CN219084807U

CN219084807U - Multifunctional detection device

Info

Publication number: CN219084807U
Application number: CN202222854415.8U
Authority: CN
Inventors: 陆登; 陈中官; 曾祺; 周英辉; 严伟丽
Original assignee: Sinopec Zhenhai Refining & Chemical Co; China Petroleum and Chemical Corp
Current assignee: Sinopec Zhenhai Refining & Chemical Co; China Petroleum and Chemical Corp
Priority date: 2022-10-28
Filing date: 2022-10-28
Publication date: 2023-05-26
Anticipated expiration: 2032-10-28

Abstract

The embodiment of the utility model provides a multifunctional detection device, and belongs to the field of intelligent detection. The multifunctional detection device comprises: the main board comprises a sampling module group, a display screen, a functional knob, keys and a connecting terminal; the control panel is used for covering and protecting elements on the main board, and fixing and exposing the display screen, the function knob, the keys and the connecting terminals; the battery bin is used for fixing the battery pack; the sampling module group comprises one or more of an electrified potential sampling module, a powered-off potential sampling module, a direct current stray current sampling module and an alternating current stray current sampling module; the function knob is used for selecting a sampling mode to be used for current detection, and the sampling mode corresponds to a sampling module in the sampling module group; the battery pack is used for supplying power to the main board; the connecting terminal is used for receiving the detection equipment through the connecting wire. The utility model also supports local storage and cloud storage of detection data, has high integration level and is convenient to detect and carry.

Description

Multifunctional detection device

Technical Field

The utility model relates to the field of intelligent detection, in particular to a multifunctional detection device.

Background

The pipeline corrosion prevention detection work relates to the tasks of buried pipeline stray current detection, outage test detection, yin-retention effectiveness evaluation and the like, wherein when detecting a plurality of conventional cathode protection data of an electrified potential, an outage potential, an alternating current stray current and a direct current stray current, a plurality of instruments are required to be matched, especially in the process of measuring the outage potential, the actual outage potential can be measured only by interrupting the protection current, the instruments cannot store the measured data, the measured data are required to be manually recorded, and a history curve is manually drawn, so that a great amount of workload is brought to corrosion prevention engineers. Where the testing of stray currents often requires continuous measurement for 24 hours, creating a huge amount of data with more storage and handling problems.

The inventor finds that in the process of realizing the utility model, the currently available detection equipment has low integration level, large volume, inconvenient installation and carrying and low endurance capacity, and can not meet the requirement of simultaneously detecting more data and sampling operation at long and controllable time intervals.

Disclosure of Invention

The embodiment of the utility model aims to provide an intelligent detection device which provides intelligent multifunctional detection equipment to solve the technical problems that the integration level of the detection equipment is not high, the use is inconvenient, and more data cannot be detected for a long time.

In order to achieve the above object, an embodiment of the present utility model provides a multifunctional detecting device, including: the main board comprises a sampling module group, a display screen, a functional knob, keys and a connecting terminal; the control panel is used for covering and protecting elements on the main board and fixing and exposing the display screen, the functional knob, the keys and the connecting terminals; the battery bin is used for fixing the battery pack; the sampling module group comprises one or more of an electrified potential sampling module, a powered-off potential sampling module, a direct current stray current sampling module and an alternating current stray current sampling module; the function knob is used for selecting a sampling mode to be used for current detection, and the sampling mode corresponds to a sampling module in the sampling module group; the battery pack is used for supplying power to the main board; the connecting terminal is used for receiving the detection equipment through a connecting wire.

Further, the multifunctional detection device also comprises a communication board, which is used for receiving the sampling data obtained by the acquisition module and transmitting the sampling data to a remote upper computer; the main board also comprises a NET connection indicator lamp which is used for displaying the connection state of the communication board and the remote upper computer; the battery pack is also used for supplying power to the communication board.

Preferably, the keys of the main board comprise a remote control key and a local storage key; when the remote control key is pressed, the main board controls the communication board to transmit the sampling data to the remote upper computer; when the local save key is pressed, the main board stores the sampling data in a local memory.

