A soil sampling device for detecting grassland soil organic carbon

Abstract

The present invention discloses a soil sampling device for detecting organic carbon in grassland soil, which relates to the technical field of grassland soil detection. The device includes an unmanned aerial vehicle frame, a sampling assembly, a grass retaining assembly, and a cleaning assembly. The unmanned aerial vehicle frame is fixedly connected to two symmetrical landing frames via a bracket, and the unmanned aerial vehicle frame is fixedly connected to two symmetrical second electric push rods via a bracket. The present invention uses the cleaning assembly to effectively prevent soil remaining in a fixed barrel from a previous area from entering the next sample box when sampling the next area, thereby affecting the results of soil detection in the next area. The present invention uses the grass retaining assembly to enable the drill barrel to open the grass retaining plate while the second electric push rod drives the sampling assembly to descend for sampling. The grass retaining plate pushes the grass away, and most of the grass around the grass retaining plate is blocked outside the sampling range, effectively reducing the amount of grass entering the fixed barrel and reducing the workload of staff in clearing out the grass during the detection process.

Description

Technical Field

[0001] The present invention relates to the technical field of grassland soil detection, in particular to a soil sampling device for detecting organic carbon in grassland soil. Background Art

[0002] Organic carbon is a key indicator of grassland soil fertility. It improves soil structure, forms fine aggregates, increases aeration and water permeability, and promotes the growth and development of plant roots. Furthermore, the decomposition of organic carbon releases nutrients such as nitrogen, phosphorus, and potassium, providing a continuous supply of nutrients for grassland plants, promoting vegetation growth and increasing forage yield and quality.

[0003] With the advancement of technology, the sampling equipment used for grassland organic carbon monitoring is becoming increasingly advanced. The growing maturity of drone technology is allowing it to take over more traditional tasks. This revolution has significantly reduced manpower and material resources, and has made operations more convenient and efficient. Currently, drones are being used for soil sampling. Drones can quickly reach sampling locations and quickly return soil samples. Furthermore, with advancing technology, drones can also perform multi-site sampling, eliminating the need to first collect samples from one location and then travel to another, effectively reducing travel time.

[0004] However, these drones used for grassland soil sampling still have some drawbacks. For one thing, during the multi-site sampling process, drones fail to clean up residual soil from previous sampling, causing soil from different sampling areas to mix, seriously affecting the accuracy of soil testing. Furthermore, during sampling, large amounts of grass can easily be mixed into the samples. During soil testing, soil workers must diligently remove this grass to prevent it from interfering with the results, which undoubtedly increases their workload.

[0005] Based on this, a soil sampling device for detecting grassland soil organic carbon is now provided, which can eliminate the disadvantages of existing devices. Summary of the Invention

[0006] The purpose of the present invention is to provide a soil sampling device for detecting organic carbon in grassland soil, so as to solve the shortcomings of the current products in the background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A soil sampling device for detecting organic carbon in grassland soil, comprising an unmanned aerial vehicle (UAV) frame, a sampling assembly, a grass blocking assembly, and a cleaning assembly. The UAV frame is fixedly connected to two symmetrical landing frames via a bracket. The UAV frame is also fixedly connected to two symmetrical second electric push rods via a bracket. The output ends of the two second electric push rods are fixedly connected to a lifting plate.

[0009] The sampling assembly is arranged on a lifting plate and is used to sample and collect grassland soil in different areas;

[0010] The grass blocking assembly is arranged on the landing frame and is used to prevent a large amount of grass from entering the sampler during sampling;

[0011] The cleaning component is arranged on the drone frame and is used for cleaning the sampling component.

[0012] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0013] In an optional solution: the sampling assembly includes a third fixing plate and a fourth fixing plate, the upper surface of the lifting plate is fixedly connected to the fourth fixing plate via a bracket, the upper surface of the fourth fixing plate is fixedly connected to the third fixing plate via a bracket, the upper surface of the third fixing plate is fixedly connected to the second fixing plate via a bracket, and the upper surface of the second fixing plate is fixedly connected to the first fixing plate via a bracket;

