rd polarity capacitor C3, the 4th polarity capacitor C4, the 5th polarity capacitor C5 and the 6th polarity capacitor C11.

[0034] The current information input I OPA end connects one end of the twenty-sixth resistor R61, the other end of R61 connects the 3 pin of the first operational amplifier U2, the 2 pin of U2 connects one end of the twenty-seventh resistor R15 and one end of the twenty-eighth resistor R6, the other end of R15 is grounded, the other end of R6 connects the 6 pin of U2 and the 3 pin of the second operational amplifier U3, the 4 pin and 7 pin of U2 connect the -5V 1 end, the 1, 5, 8 pins of U2 are left floating, the 4 pin of U3 connects the -5V 1 end, the 7 pin of U3 connects the 5V 1 end, the 1, 5, 8 pins of U3 are left floating, the 2 pin of U3 connects one end of the twenty-ninth resistor R16 and the 3 pin of the seventh relay U5, the other end of R16 is grounded, the 6 pin of U3 connects one end of the thirty-fourth resistor R18, one end of the thirty-fifth resistor R20 and one end of the thirty-sixth resistor R27, the 1 pin of U5 connects the 5V 1 end, the 8 pin of U5 connects the 3 pin of the seventh triode Q7, the 1 pin of Q7 connects one end of the thirtieth resistor R63 and one end of the thirty-first resistor R24, the other end of R63 connects the GAIN CTL 2 end, the other end of R24 is connected in parallel with the 2 pin of Q7 and then grounded, the 7 pin of U5 connects one end of the thirty-second resistor R17, the other end of R17 connects one end of the thirty-third resistor R18, the 5 pin of U5 connects one end of the thirty-fourth resistor R19, the other end of R9 connects one end of the thirty-fifth resistor R20, the other ends of R18 and R20 are connected in parallel with the 6 pin of U3 and then one end of R27 in series, the other end of R27 connects one end of the thirty-seventh resistor R28 and the 3 pin of the third operational amplifier U7, the other end of R28 connects one end of the sixth polarity capacitor C11 and the VREF 1.65V end, the 1, 5, 8 pins of U7 are left floating, the 2 pin of U7 connects one end of the forty-third resistor R25, the other end of R25 connects the 6 pin of U7 and one end of the thirty-ninth resistor R29, the 4 pin of U7 connects the -5V 1 end, the 7 pin of U7 connects the 5V 1 end, the other end of R29 connects one end of the fifth polarity capacitor C5 and the I ADC end, the other end of C5 is grounded. The power supply input end and the power supply ground end are connected through the third polarity capacitor C3 and the fourth polarity capacitor C4.

[0035] Figure 7The voltage measurement circuit part according to the embodiment of the present application receives the voltage signal transmitted by the external interface circuit, and measures the parameters such as the pipe ground potential, the natural potential, the open circuit potential, and the like of the pipe under test. The voltage measurement channel comprises the 40th resistor R26, the 41st resistor R32, the 42nd resistor R34, the 43rd resistor R35, the 44th resistor R38, the 45th resistor R42, the 46th resistor R40, the 47th resistor R41, the 48th resistor R43, the 49th resistor R48, the 50th resistor R49, the 51st resistor R50, the 52nd resistor R64, the 53rd resistor R55, the 54th resistor R47, the 55th resistor R51, the 56th resistor R52, the 57th resistor R53, the 58th resistor R54, the 59th resistor R56, the 60th resistor R57, the 61st resistor R58, the first rectifier D12, the second rectifier D13, the first rail-to-rail operational amplifier U10, the first differential amplifier U11, the eighth relay U13, the seventh polarity capacitor C7, the eighth polarity capacitor C8, the ninth polarity capacitor C9, the tenth polarity capacitor C10, the eleventh polarity capacitor C6, the twelfth polarity capacitor C12, the first voltage reference U15, and the fourth operational amplifier U14.