Further, when the detection is continuously performed or the power-off detection is performed, the main board controls the communication board to transmit the sampling data to the remote upper computer no matter whether the remote control key and/or the local storage key are pressed or not.

Optionally, the manner of transmitting the data from the communication board to the remote upper computer includes one or more of 4G, 5G, bluetooth, and USB.

Preferably, the multifunctional detection device further comprises a battery protection board, which is electrically connected with the main board and used for charging protection of the battery pack; the battery pack is electrically connected with the battery protection plate.

Further, the multifunctional detection device further comprises a shell, wherein the shell is used for accommodating and fixing the main board, the control panel, the communication board and the battery bin; the control panel is fixed on the shell through a panel bracket and/or a set screw.

Optionally, the control panel is an insulating plate with a preformed hole slot; the main board is fixed below the control panel, and the display screen, the function knob, the keys and the connecting terminals can be exposed through the reserved empty slots of the control panel; the communication board is in data connection with the main board, and is connected with the NET through an external communication display line so as to display the connection state of the integrated machine and the remote upper computer.

Preferably, the power-off potential sampling module is a circuit for controlling the electrification of a test piece of the polarization probe by driving the relay to be switched on and off through the control module.

Preferably, the keys of the main board comprise a time setting key and a start and stop key; the time setting key corresponds to a time setting display screen and is used for setting a sampling time period for the sampling modes respectively, and the current sampling mode and/or the sampling time period are displayed through the time setting display screen; the starting key is used for starting detection; the stop button is used for stopping detection; and the display screen of the main board also comprises a data display screen for displaying the sampling data after the detection is started.

Preferably, the connection terminal of the main board is a quick-plug terminal.

Optionally, the equipment to be detected is a petroleum pipeline and/or a test pile.

Further, the connecting terminal is connected with the test pile and/or the pipeline to be measured through a pluggable connecting wire, wherein the connecting wire is connected with the test pile and/or the pipeline to be measured through an alligator head terminal.

Further, the connection terminal of the main board comprises a power input terminal and a data access terminal; the power input terminal can be connected with an external power supply to charge the battery; the data access terminals are four, and are respectively connected with the reference electrode, the pipeline, the test piece I and the test piece II.

Through the technical scheme, the sampling module group can provide power-on potential sampling, power-off potential sampling, direct current stray current sampling and alternating current stray current sampling, so that comprehensive data detection and comprehensive analysis are realized; the rationalization algorithm of the power-off potential module obtains the real power-off potential under the condition of no need of interrupting the protection current; the parasitic current sampling detection module can continuously sample and detect and transmit data for 24 hours under the condition of power supply of the battery pack; the main board and the communication board are combined to realize local and cloud storage of detection data, realize multi-style uploading of the data, and also can support drawing of an operation curve of the data directly at the cloud and timely analysis of problems; the multifunctional detection device integrally realizes the integration of detection tools, reduces the workload of detection engineers, and is suitable for carrying with people during field work.

Additional features and advantages of embodiments of the utility model will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain, without limitation, the embodiments of the utility model. In the drawings:

FIG. 1A is a schematic view of an embodiment of the present utility model;

FIG. 1B is a top view of a machine and stand according to an embodiment of the present utility model;

FIG. 1C is a top view of a housing of an embodiment of the present utility model;

FIG. 1D is a view of a panel mount according to an embodiment of the present utility model;

FIG. 2 is an exploded view of an embodiment of the present utility model;

FIG. 3 is a schematic view of an operation panel according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a motherboard according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of a communication board according to an embodiment of the utility model;

fig. 6 is a schematic view of a battery protection plate according to an embodiment of the present utility model;

FIG. 7 is a schematic view of a battery compartment connection of an embodiment of the present utility model;

FIGS. 8A-C are schematic diagrams of collected data connections according to an embodiment of the utility model;

FIG. 9 is a flow chart of the operation of an embodiment of the present utility model;

FIG. 10A is a circuit diagram of a power-on potential sampling module according to an embodiment of the present utility model;

FIG. 10B is a circuit diagram of a power down potential sampling module according to an embodiment of the present utility model;

FIG. 10C is a circuit diagram of a stray current sampling module according to an embodiment of the utility model;

FIG. 11 is a graph of depolarization after power down for an embodiment of the present utility model; and

FIG. 12 is a diagram of power down utilization test data for one embodiment of the present utility model.

