Multi-point synchronous monitoring device and method for carbon flux of aeration zone soil

Abstract

The invention discloses an aeration zone soil carbon flux multi-point synchronous monitoring device and method, and the device comprises a base station main body which is in wireless connection with an external monitoring terminal, and a plurality of groups of collection modules which are in wireless connection with the base station main body. The acquisition module comprises a box body with a hollow bottom and an intelligent sensor group which is arranged on the box body and is used for acquiring gas data in the box body; a gas analysis device is arranged in the base station main body, the input end of the gas analysis device is connected with the sampling ports in the outer walls of the plurality of groups of box bodies through a plurality of groups of connecting pipelines, and a sample collection mechanism is arranged in the base station main body. Each box body is connected with the gas analysis equipment through the connecting pipeline, the gas analysis equipment is combined with the intelligent sensor groups on the box bodies, so that the data acquisition range is expanded, and meanwhile, the gas analysis equipment performs regular gas extraction analysis, gas data acquired by the intelligent sensor groups can be calibrated, and the accuracy and the quality of the acquired data are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of soil monitoring, and in particular to a device and method for synchronously monitoring carbon flux of aerated zone soil. Background Art

[0002] The vadose zone is the core area of ​​soil respiration (CO2 emission) and organic carbon decomposition. Its carbon flux directly affects the carbon balance of terrestrial ecosystems. Therefore, it is necessary to monitor the soil carbon flux in the vadose zone.

[0003] Currently, the static chamber method is commonly used to monitor soil carbon flux in the vadose zone of a monitoring area. This involves placing multiple monitoring chambers at different locations in the soil of the monitoring area to simultaneously monitor multiple points in the monitoring area. However, this method has the following drawbacks:

[0004] 1. Most of them only use the intelligent sensor group (gas sensor, etc.) in the monitoring box for real-time monitoring. However, using sensors alone has the disadvantages of single data and inability to calibrate;

[0005] 2. It is impossible to effectively collect gas samples in different monitoring boxes, which limits the quantitative analysis of complex gas components and subsequent laboratory verification, and the traceability of the data is seriously insufficient.

[0006] To this end, we propose a device and method for multi-point synchronous monitoring of soil carbon flux in the vadose zone. Summary of the Invention

[0007] The purpose of the present invention is to provide a device and method for synchronously monitoring carbon flux of soil in the vadose zone at multiple points, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A multi-point synchronous monitoring device for soil carbon flux in the vadose zone includes a base station body wirelessly connected to an external monitoring terminal, and a plurality of collection modules wirelessly connected to the base station body. The collection modules include a box with a hollow bottom and a group of intelligent sensors provided on the box for collecting gas data in the box.

[0010] A gas analysis device is provided in the base station body, and the input end of the gas analysis device is connected to several groups of sampling ports on the outer wall of the box body through several groups of connecting pipes. A sample collection mechanism is provided in the base station body, and the sample collection mechanism includes a rotating seat driven to rotate by a rotating device, several groups of clamping parts for clamping the air bag body arranged in a ring array on the rotating seat, an air bag loading part, an air outlet part and a pushing part arranged in sequence in the base station body above the rotating seat along its rotation direction, the air outlet part is connected to several groups of connecting pipes through several groups of connecting branches, and an electromagnetic valve is provided in the connecting branch.

[0011] A further improvement is that the intelligent sensor group includes a carbon dioxide sensor, a methane sensor, a nitrous oxide sensor and an air temperature sensor.

[0012] A further improvement is that: the clamping portion includes:

[0013] The supporting frame is arranged on the rotating seat, and limit plates are symmetrically slidably provided at both ends of one side thereof. A guide block is movably inserted through the two groups of limit plates, and the long sides of the guide block and the long sides of the limit plates are perpendicular to each other. When the guide block contacts one side of the airbag body, the air inlet end of the airbag body is on the path corresponding to the air outlet part, and the end of the guide block is connected to the supporting frame. The opposite sides of the two groups of limit plates are connected to the supporting frame respectively through an elastic member 1. When the airbag body expands, the limit plate is driven to move and squeeze the elastic member 1.

