Depth-controllable soil sample collection device

Abstract

The invention belongs to the technical field of soil sampling, and provides a depth-controllable soil sample collecting device which comprises a drill barrel, a detachable drill bit is arranged at the bottom of the drill barrel, the drill bit is communicated with the interior of the drill barrel, a motor externally connected with a power source is arranged at the top of the drill barrel, a sampling pipe is arranged in the drill barrel and is a hollow pipe, and a sampling pipe is arranged in the drill barrel. The bottom of the sampling pipe abuts against the interior of the drill bit, and a downward-pressing limiting assembly is arranged in the drill barrel and close to the top and fixes the top of the sampling pipe. The drilling device further comprises mounting plates, the mounting plates are symmetrically arranged on the outer wall of the drilling barrel and mounted close to the top, displacement detectors with vertically-downward lasers are symmetrically arranged at the bottoms of the mounting plates, and an anti-deviation assembly which is movably connected is arranged on the outer wall of the drilling barrel. By setting an automatic mode, the depth of soil sample collection is controllable, and compared with a traditional manual mode, the accuracy of soil sample collection is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of soil sampling, and specifically relates to a soil sample collection device with controllable depth. Background Art

[0002] Soil mapping is to use modern mapping technologies to systematically, scientifically, and comprehensively investigate, monitor, and evaluate soil resources on the earth's surface, aiming to provide data support and decision-making basis for fields such as agricultural production, environmental protection, and land resource management.

[0003] During the mapping process, soil is usually collected, such as:

[0004] Geological mapping: It is necessary to collect soil samples and analyze components, structure, water content, etc. to judge geological structures or disaster risks.

[0005] Soil survey mapping: It is necessary to collect soil samples for laboratory analysis of soil fertility, pH value, heavy metal content, etc.

[0006] Environmental monitoring mapping: It is necessary to collect soil samples to detect the content of pollutants (such as pesticides, heavy metals) or microorganisms.

[0007] However, during the mapping process, it is necessary to control the mapping depth. Traditional depth control relies on manual experience. Judging the sampling depth by manual experience is easily interfered by changes in soil hardness, resulting in sampling deviation. Summary of the Invention

[0008] In order to solve the above technical problems, the present invention provides a soil sample collection device with controllable depth to solve the problems such as large errors in the existing technology when collecting soil samples during mapping, where the collection depth depends on manual judgment.

[0009] A soil sample collection device with controllable depth includes a drill barrel. A detachable drill bit is provided at the bottom of the drill barrel. The drill bit communicates with the inside of the drill barrel. A motor connected to an external power supply is provided at the top of the drill barrel. A sampling tube is provided inside the drill barrel. The sampling tube is a hollow tube. The bottom of the sampling tube abuts against the inside of the drill bit. A downward pressure limiting component is provided inside the drill barrel near the top position to fix the top of the sampling tube.

[0010] It further includes a mounting plate. The mounting plate is symmetrically arranged on the outer wall of the drill barrel and is installed near the top position. Displacement detectors with lasers vertically downward are symmetrically provided at the bottom of the mounting plate. An anti-offset component is movably connected to the outer wall of the drill barrel.

[0011] Preferably, a positioning ring is fixedly connected to the top of the drill bit. A threaded mating portion is provided inside the positioning ring. The outer wall of the drill barrel mates with the threaded mating portion. An installation ring is provided inside the drill bit. The vertical cross-sectional profile of the installation ring is an inverted "T" shape. The installation ring is composed of two ring bodies with different diameters, and the diameter of the upper ring body is smaller than that of the lower ring body. The lower ring body is fixedly connected to the inner wall of the drill bit. An annular card slot is formed between the upper ring body of the installation ring and the drill bit. The bottom of the drill barrel is inserted into the annular card slot.

[0012] Preferably, a sealing disc is provided at the top of the positioning ring. The inner wall of the sealing disc is in movable contact with the outer wall of the drill barrel. Annularly spaced sealing screws are provided on the sealing disc. After the drill bit and the drill barrel are fitted together, the sealing disc fits on the top of the positioning ring, and the sealing screws are tightened into the positioning ring.