Description of the reference numerals

100 a multifunctional detection device; 104 a communication board;

a 101 housing cover; 105 plate frames;

102, a main board; 106 a battery;

103 a battery protection plate; 107 a housing body;

1, a panel; 2 a function selection knob;

3, remote transmission control keys; 4, storing the local key;

starting a key; 6, stopping pressing a key;

7NET digital lamps; 8, a data display screen;

9, setting a display screen for time; 10 time setting keys;

11 charging holes; 12 meter pen insertion hole-reference electrode;

13, the pen insertion hole-pipeline is connected with zero; 14 meter pen insertion hole-test piece I;

15 meter pen insertion hole-test piece II; a 16USB communication interface;

17 a device power-on button; 18 a data access terminal;

19 a power supply input terminal; 20 mainboards;

21 data display liquid crystal screen; 22. 23 data pin-arranging;

24 time setting display liquid crystal screen; 25USB communication interface;

26 time setting keys; 27 function selection knob terminals;

28 remote/save local terminals; 29 start/stop terminals;

30 antenna interfaces; 31 data communication pin header;

32 communication boards; 33 battery charging ports;

34 a battery protection plate; 35 power supply output port;

36 battery input port; 37 power output control ports;

38 battery packs; and 39 battery pack output terminals.

Detailed Description

The following describes the detailed implementation of the embodiments of the present utility model with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the utility model, are not intended to limit the utility model.

The embodiment of the utility model relates to an intelligent multifunctional detection integrated machine for cathode protection, which comprises a detection machine shell, a control panel, a main board, a communication board, a battery compartment, a battery protection board and a connecting wire.

The appearance and the internal structure of the present embodiment can be shown in fig. 1A-1D, which are respectively an appearance schematic diagram, a top view of the machine and the bracket, a top view of the housing, and a schematic diagram of the control panel fixing bracket. Wherein, as shown in FIG. 1A, the whole is a seal box structure; the panel is fixed on the box body through a panel bracket as shown in fig. 1B; as shown in fig. 1C, the bottom is a battery compartment and connecting wires; the control panel fixing bracket shown in fig. 1D is fixed to the panel by a set screw and then put into the body of the integrated machine.

As shown in fig. 2, the explosion diagram of the present embodiment includes, from top to bottom, a housing cover 101, a main board 102, a battery protection board 103, a communication board 104, a board frame 105, a battery 106, and a housing main body 107 of the main body. The

housings

101 and 107 of the integrated machine are of a closed sealed cabin structure, and positioning screw holes capable of being fixed are formed at the edges of the hatch. The control panel (not shown) is an insulating plate with a hole in advance, a PVC film is stuck on the insulating plate, and the insulating plate is fixed on a shell of the integrated machine through a set screw, so that control and display functions are realized. The main board 102 is a main functional module of the integrated machine, is fixed on the control panel through four set screws, two display screens are arranged on the main board 102, reserved holes are exposed through the panel, 6 time setting keys are arranged on the lower portion of the main board, and reserved holes are exposed from the panel through the panel, so that the operation is convenient. The communication board 104 is fixed on the bottom side of the main board 102 through four set screws, and completes the operation of power supply and communication with the main board 102 through the data pins on the upper part, and is provided with a communication display line which is connected with the NET of the panel to display whether the integrated machine is connected with the upper computer. The battery compartment is mounted at the bottom of the housing of the integrated machine by four set screws for receiving the battery 106. The battery protection board 103 is fixed on the left side of the main board 102 through four set screws, and is used for completing the charge protection of the battery and the overall power supply of the integrated machine. The connecting wire is pluggable, one end is a quick-plug terminal and corresponds to the jack of the panel, and the other end is an crocodile head terminal and is connected with a test pile and a pipeline to be measured.

