Soil sampling device capable of preventing cross contamination of samples

Abstract

A soil sampling device capable of preventing cross contamination of samples relates to the technical field of soil sampling devices and comprises a movably arranged base, two lower rotating circular plates which are synchronously and rotatably arranged are rotatably arranged at the top of the base along a plumb line, and a first U-shaped plate and a second U-shaped plate which are vertically arranged are fixedly arranged at the tops of the two lower rotating circular plates respectively. The first U-shaped plate and the second U-shaped plate are internally provided with sliding plates which are vertically arranged in a sliding mode, one ends of the two sliding plates extend to the exteriors of the first U-shaped plate and the second U-shaped plate respectively and are provided with an auger and a sampling barrel which are arranged in a rotating mode along a plumb line respectively, and the bottom of the sampling barrel is provided with an opening; a circular groove is formed in the position, between the two lower rotating circular plates, of the top of the base in a penetrating mode, and a post-processing assembly is arranged at the top of the base. The soil sampling device disclosed by the utility model solves the problems of low sampling efficiency and cross contamination of sampled samples when the existing soil sampling device is used for sampling soil.

Description

Technical Field

[0001] The utility model relates to the technical field of soil sampling devices, in particular to a soil sampling device capable of preventing cross contamination of samples. Background Art

[0002] Soil refers to a loose layer of material on the surface of the earth, which is composed of various granular minerals, organic matter, water, air, microorganisms, etc., and can grow plants. As people gradually pay more attention to soil conditions, soil improvement is a top priority for poor soil conditions. It mainly uses certain theoretical knowledge and scientific and technological means to eliminate or prevent adverse factors that affect crop growth and cause soil degradation, improve soil properties, and increase soil fertility. In the process of soil improvement, it is necessary to sample and test the target soil through a sampling device, and then formulate corresponding improvement measures according to the specific conditions of the soil.

[0003] The existing soil sampling device still has the problems of low sampling efficiency and cross-contamination of sampled samples during the soil sampling process. Specifically, before sampling the soil, it is necessary to use an excavation tool to make a hole in the soil, and then use the sampling device to sample the soil in the soil hole. When continuously sampling soil at different depths at the same location, it is necessary to frequently change the excavation tool and the sampling device. The sampling process is cumbersome, resulting in low sampling efficiency. At the same time, the inner wall of the sampling tube on the sampling device is easily attached to the soil in the previous sampling process, and soil samples at different depths are mixed, resulting in cross-contamination of soil samples.

[0004] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] In view of the defects in the prior art, the technical problem to be solved by the utility model is to provide a soil sampling device that prevents cross-contamination of samples. The device can quickly sample soil at different depths at the same location, and can also effectively prevent cross-contamination of soil samples during the sampling process, thereby improving the accuracy of the samples.

[0006] In order to solve the above problems, the utility model provides the following technical solutions:

[0007] A soil sampling device for preventing cross contamination of samples comprises a movably arranged base, the top of the base is provided with two synchronously rotating lower rotating circular plates that rotate along a plumb line, the tops of the two lower rotating circular plates are respectively fixed with a first U-shaped plate and a second U-shaped plate that are vertically arranged, the interiors of the first U-shaped plate and the second U-shaped plate are both provided with sliding plates that slide vertically, one end of the two sliding plates respectively extends to the outside of the first U-shaped plate and the second U-shaped plate and are respectively provided with an auger and a sampling barrel that rotate along a plumb line, the bottom of the sampling barrel is open, the top of the base is located between the two lower rotating circular plates and is penetrated by a circular groove,

[0008] A post-processing component is disposed on the top of the base, through which the soil in the sampling cylinder can be collected and the inner wall of the sampling cylinder can be cleaned.

[0009] As an optimized solution, the post-processing assembly includes an upper rotating circular plate rotatably arranged along a plumb line, and the top of the upper rotating circular plate is vertically fixed with two fixed pipes symmetrically arranged along its axial section, and the lower ports of the two fixed pipes both pass through the upper rotating circular plate.