[0014] A further improvement is that the air outlet portion includes:

[0015] The gas collecting seat is connected to the connecting branch pipe and the inner wall of the base station body. The gas collecting seat is connected to a docking joint for being mounted on the air inlet end of the air bag body through a hose. A one-way valve is provided in the air inlet end of the air bag body. A movable bracket is mounted on the outer wall of the docking joint, and the movable bracket is connected to the gas collecting seat through a second elastic member.

[0016] The electromagnetic ring is provided on the air collecting seat and is used to energize and attract the movable bracket upward, so that the docking joint is separated from the air inlet end of the air bag body;

[0017] A positioning plate is slidably arranged at the bottom of the movable bracket. A detection sensor is provided on the positioning plate for contacting a limit plate in a clamping portion. The detection sensor is electrically connected to a controller. A second solenoid valve is provided in the docking joint. The second solenoid valve and the electromagnetic ring are both electrically connected to the controller. When the detection sensor contacts the limit plate, the controller controls the second solenoid valve and the electromagnetic ring to close, and then the movable bracket drives the positioning plate and the docking joint upward, so that the detection sensor is separated from the limit plate, and the docking joint is separated from the air inlet end of the airbag body;

[0018] The adjusting screw is threadedly inserted into the bottom of the movable bracket, and one end is rotatably connected to the positioning plate, and is used to adjust the position of the detection sensor.

[0019] A further improvement is that the air bag feeding part includes:

[0020] A placement seat, in which several air bag bodies are placed, one end of the placement seat is connected to a guide seat for accommodating an air bag body, the guide seat and the placement seat are perpendicular, one end of the guide seat corresponds to a clamping part, a push plate 1 is movably provided in the placement seat and is driven to move by a second telescopic device, for pushing the air bag body in the placement seat into the guide seat, and a push plate 2 is movably provided in the guide seat and is driven to move by a third telescopic device, for pushing an air bag body in the guide seat into between the two limit plates in the clamping part.

[0021] A further improvement is that a through opening is provided on the outer wall of the guide seat away from the placement seat, and a micro-injection coding device is provided on the outer wall of the guide seat away from the placement seat, and the printing end of the micro-injection coding device corresponds to the through opening.

[0022] A further improvement is that a hollow seat is inserted into the center of the rotating seat, which is connected to the inner cavity of the limit plate through a pipeline, and is also connected to the input end of the micro negative pressure device through a pipeline. Adsorption holes connected to the inner cavity of the two sets of limit plates are opened on the opposite side.

[0023] A further improvement is that the pushing portion includes:

[0024] A telescopic device 1 is connected to the inner wall of the base station body via a connecting frame, and a push block is provided at the output end of the telescopic device 1, and the telescopic device 1 is used to drive the push block into between the two limit plates in the clamping part to push the airbag body out of the rotating seat;

[0025] The collecting box is arranged in the base station body and below the rotating seat, and is used for collecting the air bag body pushed out by the pushing block.

[0026] A further improvement is that a micro-air induction device is provided on the connecting pipeline, an electric three-way valve is provided between the connecting pipeline and the sampling port of the box, one input end of the electric three-way valve is also connected to the filter element, the electric three-way valve, micro-air induction device, gas analysis equipment, intelligent sensor group, rotating equipment and sample collection mechanism are all electrically connected to electrical components, and the electrical components are provided in the base station body. The electrical components include: a controller, a wireless communication device, an electromagnetic valve and a power supply device.

[0027] A method for synchronously monitoring carbon flux at multiple points in the vadose zone soil, using the above-mentioned monitoring device, comprises the following steps:

[0028] S1: several groups of acquisition modules are deployed in the monitoring area and covered on the soil at different locations, and the base station body is deployed in the area near the several groups of acquisition modules;

[0029] S2: The intelligent sensor group in the acquisition module monitors the gas data in the box in real time and sends the gas data to the external monitoring terminal for processing and analysis to obtain the soil carbon flux in the vadose zone of the monitoring area;