[0013] Preferably, a bearing ring is fixedly connected to the top of the positioning ring. The outer wall of the bearing ring is in movable contact with the inside of the drill barrel. The bottom of the sampling tube abuts against the bearing ring. The number of sampling tubes is multiple. Among the upper and lower sampling tubes, insertion rods are symmetrically provided at the bottom of the upper sampling tube. Magnetic attraction rings are respectively provided on the opposite surfaces of the two sampling tubes. After the two sampling tubes are spliced together, the insertion rods are inserted into the lower sampling tube, and the two magnetic attraction rings are attracted to each other.

[0014] Preferably, displacement detectors are distributed on both sides of the drill barrel. Multiple layers of evenly spaced scale lines are provided on the outer wall of the drill barrel. Multiple layers of positioning through holes with different heights are provided on the drill barrel. The drill barrel is threadedly connected to the motor. The inner wall of the sampling tube is coated with a ceramic coating.

[0015] Preferably, the downward pressure limiting assembly includes a positioning insertion plate, a fixed block, a telescopic rod, a return spring, a downward pressure cylinder and a downward pressure block. The downward pressure cylinder is located above the uppermost sampling tube. The fixed block is fixedly connected to the top of the downward pressure cylinder. The telescopic rods are symmetrically connected to the left and right side walls of the fixed block. The positioning insertion plates are symmetrically connected to the other sides of the telescopic rods.

[0016] Preferably, the return spring is sleeved on each telescopic rod. One end of the return spring abuts against the fixed block, and the other end abuts against the positioning insertion plate. The positioning insertion plate cooperates with the positioning through hole. The downward pressure block is fixedly connected to the end of the hydraulic rod of the downward pressure cylinder, and the downward pressure block abuts against the top of the sampling tube. Plugging plates are provided in the other positioning through holes. The plugging plates are movably inserted into the positioning through holes and the outer walls match the outer wall of the drill barrel. Rubber strips inserted into the positioning through holes are provided at the top and bottom of the plugging plates.

[0017] Preferably, the anti-offset component includes a collar, a pin sleeve, a support plate, a first rotating shaft, a positioning plate and a soil-inserting pointed cone. The pin sleeve is fixedly connected to the inner wall of the collar. The drill pipe passes through the pin sleeve and the two are slidably connected. The support plate is fixedly connected to the outer wall of the collar in a ring shape. The first rotating shaft is located at the other end of the support plate and movably penetrates through it. The positioning plates are fixedly connected to both ends of the first rotating shaft. The soil-inserting pointed cones are located at the bottom of the positioning plates and are symmetrically and fixedly connected to the bottom of each positioning plate.

[0018] Preferably, vertical plates distributed annularly are provided at the bottom of the collar and around the periphery of the pin sleeve. A second rotating shaft is movably connected through the bottom of the vertical plate. Firm plates are fixedly connected to both ends of the second rotating shaft. Stable grooves are provided at intervals on the side wall of the positioning plate close to the firm plate. The other end of the firm plate is inserted into the stable groove.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. By providing the drill pipe in the present invention, a motor is connected to the bottom of the drill pipe, and a drill bit is connected to the bottom of the drill pipe. The motor drives the drill pipe to rotate together, thereby driving the drill bit to move downward, and the drill pipe can be driven into the ground. The sampling pipe is located inside the drill pipe and is connected in a communicating manner with the drill bit, so that soil can enter the sampling pipe. A displacement detector is provided on the outer wall of the drill pipe. When the drill pipe rotates, the laser head of the displacement detector detects the height of the ground. During the rotation and downward movement of the drill pipe, people can control the start and stop of the motor and the output power by observing the change in the reading of the displacement detector, and can control the depth of the soil sampled by the sampling pipe. Compared with the traditional manual method, the accuracy of soil sampling depth in the surveying process is improved.

