Soil sampling device based on grassland soil nitrogen conversion research

Abstract

The invention relates to the technical field of sampling, in particular to a soil sampling device based on grassland soil nitrogen conversion research, and solves the problems that a soil sample collected by an existing soil sampling device is integrally cylindrical, and in order to facilitate subsequent research, the soil sample needs to be manually segmented and stored in different storage containers, so that the working efficiency is high, and the like. The problems that an existing soil sampling device is provided with only one motor serving as a main driving source, and when the motor breaks down, the whole device cannot be used are solved. Comprising a soil sampler support. Soil of different depths can be sampled at a time through the full-automatic layered sampling mechanism, the soil is stored into different sampling sleeves one by one, and a driving motor serving as a main power source can be automatically switched through the dual-power driving mechanism; according to the technical scheme, the flexibility of the equipment is improved, and the convenience of the equipment is enhanced.

Description

Technical Field

[0001] The invention relates to the technical field of sampling, in particular to a soil sampling device for research on nitrogen transformation in grassland soil. Background Art

[0002] Grassland soil nitrogen transformation is an important part of the nitrogen cycle in grassland ecosystems. It is mainly carried out in grassland ecosystems through two ways: plant symbiotic nitrogen fixation and natural nitrogen fixation. Plant symbiotic nitrogen fixation refers to the symbiosis between some plants and rhizosphere nitrogen-fixing bacteria, which convert nitrogen gas into ammonia that can be absorbed and utilized by plants through the action of mycorrhizal nitrogen-fixing bacteria. Natural nitrogen fixation refers to some free-living nitrogen-fixing microorganisms converting nitrogen gas in the atmosphere into ammonia. The ammonia nitrogen and nitrate nitrogen produced by nitrogen transformation are important nitrogen sources for plant growth. They can be absorbed by plant roots and used in the process of growth and development. The nitrogen transformation process will change the nitrogen form and content in the soil, thereby affecting the soil fertility level. For example, denitrification will lead to nitrogen loss and reduce soil fertility, while nitrification can increase the nitrate content in the soil and increase soil fertility. In order to study grassland soil nitrogen transformation, it is necessary to use a soil sampling device to sample the soil on the grassland, and use a variety of different instruments in the experiment to analyze the specific components of soil samples at different depths. This soil sampling device used for grassland soil nitrogen transformation research can be called a soil sampling device for grassland soil nitrogen transformation research.

[0003] However, the soil samples collected by the existing soil sampling device are connected together and are cylindrical in shape. In order to facilitate subsequent research, the soil samples need to be manually divided and stored in different storage containers, which is cumbersome to operate. In addition, the existing soil sampling device has only one motor as the main driving source. When the motor fails, the entire device cannot be used. This may lead to the situation that when arriving at the sampling area and all preparations are completed, the motor is found to have failed during the sampling operation, resulting in the inability to perform the sampling operation. Therefore, it does not meet the existing needs. In this regard, we propose a soil sampling device for grassland soil nitrogen transformation research. Summary of the invention

[0004] The purpose of the present invention is to provide a soil sampling device for grassland soil nitrogen transformation research, so as to solve the problem that the soil samples collected by the existing soil sampling device proposed in the above background technology are connected together and are cylindrical as a whole. In order to facilitate subsequent research, it is necessary to manually divide the soil samples and store them in different storage containers. The operation is relatively cumbersome, and the existing soil sampling device has only one motor as the main driving source. When this motor fails, the entire device cannot be used. This may lead to the situation that when arriving at the sampling area and all preparations are completed, but when the sampling operation is carried out, it is found that the motor has failed, resulting in the inability to carry out the sampling operation.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a soil sampling device for grassland soil nitrogen transformation research, comprising a soil sampler bracket, a dual-power drive mechanism is fixedly installed on one side of the rear end face of the soil sampler bracket, and the dual-power drive mechanism comprises two drive motors, two square drive shafts, two circular plates, two square through holes, two first upper tooth connecting rings, a first drive sprocket, two annular grooves, two second upper tooth connecting rings and two motor connecting mechanisms, the two annular grooves are respectively located at the middle positions of the upper and lower end faces of the first drive sprocket, and the two second upper tooth connecting rings are respectively fixed inside the two annular grooves; The two driving motors are respectively located above and below the first driving sprocket, the two square driving shafts are respectively connected to the two driving motors, the two square through holes are respectively located on the outer surfaces of the two circular plates, the circular plates are movably sleeved on the outer surfaces of the square driving shafts through the square through holes, and the two first upper tooth connecting rings are respectively fixed to the surfaces of the two circular plates facing the first driving sprocket, the top ends of the second upper tooth connecting ring and the tooth heads of the first upper tooth connecting ring are both arc-shaped, and the motor connecting mechanism can push the first upper tooth connecting ring toward the direction of the second upper tooth connecting ring; A fully automatic stratified sampling mechanism is provided on one side of the dual-power drive mechanism, and the fully automatic stratified sampling mechanism includes a sampling drill rod, multiple sampling sleeves, storage slots having the same number as the sampling sleeves, and a synchronous drive mechanism. The multiple storage slots are respectively located on the front and rear end surfaces of the sampling drill rod, and the multiple sampling sleeves are respectively located inside the multiple storage slots. The synchronous drive mechanism can synchronously drive all the sampling sleeves to rotate and move outward or inward.

