Soil sampling device and measuring and positioning method thereof

Abstract

The invention relates to the technical field of soil sampling, and provides a soil sampling device and a measuring and positioning method thereof. The device comprises a bottom plate, a connecting side plate, a top plate, universal wheels with brakes, a sampling cylinder and the like. The bottom of the bottom plate is provided with an annular mounting cavity which is internally provided with a red laser lamp and used for ground projection of an annular light spot positioning sampling center. A first sliding groove and a second sliding groove are formed in the connecting side plate, a mounting cylinder slides in the first sliding groove, and a servo motor is arranged in the mounting cylinder to drive the sampling cylinder to rotate; a limiting assembly is arranged in the second sliding groove, and the sampling depth is fixed through the L-shaped sliding block and the clamping groove. An anti-falling assembly is arranged at the top of the sampling cylinder and comprises a rotating strip-shaped plate for blocking the air holes. The method comprises the following steps: positioning the mobile device, adjusting depth, rotating the sampling cylinder to collect a sample, sealing an air hole, lifting the sampling cylinder and removing soil on the outer wall through the dust removal cylinder. The device solves the problems that the traditional positioning deviation is large, the depth error is high, and the sample is easy to fall off, and improves the sampling precision and efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of soil sampling, and in particular to a soil sampling device and a measurement and positioning method thereof. Background Art

[0002] Soil sampling is a fundamental operation in geological exploration, environmental monitoring, and agricultural research. Traditional methods rely on manual visual inspection or simple markings to determine sampling points. This can easily lead to positioning deviations of more than 10 cm on slopes or in vegetation-covered areas, resulting in duplicate sampling points or inaccurate data. Depth control uses mechanical limits or manual readings, with an error range of 5%-8%, making it difficult to meet the accuracy requirements of stratified sampling. Vibration or changes in air pressure when the sampling tube is lifted can cause 15%-20% of the sample to fall out of the exhaust hole, and residual soil on the tube wall can cause cross-contamination. The equipment lacks a mobile auxiliary mechanism, and transportation requires the cooperation of 2-3 people; height adjustment relies on manual bolt locking, which takes more than 5 minutes per time and is inefficient. These problems affect the reliability of sampling data and the convenience of on-site operations. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem in the prior art that traditional devices rely on manual visual or simple marking to determine the sampling points, which is prone to positioning deviations of more than ±10 cm in complex terrain (such as slopes and vegetation-covered areas), resulting in repeated sampling or data distortion. The depth is controlled by mechanical limiting or manual reading, with an error range of 5%-8%, which is difficult to meet the accuracy requirements of stratified sampling (such as 0-20 cm tillage layer and 20-50 cm subsoil layer). During the lifting process of the sampling tube, due to vibration or air pressure changes, about 15%-20% of the samples are prone to fall off from the exhaust hole; residual soil adheres to the tube wall, causing cross-contamination of samples at different depths. The traditional device lacks a mobile auxiliary mechanism, and the equipment transfer requires the cooperation of 2-3 people; the height adjustment relies on manual bolt locking, and a single adjustment takes more than 5 minutes. A soil sampling device and its measurement and positioning method are proposed.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A soil sampling device comprising:

[0006] A base plate, wherein a ring-shaped mounting cavity is formed at the bottom of the base plate, and a plurality of red laser lamps are fixedly mounted inside the ring-shaped mounting cavity. The red laser lamps are used to form a ring-shaped light spot on the ground to locate the sampling center;

[0007] A top plate, fixedly connected to the top of the bottom plate;

[0008] Two connecting side panels, fixedly connected between the bottom panel and the top panel;

[0009] A mounting cylinder slidably disposed on the connecting side plate;

[0010] A sampling cylinder is rotatably installed inside the installation cylinder for collecting soil samples;

[0011] An adjusting assembly is arranged on the top of the top plate for adjusting the height of the installation cylinder;

[0012] A limiting assembly is slidingly connected to the connecting side plate for limiting the sampling depth;

[0013] A drop-preventing assembly is arranged on the top of the sampling cylinder for preventing the sample from falling off;

[0014] Wherein, the sampling cylinder is driven to rotate by a servo motor, and the adjusting assembly controls the descending speed of the sampling cylinder to realize soil sampling.

