Cultivated land soil sampling device

Abstract

The utility model relates to the technical field of soil sampling, and discloses a cultivated land soil sampling device, which comprises a cart, a sampling pipe, a rotary driving module, a rotary driving module, a rotary driving module, a rotary driving module, a rotary driving module and a rotary driving module, and the top of the cart is provided with a support frame; the tunneling module is arranged behind the cart through a rotary driving module, the tunneling module comprises a positioning sleeve shell, a pair of downward pressing handles are symmetrically arranged on the outer side of the positioning sleeve shell, a tubular tunneling drill bit is rotationally arranged on the inner side of the positioning sleeve shell, a soil sampling module is arranged at the top of the tunneling drill bit, and the soil sampling module comprises a sleeve rotationally arranged in the tunneling drill bit; a soil cutting structure is arranged on one side of the casing pipe, the sampling pipe is arranged in the casing pipe, and after the tunneling drill drills into the soil, the soil at the bottom of the sampling pipe is cut off through the soil cutting structure, and compared with the prior art, the soil sampling device has the advantages that the soil is directly sampled into the sampling pipe and is convenient to transfer, collect and store; the sampling soil integrity is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to soil sampling technical field, specifically point to cultivated soil sampling device. BACKGROUND

[0002] With the development of science and technology, the importance of scientific cultivation is significantly improved, through scientific analysis of soil properties, can provide data support for agricultural production, ecological protection and policy making, through cultivated soil sampling can accurately monitor soil nutrients (such as nitrogen, phosphorus, potassium) and pH value change, provide data basis for soil testing formula fertilization, realize the reduction of chemical fertilizer and efficiency, and in order to improve the reliability and universality of cultivated soil sampling, cultivated soil sampling needs to follow the principle of "random, equal, multi-point mixing".

[0003] Traditional cultivated soil sampling, generally utilizes ring cutter sampler to insert into soil, then pulls out, and the soil sample is taken out through the friction between the inner wall of ring cutter sampler and soil, so that the sampling soil is observed and detected, but the soil sample is retained in the ring cutter sampler, which is not convenient for transfer, collection and storage, when sampling multiple points, it is very troublesome and laborious, which reduces the soil sampling efficiency, and the soil sample is pulled off and taken out mainly through friction in the sampling process, the breaking point of the soil sample cannot be controlled, the integrity of the sampling soil cannot be guaranteed, the soil sample often scatters or deforms in the sampler, which causes certain influence on the original structure of the soil, and reduces the integrity, accuracy and reliability of the sampling result. SUMMARY

[0004] The technical problem to be solved by the utility model is to overcome the above technical difficulties, and a cultivated soil sampling device is provided, which can directly collect and sample cultivated soil into a sampling pipe, facilitate transfer, collection and storage, and can cut the bottom of the sampling soil to ensure the integrity of the sampling soil.

[0005] To solve the above technical problems, the technical scheme provided by the utility model is:

[0006] A cultivated soil sampling device, comprising a cart and a sampling pipe, the top of the cart is provided with a support frame, and the device further comprises:

[0007] A rotary drive module is arranged on the support frame;

[0008] A tunneling module is arranged at the rear of the cart through the rotary drive module, the tunneling module comprises a positioning sleeve, a pair of downward handles are symmetrically arranged on the outer side of the positioning sleeve, and a tubular tunneling drill is rotatably arranged on the inner side of the positioning sleeve, a soil sampling module is arranged on the top of the tunneling drill, the soil sampling module comprises a sleeve arranged in the tunneling drill, a soil cutting structure is arranged on one side of the sleeve, and the sampling pipe is arranged in the sleeve, after the tunneling drill tunnels into the soil, the bottom soil of the sampling pipe is cut off through the soil cutting structure;

[0009] The soil sample storage module is mounted on a trolley.

[0010] As an improvement, the rotary drive module includes a transmission structure, which includes a transmission box mounted on a support frame. A drive bevel gear is rotatably mounted inside the transmission box and is connected to the drive shaft of a drive motor mounted on the front side of the transmission box. A telescopic rod is rotatably mounted at the bottom of the transmission box. One end of the telescopic rod is provided with a driven bevel gear that meshes with the drive bevel gear, and the other end is provided with a drive gear and is rotatably mounted inside a positioning sleeve. A driven gear that meshes with the drive gear is rotatably mounted inside the positioning sleeve and is sleeved and fixed to the tunneling drill bit.