[0021] 2. By installing multiple sampling pipes in the drill pipe in the present invention, the height of each sampling pipe can be set according to the height of underground soil layers. Before collecting soil samples during surveying, the underground soil layer conditions can be collected first, such as the depth of the sand layer and the depth of the aquifer. The height of the sampling pipe is adjusted according to the height of different layered soils. Thus, when the sampling is completed, each sampling pipe is filled with soils of different components. After the sampling pipes are disassembled later, the soils of different components can be collected better, reducing the situation of soil mixing together, and further improving the accuracy of soil sample collection. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the component structure of the overall soil sample collection device of the present invention;

[0023] Figure 2 is a cross-sectional view of the internal component structure of the drill bit of the present invention;

[0024] Figure 3 This is a cross-sectional view of the internal components of the drill pipe and sampling pipe of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of components such as the motor and drill pipe of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the downward pressure limiting component of the present invention;

[0027] Figure 6 This is a schematic diagram of the structure of the drill pipe and the plugging plate of the present invention;

[0028] Figure 7 This is a schematic diagram of the structure of the anti-offset component of the present invention Figure 1 ;

[0029] Figure 8 This is a schematic diagram of the structure of the anti-offset component of the present invention Figure 2 .

[0030] In the figure:

[0031] 1. Drill pipe; 2. Drill bit; 3. Motor; 4. Sampling pipe; 5. Mounting plate; 6. Displacement detector; 7. Positioning ring; 8. Threaded mating part; 9. Mounting ring; 10. Annular card slot; 11. Sealing disc; 12. Sealing screw; 13. Bearing ring; 14. Plug rod; 15. Magnetic attraction ring; 16. Scale line; 17. Positioning perforation; 18. Positioning plug board; 19. Fixed block; 20. Expansion rod; 21. Return spring; 22. Downward pressure cylinder; 23. Downward pressure block; 24. Plugging plate; 25. Rubber strip; 26. Sleeve ring; 27. Pin sleeve; 28. Support plate; 29. Rotating shaft 1; 30. Positioning plate; 31. Soil inserting pointed cone; 32. Vertical plate; 33. Rotating shaft 2; 34. Stabilizing plate; 35. Stabilizing groove. Specific embodiments

[0032] The following further describes in detail the embodiments of the present invention in conjunction with the drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0033] As shown in the attached Figure 1 to the attached Figure 8 figures:

[0034] Embodiment 1: The present invention provides a soil sample collection device with controllable depth, including a drill pipe 1. A detachable drill bit 2 is provided at the bottom of the drill pipe 1. The drill bit 2 communicates with the inside of the drill pipe 1. A motor 3 connected to an external power supply is provided at the top of the drill pipe 1. A sampling pipe 4 is provided inside the drill pipe 1. The sampling pipe 4 is a hollow pipe. The bottom of the sampling pipe 4 abuts against the inside of the drill bit 2. A downward pressure limiting component is provided inside the drill pipe 1 near the top position. The downward pressure limiting component fixes the top of the sampling pipe 4;

[0035] It further includes a mounting plate 5 which is symmetrically arranged on the outer wall of the drill barrel 1 and is installed near the top position. Displacement detectors 6 with vertically downward lasers are symmetrically arranged at the bottom of the mounting plate 5. An anti-offset component is movably connected to the outer wall of the drill barrel 1.

[0036] It should be noted that through the provided drill barrel 1, a motor 3 is connected to the bottom of the drill barrel 1, and a drill bit 2 is connected to the bottom of the drill barrel 1. The motor 3 drives the drill barrel 1 to rotate together, thereby driving the drill bit 2 to move downward, and the drill barrel 1 can be driven into the ground. The sampling tube 4 is located inside the drill barrel 1 and is connected to the drill bit 2 in a mutually communicating manner, so that soil can enter the sampling tube 4. A displacement detector 6 is arranged on the outer wall of the drill barrel 1. When the drill barrel 1 rotates, the laser head of the displacement detector 6 detects the height of the ground. During the rotation and downward movement of the drill barrel 1, people can control the start-stop and output power of the motor 3 by observing the change in the reading of the displacement detector 6 to control the depth of the soil sampled by the sampling tube 4. Compared with the traditional manual method, the accuracy of soil sampling depth in the surveying process is improved.

[0037] The displacement detector 6 is connected to the motor 3 through a PLC controller, and the displacement detection signal is fed back to the controller in real time. The controller automatically adjusts the rotation speed and start-stop of the motor 3 according to the set depth value. The laser emission axis of the displacement detector 6 is parallel to the axis of the drill barrel 1.