[0014] The fourth fixed plate is fixedly connected to the first motor and the second motor through a bracket, the output end of the first motor is connected to the second rotating shaft, the first fixed plate and the second fixed plate are commonly connected to the first rotating shaft through a bearing, the third fixed plate and the fourth fixed plate are commonly connected to the drill barrel through a bearing, the inner wall of the drill barrel is slidingly provided with a fixed cylinder, the fixed cylinder is fixedly connected to the first fixed plate, and the fixed cylinder is connected to a lifting rod through a bearing, the part of the lifting rod located in the fixed cylinder is provided with a spiral blade, the part of the lifting rod located outside the fixed cylinder is transmission-connected to the first rotating shaft through a second synchronous belt drive component, the first rotating shaft is transmission-connected to the second rotating shaft through the first synchronous belt drive component, the circumferential side of the drill barrel is fixedly connected to the third gear, the second rotating shaft is fixedly connected to the first gear, and the first gear is meshed with the third gear.

[0015] In an optional scheme: the fourth fixed plate is fixedly connected to the second motor through a bracket, the output end of the second motor is connected to the second gear, the upper surface of the second fixed plate is connected to a placement plate through a bearing, the upper surface of the placement plate is provided with a plurality of sample box slots, and sample boxes are placed in the sample box slots, and the lower surface of the placement plate is fixedly connected with a gear ring, the gear ring passes through the second fixed plate, and the gear ring is meshed with the second gear, the side wall of the sample box is provided with a hole, the fixed cylinder is slidably connected to the outer side wall of the sample box, a feed hole is provided on the circumference of the fixed cylinder, the feed hole of the fixed cylinder and the hole of the sample box are at the same height, the placement plate is connected to a positioning plate by bolts, the fixed cylinder passes through the positioning plate, and the lower surface of the positioning plate abuts against the sample box.

[0016] In an optional scheme: the cleaning assembly includes a water tank and a water pumping box, the upper surface of the first fixed plate is fixedly connected to a lifting frame, the lifting frame is fixedly connected to a piston rod, the piston rod and the lifting rod are connected by a bearing, the upper surface of the unmanned frame is fixedly installed with a water tank and a water pumping box, the piston rod and the water pumping box are slidably connected, one end of the piston rod located in the water pumping box is fixedly connected to a piston plate, the lifting rod is provided with a water supply hole, a second water pipe is provided in the piston rod, the second water pipe is connected to the water supply hole of the lifting rod, the part of the second water pipe located in the water pumping box is connected to the first water pipe, the first water pipe is provided with a one-way valve, the water tank and the water pumping box are connected through a third water pipe, the third water pipe is provided with a one-way valve, and a plurality of water spray heads are provided around the lifting rod.

[0017] In an optional solution: a hanging ring is provided on the top wall of the water pumping box, and the first water pipe passes through the hanging ring.

[0018] In an optional solution: the grass guard assembly includes a mounting ring and a grass guard plate, the landing gear is fixedly connected to the mounting ring through a bracket, the mounting ring is fixedly connected to a fixing ring through a connecting frame, four grass guard plates are rotatably provided on the fixing ring, a coil spring is provided at the connection between the grass guard plate and the fixing ring, and a shielding cloth is connected between two adjacent grass guard plates.

[0019] In an optional solution: two air pipes are provided through the lower surface of the water pumping box, the air pipes pass through the lifting plate, and one end of the air pipe away from the water pumping box is provided through the grass guard plate.

[0020] In an optional solution: four first electric push rods facing each other are provided on the upper surface of the landing gear, and fixed drill bits are provided at the output ends of the first electric push rods.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention uses a cleaning component to effectively prevent the soil remaining in the fixed cylinder from the previous area from entering the next sample box when sampling the next area, thereby affecting the results of the soil detection in the next area.

[0023] 2. The present invention uses a grass barrier assembly. When the second electric push rod drives the sampling assembly to descend for sampling, the drill tube will open the grass barrier plate, and the grass barrier plate will push the grass away. Most of the grass around the grass barrier plate will be blocked outside the sampling range, effectively reducing the amount of grass entering the fixed tube and reducing the workload of the staff in cleaning out the grass during the inspection process.

[0024] 3. The present invention allows the air below the piston plate to be discharged to the position of the grass guard through the air pipe, so that the wind blows from the inside of the grass guard to the outside, causing the grass to bend outward, reducing the amount of grass rebounding into the grass guard, and further improving the grass blocking effect of the grass guard. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 This is a first viewing angle diagram of the present invention.

[0027] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle.

[0028] Figure 4 This is the first cross-sectional view of the present invention.