The above embodiment is further modified to provide another embodiment of the present utility model for use in a field implementation environment.

In this embodiment, for convenience of measurement, the connection wire preferably uses a quick connection plug and an alligator clip.

In order to meet the severe environment of field test, the housing preferably adopts a rainproof and dustproof sealing box.

In this embodiment, for convenient maintenance, the casing and the panel are preferably connected by four electric potential screws, so that the casing and the panel are convenient to detach.

In this embodiment, for convenience in measurement, the main board, the communication board, and the battery protection board are all fixed below the control panel of the integrated machine.

In this embodiment, for facilitating communication, the communication board preferably employs a 4G/5G module, so that real-time communication can be realized.

In this embodiment, for convenience in use in the field when no network is available, the bluetooth module and the USB module are added to the motherboard.

The embodiment provides charging convenience, and the battery protection board provides a direct current 12v charging function and plays a role in protecting the battery from overcurrent and overvoltage.

In this embodiment, in order to satisfy the extra-long endurance in the power-off sampling mode, the electrical output end of the power module is electrically connected with the electrical input end of the bluetooth module, and the rechargeable battery capacity in the power bin is set to 20000mAh.

In this embodiment, for facilitating data acquisition, an electrical output end of the acquisition module is electrically connected with an electrical potential channel, and an electrical output end of the acquisition module is electrically connected with an electrical potential channel.

In this embodiment, for convenience in collecting multiple data, the electrical output end of the collecting module is electrically connected with a dc stray current channel, and the electrical output end of the collecting module is electrically connected with an ac stray voltage channel.

A schematic view of the operation panel of the present embodiment can be seen in fig. 3. Wherein, all-in-one panel 1 is 2mm thick insulation board, has the PVC facial mask above, fixes in the seal box body through the panel support, opens the hole at the panel so that components such as corresponding knob, button and display screen expose on the mainboard.

After the machine is started, four different sampling modes of power-on potential, power-off potential, direct current stray current and alternating current stray current can be selected through the function selection knob 2. It is to be understood that the present utility model is not limited thereto, and other sampling modes may be implemented by adding or replacing sampling modules, which will not be described in detail herein.

By selectively pressing the remote control button 3 or the local save button 4, the sampled data can be selected for uploading to an upper computer or local save. When the remote control key 3 is pressed, the communication board 104 is connected to the upper computer in the cloud, and the NET digital lamp 7 is normally on at this time, which indicates that the communication board 104 is started and the local computer is in the remote connection state.

Pressing the start button 5 or the stop button 6 may start or stop the sampling.

The control panel is also provided with a data display screen 8, a time setting display screen 9, a time setting key 10, a charging hole 11 (the embodiment adopts a 12V battery for charging but the utility model is not limited to the charging), a meter pen inserting hole-a reference electrode 12, a meter pen inserting hole-a pipeline zero receiving hole 13, a meter pen inserting hole-a test piece I14, a meter pen inserting hole-a test piece II 15, a USB communication interface 16 and an equipment starting button 17.

It can be understood that the control panel body is an insulating board with holes for components such as a knob, a key, an indicator light and the like provided for the main board 102, the communication board 104 and the like, is an operation and display interface of the machine, and also plays a role in protecting the main board and the communication board, but the functions of the knob, the key, the indicator light and the like are realized by components such as the main board 102, the communication board 104 and the like.

Fig. 4 is a schematic diagram illustrating the arrangement of components of the motherboard 102 according to the present embodiment. The main board is fixed on the control panel 1 through four corner positioning studs. The main board firstly collects information on the function selection switch 2 on the control panel 1 through the function selection knob terminal 27, and then performs corresponding operation through internal processing. When the remote/save local terminal 28 selects remote transmission, the communication board 104 is started to connect with the cloud-end upper computer, and the data collected through the data access terminal 30 is uploaded to the cloud-end upper computer. When the remote/save local terminal 28 selects the save local, the data collected through the data access terminal 30 is saved in the memory of the host and displayed through the data display liquid crystal screen 21, wherein the time information such as the sampling time, the time interval, etc. is set by the time setting key 26 and displayed through the time setting display screen 24.

