An intelligent cathodic protection acquisition device

Abstract

The present invention discloses an intelligent cathodic protection acquisition device, which relates to the technical field of cathodic protection and includes: a voltage sampling module for collecting voltage signals on a pipeline; a current sampling module for collecting current signals on the pipeline; a main control module for receiving the voltage signals and current signals collected by the voltage sampling module and the current sampling module; a first magnification adjustment module for adjusting the sampling range of the voltage sampling module; and a second magnification adjustment module for adjusting the sampling range of the current sampling module. The present invention increases the sampling range of the acquisition device by several orders of magnitude compared with existing products. At the same time, a lightning protection circuit is added at the front end of the sampling circuit, which can effectively prevent lightning strikes and greatly improve the reliability of the device.

Description

Technical Field

[0001] The present invention relates to the technical field of cathodic protection, and particularly to an intelligent cathodic protection acquisition device. Background Art

[0002] The cathodic protection test pile is an essential device in the cathodic protection system of long-distance pipelines, mainly used for detecting the cathodic protection effect and operating parameters of pipelines. For the traditional cathodic protection test pile to detect parameters, maintenance personnel need to carry measuring instruments such as multimeters to the installation location of the test pile for on-site measurement operations to obtain relevant parameters. This process is time-consuming and laborious, and the accuracy cannot be guaranteed, and it is difficult to achieve statistical analysis of historical data.

[0003] Currently, there are already some intelligent cathodic protection test piles. Their built-in control circuits and wireless transmission devices can achieve remote data measurement and transmission, greatly saving labor costs and improving data accuracy. However, for the existing intelligent test piles, the measurement range of the parameters they measure is limited and cannot fully cover the parameter range to be detected, and they cannot effectively monitor the cathodic protection status of pipelines. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an intelligent cathodic protection acquisition device.

[0005] To solve the above technical problems, the technical solution of the present invention is as follows:

[0006] An intelligent cathodic protection acquisition device, comprising:

[0007] A voltage sampling module for collecting voltage signals on the pipeline;

[0008] A current sampling module for collecting current signals on the pipeline;

[0009] A main control module for receiving the voltage signals and current signals collected by the voltage sampling module and the current sampling module;

[0010] A first magnification adjustment module for adjusting the sampling range of the voltage sampling module;

[0011] A second magnification adjustment module for adjusting the sampling range of the current sampling module.

[0012] As a preferred solution of the intelligent cathodic protection acquisition device of the present invention, wherein: the first magnification adjustment module includes a fifth analog switch chip and a sixth analog switch chip,

[0013] The first pin of the fifth analog switch chip is sequentially connected to a sixth resistor with a resistance value of 300 Ω and a seventh resistor with a resistance value of 4700 Ω. The first pin of the sixth analog switch chip is connected to an eighth resistor with a resistance value of 20000 Ω. The other end of the seventh resistor is connected in parallel with the other end of the eighth resistor.

[0014] The second pins of the fifth analog switch chip and the sixth analog switch chip are both grounded.

[0015] The fifth pins of the fifth analog switch chip and the sixth analog switch chip are both connected to the power supply.

[0016] The sixth pins of the fifth analog switch chip and the sixth analog switch chip are the ENB terminals of their respective analog switch chips.

[0017] When the ENB terminals of the fifth analog switch chip and the sixth analog switch chip are both at low level, the magnification factor of the first magnification factor adjustment module is 1.

[0018] When the ENB terminal of the fifth analog switch chip is at low level and the ENB terminal of the sixth analog switch chip is at high level, the magnification factor of the first magnification factor adjustment module is 6.

[0019] When the ENB terminal of the fifth analog switch chip is at high level and the ENB terminal of the sixth analog switch chip is at low level, the magnification factor of the first magnification factor adjustment module is 21.

