Soil carbon dioxide gas collecting device
By designing the drilling mechanism and filter screen, the problems of carbon dioxide escape and impurity contamination in soil carbon dioxide gas collection devices have been solved, achieving high-precision and clean carbon dioxide collection.
Patent Information
- Application Number
- CN202511317283.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-16
- Publication Date
- 2025-11-21
AI Technical Summary
Existing soil carbon dioxide gas sampling devices cause carbon dioxide to escape when the soil is turned over before the suction hood contacts the soil during the sampling process. In addition, outside air enters during the suction process, which reduces the accuracy of the measurement.
The drilling mechanism, including a drill rod and a drill bit, is used to drill into the soil. Combined with a piston rod and a filter screen, the drill rod is sealed to the soil to prevent gas escape, and the filter screen filters out solid impurities, improving the accuracy and cleanliness of the sampling.
It effectively reduces the escape of carbon dioxide gas from the soil, improves measurement accuracy, ensures the cleanliness of the collected carbon dioxide gas, and extends the service life of the filter.
Smart Images
Figure CN120992271A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of soil carbon dioxide gas collection, in particular to a soil carbon dioxide gas collection device. BACKGROUND
[0002] Soil is one of the largest carbon pools on earth, capable of absorbing and storing a large amount of carbon dioxide, measuring soil carbon dioxide flux helps to evaluate the carbon storage capacity of soil and its role in global carbon cycle, in the process of measuring carbon dioxide in soil, first of all, the quantitative collection of carbon dioxide in different depths of soil layer is needed through the carbon dioxide gas collector, and then the collected carbon dioxide samples are detected and analyzed by the measuring instrument.
[0003] The patent with publication number CN218916964U discloses a soil carbon dioxide gas collection device, which comprises an air suction cover, a fixed rod connected to the upper end of the air suction cover, a rotating rod rotatably installed in the fixed rod, rotating blades provided at the lower end of the rotating rod, a gas guide pipe screwed to the air suction cover, a gas separation device and a vacuum pump in communication, and a collection bag connected to the gas outlet end of the vacuum pump. The rotating rod is driven to rotate, the rotating blades of the rotating rod are used to turn the soil, the lower end of the air suction cover can be immersed in the soil, the vacuum pump is started, the carbon dioxide in the soil is sucked into the collection bag, the collection of carbon dioxide in the soil is realized, manual soil digging is not needed, the collection of carbon dioxide in the soil by the staff is more convenient, and the collection efficiency of carbon dioxide is improved.
[0004] In the above-mentioned scheme, before the air suction cover contacts the soil, the rotating blades are always turning the soil downward. During this process, the surrounding soil is turned by the rotating blades, and part of the carbon dioxide contained in the soil will be released to the outside, resulting in a decrease in the amount of carbon dioxide that can be collected, thereby reducing the accuracy of the measurement of the amount of carbon dioxide in the soil. In addition, since the lower end of the air suction cover is immersed in the loosened soil, when the air suction cover inhales the soil, air from the outside can easily enter the air suction cover through the loosened soil, thereby further reducing the accuracy of the measurement of the amount of carbon dioxide in the soil. Therefore, the present application provides a soil carbon dioxide gas collection device. SUMMARY
[0005] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.