[0006] Preferably, the dual-power drive mechanism further comprises two connecting and fixing plates, the upper end surfaces of the two connecting and fixing plates are fixedly connected with a driving motor mounting plate, the lower end surfaces of the two connecting and fixing plates are also fixedly connected with a driving motor mounting plate, and the surfaces of the connecting and fixing plates facing the first driving sprocket are connected to the first driving sprocket via roller bearings; A driving shaft is arranged on one side of the first driving sprocket, a second driving sprocket is arranged on an upper fixed sleeve on the outer surface of the driving shaft, and the second driving sprocket is connected in series with the first driving sprocket via a driving chain.

[0007] Preferably, the motor connection mechanism comprises two connection cylinders, and a roller bearing connection plate connected to the circular plate via a roller bearing is fixedly connected to the piston rods of the two connection cylinders.

[0008] Preferably, the inner wall cross-section of the square through hole is a square, the outer surface of the square driving shaft fits with the inner wall of the square through hole, and the square driving shaft is slidably connected to the square through hole.

[0009] Preferably, the fully automatic stratified sampling mechanism also includes a drill bit, and the drill bit is fixed to the lower end surface of the sampling drill rod.

[0010] Preferably, a sealing sleeve movably mounted on the outer surface of the sampling drill rod is provided above the drill bit, and the front and rear end surfaces of the sealing sleeve are provided with a plurality of sampling through holes, the number of the sampling through holes is the same as the storage groove and the positions of the sampling through holes correspond to the positions of the storage groove.

[0011] Preferably, a pushing cylinder is fixedly installed on both sides of the inner top end of the sampling drill rod, and the piston rod of the pushing cylinder is fixed to the inner wall of the sealing sleeve.

[0012] Preferably, the synchronous drive mechanism includes a stepper motor, the output shaft of the stepper motor is connected to a transmission shaft via a coupling, a plurality of first bevel gears are fixedly sleeved on the outer surface of the transmission shaft, and the number of the first bevel gears is one-half of the number of the storage slots.

[0013] Preferably, a second bevel gear is meshed on both sides of the outer surface of the first bevel gear, the axis of the second bevel gear is connected to a gear transmission shaft, one end of the gear transmission shaft is fixedly connected to a square shaft, the outer side of the top end of the square shaft is provided with an internal thread transmission groove located inside the sampling drill rod, the interior of the internal thread transmission groove is provided with a threaded transmission rod matching its internal thread, the surface of the threaded transmission rod facing the gear transmission shaft is provided with a square slot, and the square shaft is inserted into the interior of the square slot, the inner wall cross-section of the square slot is square, the outer surface of the square shaft is in contact with the inner wall of the square slot, and the square shaft is slidably connected to the square slot.