[0038] In this embodiment, a positioning ring 7 is fixedly connected to the top of the drill bit 2. A threaded mating portion 8 is arranged inside the positioning ring 7. The outer wall of the drill barrel 1 cooperates with the threaded mating portion 8. An installation ring 9 is arranged inside the drill bit 2. The vertical cross-sectional profile of the installation ring 9 is an inverted "T" shape. The installation ring 9 is composed of two ring bodies with different diameters, and the diameter of the upper ring body is smaller than that of the lower ring body. The lower ring body is fixedly connected to the inner wall of the drill bit 2. An annular slot 10 is formed between the upper ring body of the installation ring 9 and the drill bit 2. The bottom of the drill barrel 1 is inserted into the annular slot 10.

[0039] It should be noted that through the provided positioning ring 7, the positioning ring 7 is integrally processed with the drill bit 2. A threaded mating portion 8 is arranged on the inner wall of the positioning ring 7. The drill barrel 1 is detachably connected to the drill bit 2 through the threaded mating portion 8. After the soil sampling is completed later, the drill bit 2 can be quickly removed. On the one hand, it can be cleaned, and on the other hand, the sampling tube 4 inside the drill barrel 1 can be taken out.

[0040] Through the provided annular slot 10, after the drill barrel 1 rotates on the threaded mating portion 8 and enters the inside of the drill bit 2, it will enter the annular slot 10. The bottom of the drill barrel 1 abuts against the bottom of the annular slot 10, which can further fix the position of the drill barrel 1 and improve the stability after the two are connected.

[0041] In this embodiment, a sealing disc 11 is provided at the top of the positioning ring 7. The inner wall of the sealing disc 11 is in movable contact with the outer wall of the drill pipe 1. The sealing disc 11 is provided with sealing screws 12 distributed at annular intervals. After the drill bit 2 and the drill pipe 1 are matched with each other, the sealing disc 11 fits on the top of the positioning ring 7, and the sealing screws 12 are locked into the positioning ring 7.

[0042] It should be noted that by providing the sealing disc 11 on the positioning ring 7, the sealing disc 11 is movably connected to the outer wall of the drill pipe 1. Since the drill pipe 1 and the drill bit 2 are in threaded cooperation, there will be a gap between them after they are connected to each other. By abutting the sealing disc 11 against the bottom of the drill bit 2, the gap between them can be blocked. The sealing disc 11 can be locked on the top of the drill bit 2 through the sealing screws 12, avoiding the situation that soil enters the gap between the drill bit 2 and the drill pipe 1 during the process of the drill bit 2 drilling into the soil.

[0043] In this embodiment, a fixedly connected bearing ring 13 is provided at the top of the positioning ring 7. The outer wall of the bearing ring 13 is in movable contact with the inside of the drill pipe 1. The bottom of the sampling tube 4 abuts against the bearing ring 13. The number of sampling tubes 4 is multiple. Among the upper and lower two sampling tubes 4, the bottom of the upper sampling tube 4 is symmetrically provided with insertion rods 14, and magnetic attraction rings 15 are respectively provided on the opposite surfaces of the two sampling tubes 4. After the two sampling tubes 4 are spliced together, the insertion rods 14 are inserted into the lower sampling tube 4, and the two magnetic attraction rings 15 are attracted to each other.

[0044] It should be noted that by providing the bearing ring 13 at the top of the positioning ring 7, the bottom of the sampling tube 4 abuts against the bearing ring 13. Thus, when the sampling tube 4 is placed into the bottom of the drill pipe 1, it will contact the bearing ring 13 when it goes down along the drill pipe 1 all the way, avoiding the sampling tube 4 falling out of the drill bit 2.

[0045] A plurality of sampling tubes 4 are installed in the drill pipe 1. The height of each sampling tube 4 can be set according to the height of the underground soil layers. Before collecting soil samples for surveying and mapping, the underground soil layer conditions can be collected first, such as the depth of the sand layer and the depth of the aquifer. The height of the sampling tube 4 is adjusted according to the height of different layered soils. Thus, when the sampling is completed, each sampling tube 4 is filled with soils of different compositions. After the sampling tubes 4 are disassembled later, the soils of different compositions can be collected better, reducing the situation of soils being mixed together, and further improving the accuracy of soil sample collection.

[0046] The insertion rods 14 and the magnetic attraction rings 15 are provided on the sampling tube 4. By inserting the insertion rods 14 into the lower sampling tube 4 and the two magnetic attraction rings 15 being attracted to each other, the two sampling tubes 4 can be connected together, and it is also convenient for later disassembly.