[0020] As a preferred solution of the intelligent cathodic protection acquisition device described in the present invention, wherein: the second magnification factor adjustment module includes a first analog switch chip, a second analog switch chip, a third analog switch chip, and a fourth analog switch chip.

[0021] The first pin of the first analog switch chip is connected to a first resistor with a resistance value of 100 Ω. The first pin of the second analog switch chip is connected to a second resistor with a resistance value of 1000 Ω. The first pin of the third analog switch chip is sequentially connected to a third resistor with a resistance value of 100 Ω and a fourth resistor with a resistance value of 3900 Ω. The first pin of the fourth analog switch chip is connected to a fifth resistor with a resistance value of 10000 Ω. The other end of the first resistor is connected in parallel with the other ends of the second resistor, the fourth resistor, and the fifth resistor.

[0022] The second pins of the first analog switch chip, the second analog switch chip, the third analog switch chip, and the fourth analog switch chip are all grounded.

[0023] The fifth pins of the first analog switch chip, the second analog switch chip, the third analog switch chip, and the fourth analog switch chip are all connected to the power supply.

[0024] The sixth pins of the first analog switch chip, the second analog switch chip, the third analog switch chip and the fourth analog switch chip are all the ENB terminals of the corresponding analog switch chip;

[0025] When the ENB terminals of the first analog switch chip, the second analog switch chip, the third analog switch chip and the fourth analog switch chip are all at low level, the magnification of the first magnification adjustment module is 1;

[0026] When the ENB terminals of the first analog switch chip, the second analog switch chip and the third analog switch chip are all at low level, and the ENB terminal of the fourth analog switch chip is at high level, the magnification of the first magnification adjustment module is 11;

[0027] When the ENB terminals of the first analog switch chip, the second analog switch chip and the fourth analog switch chip are all at low level, and the ENB terminal of the third analog switch chip is at high level, the magnification of the first magnification adjustment module is 26;

[0028] When the ENB terminals of the first analog switch chip, the third analog switch chip and the fourth analog switch chip are all at low level, and the ENB terminal of the second analog switch chip is at high level, the magnification of the first magnification adjustment module is 101;

[0029] When the ENB terminals of the second analog switch chip, the third analog switch chip and the fourth analog switch chip are all at low level, and the ENB terminal of the first analog switch chip is at high level, the magnification of the first magnification adjustment module is 1001.

[0030] As a preferred solution of the intelligent cathodic protection acquisition device of the present invention, wherein: the models of the first analog switch chip, the second analog switch chip, the third analog switch chip, the fourth analog switch chip, the fifth analog switch chip and the sixth analog switch chip are all BL1551B.

[0031] As a preferred solution of the intelligent cathodic protection acquisition device of the present invention, wherein: it further includes a lightning protection module, and the input ends of the voltage sampling module and the current sampling module are both connected to the lightning protection module.

[0032] As a preferred solution of the intelligent cathodic protection acquisition device of the present invention, wherein: the lightning protection module includes a first varistor, a second varistor, a third varistor and a discharge tube;

[0033] The first varistor, discharge tube, and third varistor are connected in series in sequence. The first varistor is connected to the steel pipe sampling access point, the third varistor is connected to the reference sensor, and both ends of the second varistor are respectively connected to the steel pipe sampling access point and the reference sensor.

[0034] As a preferred solution of the intelligent cathodic protection acquisition device of the present invention, further comprising: a first differential amplification module, a second differential amplification module, a first operational amplification module, and a second operational amplification module;

[0035] The output end of the voltage sampling module is connected to the input end of the first differential amplification module, the output end of the first differential amplification module is connected to the input end of the first operational amplification module, the output end of the first operational amplification module is connected to the input end of the main control module, and the output end of the first magnification adjustment module is connected to the input end of the first operational amplification module;

[0036] The output end of the current sampling module is connected to the input end of the second differential amplification module, the output end of the second differential amplification module is connected to the input end of the second operational amplification module, the output end of the second operational amplification module is connected to the input end of the main control module, and the output end of the second magnification adjustment module is connected to the input end of the second operational amplification module.