[0014] Preferably, a mounting plate is fixedly provided on the surface of the threaded transmission rod facing the nearest sampling sleeve, an external threaded connector is fixedly provided on the surface of the mounting plate facing the nearest sampling sleeve, an internal threaded connector groove is provided on the outer side of the external threaded connector and is located on the outer surface of the sampling sleeve, and the external thread of the external threaded connector matches the internal thread of the internal threaded connector groove; The inlet of the sampling sleeve is an inclined surface.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention can sample soil of different depths at one time through the fully automatic stratified sampling mechanism, and store the samples one by one in different sampling sleeves. The above technical solution increases the convenience of the equipment, so that the entire cylindrical sample does not need to be divided during the sampling process; 2. The present invention can automatically replace the drive motor used as the total power source through the dual-power drive mechanism. When the drive motor being used fails and cannot perform sampling operations when arriving at the sampling area, another drive motor can be used as the total power source. The above technical solution improves the flexibility of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a front view of the internal structure of the present invention; Figure 3 For the present invention Figure 2 A magnified view of the structure at center A; Figure 4 For the present invention Figure 3 A magnified view of the structure at B in the middle; Figure 5 For the present invention Figure 2 A magnified view of the structure at C in the middle; Figure 6 For the present invention Figure 5 Enlarged view of the structure at D in the middle.

[0017] In the figure: 1. soil sampler bracket; 2. fully automatic layered sampling mechanism; 201. sampling drill rod; 202. sealing sleeve; 203. sampling through hole; 204. pushing cylinder; 205. stepping motor; 206. transmission shaft; 207. first bevel gear; 208. second bevel gear; 209. gear transmission shaft; 210. square shaft; 211. threaded transmission rod; 212. square slot; 213. mounting plate; 214. external thread connector; 215. sampling sleeve; 216 , internal thread connecting groove; 217, drill bit; 218, inclined surface; 219, internal thread transmission groove; 220, storage groove; 3, drive motor mounting plate; 4, connecting fixing plate; 5, drive motor; 6, square drive shaft; 7, circular plate; 8, square through hole; 9, first upper tooth connecting ring; 10, connecting cylinder; 11, first drive sprocket; 12, annular groove; 13, second upper tooth connecting ring; 14, drive chain; 15, second drive sprocket; 16, drive shaft; 17, roller bearing connecting plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] See also Figures 1 to 6 , an embodiment provided by the present invention: a soil sampling device for grassland soil nitrogen transformation research, comprising a soil sampler bracket 1, a dual-power drive mechanism is fixedly installed on one side of the rear end surface of the soil sampler bracket 1, and the dual-power drive mechanism comprises two drive motors 5, two square drive shafts 6, two circular plates 7, two square through holes 8, two first upper tooth connecting rings 9, a first drive sprocket 11, two annular grooves 12, two second upper tooth connecting rings 13 and two motor connecting mechanisms, the two annular grooves 12 are respectively located in the middle of the upper and lower end surfaces of the first drive sprocket 11, and the two second upper tooth connecting rings 13 are respectively fixed inside the two annular grooves 12; The two driving motors 5 are respectively located above and below the first driving sprocket 11, the two square driving shafts 6 are respectively connected to the two driving motors 5, the two square through holes 8 are respectively located on the outer surfaces of the two circular plates 7, the circular plates 7 are movably sleeved on the outer surfaces of the square driving shafts 6 through the square through holes 8, and the two first upper tooth connecting rings 9 are respectively fixed to the surfaces of the two circular plates 7 facing the first driving sprocket 11, the top ends of the second upper tooth connecting ring 13 and the tooth heads of the first upper tooth connecting ring 9 are both arc-shaped, and the motor connecting mechanism can push the first upper tooth connecting ring 9 toward the direction of the second upper tooth connecting ring 13.