[0011] As an improvement, a telescopic tube is provided at the bottom of the transmission box corresponding to the telescopic rod. The cross-section of the telescopic tube is non-circular and the other end is connected to the positioning sleeve. A tension spring is provided between the transmission box and the positioning sleeve, and the tension spring is located inside the telescopic tube, which lifts the tunneling module when the trolley moves.

[0012] As an improvement, the soil cutting structure includes a drive shaft rotatably disposed within the side wall of the casing, a blade groove provided at the bottom of the inner wall of the casing, and an arc-shaped cutter with one end connected to the drive shaft disposed within the blade groove, a positioning tube slidably disposed within the side wall of the casing, and a spirally arranged guide groove disposed within the positioning tube, the top of the drive shaft being movably sleeved within the positioning tube, and a guide pin provided at the top that slides with the guide groove, when the positioning tube is pressed down, the drive shaft drives the arc-shaped cutter to rotate, thereby cutting the soil.

[0013] As an improvement, a positioning pressure plate connected to the positioning tube is provided on the outer side of the sleeve, and a ratchet is provided on the outer wall of the sleeve corresponding to the positioning tube. A ratchet block is slidably provided on the positioning pressure plate, and the ratchet block is a shell with one side wall set between the positioning pressure plate and the ratchet. After a compression spring is provided between its side wall and the positioning pressure plate, it meshes with the ratchet to prevent the ratchet block from moving upward under force, so that the arc-shaped cutter rotates and retracts into the cutter groove.

[0014] The advantages of this utility model compared with the prior art are as follows:

[0015] 1. This utility model is equipped with a sampling tube, which is arranged inside the sleeve. It can directly sample farmland soil into the sampling tube for storage, which is convenient for observation, transfer and storage. When sampling soil from multiple points in farmland, it can prevent cross-contamination between different soil samples, making it more convenient to use and the soil sampling results are more standardized and reliable.

[0016] 2. This utility model is equipped with a soil cutting structure, which can cut the soil at the bottom of the sampling tube after the drilling bit has entered the soil, so as to separate the sampling soil from the cultivated land, prevent the sampling soil from becoming loose, broken or deformed during the dragging process, make the sampling results more reliable and complete, and make the soil sampling process more convenient.

[0017] 3. This utility model is equipped with a tunneling module, and the tunneling drill bit of the tunneling module can be rotated by rotating the module, which makes it convenient to drill into soil with a certain hardness for sampling. It is more convenient and labor-saving to use, and improves the speed and efficiency of soil sampling in cultivated land. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 This is a schematic diagram showing the unfolded structure of this utility model.

[0020] Figure 3 This is a structural schematic diagram of the tunneling module of this utility model.

[0021] Figure 4 This is a cross-sectional schematic diagram of the tunneling module of this utility model.

[0022] Figure 5 This is a cross-sectional schematic diagram of the soil sample storage module of this utility model.

[0023] Figure 6 This is a schematic diagram of the structure of the rotary drive module of this utility model.

[0024] Figure 7 This is a schematic diagram showing the unfolded structure of the rotary drive module of this utility model.

[0025] Figure 8 This is a schematic diagram of the installation structure of this utility model.

[0026] Figure 9 This is a utility model Figure 6 Enlarged cross-sectional view of section A.

[0027] Figure 10 This is a utility model Figure 7 Enlarged cross-sectional view of section B.

[0028] As shown in the figure: 1. Trolley; 11. Base; 12. Wheel; 13. Push rod; 14. Support frame; 2. Tunneling module; 21. Tunneling drill bit; 211. Cutting teeth; 22. Positioning sleeve; 23. Press-down handle; 24. Abutment block; 25. Foot pedal; 3. Rotary drive module; 31. Transmission structure; 311. Transmission box; 312. Driving bevel gear; 313. Driven bevel gear; 314. Driving gear; 315. Driven gear; 316. Telescopic rod; 32. Telescopic tube; 321. Tension spring; 33. Drive motor; 34. Battery; 35. Control panel; 4. Soil sampling module; 41. Sleeve; 411. Cutting groove; 42. 421. Soil cutting structure; 422. Arc-shaped cutter; 423. Drive shaft; 424. Guide pin; 425. Positioning tube; 426. Positioning pressure plate; 427. Ratchet block; 428. Ratchet rack; 429. Compression spring; 43. Guide groove; 440. Coupling anti-rotation structure; 431. Coupling positioning box; 432. Adsorption block one; 433. Adsorption block two; 440. Installation positioning structure; 441. Top cover; 442. Upper slot; 443. Lower slot; 444. Sliding block; 5. Soil sample storage module; 51. Storage box; 52. Box cover; 53. Base support; 54. Limiting groove plate; 55. Adsorption block three; 56. Adsorption block four; 6. Sampling tube. Detailed Implementation

[0029] In the description of this utility model, it should be understood that the terms "center," "lateral," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion.