[0006] The technical scheme adopted by the present application to solve its technical problems is: the soil carbon dioxide gas collecting device comprises a handle frame and a collecting tank, a drilling mechanism is arranged below the handle frame, valves are arranged at the gas inlet end and the gas outlet end of the collecting tank, the valve at the gas inlet end of the collecting tank is connected with a gas pipe, a piston rod is inserted into the collecting tank, the tail end of the piston rod is connected with a connecting piece, the upper end of the connecting piece is connected with an electric push rod, the electric push rod is fixedly installed on the collecting tank, the drilling mechanism comprises a drill rod, the upper end of the drill rod is rotatably connected with the handle frame, a driven gear is fixedly sleeved on the drill rod, the driven gear is engaged with a main gear, the main gear is rotatably installed on the handle frame, a support frame is arranged in the fixed sleeve, the upper end of the support frame is fixedly connected with the inner wall of the handle frame, a threaded pipe is rotatably installed in the support frame, the upper end of the threaded pipe is rotatably connected with the end of the gas pipe through the top of the handle frame, a rectangular column is screwed at the lower end of the threaded pipe, a drill bit is rotatably connected with the lower end of the rectangular column, the upper end of the rectangular column is movably inserted into the lower end of the support frame, and three air vents are formed in the threaded pipe. During the rotation of the drill rod and the drill bit, the soil around the drill rod and the drill bit is less disturbed, thereby avoiding the escape of a large amount of carbon dioxide gas in the soil, and secondly, during the extraction of carbon dioxide gas in the soil, the drill rod and the soil are in airtight connection, thereby avoiding the mixing of external gas into the collecting tank, and improving the accuracy of the measurement of the amount of carbon dioxide in the soil.
[0007] Preferably, three groups of filter screens are equiangularly arranged on the outer ring of the support frame. The solid impurities in the carbon dioxide gas are filtered out through the filter screens, so that the cleanliness of the collected carbon dioxide gas is ensured.
[0008] Preferably, the drilling mechanism further comprises a cleaning mechanism, the cleaning mechanism comprises a fixed plate, the fixed plate is fixedly installed in the drill rod, an active plate is arranged below the fixed plate, two groups of springs are arranged between the fixed plate and the active plate, two groups of brushes are symmetrically arranged on both sides of the support frame, an active strip is movably installed in the brush, the lower end of the active strip is fixedly connected with the fixed plate and the active plate through the fixed plate and the active plate, two groups of accommodation grooves are symmetrically formed in the inner ring of the drill rod, the two groups of brushes are respectively inserted into the two groups of accommodation grooves, an active groove is formed in the back side of the brush, the active strip is slidably connected with the active groove, two groups of inclined grooves are formed in the active strip, a pin shaft is arranged in the inclined groove, the pin shaft is fixedly installed in the active groove, a guide hole is formed in the fixed plate and the active plate, and the rectangular column penetrates through the two groups of guide holes. The drill rod is driven to rotate, the drill rod drives the brushes to rotate around the filter screens, so that the solid impurities of the filter screens are cleaned, thereby not only ensuring the smooth passage of the carbon dioxide gas through the filter screens, but also improving the service life of the filter screens.
[0009] Preferably, the piston rod comprises a rod body, a rod body head portion is slidingly connected to the inner wall of the collecting tank, a rod body tail portion is fixedly connected to the connecting piece, a screw rod is screwed in the interior of the rod body, a first plug is fixedly installed at one end of the screw rod, a guide column is arranged in front of the first plug, a second plug is fixedly installed at one end of the guide column, a support plate is arranged in the rod body head portion, the guide column is movably inserted into the support plate, a flow channel is arranged in the interior of the rod body, and the screw rod is screwed into the flow channel; The air in the collecting tank will be compressed into the air pipe and sprayed onto the filter screen through the air vent, and the cycle is repeated for multiple times, so that the solid impurities on the filter screen are cleaned more thoroughly, and the air entering the drill rod forms an air flow, and the solid impurities cleaned away are discharged from the lower end of the drill rod, thereby avoiding the accumulation of the solid impurities cleaned away in the drill rod.
[0010] The beneficial effects of the present application are as follows: 1. The drill rod and the drill bit cause less disturbance to the surrounding soil during rotation, thereby avoiding the escape of a large amount of carbon dioxide gas in the soil, and the drill rod and the soil are in airtight state during the extraction of carbon dioxide gas in the soil, thereby avoiding the mixing of external gas into the collecting tank and improving the accuracy of the measurement of the amount of carbon dioxide in the soil.