[0047] In this embodiment, displacement detectors 6 are distributed on both sides of the drill pipe 1. Multiple layers of scale lines 16 are evenly arranged on the outer wall of the drill pipe 1. Positioning through holes 17 with multiple heights are provided on the drill pipe 1. The drill pipe 1 is threadedly connected to the motor 3. The inner wall of the sampling pipe 4 is coated with a ceramic coating.

[0048] It should be noted that scale lines 16 are provided on the outer wall of the drill pipe 1. The value of a certain scale line 16 at the initial position is flush with the ground. During the process of soil collection, the scale lines 16 will also enter the soil. By means of the provided scale lines 16, the depth to which the drill pipe 1 descends into the soil can be known, assisting people to better understand the depth of the sampled soil.

[0049] The inner wall of the sampling pipe 4 is coated with a ceramic coating, which can better reduce the friction force after the soil enters the sampling pipe 4, making it easier for the soil to enter the sampling pipe 4.

[0050] In this embodiment, the downward pressing limit component includes a positioning plug board 18, a fixed block 19, a telescopic rod 20, a return spring 21, a downward pressing cylinder 22 and a downward pressing block 23. The downward pressing cylinder 22 is located above the uppermost sampling pipe 4. The fixed block 19 is fixedly connected to the top of the downward pressing cylinder 22. The telescopic rods 20 are symmetrically connected to the left and right side walls of the fixed block 19. The positioning plug board 18 is symmetrically connected to the other side of the telescopic rods 20.

[0051] In this embodiment, the return spring 21 is sleeved on each telescopic rod 20. One end of the return spring 21 abuts against the fixed block 19, and the other end abuts against the positioning plug board 18. And the positioning plug board 18 cooperates with the positioning through hole 17. The downward pressing block 23 is fixedly connected to the end of the hydraulic rod of the downward pressing cylinder 22, and the downward pressing block 23 abuts against the top of the sampling pipe 4. Plugging plates 24 are provided in other positioning through holes 17. The plugging plates 24 are movably inserted into the positioning through holes 17 and the outer walls thereof match the outer wall of the drill pipe 1. Rubber strips 25 inserted into the positioning through holes 17 are provided at the top and bottom of the plugging plates 24.

[0052] It should be noted that through the set pressing limit component, after an appropriate number of sampling tubes 4 are installed, there is a positioning perforation 17 above the uppermost sampling tube 4. At this time, the motor 3 is not yet connected to the drill cylinder 1. Move the two positioning inserts 18 closer to each other. At this time, the length of the telescopic rod 20 becomes shorter, and the return spring 21 is gradually compressed. Insert the positioning insert 18 into the drill cylinder 1. The pressing cylinder 22 will also enter the drill cylinder 1 and move the positioning insert 18 downward. When the positioning insert 18 contacts the positioning perforation 17, the positioning insert 18 and the positioning perforation 17 cooperate with each other, the return spring 21 resets, and the telescopic rod 20 extends, thereby driving the positioning insert 18 into the positioning socket, realizing the fixation of the pressing cylinder 22. At this time, control the hydraulic rod of the pressing cylinder 22 to move downward. Since the sampling tube 4 is movably connected to the drill cylinder 1, the pressing block 23 descends and abuts against the top of the sampling tube 4, thereby fixing the sampling tube 4, avoiding the situation that soil enters the sampling tube 4 during the descent of the drill cylinder 1 and drives the sampling tube 4 to rise together, and avoiding the situation that soil enters the drill cylinder 1 but does not enter the sampling tube 4.

[0053] After the positioning insert 18 enters the positioning perforation 17, there are multiple positioning perforations 17. By inserting the plugging plate 24 into the positioning perforation 17, other positioning perforations 17 can be plugged, avoiding the situation that soil blocks the positioning perforation 17 during the downward movement of the drill cylinder 1.