[0015] As a further improvement of the above technical solution:

[0016] The adjusting assembly comprises a lead screw, the lead screw is rotatably penetrated through the top plate and threaded through a rectangular slide block, the rectangular slide block is slidingly connected to a first sliding groove, the first sliding groove is opened on one side of the connecting side plate, and the top of the lead screw is fixedly connected with a hand wheel, and the bottom of the lead screw is rotatably connected with the bottom of the first sliding groove.

[0017] The limiting assembly comprises an L-shaped slide block, the L-shaped slide block is slidingly connected to a second sliding groove, the second sliding groove is opened on one side of the connecting side plate, the top of the L-shaped slide block is slidingly connected with two sliding strip plates, a second compression spring is arranged between the two sliding strip plates, the two ends of the second compression spring are abutted against one side of the two sliding strip plates through spring seats, a clamping rod is fixedly connected to the sides of the two sliding strip plates away from each other, a plurality of clamping grooves are opened on the inner walls of the two sides of the second sliding groove at equal intervals, and the clamping rod is clamped with the clamping grooves.

[0018] A U-shaped block is slidingly connected to the L-shaped slide block, a third compression spring is arranged between the bottom of the U-shaped block and the top of the L-shaped slide block, the two ends of the third compression spring are abutted against the bottom of the U-shaped block and the top of the L-shaped slide block through spring seats, triangular blocks are fixedly connected to the inner walls of the two sides of the U-shaped block, and the inclined surfaces of the triangular blocks are abutted against the sliding strip plates for pushing the sliding strip plates to move transversely.

[0019] Further comprising a dust removal cylinder, the outer wall of the dust removal cylinder is conically arranged and the inner diameter of the dust removal cylinder matches the outer diameter of the sampling cylinder, and the dust removal cylinder is fixedly connected to the sides of the two L-shaped slide blocks away from each other for scraping off the soil on the outer wall of the sampling cylinder, and the residual amount is less than 0.2g.

[0020] The anti-falling assembly comprises a fixing cylinder fixedly connected to the top of the sampling cylinder, a rotating strip-shaped plate rotatably sleeved on the outer wall of the fixing cylinder, two air exhaust holes formed in the top of the sampling cylinder, and the rotating strip-shaped plate used for plugging the air exhaust holes to achieve a sample retention rate of 98%.

[0021] The top of the fixing cylinder is fixedly connected to a limiting cover plate, the outer wall of the fixing cylinder is slidably sleeved with a sliding circular plate, a first compression spring is arranged between the bottom of the limiting cover plate and the top of the sliding circular plate, both ends of the first compression spring abut against the bottom of the limiting cover plate and the top of the sliding circular plate through spring seats, and the bottom of the sliding circular plate is fixedly connected to a rectangular limiting block used for limiting the rotating strip-shaped plate.

[0022] Both sides of the mounting cylinder are provided with notches, and both sides of the mounting cylinder are fixedly connected with side edge rectangular blocks used for abutting against the limiting assembly to terminate sampling, and the sampling depth deviation is less than 0.5%.

[0023] The servo motor has a dynamically adjustable output torque of 0-12 N·m, and the sampling cylinder is provided with helical blades and an attack angle of 15°.

[0024] A measurement positioning method is applied to the soil sampling device, and specifically comprises the following steps:

[0025] S1, moving the device to a sampling position and forming a light spot on the ground by a red laser light to position the sampling center;

[0026] S2, adjusting the limiting assembly to a target depth position;

[0027] S3, starting the servo motor to drive the sampling cylinder to rotate, and operating the adjusting assembly to lower the sampling cylinder to collect soil samples;

[0028] S4, before lifting the sampling cylinder, operating the anti-falling assembly to plug the air holes;

[0029] S5, lifting the sampling cylinder and scraping off the soil on the outer wall by the dust removal cylinder.

[0030] In use, the device is moved to a suitable position by a plurality of brake universal wheels, after the movement is completed, a plurality of red laser lights are started, and then a ring can be irradiated on the ground, which can help the user to quickly determine the current sampling position, after the determination is completed, the brake universal wheels are braked by the self-provided brake, and the sampling process is prepared to start.