[0011] 2. The carbon dioxide gas in the soil sequentially passes through the inner cavity of the drill rod, the air vent, the inner cavity of the threaded pipe, the air pipe and the valve, and the carbon dioxide gas passes through the filter screen to filter out the solid impurities in the carbon dioxide gas, thereby ensuring the cleanliness of the collected carbon dioxide gas.
[0012] 3. The drill rod is separated from the soil, and then the threaded pipe is continuously rotated, the rectangular column and the drill bit continue to move upward, the upper end of the drill bit is pressed against the movable plate, the movable plate moves upward, the movable plate compresses the two groups of springs, the movable plate pushes the two groups of movable strips upward, under the guidance of the inclined grooves, the pin shaft drives the brush to move toward the filter screen, until the fiber wire on the brush is pressed against the filter screen, then the drill rod is driven to rotate, the drill rod drives the brush to rotate around the filter screen, so that the solid impurities on the filter screen are cleaned away, thereby ensuring the smooth passage of the carbon dioxide gas through the filter screen and improving the service life of the filter screen. BRIEF DESCRIPTION OF DRAWINGS
[0013] The present application will be further described below in conjunction with the drawings.
[0014] Figure 1 It is a schematic diagram of the overall structure of the present application.
[0015] Figure 2 It is a schematic diagram of the combination of the collecting tank, the piston rod and the connecting piece in cross section.
[0016] Figure 3 It is a schematic diagram of the combination of the handle frame, the drilling mechanism and the air pipe in cross section.
[0017] Figure 4 It is the combined schematic view of the main gear, threaded pipe, rectangular column and drill bit of the present application.
[0018] Figure 5 It is the combined schematic view of the main gear and threaded pipe of the present application.
[0019] Figure 6 It is the combined schematic view of the sectional view of the drill pipe, rectangular column, drill bit, cleaning mechanism and support frame of the present application.
[0020] Figure 7 It is the schematic view of the cleaning mechanism of the present application.
[0021] Figure 8 It is the sectional view of the drill pipe and brush of the present application. Figure 7 It is the enlarged view of A in the middle.
[0022] Figure 9 It is the combined schematic view of the sectional view of the collecting tank and piston rod of the present application.
[0023] Figure 10 It is the combined schematic view of the sectional view of the collecting tank and piston rod of the present application.
[0024] In the figure: 1, handle frame; 2, drilling mechanism; 3, collecting tank; 4, valve; 5, air pipe; 6, piston rod; 7, connecting piece; 8, electric push rod; 201, drill pipe; 2011, storage groove; 202, driven gear; 203, main gear; 2031, filter screen; 204, threaded pipe; 2041, air vent; 205, rectangular column; 206, drill bit; 207, cleaning mechanism; 208, support frame; 2071, fixed plate; 2072, movable plate; 12, guide hole; 2073, spring; 2074, brush; 741, movable groove; 2075, movable strip; 751, inclined groove; 752, pin shaft; 601, rod body; 6011, flow channel; 602, screw rod; 603, first plug; 604, second plug; 605, guide column; 606, support plate. DETAILED DESCRIPTION
[0025] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.
[0026] Embodiment one As Figures 1 to 4The application discloses a soil carbon dioxide gas collecting device, which comprises a handle frame 1 and a collecting tank 3. A drilling mechanism 2 is arranged below the handle frame 1. Valves 4 are arranged at the air inlet end and the air outlet end of the collecting tank 3. The valve 4 at the air inlet end of the collecting tank 3 is connected with an air pipe 5. A piston rod 6 is inserted into the collecting tank 3. The tail of the piston rod 6 is connected with a connecting piece 7. The upper end of the connecting piece 7 is connected with an electric push rod 8. The electric push rod 8 is fixedly installed on the collecting tank 3. The drilling mechanism 2 comprises a drill rod 201. The upper end of the drill rod 201 is rotatably connected with the handle frame 1. A driven gear 202 is fixedly sleeved on the drill rod 201. The driven gear 202 is engaged with a main gear 203. The main gear 203 is rotatably installed on the handle frame 1. A support frame 208 is arranged in the fixed sleeve. The upper end of the support frame 208 is fixedly connected with the inner wall of the handle frame 1. A threaded pipe 204 is rotatably installed in the support frame 208. The upper end of the threaded pipe 204 is rotatably connected with the end of the air pipe 5 through the top of the handle frame 1. A rectangular column 205 is screwed at the lower end of the threaded pipe 204. A drill bit 206 is rotatably connected with the lower end of the rectangular column 205. The upper end of the rectangular column 205 is movably inserted into the lower end of the support frame 208. Three air vents 2041 are formed in the threaded pipe 204.