[0036] The voltage information input V_TR end is connected to the fourth series resistance R26, the forty-first resistance R32, the forty-second resistance R34, the forty-third resistance R35, the forty-fourth resistance R38, the other end of R38 is connected to one end of the forty-fifth resistance R42, one end of the first rectifier D12, one end of the forty-sixth resistance R40, one end of the forty-eighth resistance R43, the other end of R42 is grounded, the other end of D12 is connected to one end of the second rectifier D13, the other end of D13 is grounded, the other end of the forty-sixth resistance R40 is connected to the 3 pin of the first rail to rail operational amplifier U10A, the 1 pin and the 2 pin of U10A are connected to the other end of R41, the 8 pin of U10A is connected to the 5V_1 end, the 4 pin of U10A is connected to the -5V_1 end, the other end of the forty-eighth resistance R43 is connected to the 5 pin of U10B, the 6 pin of U10B is connected to one end of the forty-ninth resistance R48 and one end of the fiftieth resistance R49, the other end of R48 is grounded, the other end of R49 is connected to the 7 pin of U10B and the 3 pin of the first differential amplifier U11, the 1 pin of U11 is connected to one end of the twelfth polarity capacitor C12 and the 6 pin of the fourth operational amplifier U14, the other end of C12 is grounded, the 2 pin of U11 is grounded, the 4 pin is connected to the 5V_1 end, the 5 pin is connected to one end of the fifty-first resistance R50 and the 3 pin of the eighth relay U13, the 6 pin of U11 is connected to the fifty-fourth resistance R47, the 7 pin is connected to the -5V_1 end, the 8 pin is suspended, the 1 pin of the eighth collector U13 is connected to the 5V_1 end, the 5 pin is connected to the series resistance of the fifty-seventh resistance R53 and the fifty-eighth resistance R54, the 7 pin of U13 is connected to the series resistance of the fifty-fifth resistance R51 and the fifty-sixth resistance R52, the 8 pin of U13 is connected to the 3 pin of the eighth triode Q8, the 1 pin of Q8 is connected to one end of the fifty-second resistance R64 and one end of the fifty-third resistance R55, the other end of R64 is connected to the GAIN_CTL_1 end, the other end of R55 is grounded, the 2 pin of Q8 is grounded, the other ends of R52 and R54 are connected in parallel to one end of the fifty-fourth resistance R47, the other end of R47 is connected to one end of the eleventh polarity capacitor C6 and the V_ADC end, the other end of C6 is grounded, the 1, 5 and 8 pins of the fourth operational amplifier U14 are suspended, the 4 pin is grounded, the 7 pin is connected to the 5V_1 end, the 3 pin and the 6 pin are connected through the sixty-first resistance R58, the 2 pin of U14 is connected to one end of the fifty-ninth resistance R56 and one end of the sixtieth resistance R57, the other end of R56 is connected to one end of the tenth polarity capacitor C10 and the 2 pin of the first voltage reference U15, the 1 pin of U15 is connected to the 5V_1 end input voltage and connected to the anode of the ninth polarity capacitor C9, the cathode of C9, the 3 pin of U15 and the cathode of C10 are grounded. The power input end 5V_1 is connected to the power ground end through the seventh polarity capacitor C7, the power input end -5V_1 is connected to the power ground end through the eighth polarity capacitor C8.

[0037] The device is fully in line with the national standard GB / T 19285-2014, and the intelligent detection device is designed to further improve the automation of the test method and improve the accuracy of the test results. Through the host computer software processing, the experimental results are obtained quickly and efficiently, the data is saved, the manpower and material resources are saved, and the efficiency is improved.