The data access terminal 18 on the main board corresponds to the meter pen insertion hole of the control panel, namely the reference electrode 12, the meter pen insertion hole, the pipeline zero connection 13, the meter pen insertion hole, namely the test piece one 14 and the meter pen insertion hole, namely the test piece two 15. The power input terminal 19 is connected to the power output terminal 34 of the power protection board.

The data display liquid crystal screen 21 is fixed on the main board 20 by four set screws and communication pins 22.

The time setting display liquid crystal screen 24 is fixed on the main board 20 through four set screws and the data pin 23.

The USB communication interface 25 is connected with the USB communication interface 16 on the panel and is used for connecting the data communication between the main board and the PC.

The time setting key 26 corresponds to the time setting key 10 on the panel, the function selecting knob terminal 27 corresponds to the function selecting knob 2 on the panel, the remote/save local terminal 28 corresponds to the remote key 3 and save local key 4 on the panel, and the start/stop terminal 29 corresponds to the start key 5 and stop key 6 on the panel.

The components on the main board mainly realize the following functions:

1, function selection: the main acquisition and control work of the integrated machine is finished, and firstly, the function selection is carried out, and the main functions of the integrated machine are selected through the buttons and the knobs, so that the setting work is finished.

2, data acquisition: the data are collected through a collection meter pen, and the electricity potential collection, the alternating current and direct current parasitic current collection are conducted. 24-hour data acquisition, 2-hour data acquisition,

3, data storage: after the data are collected, the internal microprocessor processes, distinguishes the interference signals and the normal signals, analyzes according to the selected functions, stores the data into a memory beside the microprocessor when the local storage is needed, and uploads the data to the cloud server through the communication module when the data are needed to be uploaded.

4, data analysis and display: analyzing and processing the acquired data, obtaining the data through an internal algorithm, and displaying the data on a liquid crystal screen.

5 Bluetooth and USB communication: when the data is stored locally, the stored data is transmitted to a computer or a mobile phone through a Bluetooth module or a USB interface.

6, setting a sampling mode: the uploading time, the collecting time and the like are manually set.

The sampling and operating time can be set by the time setting button 10, and the sampling time is generally about 1 minute in the power-on potential sampling mode. In the power-off potential sampling mode, a period is generally 2 minutes, namely 12s for power-on and 3s for power-off, and 8 power-off test operations are performed in one period. In the DC stray current sampling mode, sampling periods are 1H-24H, and sampling intervals are 1-60S. In the alternating current stray current sampling mode, sampling periods 1H-24H and sampling intervals 1-60S.

The communication board of this embodiment can refer to the schematic diagram of fig. 5, and the communication board is fixed on the back of the main board 20 through the data pin 31 and the two lower set screws. After the power is on, a remote transmission switch is selected, the communication board 32 is automatically connected with the cloud end upper computer and/or the server, and data acquired by the local computer are uploaded through a wireless network. Wherein the antenna interface 30 is connected to the NET digital lamp 7 of the control panel.

The communication board is used for uploading the acquired data to the cloud end upper computer and/or the server, and when 24 hours of continuous measurement or power-off test is performed, the data needs to be selected generally and directly uploaded to the server due to huge data volume.

The battery protection board of this embodiment can refer to the schematic diagram of fig. 6, and the battery protection board 34 is used for charging the battery pack, playing a role in protecting the battery pack, and supplying power to the main board and the communication board. The battery protection board is provided with a power output port 35, a battery input port 36, a battery charging port 33 and a power output control port 37, wherein the battery input port 36 is connected with a battery output terminal 39 of the battery compartment, the battery charging port 33 corresponds to the 12V charging hole 11 of the panel, and the power output control port 37 corresponds to the power key 17 of the panel.