[0029] Figure 5 For the present invention Figure 4 Enlarged view of point B in the middle.

[0030] Figure 6 This is a second cross-sectional view of the present invention.

[0031] Figure 7 For the present invention Figure 6 Enlarged view of point C in the middle.

[0032] Figure 8 This is a schematic diagram of disassembling the sample box of the present invention.

[0033] Figure 9 It is a partial cross-sectional view of the water pumping box of the present invention.

[0034] Notes on figure numbers: 1 UAV frame, 2 landing gear, 3 water tank, 4 first electric push rod, 5 fixed drill bit, 6 second electric push rod, 7 water pumping box, 8 sampling assembly, 9 grass block assembly, 10 cleaning assembly, 11 drill barrel, 12 fixed barrel, 13 lifting rod, 14 placement plate, 15 positioning plate, 16 sample box, 17 first rotating shaft, 18 first synchronous belt drive, 19 first gear, 20 first motor, 21 second rotating shaft, 22 second synchronous belt drive, 23 second motor, 24 second gear, 25 ring gear, 26 lifting frame, 27 piston rod, 28 piston plate, 29 first water pipe, 30 second water pipe, 31 first fixed plate, 32 second fixed plate, 33 third fixed plate, 34 fourth fixed plate, 35 lifting plate, 36 air pipe, 37 mounting ring, 38 shielding cloth, 39 fixed ring, 40 grass block plate, 41 third gear, 42 third water pipe. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0036] In one embodiment, Figures 1-9 As shown, a soil sampling device for detecting organic carbon in grassland soil includes an unmanned aerial vehicle frame 1, a sampling assembly 8, a grass blocking assembly 9, and a cleaning assembly 10. The unmanned aerial vehicle frame 1 is fixedly connected to two symmetrical landing frames 2 via a bracket. The unmanned aerial vehicle frame 1 is fixedly connected to two symmetrical second electric push rods 6 via a bracket. The output ends of the two second electric push rods 6 are fixedly connected to a lifting plate 35.

[0037] The sampling assembly 8 is arranged on the lifting plate 35 and is used to sample and collect grassland soil in different areas;

[0038] The grass blocking component 9 is provided on the landing frame 2 and is used to prevent a large amount of grass from entering the sampler during sampling;

[0039] The cleaning component 10 is arranged on the drone frame 1 and is used to clean the sampling component 8 .

[0040] In one embodiment, the sampling assembly 8 includes a third fixing plate 33 and a fourth fixing plate 34. The upper surface of the lifting plate 35 is fixedly connected to the fourth fixing plate 34 via a bracket. The upper surface of the fourth fixing plate 34 is fixedly connected to the third fixing plate 33 via a bracket. The upper surface of the third fixing plate 33 is fixedly connected to the second fixing plate 32 via a bracket. The upper surface of the second fixing plate 32 is fixedly connected to the first fixing plate 31 via a bracket.

[0041] The fourth fixed plate 34 is fixedly connected to the first motor 20 and the second motor 23 through a bracket, the output end of the first motor 20 is connected to the second rotating shaft 21, the first fixed plate 31 and the second fixed plate 32 are commonly connected to the first rotating shaft 17 through a bearing, the third fixed plate 33 and the fourth fixed plate 34 are commonly connected to the drill barrel 11 through a bearing, a fixed cylinder 12 is slidingly provided on the inner wall of the drill barrel 11, the fixed cylinder 12 is fixedly connected to the first fixed plate 31, the fixed cylinder 12 is connected to the lifting rod 13 through a bearing, the part of the lifting rod 13 located in the fixed cylinder 12 is provided with a spiral blade, the part of the lifting rod 13 located outside the fixed cylinder 12 is transmission-connected to the first rotating shaft 17 through a second synchronous belt drive 22, the first rotating shaft 17 is transmission-connected to the second rotating shaft 21 through a first synchronous belt drive 18, the third gear 41 is fixedly connected to the peripheral side of the drill barrel 11, the second rotating shaft 21 is fixedly connected to the first gear 19, and the first gear 19 is meshed with the third gear 41.

[0042] Then, the second electric push rod 6 is started, and the second electric push rod 6 drives the sampling assembly 8 to descend. At the same time, the first motor 20 is started. The rotation of the first motor 20 drives the second rotating shaft 21 to rotate. The second rotating shaft 21 drives the first gear 19 to rotate. The first gear 19 cooperates with the third gear 41 to drive the drill barrel 11 to rotate. The drill barrel 11 cooperates with the conical structure located below the drill barrel 11, allowing the drill barrel 11 to easily enter the soil for sampling.