[0030] S3: The gas analysis equipment regularly detects and analyzes the gas entering from the connecting pipeline to obtain gas verification data, and sends the gas verification data to the external monitoring terminal. The external monitoring terminal regularly calibrates the gas data or processes and analyzes the gas verification data to obtain the soil carbon flux in the vadose zone of the monitoring area;

[0031] Among them, when in use, by opening the corresponding solenoid valve 1, the corresponding connecting branch pipe will guide the gas entering from the connecting pipeline into the air outlet part, and then inject it into the air bag main body clamped by the corresponding clamping part through the air outlet part to obtain a gas sample. Subsequently, the rotating device drives the rotating seat to rotate so that the air bag main body clamped by the other clamping part corresponds to the air outlet part. At the same time, the air bag loading part loads the new air bag main body into the corresponding clamping part, and the pushing part pushes the air bag main body that has been injected with gas away from the rotating seat.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] Each box of the present invention is connected to the gas analysis equipment through a connecting pipeline. The gas analysis equipment is combined with the intelligent sensor group on the box, which not only improves the data acquisition range, but also the gas analysis equipment regularly extracts gas for analysis, and can calibrate the gas data collected by the intelligent sensor group to ensure the accuracy and quality of the collected data; at the same time, the present invention is also provided with a sample collection mechanism, which can collect gas samples in the corresponding box through connecting pipelines and connecting branches, and inject the collected gas samples into the air bag main body clamped by the clamping part through the air outlet part, which is convenient for quantitative analysis of complex gas components and subsequent laboratory verification, and helps to trace the data; and an air bag loading part is also provided. When the gas sample is injected into the air bag main body, the air bag main body can be loaded and unloaded through the air bag loading part and the pushing part, thereby improving the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the synchronous monitoring device of the present invention;

[0035] Figure 2 For the present invention Figure 1 Partial structural cross-sectional view;

[0036] Figure 3 Schematic diagram of the sample collection mechanism structure of the present invention;

[0037] Figure 4 For the present invention Figure 3 Bottom view of local structure;

[0038] Figure 5 For the present invention Figure 4 A magnified view of structure A in .

[0039] In the figure: 1. Base station body; 2. Gas analysis equipment; 3. Box body; 4. Intelligent sensor group; 5. Connecting pipeline; 6. Micro air bleed equipment; 7. Rotating seat; 8. Rotating equipment; 9. Carrying frame; 10. Limiting plate; 11. Hollow seat; 12. Micro negative pressure equipment; 13. Guide block; 14. Elastic part 1; 15. Connecting branch pipe; 16. Gas collecting seat; 17. Air bag body; 18. Telescopic equipment 1; 19. Push block; 20. Placement seat; 21. Guide seat; 22. Telescopic equipment 2; 23. Push plate 1; 24. Telescopic equipment 3; 25. Micro inkjet printer equipment; 26. Elastic part 2; 27. Positioning plate; 28. Adjusting screw; 29. ​​Detection sensor; 30. Electromagnetic ring; 31. Connector; 32. Electric three-way valve; 33. Filter element; 34. Electrical component; 35. Collection box. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] Example 1

[0042] Please see the attached Figure 1 -Attached Figure 2 A multi-point synchronous monitoring device for carbon flux in the vadose zone soil includes a base station body 1 wirelessly connected to an external monitoring terminal, and a plurality of acquisition modules wirelessly connected to the base station body 1. The acquisition modules include a box body 3 with a hollow bottom and an intelligent sensor group 4 provided on the box body 3 for collecting gas data in the box body 3. The box body 3 is usually made of stainless steel. The bottom of the box body 3 is hollow and embedded with a sealing ring. The sealing ring ensures that the box body 3 is in close contact with the soil to prevent external gas exchange from interfering with the measurement.

[0043] It should be noted that one side of the base station body 1 has a door.

[0044] Preferably, the smart sensor group 4 of this embodiment includes a carbon dioxide sensor, a methane sensor, a nitrous oxide sensor, and an air temperature sensor. The above sensors are conventional devices in the art and will not be described in detail here.

[0045] The intelligent sensor group 4 is used to monitor the soil area in the box 3 in real time and obtain gas data, including CO2 data, air temperature data, etc., so that the external monitoring terminal can process and analyze the gas data to obtain the carbon flux data of the vadose zone soil.