Claims

1. A buried pressure pipeline intelligent detection device, characterized in that, The utility model relates to a kind of buried pipeline detection device, including: Intelligent detection system, according to periodic command or remote command, generates detection excitation signal; Detection stake, connecting detection device and buried pipeline and reference electrode, for starting work under the trigger of the detection excitation signal, and detecting and outputting the following electrical parameters of the detected pipeline: pipe ground potential, open circuit potential, AC and DC current, stray current; The device further includes the following circuits: main control circuit, automatic measurement auxiliary circuit, voltage / current / resistance measurement circuit and analog-digital conversion circuit;Wherein, The main control circuit has each parameter detection control, for realizing range automatic switching, data storage, reading, transmission and the like functions; The automatic measurement auxiliary circuit is used to automatically switch the connection mode of the detection device and the measured pipeline according to the signal generated by the main control circuit; The voltage / current / resistance measurement circuit is used to detect the voltage, current and resistance of the detected pipeline; Wherein, the analog-digital conversion circuit includes A / D conversion circuit and power supply circuit with microcontroller as the core, for reading the data of AD chip, converting analog signal to digital signal and the like functions; The device further includes relay, standard resistance, terminal post, sacrificial anode and reference electrode;Wherein, The relay includes: first relay, second relay and third relay; The terminal post includes: first terminal post, second terminal post, third terminal post, fourth terminal post and fifth terminal post; The reference electrode includes: first reference electrode, second reference electrode and third reference electrode; The first connection end of the first relay is connected to the second connection end of the first terminal post, the second connection end of the first relay is connected to the first connection end of the standard resistance and the main control circuit, and the first connection end of the first terminal post is connected to the sacrificial anode; The first connection end of the second relay is connected to the second connection end of the second terminal post, the second connection end of the second relay is connected to the second connection end of the standard resistance and the main control circuit, and the first connection end of the second terminal post is connected to the measured pipeline; The first connection end of the third relay is respectively connected to the second connection end of the third terminal post, the second connection end of the fourth terminal post and the second connection end of the fifth terminal post, the second connection end of the third relay is connected to the main control circuit, the first connection end of the third terminal post is connected to the third reference electrode, the first connection end of the fourth terminal post is connected to the second reference electrode, and the first connection end of the fifth terminal post is connected to the first reference electrode; The first relay, the second relay and the third relay are connected to the automatic measurement auxiliary circuit. The main control circuit is used for generating a corresponding detection signal when measuring the open circuit potential of the sacrificial anode; and the automatic measurement auxiliary circuit is used for disconnecting the sacrificial anode from the measured pipeline, disconnecting the third relay from the fourth terminal and the fifth terminal, disconnecting the second relay from the intelligent detection system, disconnecting the standard resistance, placing the third reference electrode on the moist soil directly above the sacrificial anode buried position, and ensuring that the bottom of the third reference electrode is in good contact with the ground soil according to the received detection signal. The main control circuit is used for generating a corresponding detection signal when measuring the open circuit potential of the sacrificial anode; and the automatic measurement auxiliary circuit is used for disconnecting the third relay from the fourth terminal and the fifth terminal, disconnecting the standard resistance according to the received detection signal. The main control circuit is used for generating a corresponding detection signal when measuring the output current of the sacrificial anode; and the automatic measurement auxiliary circuit is used for disconnecting the third relay from the third terminal, the fourth terminal and the fifth terminal according to the received detection signal. The device further comprises: The host computer processing system is used for processing the received digital signal and storing; The wireless data transmission module is used for realizing the wireless communication function, and awakening the detection device at a fixed time or remotely.

2. The apparatus of claim 1, wherein, The device further comprises a detection excitation signal acquisition circuit, which is used for inputting a detection excitation signal from the detection device to the automatic measurement auxiliary circuit and triggering the detection pile to start working.

3. The apparatus of claim 1, wherein, The device further comprises a power amplification circuit, which is used for amplifying the detection signal transmitted by the detection pile and transmitting it to the voltage / current / resistance measurement circuit.

4. The apparatus of claim 1, wherein, The reference electrode material adopts a copper / saturated copper sulfate electrode (CSE), which is used as a reference when measuring the potential values of other electrodes.

5. The apparatus of claim 1, wherein, The device further comprises a digital isolation chip, which realizes the isolation between the electronic system and the user, meets the safety regulations, and reduces the noise of the grounding loop.

6. The apparatus of claim 1, wherein, The device further comprises a constant current power supply and a solar circuit board, which are used for powering the device and realizing the long-time working requirement of the detection device. The reference electrode material adopts a copper / saturated copper sulfate electrode (CSE), which is used as a reference when measuring the potential values of other electrodes. The device further comprises a digital isolation chip, which realizes the isolation between the electronic system and the user, meets the safety regulations, and reduces the noise of the grounding loop. The device further comprises a constant current power supply and a solar circuit board, which are used for powering the device and realizing the long-time working requirement of the detection device.

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