[0043] While the second rotating shaft 21 rotates, the lifting rod 13 is driven to rotate through the cooperation of the first synchronous belt driving member 18, the first rotating shaft 17, and the second synchronous belt driving member 22. The rotation of the lifting rod 13 drives the soil entering the fixed cylinder 12 to be lifted upward. When it reaches the top, it enters the sample box 16 through the feed hole, completing the collection of a regional sample.

[0044] In one embodiment, the fourth fixed plate 34 is fixedly connected to the second motor 23 through a bracket, the output end of the second motor 23 is connected to the second gear 24, the upper surface of the second fixed plate 32 is connected to the placement plate 14 through a bearing, the upper surface of the placement plate 14 is provided with a plurality of sample box slots, and the sample box 16 is placed in the sample box slots, the lower surface of the placement plate 14 is fixedly connected with a ring gear 25, the ring gear 25 passes through the second fixed plate 32, and the ring gear 25 is engaged with the second gear 24, the side wall of the sample box 16 is provided with a hole, the fixed cylinder 12 is slidably connected to the outer wall of the sample box 16, a feed hole is provided on the peripheral side of the fixed cylinder 12, the feed hole of the fixed cylinder 12 and the hole of the sample box 16 are at the same height, the placement plate 14 is connected to the positioning plate 15 by bolts, the fixed cylinder 12 passes through the positioning plate 15, and the lower surface of the positioning plate 15 abuts against the sample box 16.

[0045] After the sampling is completed, the second electric push rod 6 is started again. While the second electric push rod 6 drives the sampling assembly 8 to rise, the second motor 23 is started by program control. The second motor 23 drives the placement plate 14 to rotate one unit through the cooperation of the second gear 24 and the ring gear 25, so that the next sample box 16 is located at the feeding hole of the fixed cylinder 12, which facilitates the collection of grassland soil in the next area.

[0046] After sampling, the bolts of the positioning plate 15 can be removed, the positioning plate 15 can be lifted, and the six sample boxes 16 can be taken out and sent to the testing site for testing. The positioning plate 15 can fix the sample boxes 16 to prevent the sample boxes 16 from falling during flight.

[0047] In one embodiment, the cleaning assembly 10 includes a water tank 3 and a water pumping box 7. The upper surface of the first fixed plate 31 is fixedly connected to a lifting frame 26, and the lifting frame 26 is fixedly connected to a piston rod 27. The piston rod 27 is connected to the lifting rod 13 through a bearing. The water tank 3 and the water pumping box 7 are fixedly installed on the upper surface of the unmanned frame 1. The piston rod 27 is slidably connected to the water pumping box 7. One end of the piston rod 27 located in the water pumping box 7 is fixedly connected to the piston plate 28. The lifting rod 13 is provided with a water supply hole. A second water pipe 30 is provided in the piston rod 27. The second water pipe 30 is connected to the water supply hole of the lifting rod 13. The part of the second water pipe 30 located in the water pumping box 7 is connected to the first water pipe 29. The first water pipe 29 is provided with a one-way valve. The water tank 3 and the water pumping box 7 are connected through a third water pipe 42. The third water pipe 42 is provided with a one-way valve. Several water spray heads are provided around the lifting rod 13.

[0048] While the second electric push rod 6 drives the sampling assembly 8 to descend for sampling, the second water pipe 30 drives the piston rod 27 to descend, and the piston rod 27 drives the piston plate 28 to descend, so that the water in the water tank 3 is pumped into the water pumping box 7 through the third water pipe 42. In the process of the second electric push rod 6 driving the sampling assembly 8 to ascend to end the sampling, the second water pipe 30 drives the piston rod 27 to ascend, and the piston rod 27 drives the piston plate 28 to ascend, so that the water in the water pumping box 7 flows into the lifting rod 13 through the first water pipe 29 and the second water pipe 30, and then is sprayed out from the nozzle on the side of the lifting rod 13 to wash the inner wall of the fixed cylinder 12;

[0049] During the flushing process, the first motor 20 can be started in reverse to rotate the lifting rod 13 in the reverse direction, so as to discharge the soil in the fixed cylinder 12 that has not entered the sample box 16 and flush it out of the fixed cylinder 12 with the water flow, thereby completing the cleaning operation. This effectively prevents the soil remaining in the fixed cylinder 12 of the previous area from entering the next sample box 16 when sampling the next area, thereby affecting the results of the soil detection in the next area.