[0037] As a preferred solution of the intelligent cathodic protection acquisition device of the present invention, further comprising: a crystal oscillator module, a reset module, a battery voltage detection module, a 485 interface module, a 4G module, a FLASH storage module, a FRAM storage module, a clock module, and a Bluetooth module. The crystal oscillator module, reset module, battery voltage detection module, 485 interface module, 4G module, FLASH storage module, FRAM storage module, clock module, and Bluetooth module are all connected to the main control module;

[0038] The crystal oscillator module is used to provide a clock signal for the device to keep each module synchronized;

[0039] The reset module is used to restore the device to the starting state;

[0040] The battery voltage detection module is used to detect the voltage value of the battery of the acquisition device;

[0041] The 485 interface module is used to perform decentralized conversion on the signals obtained at the interface end and convert out multiple signals;

[0042] The 4G module is used for data communication;

[0043] The FLASH storage module is used to perform erasing, writing, and reprogramming on the storage unit;

[0044] The FRAM storage module is used to store data and ensure that the data is not lost after the device loses power.

[0045] The clock module is used to generate specific clock signals to control the operation of the device.

[0046] The Bluetooth module is used for wireless network communication.

[0047] As a preferred solution of the intelligent cathodic protection acquisition device described in the present invention, the master control module is further configured to send AT commands to the Bluetooth module when the Bluetooth module is in an unconnected state, determine whether the Bluetooth module returns data, and determine that the Bluetooth module is faulty when the Bluetooth module does not return data.

[0048] The master control module is also used to write a data to the FLASH storage module or the FRAM storage module, then read out the data, determine whether the read value is consistent with the written value, and determine that the FLASH storage module or the FRAM storage module reads normally when they are consistent.

[0049] The master control module is further used to write a data to the FLASH storage module or the FRAM storage module, and this data is different from the data written last time, then read out the value, determine whether the read value is consistent with the written value, and determine that the FLASH storage module or the FRAM storage module stores normally when they are consistent.

[0050] As a preferred solution of the intelligent cathodic protection acquisition device described in the present invention, the master control module includes a single-chip microcomputer of model msp430.

[0051] The beneficial effects of the present invention are as follows:

[0052] (1) By setting the first magnification adjustment module and the second magnification adjustment module, the sampling ranges of voltage and current are adjustable to meet the measurement requirements of different working conditions.

[0053] (2) By adding a lightning protection module at the front end of the current sampling module and the voltage sampling module, the lightning protection effect can be effectively achieved, and the reliability of the device is greatly improved.

[0054] (3) The present invention has the functions of self-fault detection and remote program upgrade, effectively reducing the maintenance cost after the product is installed. Description of the Drawings

[0055] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0056] Figure 1 Schematic diagram of the structure of the intelligent cathodic protection acquisition device provided by the present invention;

[0057] Figure 2 Schematic diagram of the circuit of the first magnification adjustment module in the intelligent cathodic protection acquisition device provided by the present invention;

[0058] Figure 3 Schematic diagram of the circuit of the second magnification adjustment module in the intelligent cathodic protection acquisition device provided by the present invention;

[0059] Figure 4 Schematic diagram of the circuit of the lightning protection module in the intelligent cathodic protection acquisition device provided by the present invention;

[0060] Figure 5 Schematic diagram of the flow of the method for upgrading the program of the intelligent cathodic protection acquisition device provided by the present invention; Detailed implementation manners

[0061] To make the content of the present invention easier to be clearly understood, the following will further elaborate on the present invention according to the detailed implementation manners in combination with the drawings.