[0046] The base station body 1 is provided with a gas analysis device 2, which is a conventional device in the field and will not be described in detail here. The input end of the gas analysis device 2 is connected to a plurality of sampling ports on the outer wall of the box 3 through a plurality of connecting pipes 5. Figure 1 and attached Figure 2 As shown, if there are three groups of boxes 3, the three groups of boxes 3 are connected respectively through three groups of connecting pipes 5;

[0047] A sample collection mechanism is provided within the base station body 1. The sample collection mechanism includes a rotating base 7 driven to rotate by a rotating device 8, a plurality of clamping portions arranged in a circular array on the rotating base 7 for clamping the air bag body 17, an air bag loading portion, an air outlet portion, and a pushing portion arranged in sequence within the base station body 1 above the rotating base 7 and along its rotation direction (specifically, in a clockwise direction). The air outlet portion is connected to a plurality of connecting pipes 5 through a plurality of connecting branch pipes 15. A solenoid valve 1 is provided within the connecting branch pipe 15.

[0048] The rotating seat 7 can be connected to the inner wall of the base station body 1 through a rotating bracket, and the rotating device 8 is a motor, a reducer, and a gear structure (including a gear and a gear ring) that transmits the output end of the reducer to the rotating seat 7;

[0049] Users can collect gas samples from the corresponding box 3 as needed so that the gas samples can be brought back to the laboratory for processing (for example, using high-precision equipment such as gas chromatography-mass spectrometry (GC-MS) or infrared spectrometer to ensure data accuracy) or stored for subsequent review or in-depth research.

[0050] A method for synchronously monitoring carbon flux at multiple points in the vadose zone soil, using the above-mentioned monitoring device, comprises the following steps:

[0051] S1: several groups of acquisition modules are deployed in the monitoring area, covering different soil types, and the base station body 1 is deployed in the area near the several groups of acquisition modules;

[0052] S2: The intelligent sensor group 4 in the acquisition module monitors the gas data in the box 3 in real time and sends the gas data to the external monitoring terminal for processing to obtain the soil carbon flux in the vadose zone of the monitoring area;

[0053] S3: The gas entering from the connecting pipeline 5 can be regularly detected and analyzed by the gas analysis equipment 2 to obtain gas verification data, and the verification data can be sent to the external monitoring terminal. The external monitoring terminal regularly calibrates the gas data by using the verification data. When in use, by opening the corresponding solenoid valve 1, the corresponding connecting branch pipe 15 can guide the gas entering from the connecting pipeline 5 into the gas outlet, and then inject it into the air bag main body 17 clamped by the corresponding clamping part through the gas outlet to obtain a gas sample. Subsequently, the rotating device 8 drives the rotating seat 7 to rotate so that the air bag main body 17 clamped by the other clamping part corresponds to the gas outlet. At the same time, the air bag loading part loads the new air bag main body 17 into the corresponding clamping part, and the pushing part pushes the air bag main body 17 that has been injected with gas away from the rotating seat 7.

[0054] Example 2

[0055] Please see the attached Figure 3 -Attached Figure 5 , the clamping portion of this embodiment includes:

[0056] When the air bag body 17 is separated from the two sets of limit plates 10, the limit plate 10 is reset under the action of the elastic member 14.

[0057] It should be noted that, initially, the distance between the two sets of limiting plates 10 is adapted to the thickness of the airbag body 17 that is not inflated.

[0058] Preferably, the air outlet portion of this embodiment includes:

[0059] The gas collecting seat 16 is communicated with the connecting branch pipe 15 and is connected to the inner wall of the base station body 1 through a bracket. The gas collecting seat 16 is connected to a docking joint 31 for being sleeved on the air inlet end of the air bag body 17 through a hose. A one-way valve is provided in the air inlet end of the air bag body 17. The air inlet end is in the shape of a cylindrical tube, and the lower vertical cross-section is rectangular and has a certain thickness. For example, an inflatable air storage bag in the prior art can be used (it is flat when not inflated and expands into a cube after inflation), or a self-standing air bag bag (the bottom is made of hard plastic (such as PP) or folded cardboard to make the support ring / base so that the bag body stands upright, and the bag body is made of highly elastic material (such as TPU, PVC coated cloth), which expands outward after inflation). It can also be an air bag made of rubber material, and the air bag has a bracket (rectangular bracket) inside. Of course, the air bag body 17 is not limited to the above-mentioned types;