[0010] The two fixed tubes are each provided with a lifting plate arranged for vertical lifting, and the tops of the two lifting plates are respectively provided with a rotating plate and a horizontal plate arranged for rotation along a plumb line, and the bottom of the horizontal plate is fixedly connected with two vertical plates arranged symmetrically along the cross section of the fixed tube axis, and the opposite ends of the two vertical plates and the top of the horizontal plate are provided with bristles;

[0011] A plurality of fixed teeth are evenly distributed on the top of the rotating plate, and a placement rack is fixedly provided at a position below one of the fixed tubes at the bottom of the upper rotating circular plate, wherein a collecting cylinder with an opening at the top is placed in the placement rack.

[0012] As an optimized solution, an air distribution cylinder is fixedly provided above the fixed tube, and a plurality of exhaust holes connected to the inner cavity of the air distribution cylinder are evenly distributed on the bottom of the air distribution cylinder. A fan is fixedly provided on the top of the base, and the air outlet of the fan is connected to the inner cavity of the air distribution cylinder through a ventilation pipe.

[0013] As an optimized solution, a waste discharge groove is provided through the top of the base, and the soil dropped during the cleaning process of the inner wall of the sampling tube can be discharged to the ground through the waste discharge groove.

[0014] As an optimized solution, a plurality of soil-breaking teeth are evenly distributed along the circumference of the bottom of the sampling tube, and the soil-breaking teeth can help the sampling tube to penetrate deeply into the soil for sampling.

[0015] As an optimized solution, rotatable moving wheels are provided at the four corners of the bottom of the base, and two handrails are fixedly connected to the side walls of the base.

[0016] As an optimized solution, the first U-shaped plate and the second U-shaped plate are respectively provided with single-thread screws rotatably arranged along the plumb line, and one end of the two single-thread screws respectively passes through the two sliding plates and is correspondingly threadedly connected to the two sliding plates.

[0017] As an optimized solution, a rotating rod is provided on the top of the base for rotating along the plumb line, and the top end of the rotating rod extends upward and is fixedly connected to the upper rotating circular plate.

[0018] As an optimized solution, one of the lower rotating circular plate and the rotating rod is respectively fixed with a first limit plate and a second limit plate, and the top of the base is respectively fixed with two first positioning plates symmetrically arranged along the axial cross-section of the lower rotating circular plate and two second positioning plates symmetrically arranged along the axial cross-section of the rotating rod.

[0019] As an optimized solution, a horizontally arranged fixing plate is fixedly connected to the inner wall of the fixing tube, two telescopic cylinders are fixedly connected to the top of the fixing plate, and the telescopic ends of the two telescopic cylinders are fixedly connected to the lifting plate.

[0020] Compared with the prior art, the beneficial effects of the utility model are:

[0021] 1. When the auger rotates to the top of the circular groove, the sampling tube rotates to the top of the post-processing component. The auger passes through the circular groove and opens a hole in the soil during its downward movement. At the same time, the post-processing component collects the soil in the sampling tube. When the sampling tube rotates to the top of the circular groove, the auger rotates to the avoidance area. The sampling tube samples the soil in the soil hole during its downward movement. Repeating the above process can realize the function of rapid sampling of soil at different depths at the same position, thereby improving the efficiency of soil sampling;

[0022] 2. When the sampling tube rotates to the top of the post-processing component, the post-processing component can collect the soil in the sampling tube and quickly clean the soil attached to the inner wall of the sampling tube, effectively preventing cross contamination of soil samples and improving the accuracy of soil samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0024] Figure 1 It is a schematic diagram of the structure of the utility model;

[0025] Figure 2 It is a structural schematic diagram of the post-processing component of the utility model;

[0026] Figure 3 It is a structural schematic diagram of the first limiting plate of the utility model;

[0027] Figure 4 It is a structural schematic diagram of the driving wheel of the utility model;

[0028] Figure 5 It is a structural schematic diagram of the placement rack of the utility model.