[0031] The U-shaped block is pressed down to move the triangular block downwards, and the inclined surface of the triangular block squeezes the two sliding strips. The sliding strips squeeze the second compression spring and move closer to each other. The sliding strips drive the clamping rod to move laterally, and the clamping rod moves out of the inside of the clamping slot, thereby releasing the braking state of the L-shaped slider and adjusting the height of the L-shaped slider. The L-shaped slider drives the dust collector to move to a suitable height, and the U-shaped block is released so that the clamping rod is stuck in the inside of the clamping slot at different heights, thereby fixing the L-shaped slider at a suitable height.

[0032] Start the servo motor, the output shaft of the servo motor drives the rotating shaft to rotate, and the rotating shaft drives the sampling tube to rotate. Synchronously, the user can turn the handwheel, the handwheel drives the screw to rotate, the screw drives the rectangular slider to move downward, the rectangular slider drives the installation tube to move downward, and the installation tube drives the sampling tube to move downward as a whole, so that the sampling tube can be inserted into the soil for sampling;

[0033] When the mounting cylinder gradually moves downward, the side rectangular block conflicts with the top of the U-shaped block, and the hand wheel is no longer rotated at this time, and the servo motor is turned off to complete the soil sampling process at this depth. At this time, the sliding circular plate is pulled, and the sliding circular plate squeezes the first compression spring and drives the rectangular limit block to move upward. At this time, the rectangular limit block no longer limits the rotating strip plate, and the rotating strip plate can be rotated by ninety degrees. The sliding circular plate is released, and the rectangular limit block limits the rotating strip plate again, and the rotating strip plate blocks the pores to prevent the sample from falling off when the soil is taken out;

[0034] At this time, you can press the U-shaped block again, and then move the dust removal cylinder to the lowest point through the two L-shaped sliders, and rotate the handwheel in the opposite direction so that the sampling cylinder can move up to bring out the sample, and the outside of the sampling cylinder will collide with the dust removal cylinder. The dust removal cylinder can scrape off the residual soil on the outer wall of the sampling cylinder to ensure that the outer wall of the sampling cylinder remains clean.

[0035] Beneficial effects:

[0036] A clear light spot is projected on the ground through a ring-shaped red laser lamp, with a positioning error of ≤2cm. Combined with the universal wheel with brake, it can achieve "instant stop and fix", solving the positioning ambiguity problem of traditional devices, and is particularly suitable for grid sampling scenarios.

[0037] The mechanical limit structure of dual card slots and L-shaped sliders, combined with a screw drive, achieves 0.1mm depth adjustment accuracy. The physical limit design of the side rectangular block and U-shaped block ensures that the sampling end depth deviates from the preset value by less than 0.5%.

[0038] The linkage design of the rotating strip plate and the air hole can achieve the switch between exhaust and sealing state through 90° rotation, and the sample retention rate is increased to more than 98%; the conical dust collector automatically scrapes the soil on the barrel wall when descending, and the residual amount is <0.2g, avoiding cross contamination.

[0039] Hand wheel drive screw rod realizes single-handed lifting operation, height adjustment speed reaches 150mm / s, and efficiency is improved by 400% compared with the traditional bolt locking mode; the universal wheel bearing capacity reaches 300kg, and single person can complete equipment transfer.

[0040] The servo motor output torque is dynamically adjustable (0-12N·m), and the spiral blade angle of the sampling cylinder is optimized (attack angle 15°), so that the penetration in hard soil layer is improved by 60%, and the sticky soil escape ability is improved by 80%. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a three-dimensional structure schematic view of the soil sampling device;

[0042] Figure 2 It is a three-dimensional structure schematic view of the soil sampling device from a second perspective;

[0043] Figure 3 It is a three-dimensional structure schematic view of the soil sampling device connecting the side plate and the sampling cylinder;

[0044] Figure 4 It is an exploded view of the sampling cylinder and the rotating strip plate in the soil sampling device;

[0045] Figure 5 It is an exploded view of the sliding round plate and the rotating strip plate in the soil sampling device;

[0046] Figure 6 It is a three-dimensional structure schematic view of the dust removal cylinder and the L-shaped sliding block in the soil sampling device;

[0047] Figure 7 It is a structure schematic view of the L-shaped sliding block and the sliding strip plate in the soil sampling device.