[0060] The one-way valve at the air inlet end of the air bag body 17 is set so that when the joint 31 is separated from the air inlet end of the air bag body 17, the gas in the air bag body 17 will not be discharged from the air bag body 17. Of course, the outer wall of the air inlet end of the air bag body 17 can be provided with a thread, and the user can also screw on the sealing cover to seal it again later. The inner diameter of the joint 31 is adapted to the outer diameter of the air inlet end of the air bag body 17, and a sealing ring is also embedded in the inner wall of the joint 31 to ensure the sealing of the connection between it and the air inlet end of the air bag body 17.

[0061] The outer wall of the butt joint 31 is provided with a movable bracket, and the movable bracket is connected to the gas collecting seat 16 through the elastic member 26 (such as a spring);

[0062] The electromagnetic ring 30 is provided on the gas collecting seat 16 and is used to electrically attract the movable bracket upward, so that the docking joint 31 is separated from the air inlet end of the air bag body 17. Similarly, when injecting gas, by de-energizing the electromagnetic ring 30, the movable bracket is driven downward by the elastic member 26, so that the docking joint 31 is docked with the air inlet end of the air bag body 17.

[0063] The positioning plate 27 is slidably arranged at the bottom of the movable bracket. The positioning plate 27 is provided with a detection sensor 29 for contacting a limit plate 10 in a clamping portion. The detection sensor 29 is electrically connected to the controller. The detection sensor 29 is, for example, a pressure sensor. A second solenoid valve is provided in the docking joint 31. The second solenoid valve and the electromagnetic ring 30 are both electrically connected to the controller. When the detection sensor 29 contacts the limit plate 10, the controller controls the second solenoid valve and the electromagnetic ring 30 to close, and then the movable bracket drives the positioning plate 27 and the docking joint 31 upward, so that the detection sensor 29 is separated from the limit plate 10, and the docking joint 31 is separated from the air inlet end of the airbag main body 17. As the gas enters the airbag main body 17, the airbag main body 17 begins to expand, and then the two corresponding groups of limit plates 10 move away from each other. When one of the limit plates 10 moves and contacts the detection sensor 29, the controller controls the solenoid valve 2 and the electromagnetic ring 30, and then the docking joint 31 no longer releases gas, and the docking joint 31 is separated from the air inlet end of the airbag main body 17. This not only effectively controls the amount of gas injected into the airbag main body 17, but also prevents the airbag main body 17 from being damaged and ruptured due to excessive expansion, but also facilitates the subsequent air injection of other airbag main bodies 17.

[0064] The adjusting screw 28 is threadedly inserted into the bottom of the movable bracket, and one end is rotatably connected to the positioning plate 27 for adjusting the position of the detection sensor 29. The other end of the adjusting screw 28 is provided with a hand wheel, and the position of the detection sensor 29 is adjustable to control the amount of gas injected into the airbag body 17.

[0065] Preferably, the air bag feeding part of this embodiment includes:

[0066] The placement seat 20 has several air bag bodies 17 placed inside it. The top of the placement seat 20 has a cover so that the air bag bodies 17 can be added to the inside. Several air bag bodies 17 are stacked in the placement seat 20 in sequence along the long side direction of the placement seat 20. One end of the placement seat 20 is connected to a guide seat 21 for accommodating one air bag body 17. The guide seat 21 and the placement seat 20 are perpendicular to each other. One end of the guide seat 21 corresponds to a clamping portion. A push plate 23 is movable in the placement seat 20 and is driven by a telescopic device 22 (such as an electric telescopic rod) to push the air bag body 17 in the placement seat 20 into the guide seat 21. When the telescopic device 22 is working, it will push several air bag bodies in the placement seat 20. The airbag body 17 moves synchronously toward the guide seat 21 until the airbag body 17 closest to the guide seat 21 enters the guide seat 21. At this time, the telescopic device 22 is closed. In order to facilitate the control of the telescopic device 22, in actual conditions, a pressure sensor in contact with the airbag body 17 can be set on the inner wall of the guide seat 21. It is not described in detail here. A push plate 2 is movably provided in the guide seat 21, which is driven by the telescopic device 3 24 (such as an electric telescopic rod) to push an airbag body 17 in the guide seat 21 into between the two limit plates 10 in the clamping part. Then the telescopic device 3 24 drives the push plate 2 to push the airbag body 17 in the guide seat 21 to between the corresponding two limit plates 10.