[0050] In one embodiment, a hanging ring is provided on the top wall of the water pumping box 7, and the first water pipe 29 runs through the hanging ring to prevent water from entering the lifting rod 13 during the water pumping process.

[0051] In one embodiment, the grass guard assembly 9 includes a mounting ring 37 and a grass guard plate 40. The landing gear 2 is fixedly connected to the mounting ring 37 through a bracket, and the mounting ring 37 is fixedly connected to the fixing ring 39 through a connecting frame. The fixing ring 39 is rotatably provided with four grass guard plates 40. A coil spring is provided at the connection between the grass guard plate 40 and the fixing ring 39, and a shielding cloth 38 is connected between two adjacent grass guard plates 40.

[0052] Due to the provision of the shielding cloth 38 , when the grass guard panels 40 are in the unfolded state, grass can be prevented from penetrating into the interior of the grass guard panels 40 through the gap between two adjacent grass guard panels 40 .

[0053] The coil spring is used to drive the grass guard plate 40 to reset.

[0054] While the second electric push rod 6 drives the sampling assembly 8 to descend for sampling, the drill barrel 11 will open the grass baffle 40, and the grass baffle 40 will push the grass away. Most of the grass around the grass baffle 40 will be blocked outside the sampling range, effectively reducing the amount of grass entering the fixed barrel 12 and reducing the workload of the staff in cleaning out the grass during the inspection process.

[0055] In one embodiment, two air pipes 36 are provided through the lower surface of the water pumping box 7 . The air pipes 36 pass through the lifting plate 35 , and one end of the air pipes 36 away from the water pumping box 7 is provided through the grass baffle 40 .

[0056] While the second electric push rod 6 drives the sampling assembly 8 to descend for sampling, since the cleaning assembly 10 is performing a pumping operation simultaneously, the piston plate 28 descends, and the air below the piston plate 28 is discharged to the position of the grass baffle 40 through the air pipe 36, allowing the wind to blow outward from the inside of the grass baffle 40, causing the grass to bend outward, reducing the amount of grass that bounces back into the grass baffle 40, and further improving the effect of the grass baffle 40 in blocking grass.

[0057] In one embodiment, four first electric push rods 4 are provided on the upper surface of the landing gear 2 , and four first electric push rods 4 are provided at the output ends of the first electric push rods 4 .

[0058] The UAV is landed in the area to be inspected on the grassland, and the first electric push rod 4 is started first. The first electric push rod 4 drives the fixed drill bit 5 to descend and drill into the soil to complete the fixation of the UAV.

[0059] The above embodiment discloses a soil sampling device for detecting organic carbon in grassland soil. The specific working principle and process are as follows:

[0060] S1: Land the drone in the area to be inspected on the grassland. Start the first electric push rod 4, which drives the fixed drill bit 5 to descend and drill into the soil to fix the drone.

[0061] S2: Start the second electric push rod 6 again, and the second electric push rod 6 drives the sampling assembly 8 to descend. At the same time, start the first motor 20. The rotation of the first motor 20 drives the second rotating shaft 21 to rotate. The second rotating shaft 21 drives the first gear 19 to rotate. The first gear 19 cooperates with the third gear 41 to drive the drill barrel 11 to rotate. The drill barrel 11 cooperates with the conical structure located below the drill barrel 11, so that the drill barrel 11 can easily enter the soil for sampling.

[0062] As the second rotating shaft 21 rotates, the lifting rod 13 is driven to rotate by the cooperation of the first synchronous belt driving member 18, the first rotating shaft 17, and the second synchronous belt driving member 22. The rotation of the lifting rod 13 drives the soil entering the fixed cylinder 12 to be lifted upward. When it reaches the top, it enters the sample box 16 through the feed hole, completing the collection of samples for one area.