[0048] In the figure: 1, bottom plate; 2, universal wheel with brake; 3, material taking port; 4, dust removal cylinder; 5, hand wheel; 6, mounting cylinder; 7, top plate; 8, connecting side plate; 9, sampling cylinder; 10, red light laser lamp; 11, annular mounting cavity; 12, lead screw; 13, first sliding groove; 14, clamping groove; 15, second sliding groove; 16, notch; 17, side edge rectangular block; 18, rotating shaft; 19, rectangular sliding block; 20, servo motor; 21, air hole; 22, limiting cover plate; 23, rotating strip plate; 24, first compression spring; 25, sliding round plate; 26, fixed cylinder; 27, rectangular limiting block; 28, sliding strip plate; 29, triangular block; 30, U-shaped block; 31, clamping rod; 32, second compression spring; 33, third compression spring; 34, L-shaped sliding block. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application.

[0050] Embodiment 1; Refer to Figures 1-7 A sampling device, the device body includes a bottom plate 1, the top of the bottom plate 1 is fixedly connected with two symmetrically arranged connecting side plates 8, and the top of the connecting side plates 8 is fixedly connected with a top plate 7. Brake universal wheels 2 are installed at the bottom of the bottom plate 1 at four corners, the brake universal wheels 2 can adopt a double-row roller type, a single-wheel braking type or a hydraulic lifting type structure to adapt to complex terrains such as mud land and slope land, and a circular material taking port 3 is formed in the center of the bottom plate 1. A vertical first sliding groove 13 is formed in the side surface of the connecting side plate 8, a rectangular sliding block 19 is slidingly connected in the first sliding groove 13, and a mounting cylinder 6 is fixedly installed between the two rectangular sliding blocks 19. A sampling cylinder 9 is rotatably penetrated in the mounting cylinder 6, rectangular notches 16 are formed in the two sides of the mounting cylinder 6, a servo motor 20 is fixed to the inner wall of the top of the mounting cylinder 6, a rotating shaft 18 is connected to the output shaft of the servo motor 20, and the bottom of the rotating shaft 18 is fixedly connected with the top of the sampling cylinder 9. An adjusting assembly is arranged on the top of the top plate 7: a lead screw 12 is rotatably penetrated through the top plate 7, the bottom of the lead screw 12 is threadedly penetrated through the right rectangular sliding block 19 and is rotatably connected with the bottom of the first sliding groove 13, and a hand wheel 5 is fixed to the top of the lead screw 12. The cutting edge at the bottom of the sampling cylinder 9 can be configured as a spiral tooth, a sawtooth flat blade or an inclined angle ladder shape to improve the penetration of the hard soil layer.

[0051] A second sliding groove 15 is formed in the side surface of the connecting side plate 8, and a limiting assembly is slidingly connected in the second sliding groove 15: an L-shaped sliding block 34 slides in the second sliding groove 15, two symmetrically arranged sliding strip plates 28 are slidingly connected to the top of the L-shaped sliding block 34, a second compression spring 32 is arranged between the two sliding strip plates 28, and a clamping rod 31 is fixed to the outer side of the second compression spring 32. Clamping grooves 14 are formed in the inner walls of the two sides of the second sliding groove 15, and the clamping rod 31 is clamped with the clamping grooves 14. U-shaped blocks 30 are slidingly sleeved on the two sides of the L-shaped sliding block 34, and a third compression spring 33 is arranged between the bottom of the U-shaped block 30 and the top of the L-shaped sliding block 34. A triangular block 29 is fixed to the inner wall of the U-shaped block 30, and the inclined surface of the triangular block 29 is in abutment with the sliding strip plate 28. A conical dust removal cylinder 4 is fixed between the two L-shaped sliding blocks 34, and the inner diameter of the dust removal cylinder 4 matches the outer diameter of the sampling cylinder 9.

[0052] The embodiment 2 is a soil sampling device and its measuring positioning method, which is applied in the field of soil sampling. A falling prevention assembly is arranged at the top of the sampling cylinder 9. The fixed cylinder 26 is fixed at the top of the sampling cylinder 9, and the outer wall of the fixed cylinder 26 is rotationally sleeved with the rotating strip-shaped plate 23. Two air holes 21 are symmetrically arranged at the top of the sampling cylinder 9. The top of the fixed cylinder 26 is fixed with the limiting cover plate 22, the outer wall of the fixed cylinder 26 is slidably sleeved with the sliding circular plate 25, and the first compression spring 24 is arranged between the limiting cover plate 22 and the sliding circular plate 25. The bottom of the sliding circular plate 25 is fixed with four rectangular limiting blocks 27, and the rectangular limiting blocks 27 are limitedly matched with the edges of the rotating strip-shaped plate 23. The bottom plate 1 is provided with an annular mounting cavity 11 at the bottom, and a plurality of red light laser lamps 10 are annularly arranged in the mounting cavity 11.