[0067] Preferably, a through opening is provided on the outer wall of the guide seat 21 of this embodiment away from the placement seat 20, and a micro-injection coding device 25 is provided on the outer wall of the guide seat 21 away from the placement seat 20. The printing end of the micro-injection coding device 25 corresponds to the through opening. The micro-injection coding device 25 is a device for printing characters, numbers or graphics on the surface of a product, usually used to identify product information, and is a conventional device in this field. It will not be described in detail here. The external monitoring terminal can send a coding instruction that requires coding to the micro-injection coding device 25, and the micro-injection coding device 25 prints information on the corresponding air bag body 17. The printed information may be, for example, the name of the box 3, the sampling time, etc., for subsequent use.

[0068] Preferably, a hollow seat 11 is inserted into the center of the rotating seat 7 of this embodiment. The hollow seat 11 is connected to the inner cavity of the limit plate 10 through a pipeline, and is also connected to the input end of the micro-negative pressure device 12 through a pipeline (the pipeline is rotatably connected to the hollow seat 11). The two sets of limit plates 10 are provided with adsorption holes connected to their inner cavities on opposite sides. The micro-negative pressure device 12 is such as a micro-induced draft fan. After the air bag main body 17 passes through the telescopic device three 24 and the push plate two and moves into the two sets of limit plates 10, negative pressure can be generated at the adsorption hole under the action of the micro-negative pressure device 12, and the air bag main body 17 can be adsorbed to prevent the air bag main body 17 from moving when the rotating seat 7 rotates.

[0069] Preferably, the pusher portion of this embodiment includes:

[0070] A telescopic device 18 (e.g., an electric telescopic rod) is connected to the inner wall of the base station body 1 via a connecting frame. A push block 19 is provided at the output end of the telescopic device 18. The telescopic device 18 is used to drive the push block 19 into between the two limit plates 10 in the clamping portion to push the airbag body 17 out of the rotating seat 7.

[0071] The collection box 35 has a hollow top and is arranged inside the base station body 1 and below the rotating seat 7. It is used to collect the air bag body 17 pushed out by the push block 19. The push block 19 is driven to move by the telescopic device 18, and the air bag body 17 can be pushed away from the rotating seat 7, so that the air bag body 17 falls downward into the collection box 35.

[0072] Example 3

[0073] Please refer to the accompanying drawings. Based on Example 2, a micro air induction device 6, such as a micro fan, is provided on the connecting pipeline 5 of this embodiment. An electric three-way valve 32 is provided between the connecting pipeline 5 and the sampling port of the box 3. One input end of the electric three-way valve 32 is also connected to a filter 33. The filter 33 is, for example, a pipe and a filter mesh provided in the pipe. The electric three-way valve 32, the micro air induction device 6, the gas analysis device 2, the intelligent sensor group 4, the rotating device 8 and the sample collection mechanism are all electrically connected to an electrical device 34. The electrical device 34 is provided in the base station body 1. The electrical device 34 includes: a controller, a wireless communication device and a power supply device.