[0027] Specific, drill bit 206 is a cone, drill pipe 201 inner bottom is a tapered cavity, the initial state, the conical surface on the drill bit 206 is in close contact with the tapered cavity of the inner bottom of the drill pipe 201, so that the lower end of the drill pipe 201 is blocked by the drill bit 206, and the two groups of valves 4 are in the closed state, when it is necessary to collect carbon dioxide gas in the soil, hold the handle frame 1, so that the drill bit 206 is opposite to the ground, then drive the main gear 203 to rotate through the motor, the main gear 203 drives the driven gear 202 to rotate together with the drill pipe 201 and the drill bit 206, as the drill pipe 201 and the drill bit 206 rotate, the drill pipe 201 and the drill bit 206 will gradually sink into the soil, until the drill bit 206 is deeply inserted into the soil to the specified depth, then open the valve 4 of the gas inlet end of the collection tank 3, then screw the threaded pipe 204, so that the rectangular column 205 drives the drill bit 206 to move upward, until the drill bit 206 completely enters the drill pipe 201, so that the lower end of the drill pipe 201 is opened, at this time, the electric push rod 8 is started, the electric push rod 8 pushes the connecting piece 7 together with the piston rod 6 to move, as the piston rod 6 moves, the carbon dioxide gas in the soil passes through the inner cavity of the drill pipe 201, the air vent 2041, the inner cavity of the threaded pipe 204, the air pipe 5 and the valve 4 in turn, and is finally sucked into the collection tank 3, until the carbon dioxide gas in the collection tank 3 reaches the specified amount, the valve 4 of the gas inlet end of the collection tank 3 is closed, the valve 4 of the gas outlet end of the collection tank 3 is opened, the electric push rod 8 pulls the piston rod 6 to move reversely, so that the carbon dioxide gas in the collection tank 3 is discharged from the valve 4 of the gas outlet end into the sample belt, thereby realizing the collection of carbon dioxide gas. Compared with the prior art, the drill pipe 201 and the drill bit 206 cause less disturbance to the surrounding soil during rotation, thereby avoiding the escape of a large amount of carbon dioxide gas in the soil, and secondly, the drill pipe 201 and the soil are in airtight state during the extraction of carbon dioxide gas in the soil, thereby avoiding the mixing of external gas into the collection tank 3, and improving the accuracy of the measurement of the amount of carbon dioxide in the soil.
[0028] As shown in Figure 5 The outer circle of the support frame 208 is provided with three groups of filter screens 2031 at equal angles.
[0029] Specifically, during the process that the carbon dioxide gas in the soil passes through the inner cavity of the drill pipe 201, the air vent 2041, the inner cavity of the threaded pipe 204, the air pipe 5 and the valve 4, the carbon dioxide gas passes through the filter screen 2031, and the solid impurities in the carbon dioxide gas are filtered out through the filter screen 2031, so as to ensure the cleanliness of the collected carbon dioxide gas.