[0063] S3: After the sampling is completed, the second electric push rod 6 is started again. While the second electric push rod 6 drives the sampling assembly 8 to rise, the second motor 23 is started by program control. The second motor 23 drives the placement plate 14 to rotate one unit through the cooperation of the second gear 24 and the ring gear 25, so that the next sample box 16 is located at the feeding hole of the fixed cylinder 12, which facilitates the collection of grassland soil in the next area;

[0064] S4: After sampling, the bolts of the positioning plate 15 can be removed, the positioning plate 15 can be lifted, and the six sample boxes 16 can be taken out and sent to the testing site for testing. The positioning plate 15 can fix the sample boxes 16 to prevent the sample boxes 16 from falling during flight.

[0065] In addition, while the second electric push rod 6 drives the sampling assembly 8 to descend for sampling, the second water pipe 30 drives the piston rod 27 to descend, and the piston rod 27 drives the piston plate 28 to descend, so that the water in the water tank 3 is pumped into the water pumping box 7 through the third water pipe 42. In the process of the second electric push rod 6 driving the sampling assembly 8 to ascend to end the sampling, the second water pipe 30 drives the piston rod 27 to ascend, and the piston rod 27 drives the piston plate 28 to ascend, so that the water in the water pumping box 7 flows into the lifting rod 13 through the first water pipe 29 and the second water pipe 30, and then is sprayed out from the nozzle on the side of the lifting rod 13 to wash the inner wall of the fixed cylinder 12;

[0066] During the flushing process, the first motor 20 can be started in reverse to rotate the lifting rod 13 in the reverse direction, thereby discharging the soil in the fixed cylinder 12 that has not entered the sample box 16 and flushing it out of the fixed cylinder 12 with the water flow, thus completing the cleaning operation. This effectively prevents the soil remaining in the fixed cylinder 12 from the previous area from entering the next sample box 16 when sampling the next area, thereby affecting the soil detection results of the next area.

[0067] In addition, while the second electric push rod 6 drives the sampling assembly 8 to descend for sampling, the drill tube 11 will open the grass baffle 40, and the grass baffle 40 will push the grass away. Most of the grass around the grass baffle 40 will be blocked outside the sampling range, effectively reducing the amount of grass entering the fixed tube 12 and reducing the workload of the staff in clearing out the grass during the inspection process;

[0068] In addition, while the second electric push rod 6 drives the sampling assembly 8 to descend for sampling, the cleaning assembly 10 is simultaneously performing a pumping operation, and the piston plate 28 descends. The air below the piston plate 28 is discharged to the position of the grass deflector 40 through the air pipe 36, so that the wind blows from the inside of the grass deflector 40 to the outside, causing the grass to bend outward, thereby reducing the amount of grass that rebounds into the grass deflector 40, and further improving the grass blocking effect of the grass deflector 40;

[0069] Furthermore, due to the provision of the shielding cloth 38 , when the grass guard panels 40 are in the unfolded state, grass can be prevented from penetrating into the interior of the grass guard panels 40 through the gap between two adjacent grass guard panels 40 .