[0074] When the gas is detected by the gas analysis device 2, the sampling port and the connecting pipe 5 can be connected by controlling the electric three-way valve 32, and the micro air inlet device 6 is opened, so that the gas in the box 3 is detected by the gas analysis device 2 or gas sample sampling is performed through the sampling port, the electric three-way valve 32 and the connecting pipe 5;

[0075] After collecting the gas sample, the filter element 33 is connected to the connecting pipe 5 by controlling the electric three-way valve 32, the micro-air inlet device 6, the solenoid valve 1 in the corresponding connecting branch 15, the solenoid valve 2 in the docking joint 31, and the gas analysis equipment 2 are closed. Then, the external gas is filtered through the filter element 33, and then enters the corresponding connecting branch 15, the gas collecting seat 16, the hose and the docking joint 31 through the electric three-way valve 32 and the connecting pipe 5, and is discharged from the docking joint 31 to remove the residual gas samples remaining in each pipeline, so as to improve the quality of the subsequent collection of gas samples.

[0076] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multi-point synchronous monitoring device for soil carbon flux in the vadose zone, characterized in that: The invention comprises a base station body (1) wirelessly connected to an external monitoring terminal, and a plurality of collection modules wirelessly connected to the base station body (1), wherein the collection modules comprise a box body (3) with a hollow bottom and an intelligent sensor group (4) provided on the box body (3) for collecting gas data in the box body (3); The base station body (1) is provided with a gas analysis device (2), and the input end of the gas analysis device (2) is connected to a plurality of sampling ports on the outer wall of the box (3) through a plurality of connecting pipes (5). The base station body (1) is provided with a sample collection mechanism, which includes a rotating seat (7) driven to rotate by a rotating device (8), a plurality of clamping parts for clamping the air bag body (17) arranged in a circular array on the rotating seat (7), an air bag feeding part, an air outlet part and a pushing part arranged in sequence in the base station body (1) above the rotating seat (7) along its rotation direction, the air outlet part is connected to the plurality of connecting pipes (5) through a plurality of connecting branch pipes (15), and a solenoid valve is provided in the connecting branch pipe (15).

2. The monitoring device according to claim 1, characterized in that: The intelligent sensor group (4) comprises a carbon dioxide sensor, a methane sensor, a nitrous oxide sensor and an air temperature sensor.

3. The monitoring device according to claim 1, wherein: The clamping portion comprises: The carrier (9) is arranged on the rotating seat (7), and a limit plate (10) is symmetrically slidably provided at both ends of one side of the carrier (9). A guide block (13) is movably inserted through the two groups of limit plates (10). The long side of the guide block (13) is perpendicular to the long side of the limit plate (10). When the guide block (13) contacts one side of the air bag body (17), the air inlet end of the air bag body (17) is on a path corresponding to the air outlet. The end of the guide block (13) is connected to the carrier (9). The two groups of limit plates (10) are connected to the carrier (9) on opposite sides respectively through an elastic member (14). When the air bag body (17) expands, the limit plate (10) is driven to move and squeeze the elastic member (14).

4. The monitoring device according to claim 3, characterized in that: The gas outlet portion comprises: The gas collecting seat (16) is connected to the connecting branch pipe (15) and the inner wall of the base station body (1). The gas collecting seat (16) is connected to a docking joint (31) for being sleeved on the air inlet end of the air bag body (17) through a hose. A one-way valve is provided in the air inlet end of the air bag body (17). A movable bracket is sleeved on the outer wall of the docking joint (31), and the movable bracket is connected to the gas collecting seat (16) through a second elastic member (26). An electromagnetic ring (30) is provided on the air collecting seat (16) and is used to electrically attract the movable bracket upward, so that the docking joint (31) is separated from the air inlet end of the air bag body (17); A positioning plate (27) is slidably arranged at the bottom of the movable bracket. A detection sensor (29) is provided on the positioning plate (27) for contacting a limit plate (10) in a clamping portion. The detection sensor (29) is electrically connected to a controller. A second solenoid valve is provided in the docking joint (31). The second solenoid valve and the electromagnetic ring (30) are both electrically connected to the controller. When the detection sensor (29) contacts the limit plate (10), the controller controls the second solenoid valve and the electromagnetic ring (30) to close, and then the movable bracket drives the positioning plate (27) and the docking joint (31) upward, so that the detection sensor (29) is separated from the limit plate (10), and the docking joint (31) is separated from the air inlet end of the air bag body (17); The adjusting screw (28) is threadedly inserted into the bottom of the movable bracket, and one end of the adjusting screw is rotatably connected to the positioning plate (27) for adjusting the position of the detection sensor (29).