[0062] Figure 1 Schematic diagram of the structure of the intelligent cathodic protection acquisition device provided by the embodiments of the present application. The device includes a voltage sampling module, a current sampling module, a first differential amplification module, a second differential amplification module, a first operational amplification module, a second operational amplification module, a first magnification adjustment module, a second magnification adjustment module, a lightning protection module, a crystal oscillator module, a reset module, a battery voltage detection module, a 485 interface module, a 4G module, a FLASH storage module, a FRAM storage module, a clock module, a Bluetooth module, and a main control module.

[0063] Among them, the input end of the voltage sampling module is connected to the voltage sampling point on the steel pipe, the output end of the voltage sampling module is connected to the input end of the first differential amplification module, the output end of the first differential amplification module is connected to the input end of the first operational amplification module, and the output end of the first operational amplification module is connected to the input end of the main control module. The voltage sampling module is used to collect the voltage signal on the pipeline, and sequentially transmit the voltage signal to the first differential amplification module and the first operational amplification module for processing, and transmit the processed signal to the main control module.

[0064] Preferably, the input end of the first operational amplifier module is also connected to a first magnification adjustment module. The first magnification adjustment module is used to adjust the sampling range of the voltage sampling module.

[0065] See Figure 2 , the above-mentioned first magnification adjustment module includes a fifth analog switch chip U20 and a sixth analog switch chip U22. Among them, the first pin of the fifth analog switch chip U20 is sequentially connected to a sixth resistor R58 with a resistance value of 300Ω and a seventh resistor R57 with a resistance value of 4700Ω. The first pin of the sixth analog switch chip U22 is connected to an eighth resistor R59 with a resistance value of 20000Ω. The other end of the seventh resistor R57 is connected in parallel with the other end of the eighth resistor R59. The second pins of the fifth analog switch chip U20 and the sixth analog switch chip U22 are both grounded. The fourth pins of the fifth analog switch chip U20 and the sixth analog switch chip U22 are both the access positions of the amplification resistors. The fifth pins of the fifth analog switch chip U20 and the sixth analog switch chip U22 are both connected to the power supply VCC. The sixth pins of the fifth analog switch chip U20 and the sixth analog switch chip U22 are both the ENB terminals of the respective analog switch chips.

[0066] When the ENB terminals of both the fifth analog switch chip U20 and the sixth analog switch chip U22 are at low level, the magnification of the first magnification adjustment module is 1; when the ENB terminal of the fifth analog switch chip U20 is at low level and the ENB terminal of the sixth analog switch chip U22 is at high level, the magnification of the first magnification adjustment module is 6; when the ENB terminal of the fifth analog switch chip U20 is at high level and the ENB terminal of the sixth analog switch chip U22 is at low level, the magnification of the first magnification adjustment module is 21. Through the above different control methods, the sampling range of the voltage can be adjusted to meet the measurement requirements of different working conditions.

[0067] The input end of the current sampling module is connected to the current sampling point on the steel pipe. The output end of the current sampling module is connected to the input end of the second differential amplification module. The output end of the second differential amplification module is connected to the input end of the second operational amplifier module. The output end of the second operational amplifier module is connected to the input end of the main control module. The current sampling module is used to collect the current signal on the pipeline and transmit the current signal to the second differential amplification module and the second operational amplifier module for processing in sequence, and transmit the processed signal to the main control module.

[0068] Preferably, the input end of the second operational amplifier module is also connected to a second magnification adjustment module. The second magnification adjustment module is used to adjust the sampling range of the current sampling module.