[0053] A measuring positioning method comprises the following implementation steps:

[0054] Step one, push the device to move the universal wheel with brake 2 to the sampling area, step on the brake to brake. Start the red light laser lamp 10 to form a ring-shaped light spot mark with a diameter of 50 cm on the ground to mark the sampling center, and use a laser range finder to calibrate the positioning error to within 2 cm.

[0055] Step two, press the two U-shaped blocks 30 at the same time, the U-shaped blocks 30 move downward to compress the third compression spring 33 and push the triangular block 29 to press the sliding strip-shaped plate 28 downward. The sliding strip-shaped plate 28 extrudes the second compression spring 32 to shrink inward, which drives the clamping rod 31 to disengage from the current clamping groove 14. After the upper and lower L-shaped sliding blocks 34 are slid to the position of the clamping groove 14 corresponding to the target depth, the U-shaped blocks 30 are released, the third compression spring 33 pushes the U-shaped blocks 30 to reset, the triangular block 29 releases the pressure on the sliding strip-shaped plate 28, the second compression spring 32 pushes the clamping rod 31 to be clamped into the clamping groove 14, and the height of the dust removal cylinder 4 is fixed.

[0056] Step three, start the servo motor 20 to drive the rotating shaft 18 to rotate the sampling cylinder 9 at a speed of 120 rpm. Synchronously rotate the hand wheel 5 clockwise to drive the screw rod 12 to rotate, so that the rectangular sliding block 19 descends along the first sliding groove 13 at a speed of 80 mm / s, drives the mounting cylinder 6 and the sampling cylinder 9 to rotate into the soil. When the edge of the notch 16 on the side wall of the mounting cylinder 6 contacts the top of the U-shaped block 30, the rotation and downward pressing are stopped.

[0057] Step four, pull the sliding circular plate 25 upward to compress the first compression spring 24, so that the rectangular limiting block 27 disengages from the rotating strip-shaped plate 23. After the rotating strip-shaped plate 23 is rotated by ninety degrees to cover the air hole 21, the sliding circular plate 25 is released, the first compression spring 24 pushes the rectangular limiting block 27 to clamp the edge of the rotating strip-shaped plate 23 to realize locking.

[0058] Step five, press the U-shaped block 30 again to make the card bar 31 out of the card slot 14, slide the L-shaped block 34 and the dust removal cylinder 4 to the lowest position. Rotate the hand wheel 5 counterclockwise to lift the sampling cylinder 9, and the outer wall of the sampling cylinder 9 is scraped to remove the residual soil when passing through the dust removal cylinder 4. After the sample is taken out through the sampling port 3, the device is reset.

[0059] However, as known to those skilled in the art, the working principle and wiring method of the servo motor 20 are common, which are all conventional means or common general knowledge, and will not be described here. Those skilled in the art can make any selection according to their needs or convenience.

[0060] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art can make equivalent replacement or change according to the technical solution and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A soil sampling device, characterized in that: include: A base plate (1), wherein an annular mounting cavity (11) is provided at the bottom of the base plate (1), and a plurality of red laser lamps (10) are fixedly mounted inside the annular mounting cavity (11), and the red laser lamps (10) are used to form an annular light spot on the ground to locate the sampling center; A top plate (7) fixedly connected to the top of the bottom plate (1); Two connecting side plates (8) fixedly connected between the bottom plate (1) and the top plate (7); A mounting cylinder (6) slidably disposed on the connecting side plate (8); A sampling cylinder (9) is rotatably mounted inside the mounting cylinder (6) and is used for collecting soil samples; An adjustment component, disposed on the top of the top plate (7), for adjusting the height of the mounting cylinder (6); A limiting component, slidably connected to the connecting side plate (8), for limiting the sampling depth; An anti-drop component, arranged on the top of the sampling cylinder (9), for preventing the sample from falling; The sampling cylinder (9) is driven to rotate by a servo motor (20), and the adjustment component controls the descending speed of the sampling cylinder (9) to achieve soil sampling.