[0029] In the figure: 1-base; 2-lower rotating circular plate; 3-single threaded rod; 4-first U-shaped plate; 5-auger; 6-sliding plate; 7-second U-shaped plate; 8-first servo motor; 9-second servo motor; 10-rotating shaft; 11-sampling cylinder; 12-post-processing component; 13-upper rotating circular plate; 14-handrail; 15-ventilation pipe; 16-blower; 17-rotating rod; 18-waste discharge trough; 19-circular trough; 20-moving wheel; 21-collecting cylinder; 22-placing rack; 23-fixed plate ; 24-fixed pipe; 25-telescopic cylinder; 26-control motor; 27-lifting plate; 28-rotating plate; 29-fixed teeth; 30-ground-breaking teeth; 31-exhaust hole; 32-air cloth cylinder; 33-horizontal plate; 34-vertical plate; 35-brush; 36-first drive motor; 37-drive wheel; 38-transmission belt; 39-avoidance wheel; 40-driven wheel; 41-second drive motor; 42-first limit plate; 43-first positioning plate; 44-second positioning plate; 45-second limit plate. DETAILED DESCRIPTION

[0030] The following embodiments of the technical solution of the utility model are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and are therefore only used as examples, and cannot be used to limit the protection scope of the utility model.

[0031] like Figures 1 to 5 As shown, a soil sampling device for preventing cross contamination of samples comprises a movable base 1, the top of the base 1 is provided with two synchronously rotating lower rotating circular plates 2 which rotate along a plumb line, the tops of the two lower rotating circular plates 2 are respectively fixed with a vertically arranged first U-shaped plate 4 and a second U-shaped plate 7, the interiors of the first U-shaped plate 4 and the second U-shaped plate 7 are both provided with a vertically sliding sliding plate 6, one end of the two sliding plates 6 respectively extends to the outside of the first U-shaped plate 4 and the second U-shaped plate 7 and are respectively provided with an auger 5 and a sampling barrel 11 which rotate along a plumb line, the bottom of the sampling barrel 11 is open, the top of the base 1 is located between the two lower rotating circular plates 2 and is penetrated by a circular groove 19,

[0032] A post-processing component 12 is provided on the top of the base 1, through which the soil in the sampling tube 11 can be collected and the inner wall of the sampling tube 11 can be cleaned;

[0033] When the auger 5 rotates to the top of the circular groove 19, the sampling tube 11 rotates to the top of the post-processing assembly 12. The auger 5 passes through the circular groove 19 and makes holes in the soil during its downward movement. At the same time, the post-processing assembly 12 collects the soil in the sampling tube 11 and cleans the inner wall of the sampling tube 11.

[0034] When the sampling tube 11 rotates to the top of the circular groove 19, the auger 5 rotates to the avoidance area, and the soil in the soil hole is sampled during the downward movement of the sampling tube 11.

[0035] The post-processing assembly 12 includes an upper rotating circular plate 13 that is rotatably arranged along a plumb line. Two fixed pipes 24 that are symmetrically arranged along the axial section of the upper rotating circular plate 13 are vertically fixedly connected to the top of the upper rotating circular plate 13. The lower ports of the two fixed pipes 24 both pass through the upper rotating circular plate 13.

[0036] A lifting plate 27 is provided in each of the two fixed tubes 24. A rotating plate 28 and a horizontal plate 33 are provided on the top of each of the two lifting plates 27. The bottom of the horizontal plate 33 is fixedly connected to two vertical plates 34 symmetrically arranged along the axial section of the fixed tube 24. Brushes 35 are provided on the opposite ends of the two vertical plates 34 and the top of the horizontal plate 33.

[0037] A plurality of fixed teeth 29 are evenly distributed on the top of the rotating plate 28. A placement rack 22 is fixedly provided at the bottom of the upper rotating circular plate 13 below one of the fixed tubes 24. A collecting cylinder 21 with an opening at the top is placed in the placement rack 22.

[0038] When the fixed tube 24 with a rotating plate 28 inside is coaxial with the sampling tube 11, the rotating plate 28 rotating along the plumb line breaks the soil in the sampling tube 11 with the fixed teeth 29 during the rising process, and the broken soil falls into the fixed tube 24 and falls into the collecting tube 21 through the fixed tube 24;

[0039] When the fixed tube 24 with a horizontal plate 33 inside is coaxial with the sampling tube 11, the horizontal plate 33 and the two vertical plates 34 rotating along the plumb line clean the soil attached to the inner wall of the sampling tube 11 with bristles 35 during the rising process, and the cleaned soil falls into the fixed tube 24 and is discharged to the outside through the fixed tube 24.