[0069] See Figure 3, the second magnification adjustment module described above includes a first analog switch chip U29, a second analog switch chip U30, a third analog switch chip U31, and a fourth analog switch chip U32. Among them, the first pin of the first analog switch chip U29 is connected to a first resistor R70 with a resistance value of 100 Ω, the first pin of the second analog switch chip U30 is connected to a second resistor R71 with a resistance value of 1000 Ω, the first pin of the third analog switch chip U31 is sequentially connected to a third resistor R73 with a resistance value of 100 Ω and a fourth resistor R72 with a resistance value of 3900 Ω, and the first pin of the fourth analog switch chip U32 is connected to a fifth resistor R74 with a resistance value of 10000 Ω. The other ends of the first resistor R70, the second resistor R71, the fourth resistor R72, and the fifth resistor R74 are connected in parallel. The second pins of the first analog switch chip U29, the second analog switch chip U30, the third analog switch chip U31, and the fourth analog switch chip U32 are all grounded. The fourth pins of the first analog switch chip U29, the second analog switch chip U30, the third analog switch chip U31, and the fourth analog switch chip U32 are all the access positions of the amplification resistors. The fifth pins of the first analog switch chip U29, the second analog switch chip U30, the third analog switch chip U31, and the fourth analog switch chip U32 are all connected to the power supply VCC. The sixth pins of the first analog switch chip U29, the second analog switch chip U30, the third analog switch chip U31, and the fourth analog switch chip U32 are all the ENB terminals of the corresponding analog switch chips.

[0070] When the ENB terminals of the first analog switch chip U29, the second analog switch chip U30, the third analog switch chip U31, and the fourth analog switch chip U32 are all at low level, the magnification of the first magnification adjustment module is 1; when the ENB terminals of the first analog switch chip U29, the second analog switch chip U30, and the third analog switch chip U31 are all at low level, and the ENB terminal of the fourth analog switch chip U32 is at high level, the magnification of the first magnification adjustment module is 11; when the ENB terminals of the first analog switch chip U29, the second analog switch chip U30, and the fourth analog switch chip U32 are all at low level, and the ENB terminal of the third analog switch chip U31 is at high level, the magnification of the first magnification adjustment module is 26; when the ENB terminals of the first analog switch chip U29, the third analog switch chip U31, and the fourth analog switch chip U32 are all at low level, and the ENB terminal of the second analog switch chip U30 is at high level, the magnification of the first magnification adjustment module is 101; when the ENB terminals of the second analog switch chip U30, the third analog switch chip U31, and the fourth analog switch chip U32 are all at low level, and the ENB terminal of the first analog switch chip U29 is at high level, the magnification of the first magnification adjustment module is 1001. Through the above different control methods, the sampling range of the current can be adjusted to meet the measurement requirements of different working conditions.

[0071] Among them, the models of the first analog switch chip, the second analog switch chip, the third analog switch chip, the fourth analog switch chip, the fifth analog switch chip, and the sixth analog switch chip are all BL1551B.

[0072] Preferably, the input ends of the voltage sampling module and the current sampling module are both connected to the lightning protection module. Refer to Figure 4 , the above lightning protection module includes a first varistor RV1, a second varistor RV2, a third varistor RV3, and a discharge tube T1. Among them, the first varistor RV1, the discharge tube T1, and the third varistor RV3 are connected in series in sequence, and the first varistor RV1 is connected to the steel pipe sampling access point (i.e., the GANGGUAN connection point in the attached drawing), and the third varistor RV3 is connected to the reference sensor access point (i.e., the CANBI connection point in the attached drawing). Both ends of the second varistor RV2 are respectively connected to the steel pipe sampling access point and the reference sensor access point. When the device is in a normal state, the first varistor RV1, the third varistor RV3, and the discharge tube T1 are disconnected. When the device is struck by lightning, excessive voltage and current will be generated at the steel pipe sampling access point (i.e., the GANGGUAN connection point in the attached drawing) and the reference sensor access point (i.e., the CANBI connection point in the attached drawing). 1 (the first varistor RV1), 3 (the third varistor RV3) are connected to 2 (PGND), and the voltage and current are discharged into the ground through 2 (PGND), playing a protective role for the device.

[0073] Among them, the model of the discharge tube adopted in this embodiment is 3RM350L-8.

[0074] The above crystal oscillator module, reset module, battery voltage detection module, 485 interface module, 4G module, FLASH storage module, FRAM storage module, clock module and Bluetooth module are all connected to the main control module.