The battery protection board realizes the following functions:

1 battery charge control: when the charger is connected to charge the battery, the functions of overcharge, reverse connection prevention, reasonable charging and the like are realized.

2 power supply function: and supplying power to the main board and the communication board through the connecting wires.

The battery compartment of this embodiment may refer to the schematic diagram of fig. 7, and is used for fixing the battery pack, and further includes a battery pack output terminal 39. The battery compartment is fixed at the bottom of the box body of the battery compartment through four set screws. The battery pack 38 as shown provides power to the unit as a whole and is housed in a battery compartment.

Fig. 8 shows a connection manner of collected data according to an embodiment of the present utility model, wherein fig. 8A is a test wiring diagram of the present embodiment, and the connection manner may be used in a power-on potential test mode, a direct current stray current test mode, and an alternating current stray current test mode. When the test of the electrified potential, the direct current stray current and the alternating current stray current is carried out, only a red line is connected with a reference electrode and a black line is connected with a pipeline as shown in fig. 8A.

Fig. 8B and 8C are schematic connection diagrams in the collection mode and the power-off test mode, respectively, in which the red line is connected to the reference electrode, the blue line and the yellow line are connected to the test piece, and the green line is connected to the pipe when the power-off test is performed.

The operational flow of an embodiment of the present utility model is shown in fig. 9:

step 1: connecting the test pile and the equipment in a manner which can be referred to the method shown in fig. 8A-8C;

step 2: turning on the power switch 17;

step 3: the function selection switch 2 is shifted to a position required for the detection so as to select a corresponding sampling mode. The optional modes in this embodiment include power-on potential sampling, power-off potential sampling, direct current stray current sampling, alternating current stray current sampling, but the utility model is not limited thereto;

step 4: the local machine starts a corresponding sampling module according to the acquisition mode selected in the step 3;

step 5: a display screen on the main board displays the sampling data and submits the sampling data to be stored;

step 6: the storage mode of the sampling data is set through the remote transmission key 3 and the local storage key 4. If the local key 4 is selected, the sampled data is stored locally, and if the remote key 3 is selected, the communication board is started and the sampled data is uploaded to the cloud upper computer/server.

In this embodiment, when the local storage mode is adopted, 65536 sets of data can be stored locally, and after detection, the data can be uploaded to the PC end through the bluetooth module or through the data line, and finally uploaded to the cloud end. When the remote transmission mode is adopted, the sampling data is directly uploaded to the cloud for storage, and the detection data can be displayed and read through the mobile phone APP or the PC. But the present utility model is not limited thereto.

The power-on potential sampling module of the present embodiment may refer to the circuit diagram of fig. 10A. In this embodiment, in the electric potential test channel, the signal to be collected is the direct current voltage between the reference electrode and the pipeline, and the signal range is: -0.85V to-1.2V, which is the core signal in the cathodic protection system. The interference signal is: ac stray current, dc stray current. Therefore, when the energizing potential is measured, the ac/dc stray current needs to be filtered out.

When the electrified potential is sampled, the direct current stray current is filtered out firstly, and then the alternating current stray current is filtered out through a high-low frequency alternating current filter circuit. And finally inputting the clean signal into the isolation module. When the electrified potential is sampled, the general sampling period is about 1 minute, and the signal is a constant signal. The sampling time is short, after the signal is filtered and isolated, the sampling AD is input into the MCU, and the MCU further carries out software filtering processing on the signal. And uploading the accurate value to the cloud.

The power-off potential sampling module of the present embodiment may refer to the circuit diagram of fig. 10B. In this embodiment, the power-off potential test channel: the power-off potential is an index for judging the effectiveness of the cathodic protection of the pipeline. The general detection method is not suitable for protecting a pipeline where current cannot be interrupted synchronously (such as a plurality of groups of sacrificial anodes, the sacrificial anodes are directly connected with the pipeline, external forced current equipment which cannot be interrupted exists) or is interfered by direct current stray current.