[0030] As shown in Figures 6 to 9As shown, the drilling mechanism 2 further comprises a cleaning mechanism 207, the cleaning mechanism 207 comprises a fixed plate 2071 fixedly installed in the drill rod 201, an active plate 2072 is arranged below the fixed plate 2071, two groups of springs 2073 are arranged between the fixed plate 2071 and the active plate 2072, two groups of brushes 2074 are symmetrically distributed on both sides of the support frame 208, an active strip 2075 movably installed in the brush 2074, the active strip 2075 is fixedly connected with the active plate 2072 through the fixed plate 2071 at the lower end, two groups of storage grooves 2011 are symmetrically arranged on the inner ring of the drill rod 201, two groups of brushes 2074 are respectively inserted into the two groups of storage grooves 2011, an active groove 741 is arranged on the back side of the brush 2074, the active strip 2075 is slidably connected with the active groove 741, two groups of inclined grooves 751 are arranged on the active strip 2075, a pin shaft 752 is arranged in the inclined groove 751, the pin shaft 752 is fixedly installed in the active groove 741, guide holes 12 are arranged on the fixed plate 2071 and the active plate 2072, and the rectangular column 205 passes through the two groups of guide holes 12.
[0031] Specifically, after a long period of filtering, a layer of solid impurities will be attached to the filter screen 2031, which not only affects the passage of carbon dioxide gas through the filter screen 2031, but also reduces the service life of the filter screen 2031. In the initial state, the brush 2074 is not in contact with the filter screen 2031, so after the collection of carbon dioxide gas in the soil is completed, the drill rod 201 is separated from the soil, and then the threaded pipe 204 is continuously rotated, the rectangular column 205 and the drill bit 206 continue to move upward, the upper end of the drill bit 206 will be pressed to the active plate 2072, so that the active plate 2072 moves upward, and the active plate 2072 compresses the two groups of springs 2073, at the same time, the active plate 2072 pushes the two groups of active strips 2075 to move upward, under the guidance of the inclined groove 751, the pin shaft 752 drives the brush 2074 to move towards the filter screen 2031, until the fiber wire on the brush 2074 is pressed to the filter screen 2031, then the drill rod 201 is driven to rotate, the drill rod 201 will drive the brush 2074 to rotate around the filter screen 2031, so that the solid impurities of the filter screen 2031 are cleaned, thereby not only ensuring the smooth passage of carbon dioxide gas through the filter screen 2031, but also improving the service life of the filter screen 2031.
[0032] Example two As Figure 10As shown, the comparative example one, wherein another embodiment of the present application is: the piston rod 6 comprises a rod body 601, the rod body 601 head slidingly connected to the inner wall of the collection tank 3, the tail of the rod body 601 is fixedly connected to the connecting piece 7, the screw rod 602 is screwed in the inside of the rod body 601, the first plug 603 is fixedly installed at one end of the screw rod 602, the guide column 605 is arranged in front of the first plug 603, the second plug 604 is fixedly installed at one end of the guide column 605, the support plate 606 is arranged in the head of the rod body 601, the guide column 605 is movably inserted into the support plate 606, the flow channel 6011 is arranged in the inside of the rod body 601, and the screw rod 602 is screwed in the flow channel 6011.
[0033] Specifically, in the initial state, the inside of the flow channel 6011 is blocked by the first plug 603, and the first plug 603 is tightly attached to the guide column 605. During the process of cleaning the filter screen 2031, the screw rod 602 is rotated to drive the first plug 603 away from the guide column 605 and to remove the blockage of the first plug 603 to the inside of the flow channel 6011. Then, the valve 4 at the air inlet end of the collection tank 3 is opened, and the valve 4 at the air outlet end of the collection tank 3 is closed. The connecting piece 7 and the piston rod 6 are moved again by the electric push rod 8. During this process, the second plug 604 is separated from the port of the flow channel 6011, and the external air enters the collection tank 3 through the flow channel 6011. Then, the electric push rod 8 pulls the connecting piece 7 and the piston rod 6 back. Under the action of air pressure, the second plug 604 blocks the port of the flow channel 6011, and the air in the collection tank 3 will be pressed into the air pipe 5 and sprayed onto the filter screen 2031 through the air vent 2041. The cycle is repeated multiple times, which not only makes the solid impurities on the filter screen 2031 cleaner, but also forms an air current in the drill pipe 201. The solid impurities cleaned will be discharged from the lower end of the drill pipe 201 along with the air current, avoiding the accumulation of the cleaned solid impurities in the drill pipe 201.