[0030] The present invention will now be described in further detail with reference to the accompanying drawings.

[0031] Combined with appendix Figure 1 Appendix Figure 2As shown, a farmland soil sampling device includes a trolley 1. The trolley 1 includes a U-shaped base 11 with its opening facing rearward. Wheels 12 and push rods 13 are respectively arranged on both sides of the base 11. The push rods 13 are arranged at an angle, with one end fixed to the base 11 and the other end arranged behind the trolley 1. A support frame 14 is arranged on the top of the base 11. A rotary drive module 3 is arranged on the support frame 14. A tunneling module 2 is arranged at the bottom of the rotary drive module 3. A soil sampling module 4 is arranged on the top of the tunneling module 2. Sampling tubes 6 are installed in the soil sampling module 4. Soil sample storage modules 5 for storing multiple sampling tubes 6 are arranged on the base 11 on both sides of the support frame 14.

[0032] In the above-described process, the cart 1 is pushed to the sampling point on the cultivated land, a sampling tube 6 is taken out from the soil sample storage module 5, and the sampling tube 6 is installed in the soil sampling module 4. After the rotating drive module 3 drives the tunneling module 2 to rotate, the tunneling module 2 is pressed down, causing the rotating tunneling module 2 to penetrate into the cultivated land soil. During the process, the soil sampling module 4 moves down with the tunneling module 2, so that the sampled soil enters the corresponding sampling tube 6. After sampling is completed, the sampling tube 6 is removed and put back into the soil sample storage module 5.

[0033] Combined with appendix Figure 1 Appendix Figure 3 Appendix Figure 4 As shown, the tunneling module 2 includes a positioning sleeve 22. A pair of pressing handles 23 are symmetrically arranged on the outer side of the positioning sleeve 22, and a tubular tunneling drill bit 21 is rotatably arranged on the inner side. Multiple cutting teeth 211 are evenly arranged around the bottom of the tunneling drill bit 21 to facilitate penetration and cutting of the soil. A stop block 24 is fixedly arranged on the rear side of the positioning sleeve 22, and a foot pedal 25 is hinged to the rear side of the stop block 24. After the foot pedal 25 is flipped downward to a horizontal state, its end abuts against the stop block 24 to form a limit, preventing it from continuing to flip downward.

[0034] As described above, the tunneling drill bit 21 rotates after being driven by the rotary drive module 3, and uses the cutting teeth 211 to penetrate and cut the soil. Pressing down the two side handles 23 makes the tunneling drill bit 21 gradually tunnel into the cultivated soil. When the cultivated soil is hard, the foot pedal 25 can be flipped down and stepped on to make it easier for the tunneling drill bit 21 to tunnel into the cultivated soil.

[0035] Combined with appendix Figure 1 Appendix Figure 3 Appendix Figure 4As shown, the rotary drive module 3 includes a transmission structure 31, which includes a transmission box 311 mounted on a support frame 14. A drive bevel gear 312 is rotatably mounted inside the transmission box 311, and the drive bevel gear 312 is connected to the drive shaft of a drive motor 33 mounted on the front side of the transmission box 311. A telescopic rod 316 is rotatably mounted at the bottom of the transmission box 311. One end of the telescopic rod 316 has a driven bevel gear 313 meshing with the drive bevel gear 312, and the other end has a drive gear 314 rotatably mounted inside a positioning sleeve 22. A drive bevel gear 314 meshing with the drive bevel gear 312 is rotatably mounted inside the positioning sleeve 22. The driven gear 315 meshes with the gear 314 and is sleeved and fixed on the drilling bit 21. The bottom of the transmission box 311 is provided with a telescopic tube 32 corresponding to the telescopic rod 316. The cross-section of the telescopic tube 32 is non-circular (in this embodiment, the cross-section of the telescopic tube 32 is elliptical to prevent the positioning sleeve 22 from rotating with the telescopic rod 316) and the other end is connected to the positioning sleeve 22. A tension spring 321 is provided between the transmission box 311 and the positioning sleeve 22 and is located inside the telescopic tube 32. A control panel 35 is provided on the rear side of the transmission box 311 and a battery 34 is provided on the bottom.