[0040] An air distribution cylinder 32 is fixedly provided above the fixed pipe 24, and a plurality of exhaust holes 31 are evenly distributed at the bottom of the air distribution cylinder 32 and are connected to the inner cavity thereof. A fan 16 is fixedly provided at the top of the base 1, and the air outlet of the fan 16 is connected to the inner cavity of the air distribution cylinder 32 through the ventilation pipe 15;

[0041] When the fixed pipe 24 with a rotating plate 28 inside rotates to be coaxial with the gas distribution cylinder 32, the gas is discharged to the fixed pipe 24 through the exhaust hole 31 on the gas distribution cylinder 32, thereby cleaning the remaining soil in the fixed pipe 24, and the cleaned soil falls into the collecting cylinder 21.

[0042] A waste discharge groove 18 is provided through the top of the base 1 , and the soil dropped during the cleaning process of the inner wall of the sampling tube 11 can be discharged to the ground through the waste discharge groove 18 , thereby keeping the base 1 clean.

[0043] The bottom of the sampling tube 11 is evenly distributed with a plurality of soil-breaking teeth 30 along the circumferential direction. The soil-breaking teeth 30 can help the sampling tube 11 to penetrate deeply into the soil for sampling.

[0044] The four corners of the bottom of the base 1 are all provided with rotatable moving wheels 20 , and two handrails 14 are fixedly connected to the side wall of the base 1 .

[0045] The first U-shaped plate 4 and the second U-shaped plate 7 are respectively provided with single-thread screws 3 rotatably arranged along the plumb line. One ends of the two single-thread screws 3 pass through the two sliding plates 6 respectively and are correspondingly threadedly connected to the two sliding plates 6 .

[0046] The side walls of the two sliding plates 6 are slidably connected to the inner walls of the first U-shaped plate 4 and the second U-shaped plate 7 .

[0047] Two ends of the two single-thread screw rods 3 are rotatably connected to the inner top and inner bottom of the first U-shaped plate 4 and the second U-shaped plate 7 .

[0048] The first servo motors 8 are fixedly mounted on the top of the first U-shaped plate 4 and the second U-shaped plate 7 . The output ends of the two first servo motors 8 pass through the first U-shaped plate 4 and the second U-shaped plate 7 and are fixedly connected to the two single-thread screws 3 .

[0049] A rotating shaft 10 is provided at the bottom of one of the sliding plates 6 so as to rotate along the plumb line. The bottom end of the rotating shaft 10 extends downward and is fixedly connected to the sampling tube 11 .

[0050] A second servo motor 9 is fixedly mounted on the top of the two sliding plates 6 . The output ends of the two second servo motors 9 pass through the two sliding plates 6 and are fixedly connected to the auger 5 and the rotating shaft 10 respectively.

[0051] A rotating rod 17 is provided on the top of the base 1 to rotate along the plumb line. The top end of the rotating rod 17 extends upward and is fixedly connected to the upper rotating circular plate 13 .

[0052] A first limiting plate 42 and a second limiting plate 45 are fixedly connected to one of the lower rotating circular plate 2 and the rotating rod 17, respectively. Two first positioning plates 43 symmetrically arranged along the axial section of the lower rotating circular plate 2 and two second positioning plates 44 symmetrically arranged along the axial section of the rotating rod 17 are fixedly arranged on the top of the base 1;

[0053] The two first positioning plates 43 and the two second positioning plates 44 can limit the rotation angles of the lower rotating plate 28 and the rotating rod 17 , thereby reducing the time consumed in adjusting the angles of the lower rotating circular plate 28 and the rotating rod 17 .

[0054] A driving wheel 37 and a driven wheel 40 are provided at the bottom of the base 1 for rotation along the plumb line. The driving wheel 37 and the driven wheel 40 are connected to the two lower rotating circular plates 2 respectively. Two avoidance wheels 39 are provided between the driving wheel 37 and the driven wheel 40 for rotation along the plumb line. The driving wheel 37, the driven wheel 40 and the two avoidance wheels 39 are evenly distributed around the circular groove 19 and are connected by a transmission belt 38.

[0055] A first driving motor 36 is fixedly disposed at the bottom of the base 1 , and an output end of the first driving motor 36 is fixedly connected to a driving wheel 37 .