[0034] Working principle: hold the handle frame 1, make the drill bit 206 face the ground, then drive the main gear 203 to rotate through the motor, the main gear 203 drives the driven gear 202 to rotate together with the drill rod 201 and the drill bit 206, as the drill rod 201 and the drill bit 206 rotate, the drill rod 201 and the drill bit 206 will gradually sink into the soil, until the drill bit 206 reaches the specified depth in the soil, then open the valve 4 at the air inlet end of the collection tank 3, then screw the threaded pipe 204, make the rectangular column 205 drive the drill bit 206 to move upwards, until the drill bit 206 is completely in the drill rod 201, so that the lower end of the drill rod 201 is opened, at this time, start the electric push rod 8, the electric push rod 8 pushes the connecting piece 7 and the piston rod 6 to move, as the piston rod 6 moves, the carbon dioxide gas in the soil passes through the drill rod 201 cavity, air hole 2041, threaded pipe 204 cavity, air pipe 5, valve 4 in turn, and finally is sucked into the collection tank 3, until the carbon dioxide gas in the collection tank 3 reaches the specified amount, close the valve 4 at the air inlet end of the collection tank 3, open the valve 4 at the air outlet end of the collection tank 3, make the electric push rod 8 pull the piston rod 6 to move reversely, make the carbon dioxide gas in the collection tank 3 discharge from the valve 4 at the air outlet end into the sample belt, so as to realize the collection of carbon dioxide gas; In the process of the above-mentioned carbon dioxide gas in the soil passing through the drill rod 201 cavity, air hole 2041, threaded pipe 204 cavity, air pipe 5, valve 4, the carbon dioxide gas will pass through the filter screen 2031, which filters out the solid impurities in the carbon dioxide gas; After the collection of carbon dioxide gas in the soil is completed, make the drill rod 201 separate from the soil, then continue to rotate the threaded pipe 204, the rectangular column 205 and the drill bit 206 continue to move upwards, the upper end of the drill bit 206 will be pressed to the movable plate 2072, make the movable plate 2072 move upwards, and the movable plate 2072 compresses two groups of springs 2073, at the same time, the movable plate 2072 pushes two groups of movable strips 2075 to move upwards, under the guidance of the inclined slot 751, make the pin shaft 752 drive the brush 2074 to move towards the filter screen 2031, until the fiber wire on the brush 2074 is pressed to the filter screen 2031, then drive the drill rod 201 to rotate, the drill rod 201 will drive the brush 2074 to rotate around the filter screen 2031, so that the solid impurities of the filter screen 2031 are cleaned away; In the process of cleaning the filter screen 2031, the screw 602 is rotated to drive the first plug 603 away from the guide column 605, and the first plug 603 is removed from the sealing of the inside of the flow channel 6011, then the valve 4 at the air inlet end of the collection tank 3 is opened, the valve 4 at the air outlet end of the collection tank 3 is closed, the connecting piece 7 together with the piston rod 6 is moved again by the electric push rod 8, in the process, the second plug 604 is separated from the port of the flow channel 6011, the external air enters the collection tank 3 through the flow channel 6011, then the electric push rod 8 pulls the connecting piece 7 together with the piston rod 6 back, under the action of air pressure, the second plug 604 seals the port of the flow channel 6011, the air in the collection tank 3 will be pressed into the air pipe 5, and sprayed onto the filter screen 2031 through the air vent 2041, and the cycle is repeated for several times.
[0035] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.