[0036] As described above, the drive motor 33 is started via the control panel 35. Under the transmission of bevel gears, the telescopic rod 316 rotates, and the driven gear 315 and the tunneling drill bit 21 rotate via the drive gear 314, which facilitates the tunneling drill bit 21 to break through the cultivated soil. The two side handles 23 are pressed down, which causes the telescopic tube 32 and the telescopic rod 316 to extend. The tunneling drill bit 21 moves down and tunnels into the cultivated soil to take samples. When the sampling is completed or the sample is transferred, the telescopic tube 32 retracts through the tension spring 321 and lifts the tunneling module 2.

[0037] Combined with appendix Figure 3 Appendix Figure 6 As shown, the soil sampling module 4 includes a sleeve 41 rotatably installed inside the tunneling drill bit 21. A soil cutting structure 42 is provided on one side of the sleeve 41, and an installation positioning structure 44 is provided on the top. A coupling anti-rotation structure 43 is provided between the sleeve 41 and the telescopic tube 32. After the sampling tube 6 is inserted into the sleeve 41 with its opening facing downward, it is limited in the sleeve 41 by the installation positioning structure 44. During the rotation of the tunneling drill bit 21, the sleeve 41 is prevented from rotating by the coupling anti-rotation structure 43. After the tunneling drill bit 21 has completely tunneled into the cultivated soil, the soil at the opening of the sampling tube 6 is horizontally cut by the soil cutting structure 42, so that the soil sampled in the sampling tube 6 can be completely removed.

[0038] Combined with appendix Figure 6 Appendix Figure 7 Appendix Figure 9 Appendix Figure 10As shown, the soil cutting structure 42 includes a drive shaft 422 rotatably disposed within the side wall of a sleeve 41. A cutter groove 411 is provided at the bottom of the inner wall of the sleeve 41, and an arc-shaped cutter 421, one end of which is connected to the drive shaft 422, is disposed within the cutter groove 411. A positioning tube 424 is slidably disposed vertically within the side wall of the sleeve 41, and a spirally arranged guide groove 429 (the spiral angle of the guide groove 429 is approximately 90°) is provided within the positioning tube 424. The top of the drive shaft 422 is movably sleeved within the positioning tube 424, and a guide pin 423 is provided at the top that slides in cooperation with the guide groove 429. When the positioning tube 424 is pressed down, the drive shaft 422... The movable arc-shaped cutter 421 rotates, and a positioning pressure plate 425 connected to the positioning tube 424 is provided on the outer side of the sleeve 41. A ratchet rack 427 is provided on the outer wall of the sleeve 41 corresponding to the positioning tube 424. A ratchet block 426 is slidably provided on the positioning pressure plate 425 (in order to facilitate the up and down sliding of the ratchet block 426, the ratchet block 426 is set as a shell, and the positioning pressure plate 425 is arranged inside the ratchet block 426). The ratchet block 426 is a shell with one side wall set between the positioning pressure plate 425 and the ratchet rack 427. After a compression spring 428 is provided between its side wall and the positioning pressure plate 425, it meshes with the ratchet rack 427.

[0039] Combined with appendix Figure 6 Appendix Figure 8 As shown, the installation positioning structure 44 includes a top cover 441, which is threaded to the top of the sleeve 41 and has a handle on the top. The top cover 441 has an upper slot 442 on its side wall, and the top of the sleeve 41 has a lower slot 443 corresponding to the upper slot 442 on its side wall. A sliding block 444 is slidably disposed in the upper slot 442, and the sliding block 444 and the lower slot 443 are inserted into each other.

[0040] Combined with appendix Figure 6 Appendix Figure 7 As shown, the coupling anti-rotation structure 43 includes a coupling positioning box 431 set on the side wall of the telescopic tube 32, and an adsorption block 432 is set on the coupling positioning box 431. A pair of adsorption blocks 433 are mirrored on the side wall of the sleeve 41. The two adsorption blocks 433 are arranged corresponding to the position of the adsorption block 432 and adsorb to each other with the adsorption block 432 respectively.