[0070] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A soil sampling device for detecting grassland soil organic carbon, characterized in that: The unmanned aerial vehicle frame (1) comprises an unmanned aerial vehicle frame (1), a sampling assembly (8), a grass blocking assembly (9), and a cleaning assembly (10); the unmanned aerial vehicle frame (1) is fixedly connected to two symmetrical landing frames (2) via a bracket; the unmanned aerial vehicle frame (1) is fixedly connected to two symmetrical second electric push rods (6) via a bracket; and the output ends of the two second electric push rods (6) are fixedly connected to a lifting plate (35) in common. The sampling assembly (8) is arranged on the lifting plate (35) and is used to sample and collect grassland soil in different areas; The grass blocking assembly (9) is arranged on the landing frame (2) and is used to prevent a large amount of grass from entering the sampler during sampling; The cleaning component (10) is arranged on the drone frame (1) and is used to clean the sampling component (8); The sampling assembly (8) includes a third fixing plate (33) and a fourth fixing plate (34), the upper surface of the lifting plate (35) is fixedly connected to the fourth fixing plate (34) via a bracket, the upper surface of the fourth fixing plate (34) is fixedly connected to the third fixing plate (33) via a bracket, the upper surface of the third fixing plate (33) is fixedly connected to the second fixing plate (32) via a bracket, and the upper surface of the second fixing plate (32) is fixedly connected to the first fixing plate (31) via a bracket; The fourth fixed plate (34) is fixedly connected to the first motor (20) and the second motor (23) through a bracket, the output end of the first motor (20) is connected to the second rotating shaft (21), the first fixed plate (31) and the second fixed plate (32) are connected to the first rotating shaft (17) through a bearing, the third fixed plate (33) and the fourth fixed plate (34) are connected to the drill tube (11) through a bearing, a fixed tube (12) is slidably provided on the inner wall of the drill tube (11), the fixed tube (12) is fixedly connected to the first fixed plate (31), and the fixed tube (12) is connected to the first fixed plate (31) through a bearing. A lifting rod (13) is connected, and a portion of the lifting rod (13) located inside the fixed cylinder (12) is provided with a spiral blade. A portion of the lifting rod (13) located outside the fixed cylinder (12) is connected to the first rotating shaft (17) through a second synchronous belt drive (22), and the first rotating shaft (17) is connected to the second rotating shaft (21) through a first synchronous belt drive (18). A third gear (41) is fixedly connected to the peripheral side of the drill cylinder (11), and the second rotating shaft (21) is fixedly connected to the first gear (19), and the first gear (19) is meshed with the third gear (41); The fourth fixed plate (34) is fixedly connected to the second motor (23) through a bracket, and the output end of the second motor (23) is connected to the second gear (24). The upper surface of the second fixed plate (32) is connected to the placement plate (14) through a bearing. The upper surface of the placement plate (14) is provided with a plurality of sample box slots, and the sample boxes (16) are placed in the sample box slots. The lower surface of the placement plate (14) is fixedly connected to a gear ring (25), and the gear ring (25) passes through the second fixed plate (32). The gear ring ( 25) is meshed with the second gear (24), a hole is provided on the side wall of the sample box (16), the fixed cylinder (12) is slidably connected to the outer side wall of the sample box (16), a feed hole is provided on the circumference of the fixed cylinder (12), the feed hole of the fixed cylinder (12) and the hole of the sample box (16) are located at the same height, the placement plate (14) is connected to the positioning plate (15) by bolts, the fixed cylinder (12) passes through the positioning plate (15), and the lower surface of the positioning plate (15) is in contact with the sample box (16); The cleaning assembly (10) comprises a water tank (3) and a water pumping box (7); the upper surface of the first fixed plate (31) is fixedly connected to a lifting frame (26); the lifting frame (26) is fixedly connected to a piston rod (27); the piston rod (27) is connected to the lifting rod (13) via a bearing; the upper surface of the unmanned frame (1) is fixedly mounted with a water tank (3) and a water pumping box (7); the piston rod (27) is slidably connected to the water pumping box (7); one end of the piston rod (27) located in the water pumping box (7) is fixedly connected to a piston plate ( 28), the lifting rod (13) is provided with a water delivery hole, the piston rod (27) is provided with a second water pipe (30), the second water pipe (30) is connected to the water delivery hole of the lifting rod (13), the part of the second water pipe (30) located in the water pumping box (7) is connected to the first water pipe (29), the first water pipe (29) is provided with a one-way valve, the water tank (3) and the water pumping box (7) are connected through a third water pipe (42), the third water pipe (42) is provided with a one-way valve, and a plurality of water spray heads are provided on the periphery of the lifting rod (13); The grass-blocking assembly (9) comprises a mounting ring (37) and grass-blocking plates (40); the landing gear (2) is fixedly connected to the mounting ring (37) via a bracket; the mounting ring (37) is fixedly connected to a fixing ring (39) via a connecting frame; the fixing ring (39) is rotatably provided with four grass-blocking plates (40); a coil spring is provided at the connection between the grass-blocking plates (40) and the fixing ring (39); and a shielding cloth (38) is connected between two adjacent grass-blocking plates (40).

2. A soil sampling device for detecting grassland soil organic carbon according to claim 1, characterized in that: The inner top wall of the water pumping box (7) is provided with a hanging ring, and the first water pipe (29) passes through the hanging ring.

3. A soil sampling device for detecting grassland soil organic carbon according to claim 1, characterized in that: Two air pipes (36) are provided through the lower surface of the water pumping box (7), the air pipes (36) pass through the lifting plate (35), and one end of the air pipe (36) away from the water pumping box (7) is provided through the grass retaining plate (40).

4. A soil sampling device for detecting grassland soil organic carbon according to claim 1, characterized in that: Four first electric push rods (4) facing each other are provided on the upper surface of the landing frame (2), and a fixed drill bit (5) is provided at the output end of the first electric push rod (4).

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