[0054] In this embodiment, the anti-offset component includes a collar 26, a pin sleeve 27, a support plate 28, a first rotating shaft 29, a positioning plate 30 and an earth-inserting tip cone 31. The pin sleeve 27 is fixedly connected to the inner wall of the collar 26. The drill cylinder 1 passes through the pin sleeve 27 and the two are slidably connected. The support plate 28 is fixedly connected to the outer wall of the collar 26 in a ring shape. The first rotating shaft 29 is located at the other end of the support plate 28 and movably penetrates through it. The positioning plate 30 is fixedly connected to both ends of the first rotating shaft 29. The earth-inserting tip cone 31 is located at the bottom of the positioning plate 30 and is symmetrically and fixedly connected to the bottom of each positioning plate 30.

[0055] It should be noted that through the set anti-offset component, the pin sleeve 27 is movably connected to the drill cylinder 1. The positioning plate 30 can rotate on the support plate 28 through the first rotating shaft 29. The earth-inserting tip cone 31 is arranged at the bottom of the positioning plate 30. The inserting tip cone is inserted into the soil, thereby fixing the collar 26. The inserting tip cone can be fixed at different positions through the rotating positioning plate 30. Even when facing a sloping terrain, fixation can be achieved. When the drill cylinder 1 rotates and moves up and down in the pin sleeve 27, limited by the anti-offset component, the drill cylinder 1 can be prevented from tilting during the sampling process, improving the stability during the soil sampling process.

[0056] In this embodiment, vertical plates 32 are arranged in an annular distribution at the bottom of the collar 26 and around the periphery of the pin sleeve 27. A second rotating shaft 33 is movably and penetratingly connected to the bottom of the vertical plates 32. Fixing plates 34 are fixedly connected to both ends of the second rotating shaft 33. Stable grooves 35 are arranged at intervals on the side wall of the positioning plate 30 close to one side of the fixing plate 34. The other ends of the fixing plates 34 are inserted into the stable grooves 35.

[0057] It should be noted that by arranging the vertical plates 32 at the bottom of the collar 26, the fixing plates 34 are rotatably connected to the vertical plates 32 through the second rotating shaft 33, and the stable grooves 35 are arranged at intervals on the positioning plate 30. After the positioning plate 30 is fixed, the fixing plates 34 can be inserted into the stable grooves 35, so as to further fix the positioning plate 30, avoid the situation that the positioning ring 7 shakes due to the vibration of the drill cylinder 1, and improve the stability.

[0058] The embodiments of the present invention are given for the purposes of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A soil sample collection device with controllable depth, characterized in that: include: A drill barrel (1), wherein a detachable drill bit (2) is provided at the bottom of the drill barrel (1), the drill bit (2) is communicated with the interior of the drill barrel (1), a motor (3) connected to an external power source is provided at the top of the drill barrel (1), a sampling tube (4) is provided inside the drill barrel (1), the sampling tube (4) is a hollow tube, the bottom of the sampling tube (4) abuts against the inside of the drill bit (2), a downward pressure limit assembly is provided inside the drill barrel (1) and near the top, and the downward pressure limit assembly fixes the top of the sampling tube (4); It also comprises a mounting plate (5), which is symmetrically arranged on the outer wall of the drill tube (1) and installed close to the top, and a laser vertical displacement detector (6) facing downward is symmetrically arranged at the bottom of the mounting plate (5), and a movable anti-deviating component is arranged on the outer wall of the drill tube (1).

2. The depth-controllable soil sample collection device according to claim 1, characterized in that: A fixedly connected positioning ring (7) is provided at the top of the drill bit (2), a threaded matching portion (8) is provided inside the positioning ring (7), the outer wall of the drill tube (1) and the threaded matching portion (8) cooperate with each other, a mounting ring (9) is provided inside the drill bit (2), the vertical cross-sectional profile of the mounting ring (9) is an inverted "T" shape, the mounting ring (9) is composed of two sections of ring bodies with different diameters, and the diameter of the upper section of the ring body is smaller than the diameter of the lower section of the ring body, the lower section of the ring body is fixedly connected to the inner wall of the drill bit (2), an annular groove (10) is formed between the upper section of the mounting ring (9) and the drill bit (2), and the bottom of the drill tube (1) is inserted into the annular groove (10).