[0041] In the above description, after inserting the sampling tube 6 with its opening facing downwards into the casing 41, the top cover 441 is closed and rotated to align the upper slot 442 with the lower slot 443. Then, the sliding block 444 is pushed downwards, so that the sliding block 444 is partially inserted into the lower slot 443, preventing the sampling tube 6 from opening the top cover 441 while allowing the casing 41 to rotate with the top cover 441. After starting the drive motor 33, the drilling bit 21 begins to rotate, and one of the adsorption blocks 433 on the casing 41 is aligned with the adsorption block 1. The 432 components attract each other, keeping the casing 41 stationary while the drilling bit 21 rotates on the casing 41. Pressing down the handle 23 causes the drilling bit 21 to move downwards and penetrate into the farmland soil. Because the casing 41 remains stationary, the sampling tube 6 inside the casing 41 also remains stationary. There is only vertical friction between the sampling tube 6 and the farmland soil, resulting in minimal impact and damage to the soil structure and more accurate and reliable sampling results. After the drilling bit 21 has completely penetrated into the farmland soil, the drive motor 3 is stopped via the control panel 35. 3. Press down on the sliding ratchet block 426 to make the positioning tube 424 drive the drive shaft 422 to rotate. The drive shaft 422 drives the arc-shaped cutter 421 to rotate and leave the cutter groove 411. Manually rotate the top cover 441 to drive the sleeve 41 to rotate (during the process, the force on the second adsorption block 433 and the first adsorption block 432 exceeds the suction force between them, causing them to separate). The arc-shaped cutter 421 follows the rotation of the sleeve 41 to cut the soil at the opening of the sampling tube 6 horizontally, making it convenient to sample the soil inside the sampling tube 6. Remove the entire sample, pull up the two downward-pressing handles 23 to pull the drilling bit 21 out of the cultivated soil, and the sampling tube 6 is lifted by the friction of the side wall and the bottom arc-shaped cutter 421 to carry away the sampled soil. After sliding the sliding block 444 upward, unscrew the top cover 441 to take out the sampling tube 6 and store it in the soil sample storage module 5. After pulling the ratchet block 426 outward, the ratchet block 426 can be separated from the ratchet rack 427, thereby sliding the ratchet block 426 upward and causing the arc-shaped cutter 421 to retract into the cutter groove 411.

[0042] Combined with appendix Figure 1 Appendix Figure 5 As shown, the soil sample storage module 5 includes a pair of storage boxes 51, which are respectively set on the base 11 on the left and right sides of the support frame 14. The storage box 51 is provided with a limiting groove plate 54, and a bottom support 53 is provided at the bottom. The top is provided with a box cover 52. The limiting groove plate 54 is provided with multiple through grooves that are adapted to the sampling tube 6. The bottom support 53 is provided with a limiting groove corresponding to each through groove. After the sampling tube 6 is inserted with its opening facing upwards into the corresponding through groove and limiting groove, it is stably placed in the storage box 51. The box cover 52 is tilted from the inside to the outside to facilitate rain drainage and prevent sudden rain from contaminating and affecting the soil sampling results. The box cover 52 is provided with an adsorption block three 55 (the adsorption block three 55 is magnetic), and the transmission box 311 is provided with adsorption blocks four 56 on both sides corresponding to the adsorption blocks three 55. After the box cover 52 is flipped open, the adsorption blocks three 55 and adsorption blocks four 56 are attracted to each other.

[0043] In the specific implementation of this embodiment:

[0044] Push the trolley 1 to the sampling point on the farmland, take out a sampling tube 6 from the storage box 51, insert the sampling tube 6 with its opening facing down into the sleeve 41, and then limit it in the sleeve 41 by the installation positioning structure 44. Start the drive motor 33, and drive the tunneling module 2 to rotate through the rotation drive module 3. Press the tunneling module 2 to make the rotating tunneling drill bit 21 penetrate into the farmland soil. During the process, the soil sampling module 4 moves down with the tunneling module 2, so that the sampled soil enters the corresponding sampling tube 6. After the tunneling drill bit 21 has completely penetrated into the farmland soil, stop the drive motor 33 through the control panel 35, and press down the sliding ratchet block 426 to make the positioning tube 424 drive the drive shaft 422. The drive shaft 422 rotates, and the arc-shaped cutter 421 rotates and leaves the cutter groove 411. The top cover 441 is manually rotated to drive the sleeve 41 to rotate, and the arc-shaped cutter 421 follows the sleeve 41 to rotate, cutting the soil at the opening of the sampling tube 6 horizontally, so that the soil sampled in the sampling tube 6 can be completely removed. Pull up the two sides and press down the handles 23 to make the drilling bit 21 pull out the cultivated soil. The sampling tube 6 is lifted away by the friction of the side wall and the support of the bottom arc-shaped cutter 421. After sliding the sliding block 444, unscrew the top cover 441, take out the sampling tube 6, and store it in the storage box 51. After sampling, remove the sampling tube 6 and put it back into the soil sample storage module 5.