[0075] Among them, the crystal oscillator module is used to provide a basic clock signal for the acquisition device to keep each module synchronized. The reset module is used to restore the acquisition device to the starting state, and it can be manually reset or automatically reset. The battery voltage detection module is used to detect the voltage value of the battery of the acquisition device, and a voltage threshold can be preset in the main control module. When the detected voltage value is lower than the preset voltage threshold, the main control module can control the alarm module connected thereto to give an alarm. The 485 interface module is used to disperse and convert the signals obtained at the interface end and convert out multiple signals. At the same time, it can also realize the conversion of multiple signals. The 4G module is used for data communication. The FLASH storage module is used to erase, write and reprogram the storage unit. The FRAM storage module is used to store data and ensure that the data is not lost after the device loses power. The clock module is used to generate a specific clock signal to control the operation of the device and improve the accuracy and reliability of the acquisition device. The clock circuit is powered by a button battery. The Bluetooth module is used for wireless network communication, and a Bluetooth wake-up module is also connected thereto, which is used to wake up the above Bluetooth module.

[0076] See Figure 5 , the above intelligent cathodic protection acquisition device adopts a program upgrade method of actively requesting a program package, and the specific process is as follows:

[0077] Step S101: The upper computer issues an upgrade notice to inform the device that there is a new upgrade package to be upgraded.

[0078] Step S102: The device actively requests the program package when the communication is normal and idle, and performs verification.

[0079] Step S103: When the program package request is completed, the upgrade is automatically performed.

[0080] In addition, in order to reduce the difficulty of troubleshooting and quickly judge the cause of the fault, the device itself has added a fault detection and fault recording function, and the device automatically performs a full inspection of the device every 24 hours and when the device is idle. The main fault functions detected by the device include data communication, signal acquisition and data storage, which are specifically as follows:

[0081] 1) Data communication: Bluetooth communication (Bluetooth fault), NET communication (module fault, card fault, network fault, server fault).

[0082] 2) Signal acquisition: Battery voltage (undervoltage), acquisition module (abnormal acquisition signal).

[0083] 3) Data storage: EEPROM (access failure), FLASH (access failure).

[0084] The fault detection methods are as follows:

[0085] Bluetooth fault detection method: The main control module ensures that the Bluetooth is in an unconnected state (detect whether the LINK pin is at low level, and low level means unconnected). At this time, send an AT command to the Bluetooth. If the Bluetooth does not return data, it is determined that there is a fault in the Bluetooth part.

[0086] NET communication - Module fault detection method: Normally open the network communication module and send an AT command. If the module returns OK, it is considered that the module is normal;

[0087] NET communication - Card fault detection method: In the case of establishing communication with the network communication module, send a card detection command. If OK is returned, it is considered that the card is normal;

[0088] NET communication - Network fault detection method: The acquisition device attempts to connect to the network. When the network signal value is lower than the set value and it cannot register on the network for a long time, it is judged as a network fault;

[0089] NET communication - Server fault detection method: If the acquisition device cannot connect to the server or cannot receive the data returned by the server after connecting to the server, it is judged as a server fault.

[0090] The main control module writes a data to the FLASH storage module or the FRAM storage module, and then reads out the data. Because the write address is fixed, it cannot be excluded that this value was written during previous tests. If the read value is the same as the written value, it can only be determined that the memory reading is normal. The main control module then writes a data to the FLASH storage module or the FRAM storage module, and this data is different from the data written last time (for example: 0x11 0x12 0x13), and then reads out the value. If the read value is consistent with the written value, it can be determined that the FLASH storage module or the FRAM storage module stores normally.

[0091] Thus, the technical solution of this application increases the sampling range of the acquisition device by several orders of magnitude compared with existing products. At the same time, a lightning protection circuit is added at the front end of the sampling circuit, which can effectively prevent lightning and greatly improve the reliability of the device.