[0020] The motor connection mechanism includes two connection cylinders 10, and a roller bearing connection plate 17 connected to the circular plate 7 through a roller bearing is fixedly connected to the piston rods of the two connection cylinders 10; when the equipment needs to be used, the two connection cylinders 10 located in the upper motor connection mechanism are first started, and the roller bearing connection plate 17 connected thereto can be pushed toward the first drive sprocket 11 through the connection cylinder 10, and the movement of the roller bearing connection plate 17 causes the circular plate 7 connected thereto through the roller bearing and the first upper tooth connection ring 9 fixed on the outer surface of the circular plate 7 to match with the second upper tooth connection ring 13 located inside the annular groove 12 on the outer surface of the first drive sprocket 11, and the arc-shaped tooth heads located on the outer surfaces of the second upper tooth connection ring 13 and the first upper tooth connection ring 9 can prevent the second upper tooth connection ring 13 from directly colliding with the tooth heads on the first upper tooth connection ring 9, thereby preventing the two from matching; The inner wall cross-section of the square through hole 8 is a square, the outer surface of the square driving shaft 6 is in contact with the inner wall of the square through hole 8, and the square driving shaft 6 is slidingly connected to the square through hole 8; when the first upper tooth connecting ring 9 and the second upper tooth connecting ring 13 are in contact with each other, the corresponding driving motor 5 is started, and the driving motor 5 can drive the square driving shaft 6 connected thereto to rotate. Since the outer surface of the square driving shaft 6 is in contact with the inner wall of the square through hole 8 located on the outer surface of the circular plate 7, when the square driving shaft 6 rotates, the circular plate 7 will rotate therewith, and the rotating circular plate 7 can drive the first upper tooth connecting ring 9 fixed thereto and the second upper tooth connecting ring 13 matched thereto to rotate, and the rotating second upper tooth connecting ring 13 can drive the first driving sprocket 11 fixed thereto to rotate.

[0021] The dual-power drive mechanism also includes two connecting and fixing plates 4, the upper end surfaces of the two connecting and fixing plates 4 are fixedly connected with a driving motor mounting plate 3, the lower end surfaces of the two connecting and fixing plates 4 are also fixedly connected with a driving motor mounting plate 3, and the surfaces of the connecting and fixing plates 4 facing the first driving sprocket 11 are connected to the first driving sprocket 11 through roller bearings; the first driving sprocket 11 can be supported in mid-air by the two connecting and fixing plates 4 to prevent it from being misplaced; A driving shaft 16 is provided on one side of the first driving sprocket 11, and a second driving sprocket 15 is provided on the upper fixed sleeve of the outer surface of the driving shaft 16, and the second driving sprocket 15 is connected in series with the first driving sprocket 11 through a driving chain 14; when the first driving sprocket 11 rotates, the second driving sprocket 15 connected in series with it through the driving chain 14 and the driving shaft 16 fixed inside the driving shaft 16 will rotate together, and the rotating driving shaft 16 can drive the fully automatic stratified sampling mechanism 2 connected thereto to rotate together, so as to perform sampling operations; When the driving motor 5 located at the top fails, the connecting cylinder 10 in the corresponding motor connecting mechanism is started to pull the first upper tooth connecting ring 9 upwards to disconnect the connection between the first upper tooth connecting ring 9 and the first driving sprocket 11, and then the two connecting cylinders 10 in the motor connecting mechanism located at the bottom are started to connect the only driving motor 5 at the bottom to the first driving sprocket 11. Through the above technical solution, when the driving motor 5 in use fails in the sampling area and cannot perform sampling operations, another driving motor 5 can be used as the total power source, thereby improving the flexibility of the equipment; Through the two motor connection mechanisms, when one of the drive motors 5 is turned on, the other drive motor 5 can be disconnected from the first drive sprocket 11. This structure can prevent the idle drive motor 5 from being worn out because the square drive shaft 6 connected to it is driven to rotate by the first drive sprocket 11, thereby increasing its service life.

[0022] A full-automatic layered sampling mechanism 2 is provided on one side of the dual-power drive mechanism. The full-automatic layered sampling mechanism 2 includes a sampling drill rod 201, a plurality of sampling sleeves 215, a storage slot 220 having the same number as the sampling sleeves 215, and a synchronous drive mechanism. The plurality of storage slots 220 are respectively located at the front and rear end surfaces of the sampling drill rod 201, and the plurality of sampling sleeves 215 are respectively located inside the plurality of storage slots 220. The synchronous drive mechanism can synchronously drive all the sampling sleeves 215 to move outward or inward while rotating. The full-automatic layered sampling mechanism 2 also includes A drill bit 217, which is fixed to the lower end surface of the sampling drill rod 201; when the driving shaft 16 starts to rotate, the fully automatic stratified sampling mechanism 2 fixed to the lower end surface of the driving shaft 16 will rotate therewith. When the fully automatic stratified sampling mechanism 2 starts to rotate, the fully automatic stratified sampling mechanism 2 is moved downward by the soil sampler bracket 1, and the drill bit 217 can make the fully automatic stratified sampling mechanism 2 gradually penetrate into the interior of the grassland. When the fully automatic stratified sampling mechanism 2 completely enters the interior of the grassland, the driving motor 5 serving as the driving source is turned off.