3. The depth-controllable soil sample collection device according to claim 2, characterized in that: A sealing disk (11) is provided on the top of the positioning ring (7), and the inner wall of the sealing disk (11) is movably fitted with the outer wall of the drill tube (1). The sealing disk (11) is provided with sealing screws (12) distributed in an annular manner. After the drill bit (2) and the drill tube (1) are matched with each other, the sealing disk (11) is fitted on the top of the positioning ring (7), and the sealing screws (12) are locked into the positioning ring (7).

4. The depth-controllable soil sample collection device according to claim 3, characterized in that: A fixedly connected bearing ring (13) is provided on the top of the positioning ring (7), the outer wall of the bearing ring (13) is movably fitted with the inside of the drill pipe (1), the bottom of the sampling tube (4) is abutted against the bearing ring (13), the number of the sampling tube (4) is multiple, and among the upper and lower sampling tubes (4), the bottom of the upper sampling tube (4) is symmetrically provided with an insertion rod (14), and the opposite surfaces of the two sampling tubes (4) are respectively provided with a magnetic attraction ring (15), after the two sampling tubes (4) are spliced ​​together, the insertion rod (14) is lowered into the lower sampling tube (4), and the two magnetic attraction rings (15) are attracted to each other.

5. The depth-controllable soil sample collection device according to claim 1, characterized in that: The displacement detectors (6) are distributed on both sides of the drill tube (1); the outer wall of the drill tube (1) is provided with multiple layers of scale lines (16) evenly spaced apart; the drill tube (1) is provided with multiple layers of positioning holes (17) at different heights; the drill tube (1) is connected to the motor (3) by means of threads; and the inner wall of the sampling tube (4) is coated with a ceramic coating.

6. The depth-controllable soil sample collection device according to claim 5, characterized in that: The downward pressure limit assembly comprises a positioning plug plate (18), a fixed block (19), a telescopic rod (20), a return spring (21), a downward pressure cylinder (22) and a downward pressure block (23); the downward pressure cylinder (22) is located above the uppermost sampling tube (4); the fixed block (19) is fixedly connected to the top of the downward pressure cylinder (22); the telescopic rod (20) is symmetrically connected to the left and right side walls of the fixed block (19); and the positioning plug plate (18) is symmetrically connected to the other side of the telescopic rod (20).

7. The depth-controllable soil sample collection device according to claim 6, characterized in that: The return spring (21) is sleeved on each of the telescopic rods (20), one end of the return spring (21) is in contact with the fixed block (19), and the other end is in contact with the positioning plug plate (18), and the positioning plug plate (18) and the positioning through hole (17) cooperate with each other, the pressing block (23) is fixedly connected to the end of the hydraulic rod of the pressing cylinder (22), and the pressing block (23) is in contact with the top of the sampling tube (4), and a sealing plate (24) is provided in the other positioning through hole (17), the sealing plate (24) is movably inserted into the positioning through hole (17) and the outer wall thereof matches the outer wall of the drill tube (1), and the top and bottom of the sealing plate (24) are provided with rubber strips (25) inserted into the positioning through hole (17).

8. The depth-controllable soil sample collection device according to claim 1, characterized in that: The anti-deviating assembly comprises a collar (26), a pin sleeve (27), a support plate (28), a rotating shaft (29), a positioning plate (30) and a soil inserting cone (31); the pin sleeve (27) is fixedly connected to the inner wall of the collar (26); the drill pipe (1) passes through the pin sleeve (27) and the two are slidably connected; the support plate (28) is annularly fixedly connected to the outer wall of the collar (26); the rotating shaft (29) is located at the other end of the support plate (28) and movably passes through; the positioning plate (30) is fixedly connected to the two ends of the rotating shaft (29); the soil inserting cone (31) is located at the bottom of the positioning plates (30) and is symmetrically fixedly connected at the bottom of each positioning plate (30).

9. The depth-controllable soil sample collection device according to claim 8, characterized in that: A vertical plate (32) distributed in an annular manner is provided at the bottom of the collar (26) and around the periphery of the pin sleeve (27); a second rotating shaft (33) movably connected therethrough is provided at the bottom of the vertical plate (32); fixedly connected stabilizing plates (34) are provided at both ends of the second rotating shaft (33); and stabilizing grooves (35) distributed at intervals are provided on the side wall of the positioning plate (30) close to the stabilizing plate (34); the other end of the stabilizing plate (34) is inserted into the stabilizing groove (35).

Images