The outage potential is the pipe protection potential after the IR drop caused by the protection current is eliminated. Before measurement, it should be confirmed that the cathodic protection is operating properly, the tube is sufficiently polarized, and the buried test piece needs to be connected with the tube and jointly protected by the cathode. Reasonable on/off period and power-off time setting principles are: the power-off time should be long enough to collect data after eliminating the impact of the impulse voltage, read gentle power-off potential, and avoid excessive depolarization; when the decoupling device of the capacitive element for interference protection is arranged on the pipeline, a longer power-off time should be considered.

Therefore, the power-off potential needs to be sampled, and the direct current stray current and the alternating current stray current need to be filtered out first. The basic sampling circuit is the same as that in fig. 10A, and fig. 10B is a circuit diagram of the control module driving the relay to be turned on and off and controlling the electrification of the test piece of the polarization probe. The utility model adopts a test piece method to test the power-off potential, realizes the connection of the embedded test piece and the pipeline, is jointly protected by the protection current, and has the same material as the protected body. When the power-off potential needs to be measured, the circuit of fig. 10B is utilized to disconnect the test piece from the pipeline, and the potential of the test piece is continuously measured at this time, namely the power-off potential.

After the power-off potential signal source is obtained, how to obtain the power-off potential value. The power-off potential is the point where the curve changes the most at a moment after the cathodic protection system is powered off. The change in potential decay after power down can be seen graphically in FIG. 11, where Von is the power-on potential, containing IR drop, and Voff is the power-down instantaneous polarization potential, without IR drop. Therefore, it can be determined that the power-off potential is the place where the slope change is the largest after the power-off curve, as shown in fig. 12.

The working process of the equipment is as follows: the device is sampled every 10ms a moment after power down, because the power down depolarization process is done a moment. Thus, 200 sets of data can be obtained by sampling every 10ms for 2 s. Then the front power-on potential front stable data are removed, the rear stable data are removed, and 160 data are reserved for calculation. The average of the 160 sets of data was calculated first, and then the variance of all data from the average was calculated. If the x-m difference exceeds the 2 times standard deviation, the data is discarded, and the data is judged to be burrs.

And after eliminating all interference values, calculating the difference value of the front item and the rear item in all data. The data were taken as a1, a2, a3.. The selected time intervals are the same, an, n+1 with the largest difference. I.e. the point where the slope is greatest. After an, n+1 is obtained, a mean value is obtained by adding the front and rear values. The power-off potential voff= (an-1+an+an+1)/3 is obtained.

The stray current sampling module of this embodiment may refer to the circuit diagram of fig. 10C, including dc stray current and ac stray current sampling. In this embodiment, stray current mainly refers to current that does not move in a prescribed way, and it exists in the soil, and is not associated with the equipment system that needs to be protected. Such stray currents in the soil enter the pipe through a certain part of the pipe and after a certain distance in the pipe leave the pipe and return to the soil, corrosion occurs where these currents leave the pipe, also called stray current corrosion. The output points of the stray current include a plurality of impressed current cathodic protection systems, DC trolley systems, DC mining and welding systems, high voltage DC and AC transmission lines. The stray current is divided into dynamic and static, the magnitude or direction of the stray current which changes with time is dynamic stray current, and the static stray current which does not change. In the part of the pipe where stray currents enter, the pipe is protected for the cathode, but when excessive currents enter, this part of the pipe is over-protected. While the place where the stray current leaves the pipe will corrode due to the loss of electrons. Determining whether the pipe has been disturbed by stray currents can be determined by detecting changes in the pipe potential and comparing it to historical data.

When the direct current stray current is collected, the main interference item is alternating current stray current, and the alternating current stray current is filtered. On the contrary, when the alternating current stray current is collected, the main interference item is direct current stray current, and the direct current stray current is filtered.

When the stray current is collected, the process is mainly slow for a long time, because the generation of the stray current is often related to an electric car system and a subway system. Therefore, the generation of the stray current is a periodic process.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to be included within the scope of the claims of the present application.