[0045] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A soil sampling device for cultivated land, comprising a trolley (1) and a sampling tube (6), wherein a support frame (14) is provided on the top of the trolley (1), characterized in that, Also includes: A rotary drive module (3) is mounted on a support frame (14); The tunneling module (2) is set behind the trolley (1) by a rotation drive module (3). The tunneling module (2) includes a positioning sleeve (22). A pair of pressing handles (23) are symmetrically arranged on the outside of the positioning sleeve (22). A tubular tunneling drill bit (21) is rotatably arranged on the inside. A soil sampling module (4) is set on the top of the tunneling drill bit (21). The soil sampling module (4) includes a sleeve (41) rotatably arranged inside the tunneling drill bit (21). A soil cutting structure (42) is set on one side of the sleeve (41). The sampling tube (6) is arranged inside the sleeve (41). After the tunneling drill bit (21) tunnels into the soil, the soil at the bottom of the sampling tube (6) is cut off by the soil cutting structure (42). The rotary drive module (3) includes a telescopic rod (316), one end of which is provided with a drive gear (314), and a driven gear (315) that meshes with the drive gear (314) is rotatably provided inside the positioning sleeve (22), and the driven gear (315) is sleeved and fixed on the tunneling drill bit (21). The soil cutting structure (42) includes a drive shaft (422) rotatably disposed in the side wall of the sleeve (41), a knife groove (411) is provided at the bottom of the inner wall of the sleeve (41), and an arc-shaped cutter (421) with one end connected to the drive shaft (422) is provided in the knife groove (411).

2. The soil sampling device for cultivated land according to claim 1, characterized in that: The rotary drive module (3) includes a transmission structure (31), which includes a transmission box (311) mounted on a support frame (14). A drive bevel gear (312) is rotatably mounted inside the transmission box (311), and the drive bevel gear (312) is connected to the drive shaft of a drive motor (33) mounted on the front side of the transmission box (311). The other end of the telescopic rod (316) is provided with a driven bevel gear (313) that meshes with the drive bevel gear (312).

3. The soil sampling device for cultivated land according to claim 2, characterized in that: The bottom of the transmission box (311) is provided with a telescopic tube (32) corresponding to the telescopic rod (316). The telescopic tube (32) has a non-circular cross section and the other end is connected to the positioning sleeve (22). A tension spring (321) is provided between the transmission box (311) and the positioning sleeve (22), and the tension spring (321) is located inside the telescopic tube (32).

4. The soil sampling device for cultivated land according to claim 1, characterized in that: The sleeve (41) has a positioning tube (424) that slides up and down inside the side wall, and a spirally arranged guide groove (429) is provided inside the positioning tube (424). The top of the drive shaft (422) is movably sleeved inside the positioning tube (424), and a guide pin (423) that slides with the guide groove (429) is provided at the top. After the positioning tube (424) is pressed down, the drive shaft (422) drives the arc-shaped cutter (421) to rotate.

5. A farmland soil sampling device according to claim 4, characterized in that: The outer side of the sleeve (41) is provided with a positioning pressure plate (425) connected to the positioning tube (424), and a ratchet (427) is provided on the outer wall of the sleeve (41) corresponding to the positioning tube (424). A ratchet block (426) is slidably provided on the positioning pressure plate (425), and the ratchet block (426) is a shell with one side wall provided between the positioning pressure plate (425) and the ratchet (427). After a compression spring (428) is provided between its side wall and the positioning pressure plate (425), it meshes with the ratchet (427).

6. A farmland soil sampling device according to claim 1, characterized in that: It also includes a soil sample storage module (5), which is set on a trolley (1).

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