[0023] A sealing sleeve 202 movably sleeved on the outer surface of the sampling drill rod 201 is provided above the drill bit 217, and a plurality of sampling through holes 203 are provided on the front and rear end surfaces of the sealing sleeve 202, and the number of the sampling through holes 203 is the same as the storage groove 220, and the positions of the sampling through holes 203 correspond to the positions of the storage groove 220; a pushing cylinder 204 is fixedly installed on both sides of the inner top end of the sampling drill rod 201, and the piston rod of the pushing cylinder 204 is fixed to the inner wall of the sealing sleeve 202; when the driving motor 5 serving as the driving source is turned off, the sealing sleeve 202 connected thereto is pushed upward by the pushing cylinder 204 until the sampling through holes 203 located on the outer surface of the sealing sleeve 202 are moved to a position parallel to the storage groove 220; The sealing sleeve 202 can prevent soil from entering the receiving groove 220 located on the outer surface of the sampling drill rod 201 when the fully automatic layered sampling mechanism 2 penetrates into the grassland.

[0024] The synchronous driving mechanism includes a stepper motor 205, the output shaft of the stepper motor 205 is connected to a transmission shaft 206 through a coupling, and a plurality of first bevel gears 207 are fixedly sleeved on the outer surface of the transmission shaft 206, and the number of the first bevel gears 207 is half of the storage slots 220; when the fully automatic stratified sampling mechanism 2 completely enters the interior of the lawn, the stepper motor 205 is started, and the stepper motor 205 can drive the transmission shaft 206 connected thereto and the plurality of first bevel gears 207 fixedly sleeved on the outer surface of the transmission shaft 206 to rotate.

[0025] A second bevel gear 208 is meshed on both sides of the outer surface of the first bevel gear 207, and the axis of the second bevel gear 208 is connected to a gear transmission shaft 209, and one end of the gear transmission shaft 209 is fixedly connected to a square shaft 210, and the outer side of the top end of the square shaft 210 is provided with an internal thread transmission groove 219 located inside the sampling drill rod 201, and the inside of the internal thread transmission groove 219 is provided with a threaded transmission rod 211 matching its internal thread, and the surface of the threaded transmission rod 211 facing the gear transmission shaft 209 is provided with a square slot 212, and the square shaft 210 is inserted into the inside of the square slot 212, and the inner wall cross-section of the square slot 212 is square, and the outer surface of the square shaft 210 is in contact with the inner wall of the square slot 212, and The square shaft 210 is slidably connected to the square slot 212; the rotating first bevel gear 207 can drive the second bevel gear 208 meshing therewith and the gear transmission shaft 209 connected to the axis of the second bevel gear 208 to rotate. When the gear transmission shaft 209 rotates, the square shaft 210 fixed thereto will rotate together. Since the outer surface of the square shaft 210 fits the inner wall of the square slot 212 located on the outer surface of the threaded transmission rod 211, when the square shaft 210 rotates, the threaded transmission rod 211 will rotate therewith. Driven by the internal thread structure of the internal thread transmission groove 219, the rotating threaded transmission rod 211 can move outward or inward while rotating, and at this time all the threaded transmission rods 211 are moved outward synchronously.