5. The monitoring device according to claim 4, characterized in that: The air bag feeding part includes: A placement seat (20) is provided with a plurality of air bag bodies (17) therein. One end of the placement seat (20) is connected to a guide seat (21) for accommodating an air bag body (17). The guide seat (21) and the placement seat (20) are perpendicular to each other. One end of the guide seat (21) corresponds to a clamping portion. A push plate (23) is movably provided in the placement seat (20) and is driven to move by a telescopic device (22) to push the air bag body (17) in the placement seat (20) into the guide seat (21). A push plate (2) is movably provided in the guide seat (21) and is driven to move by a telescopic device (24) to push the air bag body (17) in the guide seat (21) into between the two limit plates (10) in the clamping portion.

6. The monitoring device according to claim 5, characterized in that: A through opening is provided on the outer wall of the guide seat (21) away from the placement seat (20), and a micro-inkjet coding device (25) is provided on the outer wall of the guide seat (21) away from the placement seat (20), wherein the printing end of the micro-inkjet coding device (25) corresponds to the through opening.

7. The monitoring device according to claim 3, characterized in that: A hollow seat (11) is inserted into the center of the rotating seat (7), and the hollow seat (11) is connected to the inner cavity of the limit plate (10) through a pipeline, and is also connected to the input end of the micro negative pressure device (12) through a pipeline. Adsorption holes are opened on the opposite sides of the two groups of limit plates (10) to communicate with their inner cavities.

8. The monitoring device according to claim 1, characterized in that: The pushing portion includes: A telescopic device (18) is connected to the inner wall of the base station body (1) through a connecting frame. A push block (19) is provided at the output end of the telescopic device (18). The telescopic device (18) is used to drive the push block (19) into between the two limit plates (10) in the clamping portion to push the airbag body (17) out of the rotating seat (7). The collecting box (35) is arranged in the base station body (1) and located below the rotating seat (7), and is used for collecting the air bag body (17) pushed out by the pushing block (19).

9. The monitoring device according to claim 1, characterized in that: The connecting pipeline (5) is provided with a micro air inlet device (6), an electric three-way valve (32) is provided between the connecting pipeline (5) and the sampling port of the box (3), an input end of the electric three-way valve (32) is also connected to the filter element (33), the electric three-way valve (32), the micro air inlet device (6), the gas analysis device (2), the intelligent sensor group (4), the rotating device (8) and the sample collection mechanism are all electrically connected to an electrical device (34), the electrical device (34) is provided in the base station body (1), and the electrical device (34) includes: a controller, a wireless communication device, an electromagnetic valve and a power supply device.

10. A method for synchronously monitoring carbon flux in aeration zone soil at multiple locations, using the monitoring device according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: several groups of acquisition modules are arranged in the monitoring area and covered on the soil at different positions, and the base station body (1) is arranged in the area near the several groups of acquisition modules; S2: The intelligent sensor group (4) in the acquisition module monitors the gas data in the box (3) in real time, and sends the gas data to the external monitoring terminal for processing and analysis to obtain the soil carbon flux in the vadose zone of the monitoring area; S3: The gas analysis device (2) regularly detects and analyzes the gas entering from the connecting pipeline (5) to obtain gas verification data, and sends the gas verification data to an external monitoring terminal. The external monitoring terminal regularly calibrates the gas data or processes and analyzes the gas verification data to obtain the carbon flux of the vadose zone soil in the monitoring area; Among them, when in use, by opening the corresponding solenoid valve 1, the corresponding connecting branch pipe (15) guides the gas entering from the connecting pipeline (5) into the gas outlet, and then injects it into the air bag body (17) clamped by the corresponding clamping part through the gas outlet to obtain a gas sample. Subsequently, the rotating device (8) drives the rotating seat (7) to rotate, so that the air bag body (17) clamped by the other clamping part corresponds to the gas outlet. At the same time, the air bag loading part loads the new air bag body (17) into the corresponding clamping part, and the pushing part pushes the air bag body (17) that has been injected with gas away from the rotating seat (7).

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