Claims
1. A soil carbon dioxide gas collection device, comprising a handle (1) and a collection tank (3), characterized in that: A drilling mechanism (2) is provided below the handle frame (1). Valves (4) are installed at both the air inlet and air outlet of the collection tank (3). The air inlet valve (4) of the collection tank (3) is connected to an air pipe (5). A piston rod (6) is inserted into the collection tank (3). A connector (7) is connected to the tail of the piston rod (6). An electric push rod (8) is connected to the upper end of the connector (7). The electric push rod (8) is fixedly installed on the collection tank (3). The drilling mechanism (2) includes a drill rod (201), and the upper end of the drill rod (201) is rotatably connected to the handle frame (1). A driven gear (202) is fixedly mounted on the drill rod (201), the driven gear (202) meshes with the main gear (203), and the main gear (203) is rotatably mounted on the handle bracket (1); A support frame (208) is placed inside the fixed sleeve, and the upper end of the support frame (208) is fixedly connected to the inner wall of the handle frame (1); The threaded pipe (204) is rotatably installed in the support frame (208). The upper end of the threaded pipe (204) passes through the top of the handle frame (1) and is rotatably connected to the end of the air pipe (5). Three sets of air ports (2041) are opened on the threaded pipe (204). The lower end of the threaded pipe (204) is screwed to a rectangular column (205), the lower end of the rectangular column (205) is rotatably connected to a drill bit (206), and the upper end of the rectangular column (205) is movably inserted into the lower end of the support frame (208).
2. The soil carbon dioxide gas collection device according to claim 1, characterized in that: Three sets of filter screens (2031) are installed at equal angles on the outer ring of the support frame (208).
3. The soil carbon dioxide gas collection device according to claim 2, characterized in that: The drilling mechanism (2) further includes a cleaning mechanism (207), which includes: A fixing plate (2071) is fixedly installed inside the drill rod (201); A movable plate (2072) is provided below the fixed plate (2071); Two sets of springs (2073) are provided between the fixed plate (2071) and the movable plate (2072); Two sets of brushes (2074) are symmetrically distributed on both sides of the support frame (208); The movable strip (2075) is installed inside the brush (2074); The lower end of the movable strip (2075) passes through the fixed plate (2071) and is fixedly connected to the movable plate (2072).
4. The soil carbon dioxide gas collection device according to claim 3, characterized in that: The drill rod (201) has two sets of storage slots (2011) symmetrically opened on its inner ring, and the two sets of brushes (2074) are respectively inserted into the two sets of storage slots (2011).
5. A soil carbon dioxide gas collection device according to claim 4, characterized in that: The brush (2074) has a movable groove (741) on its back side, and the movable strip (2075) is slidably connected to the movable groove (741).
6. The soil carbon dioxide gas collection device according to claim 5, characterized in that: The movable strip (2075) has two sets of inclined grooves (751), and a pin (752) is provided in the inclined groove (751). The pin (752) is fixedly installed in the movable groove (741).
7. A soil carbon dioxide gas collection device according to claim 6, characterized in that: Both the fixed plate (2071) and the movable plate (2072) are provided with guide holes (12), and the rectangular column (205) passes through the two sets of guide holes (12).
8. A soil carbon dioxide gas collection device according to claim 7, characterized in that: The piston rod (6) includes a rod body (601), the head of the rod body (601) is slidably connected to the inner wall of the collection tank (3), and the tail of the rod body (601) is fixedly connected to the connector (7). A screw (602) screwed inside the rod body (601); A first plug (603) is fixedly installed at one end of the screw (602); A guide post (605) is provided in front of the first plug (603); A second plug (604) is fixedly installed at one end of the guide post (605).
9. A soil carbon dioxide gas collection device according to claim 8, characterized in that: A support plate (606) is provided inside the head of the rod (601), and the guide post (605) is movably inserted into the support plate (606).
10. A soil carbon dioxide gas collection device according to claim 9, characterized in that: The rod body (601) has a flow channel (6011) inside, and the screw (602) is screwed into the flow channel (6011).