[0026] A mounting plate 213 is fixedly arranged on the surface of the threaded transmission rod 211 facing the nearest sampling sleeve 215, and an external threaded connector 214 is fixedly arranged on the surface of the mounting plate 213 facing the nearest sampling sleeve 215. An internal threaded connector groove 216 located on the outer surface of the sampling sleeve 215 is arranged on the outer side of the external threaded connector 214, and the external thread of the external threaded connector 214 matches the internal thread of the internal threaded connector groove 216. As the threaded transmission rod 211 moves, the mounting plate 213 fixed thereto and the mounting plate 213 fixed thereto move toward the sampling sleeve 215. The sampling sleeve 215 threadedly connected between the mounting plate 213 through the external thread connector 214 and the inclined surface 218 will rotate and move outwards together, and the sampling sleeve 215 rotating and moving outwards will gradually enter the inside of the lawn, and in the process of the sampling sleeve 215 entering the inside of the lawn, its soil sample will enter the inside of the sampling sleeve 215. When the sampling sleeve 215 can no longer be moved outwards, the driving shaft 206 connected thereto is driven by the stepping motor 205 to reverse The sampling sleeve 215 is rotated inwardly to synchronously move all the sampling sleeves 215 inwardly. As the sampling sleeve 215 moves, the soil sample inside it will enter the interior of the sampling drill rod 201. When all the sampling sleeves 215 are collected, the sealing sleeve 202 is moved downward by the pushing cylinder 204 to seal the storage groove 220. After the storage groove 220 is sealed, the fully automatic stratified sampling mechanism 2 is moved upwardly by the soil sampler bracket 1. When the fully automatic stratified sampling mechanism 2 is completely moved to the outside, the connection between the fully automatic stratified sampling mechanism 2 and the driving shaft 16 is released, and then the fully automatic stratified sampling mechanism 2 is taken into the laboratory as a whole. The storage groove 220 is opened and all the sampling sleeves 215 are synchronously moved outwardly through the above scheme, so that the soil at different depths collected is arranged one by one according to its depth in the outside world. The above technical scheme increases the convenience of the equipment, so that the entire cylindrical sample does not need to be segmented during the sampling process. The entrance of the sampling sleeve 215 is an inclined surface 218; the sampling sleeve 215 can enter the inside of the lawn more easily by virtue of the entrance being the inclined surface 218; When sampling operations are required for different grasslands, the sampling sleeve 215 can be rotated to be removed from the external thread connector 214 and cleaned to prevent the remaining soil in the sampling sleeve 215 from mixing with other types of soil.

[0027] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A soil sampling device for grassland soil nitrogen transformation research, comprising a soil sampling machine bracket (1), characterized in that: A dual-power drive mechanism is fixedly mounted on one side of the rear end face of the soil sampler bracket (1), the dual-power drive mechanism comprising two drive motors (5), two square drive shafts (6), two circular plates (7), two square through holes (8), two first upper tooth connection rings (9), a first drive sprocket (11), two annular grooves (12), two second upper tooth connection rings (13) and two motor connection mechanisms, the two annular grooves (12) being respectively located at the middle positions of the upper and lower end faces of the first drive sprocket (11), and the two second upper tooth connection rings (13) being respectively fixed inside the two annular grooves (12); The two driving motors (5) are respectively located above and below the first driving sprocket (11); the two square driving shafts (6) are respectively connected to the two driving motors (5); the two square through holes (8) are respectively located on the outer surfaces of the two circular plates (7); the circular plates (7) are movably sleeved on the outer surfaces of the square driving shafts (6) through the square through holes (8); and the two first upper tooth connecting rings (9) are respectively fixed to the surfaces of the two circular plates (7) facing the first driving sprocket (11); the top ends of the tooth heads of the second upper tooth connecting ring (13) and the first upper tooth connecting ring (9) are both arc-shaped; and the motor connecting mechanism is capable of pushing the first upper tooth connecting ring (9) in the direction of the second upper tooth connecting ring (13); A full-automatic stratified sampling mechanism (2) is provided on one side of the dual-power drive mechanism, the full-automatic stratified sampling mechanism (2) comprising a sampling drill rod (201), a plurality of sampling sleeves (215), storage slots (220) the same number as the sampling sleeves (215), and a synchronous drive mechanism, the plurality of storage slots (220) being respectively located at the front and rear end surfaces of the sampling drill rod (201), the plurality of sampling sleeves (215) being respectively located inside the plurality of storage slots (220), and the synchronous drive mechanism being capable of synchronously driving all the sampling sleeves (215) to rotate while moving outward or inward.