[0092] In addition to the above embodiments, the present invention may have other embodiments; all technical solutions formed by equivalent replacement or equivalent transformation fall within the protection scope required by the present invention.

Claims

1. An intelligent cathodic protection data acquisition device, characterized in that: include: Voltage sampling module, used to collect voltage signals on the pipeline; Current sampling module, used to collect current signals on the pipeline; A main control module, configured to receive the voltage signal and the current signal collected by the voltage sampling module and the current sampling module; A first magnification adjustment module, configured to adjust the sampling range of the voltage sampling module; A second magnification adjustment module, used to adjust the sampling range of the current sampling module; The system further includes a first differential amplifier module, a second differential amplifier module, a first operational amplifier module, and a second operational amplifier module. The output end of the voltage sampling module is connected to the input end of the first differential amplifier module, the output end of the first differential amplifier module is connected to the input end of the first operational amplifier module, the output end of the first operational amplifier module is connected to the input end of the main control module, and the output end of the first amplification ratio adjustment module is connected to the input end of the first operational amplifier module; the output end of the current sampling module is connected to the input end of the second differential amplifier module, the output end of the second differential amplifier module is connected to the input end of the second operational amplifier module, the output end of the second operational amplifier module is connected to the input end of the main control module, and the output end of the second amplification ratio adjustment module is connected to the input end of the second operational amplifier module; The first amplification adjustment module includes a fifth analog switch chip and a sixth analog switch chip, wherein a first pin of the fifth analog switch chip is connected to a sixth resistor having a resistance of 300Ω and a seventh resistor having a resistance of 4700Ω in sequence, a first pin of the sixth analog switch chip is connected to an eighth resistor having a resistance of 20000Ω, and the other end of the seventh resistor is connected in parallel with the other end of the eighth resistor; The second amplification adjustment module includes a first analog switch chip, a second analog switch chip, a third analog switch chip and a fourth analog switch chip. The first pin of the first analog switch chip is connected to a first resistor with a resistance of 100Ω, the first pin of the second analog switch chip is connected to a second resistor with a resistance of 1000Ω, the first pin of the third analog switch chip is connected to a third resistor with a resistance of 100Ω and a fourth resistor with a resistance of 3900Ω in sequence, the first pin of the fourth analog switch chip is connected to a fifth resistor with a resistance of 10000Ω, and the first resistor is connected in parallel with the other ends of the second resistor, the fourth resistor and the fifth resistor.

2. The intelligent cathodic protection data acquisition device according to claim 1, characterized in that: The second pins of the fifth analog switch chip and the sixth analog switch chip are both grounded; The fifth pins of the fifth analog switch chip and the sixth analog switch chip are both connected to the power supply; The sixth pins of the fifth analog switch chip and the sixth analog switch chip are both ENB terminals of the analog switch chips; When the ENB terminals of the fifth analog switch chip and the sixth analog switch chip are both at a low level, the amplification factor of the first amplification factor adjustment module is 1; When the ENB terminal of the fifth analog switch chip is at a low level and the ENB terminal of the sixth analog switch chip is at a high level, the amplification factor of the first amplification factor adjustment module is 6; When the ENB terminal of the fifth analog switch chip is at a high level and the ENB terminal of the sixth analog switch chip is at a low level, the amplification factor of the first amplification factor adjustment module is 21.