Claims

1. A multifunctional inspection device, comprising:

the main board comprises a sampling module group, a display screen, a functional knob, keys and a connecting terminal;

the control panel is used for covering and protecting elements on the main board and fixing and exposing the display screen, the functional knob, the keys and the connecting terminals;

the battery bin is used for fixing the battery pack;

wherein,,

the sampling module group comprises one or more of an electrified potential sampling module, a powered-off potential sampling module, a direct current stray current sampling module and an alternating current stray current sampling module;

the function knob is used for selecting a sampling mode to be used for current detection, and the sampling mode corresponds to a sampling module in the sampling module group;

the battery pack is used for supplying power to the main board;

the connecting terminal is used for receiving the detection equipment through a connecting wire.

2. The multi-function test device of claim 1, further comprising:

the communication board is used for receiving the sampling data obtained by the sampling module group and transmitting the sampling data to the remote upper computer;

wherein,,

the main board also comprises a NET connection indicator lamp which is used for displaying the connection state of the communication board and the remote upper computer;

the battery pack is also used for supplying power to the communication board.

3. The multi-purpose measuring device according to claim 2, wherein,

the keys of the main board comprise a remote control key and a local storage key;

when the remote control key is pressed, the main board controls the communication board to transmit the sampling data to the remote upper computer;

when the local save key is pressed, the main board stores the sampling data in a local memory.

4. A multifunctional testing device according to claim 3, wherein said main board controls said communication board to transmit said sampled data to said remote host computer when continuously testing or de-testing whether a remote control key and/or a local save key is pressed.

5. The device of claim 2, wherein the communication board transmits data to the remote host computer by one or more of 4G, 5G, bluetooth, USB.

6. The multi-function test device of claim 1, further comprising:

the battery protection plate is electrically connected with the main board and used for protecting the battery pack from being charged;

the battery pack is electrically connected with the battery protection plate.

7. The device of claim 1, further comprising

The shell is used for accommodating and fixing the main board, the control panel, the communication board and the battery bin;

the control panel is fixed on the shell through a panel bracket and/or a set screw.

8. The multi-purpose measuring device according to claim 2, wherein,

the control panel is an insulating plate with a preformed hole groove;

the main board is fixed below the control panel, and the display screen, the function knob, the keys and the connecting terminals can be exposed through the reserved empty slots of the control panel;

the communication board is in data connection with the main board, and is connected with the NET through an external communication display line so as to display the connection state of the multifunctional detection device and the remote upper computer.

9. The multifunctional detection device according to claim 1, wherein the power-off potential sampling module is a circuit for controlling the electrification of the test piece of the polarization probe by driving the relay to be switched on and off through the control module.

10. The multi-purpose testing device of claim 1, wherein,

the keys of the main board comprise a time setting key, a starting key and a stopping key;

the time setting key corresponds to a time setting display screen and is used for setting a sampling time period for the sampling modes respectively, and the current sampling mode and/or the sampling time period are displayed through the time setting display screen;

the starting key is used for starting detection;

the stop button is used for stopping detection; and

the display screen of the main board also comprises a data display screen which is used for displaying the data acquired by the sampling module group after the detection is started.

11. The device of claim 1, wherein the connection terminals of the motherboard are quick-connect terminals.

12. The multifunctional detection device according to claim 1, wherein the equipment to be detected is a petroleum pipeline and/or a test pile.

13. The multifunctional testing device of claim 12, wherein the connection terminals are connected to the test posts and/or pipes to be measured by pluggable connection wires, wherein the connection wires are connected to the test posts and/or pipes to be measured with alligator head terminals.

14. The multi-purpose testing device of claim 12, wherein,

the connecting terminal of the main board comprises a power input terminal and a data access terminal;

the power input terminal can be connected with an external power supply to charge the battery;

the data access terminals are four, and are respectively connected with the reference electrode, the pipeline, the test piece I and the test piece II.