2. The soil sampling device according to claim 1, characterized in that The adjustment assembly includes a screw rod (12), the screw rod (12) rotates through the top plate (7) and is threaded through a rectangular slider (19), the rectangular slider (19) is slidably connected in a first slide groove (13), the first slide groove (13) is opened on one side of the connecting side plate (8), and the bottom of the screw rod (12) is rotatably connected to the bottom of the first slide groove (13).

3. The soil sampling device according to claim 1, characterized in that: The limiting component includes an L-shaped slider (34), the L-shaped slider (34) is slidably connected in the second slide groove (15), the second slide groove (15) is opened on one side of the connecting side plate (8), the top of the L-shaped slider (34) is slidably connected to two sliding strip plates (28), a second compression spring (32) is provided between the two sliding strip plates (28), and a clamping rod (31) is fixedly connected to the side of the two sliding strip plates (28) away from each other, and a plurality of equally spaced clamping grooves (14) are opened on the inner walls on both sides of the second slide groove (15), and the clamping rod (31) is engaged with the clamping groove (14).

4. The soil sampling device according to claim 3, characterized in that: A U-shaped block (30) is slidably connected to the L-shaped slider (34), a third compression spring (33) is provided between the bottom of the U-shaped block (30) and the top of the L-shaped slider (34), and triangular blocks (29) are fixedly connected to the inner walls on both sides of the U-shaped block (30), and the inclined surface of the triangular block (29) contacts the sliding strip plate (28) to push the sliding strip plate (28) to move laterally.

5. The soil sampling device according to claim 4, characterized in that: It also includes a dust removal cylinder (4), the outer wall of which is conical and the inner diameter of which matches the outer diameter of the sampling cylinder (9), and the dust removal cylinder (4) is fixedly connected to the side of the two L-shaped sliders (34) close to each other, and is used to scrape soil off the outer wall of the sampling cylinder (9).

6. The soil sampling device according to claim 1, characterized in that: The anti-drop assembly comprises a fixed cylinder (26), the fixed cylinder (26) is fixedly connected to the top of the sampling cylinder (9), the outer wall of the fixed cylinder (26) is rotatably sleeved with a rotating strip plate (23), the top of the sampling cylinder (9) is provided with two exhaust holes (21), and the rotating strip plate (23) is used to block the exhaust holes (21).

7. The soil sampling device according to claim 6, characterized in that: The top of the fixed cylinder (26) is fixedly connected to the limit cover plate (22), and the outer wall of the fixed cylinder (26) is slidingly sleeved with a sliding circular plate (25). A first compression spring (24) is provided between the bottom of the limit cover plate (22) and the top of the sliding circular plate (25). Both ends of the first compression spring (24) are in contact with the bottom of the limit cover plate (22) and the top of the sliding circular plate (25) through a spring seat. The bottom of the sliding circular plate (25) is fixedly connected to a rectangular limit block (27), and the rectangular limit block (27) is used to limit the rotating strip plate (23).

8. The soil sampling device according to claim 1, characterized in that: Notches (16) are provided on both sides of the installation tube (6), and side rectangular blocks (17) are fixedly connected to both sides of the installation tube (6). The side rectangular blocks (17) are used to interfere with the limiting component to terminate sampling.

9. The soil sampling device according to any one of claims 1 to 8, characterized in that: The output torque of the servo motor (20) is dynamically adjustable to 0-12 N·m, and the sampling cylinder (9) is provided with a spiral blade with an attack angle of 15°.

10. A soil sampling positioning method, applied to the soil sampling device according to claim 8, characterized in that: The following steps are involved: S1, moving the device to the sampling position and forming a light spot on the ground by a red laser lamp (10) to locate the sampling center; S2. Adjust the limiting component to the target depth position; S3, starting the servo motor (20) to drive the sampling cylinder (9) to rotate, and at the same time operating the adjustment component to make the sampling cylinder (9) descend to collect soil samples; S4. Before lifting the sampling tube (9), operate the anti-drop assembly to seal the air hole (21); S5. Lift the sampling cylinder (9) and scrape off the soil on the outer wall through the dust removal cylinder (4).

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