2. The soil sampling device for grassland soil nitrogen transformation research according to claim 1 is characterized in that: The dual-power drive mechanism further comprises two connecting and fixing plates (4), the upper end surfaces of the two connecting and fixing plates (4) being fixedly connected to a drive motor mounting plate (3), the lower end surfaces of the two connecting and fixing plates (4) being also fixedly connected to a drive motor mounting plate (3), and the surfaces of the connecting and fixing plates (4) facing the first drive sprocket (11) being connected to the first drive sprocket (11) via roller bearings; A driving shaft (16) is provided on one side of the first driving sprocket (11), a second driving sprocket (15) is provided on an upper fixed sleeve on the outer surface of the driving shaft (16), and the second driving sprocket (15) is connected in series with the first driving sprocket (11) via a driving chain (14).

3. The soil sampling device for grassland soil nitrogen transformation research according to claim 1, characterized in that: The motor connection mechanism comprises two connection cylinders (10), and a roller bearing connection plate (17) connected to the circular plate (7) via a roller bearing is fixedly connected to the piston rods of the two connection cylinders (10).

4. The soil sampling device for grassland soil nitrogen transformation research according to claim 1, characterized in that: The inner wall cross-section of the square through hole (8) is in the shape of a square, the outer surface of the square driving shaft (6) fits the inner wall of the square through hole (8), and the square driving shaft (6) and the square through hole (8) are slidably connected.

5. The soil sampling device for grassland soil nitrogen transformation research according to claim 1, characterized in that: The fully automatic layered sampling mechanism (2) further comprises a drill bit (217), wherein the drill bit (217) is fixed to the lower end surface of the sampling drill rod (201).

6. The soil sampling device for grassland soil nitrogen transformation research according to claim 5, characterized in that: A sealing sleeve (202) is provided above the drill bit (217) and is movably sleeved on the outer surface of the sampling drill rod (201). The front and rear end surfaces of the sealing sleeve (202) are both provided with a plurality of sampling through holes (203). The number of the sampling through holes (203) is the same as that of the receiving grooves (220), and the positions of the sampling through holes (203) correspond to the positions of the receiving grooves (220).

7. The soil sampling device for grassland soil nitrogen transformation research according to claim 6, characterized in that: A pushing cylinder (204) is fixedly mounted on both sides of the interior of the top end of the sampling drill rod (201), and the piston rod of the pushing cylinder (204) is fixed to the inner wall of the sealing sleeve (202).

8. The soil sampling device for grassland soil nitrogen transformation research according to claim 1, characterized in that: The synchronous drive mechanism comprises a stepper motor (205), the output shaft of the stepper motor (205) being connected to a transmission shaft (206) via a coupling, a plurality of first bevel gears (207) being fixedly sleeved on the outer surface of the transmission shaft (206), and the number of the first bevel gears (207) being one-half of the number of the storage slots (220).

9. The soil sampling device for grassland soil nitrogen transformation research according to claim 8, characterized in that: A second bevel gear (208) is meshed on both sides of the outer surface of the first bevel gear (207); the axis of the second bevel gear (208) is connected to a gear transmission shaft (209); one end of the gear transmission shaft (209) is fixedly connected to a square shaft (210); an inner thread transmission groove (219) located inside the sampling drill rod (201) is provided on the outer side of the top end of the square shaft (210); a thread transmission rod (211) matching the inner thread of the inner thread transmission groove (219) is provided inside; a square slot (212) is provided on the surface of the thread transmission rod (211) facing the gear transmission shaft (209); the square shaft (210) is inserted into the square slot (212); the inner wall cross-section of the square slot (212) is square; the outer surface of the square shaft (210) is in contact with the inner wall of the square slot (212); and the square shaft (210) and the square slot (212) are slidably connected.

10. The soil sampling device for grassland soil nitrogen transformation research according to claim 9, characterized in that: A mounting plate (213) is fixedly provided on the surface of the threaded transmission rod (211) facing the nearest sampling sleeve (215), an external threaded connector (214) is fixedly provided on the surface of the mounting plate (213) facing the nearest sampling sleeve (215), an internal threaded connector groove (216) located on the outer surface of the sampling sleeve (215) is provided on the outer side of the external threaded connector (214), and the external thread of the external threaded connector (214) matches the internal thread of the internal threaded connector groove (216); The inlet of the sampling sleeve (215) is an inclined surface (218).

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