3. The intelligent cathodic protection data acquisition device according to claim 2, characterized in that: The second pins of the first analog switch chip, the second analog switch chip, the third analog switch chip and the fourth analog switch chip are all grounded; The fifth pins of the first analog switch chip, the second analog switch chip, the third analog switch chip and the fourth analog switch chip are all connected to a power supply; The sixth pins of the first analog switch chip, the second analog switch chip, the third analog switch chip and the fourth analog switch chip are all ENB terminals of the analog switch chips; When the ENB terminals of the first analog switch chip, the second analog switch chip, the third analog switch chip, and the fourth analog switch chip are all at low levels, the amplification factor of the first amplification factor adjustment module is 1; When the ENB terminals of the first analog switch chip, the second analog switch chip, and the third analog switch chip are all at a low level, and the ENB terminal of the fourth analog switch chip is at a high level, the amplification factor of the first amplification factor adjustment module is 11; When the ENB terminals of the first analog switch chip, the second analog switch chip, and the fourth analog switch chip are all at a low level, and the ENB terminal of the third analog switch chip is at a high level, the amplification factor of the first amplification factor adjustment module is 26; When the ENB terminals of the first analog switch chip, the third analog switch chip, and the fourth analog switch chip are all at a low level, and the ENB terminal of the second analog switch chip is at a high level, the amplification factor of the first amplification factor adjustment module is 101; When the ENB terminals of the second analog switch chip, the third analog switch chip, and the fourth analog switch chip are all at a low level and the ENB terminal of the first analog switch chip is at a high level, the amplification factor of the first amplification factor adjustment module is 1001.

4. The intelligent cathodic protection data acquisition device according to claim 3, characterized in that: The models of the first analog switch chip, the second analog switch chip, the third analog switch chip, the fourth analog switch chip, the fifth analog switch chip and the sixth analog switch chip are all BL1551B.

5. The intelligent cathodic protection data acquisition device according to claim 1, characterized in that: It also includes a lightning protection module, and the input ends of the voltage sampling module and the current sampling module are both connected to the lightning protection module.

6. The intelligent cathodic protection data acquisition device according to claim 5, characterized in that: The lightning protection module includes a first varistor, a second varistor, a third varistor and a discharge tube; The first varistor, the discharge tube and the third varistor are connected in series in sequence, and the first varistor is connected to the steel pipe sampling access point, the third varistor is connected to the reference sensor, and the two ends of the second varistor are respectively connected to the steel pipe sampling access point and the reference sensor.

7. The intelligent cathodic protection data collection device according to claim 1, characterized in that: It also includes a crystal oscillator module, a reset module, a battery voltage detection module, a 485 interface module, a 4G module, a FLASH storage module, a FRAM storage module, a clock module and a Bluetooth module, and the crystal oscillator module, the reset module, the battery voltage detection module, the 485 interface module, the 4G module, the FLASH storage module, the FRAM storage module, the clock module and the Bluetooth module are all connected to the main control module; The crystal oscillator module is used to provide a clock signal for the device to keep each module synchronized; The reset module is used to restore the device to an initial state; The battery voltage detection module is used to detect the voltage value of the battery of the acquisition device; The 485 interface module is used to perform decentralized conversion on the signal obtained by the interface end and convert it into multiple signals; The 4G module is used for data communication; The FLASH storage module is used to erase and reprogram the storage unit; The FRAM storage module is used to store data and ensure that the data is not lost after the device loses power; The clock module is used to generate a specific clock signal to control the operation of the device; The Bluetooth module is used for wireless network communication.

8. The intelligent cathodic protection data collection device according to claim 7, characterized in that: The main control module is further used to send an AT command to the Bluetooth module when the Bluetooth module is in an unconnected state, and to determine whether the Bluetooth module returns data, and to determine that the Bluetooth module is faulty if the Bluetooth module does not return data; The main control module is further configured to write data to the FLASH storage module or the FRAM storage module, and then read the data out, determine whether the read value is consistent with the written value, and if consistent, determine that the FLASH storage module or the FRAM storage module is reading normally; The main control module is also used to write data to the FLASH storage module or the FRAM storage module again, and the data is different from the data written last time, and then read the value out to determine whether the read value is consistent with the written value, and if they are consistent, it is determined that the storage of the FLASH storage module or the FRAM storage module is normal.

9. The intelligent cathodic protection data collection device according to claim 1, characterized in that: The main control module includes a single chip microcomputer of model msp430.

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