[0056] A second driving motor 41 is fixedly disposed at the bottom of the base 1 , and an output end of the second driving motor 41 passes through the base 1 and is fixedly connected to the rotating rod 17 .

[0057] A horizontally arranged fixing plate 23 is fixedly connected to the inner wall of the fixing tube 24 , two telescopic cylinders 25 are fixedly connected to the top of the fixing plate 23 , and the telescopic ends of the two telescopic cylinders 25 are fixedly connected to the lifting plate 27 .

[0058] The control motors 26 are fixedly mounted at the bottom of the two lifting plates 27 . The output ends of the two control motors 26 pass through the two lifting plates 27 and are fixedly connected to the rotating plate 28 and the horizontal plate 33 , respectively.

[0059] The working principle of this device is:

[0060] When sampling soil at different depths at the same location, the staff holds the handrail 14 to move the device to the desired position, and the first servo motor 8 and the second servo motor 9 on the first U-shaped plate 4 respectively drive the single-thread screw 3 and the auger 5 to rotate. During the rotation of the single-thread screw 3, the sliding plate 6 and the auger 5 can be driven to move downward, and the auger 5 passes through the circular groove 19 and makes a hole in the soil. After the auger 5 descends to the first soil sampling depth, the first servo motor 8 on the first U-shaped plate 4 rotates in the opposite direction until the sliding plate 6 is reset, and the first drive motor 36 drives the drive wheel 37 and the transmission The belt 38, the driven wheel 40 and the two avoidance wheels 39 rotate, thereby driving the two lower rotating circular plates 2 to rotate synchronously, thereby driving the first U-shaped plate 4 and the second U-shaped plate 7 to rotate synchronously, until the first limit plate 42 rotates to abut against one of the first positioning plates 43, at which time the auger 5 rotates to the avoidance area, the sampling tube 11 is coaxial with the circular groove 19, and the first servo motor 8 and the second servo motor 9 on the second U-shaped plate 7 respectively drive the single-thread screw 3 and the rotating shaft 10 to rotate, and the single-thread screw 3 can drive the sliding plate 6, the rotating shaft 10 and the sampling tube 11 to move downward during the rotation process. The sampling tube 11 passes through the circular groove 19 into the soil hole and samples the soil. After the sampling is completed, the first servo motor 8 on the second U-shaped plate 7 rotates in the opposite direction until the sampling tube 11 is reset, and the first drive motor 36 rotates in the opposite direction, thereby driving the two lower rotating circular plates 2 to rotate synchronously, thereby driving the first U-shaped plate 4 and the second U-shaped plate 7 to rotate synchronously until the first limit plate 42 rotates to abut against the other first positioning plate 43. At this time, the auger 5 is coaxial with the circular groove 19, the sampling tube 11 is coaxial with one of the fixed tubes 24, and the two telescopic cylinders 2 in the fixed tube 24 are 5 is extended and drives the lifting plate 27 to rise, and at the same time controls the motor 26 to drive the rotating plate 28 to rotate. When the rotating plate 28 rises to the inside of the sampling tube 11, the fixed teeth 29 crush the soil in the sampling tube 11, and the crushed soil falls into the collecting tube 21 through the fixed tube 24 for collection. During the process of transferring the soil in the sampling tube 11 to the collecting tube 21, the auger 5 can continue to open holes in deeper areas of the soil. Replacing a new collecting tube 21 and repeating the above operation can realize the function of quickly sampling soil at different depths at the same position, thereby improving the efficiency of soil sampling;

[0061] After the soil in the sampling tube 11 falls into the collecting tube 21 through the fixed tube 24, the second driving motor 41 drives the rotating rod 17 to rotate, and then drives the upper rotating circular plate 13 to rotate, thereby driving the two fixed tubes 24 to rotate, until the second limit plate 45 rotates to abut against one of the second positioning plates 44. At this time, the other fixed tube 24 is coaxial with the sampling tube 11, and the two telescopic cylinders 25 in the fixed tube 24 are extended and drive the lifting plate 27 to rise. At the same time, the control motor 26 drives the horizontal plate 33 and the two vertical plates 34 to rotate. During the rising process of the horizontal plate 33 and the two vertical plates 34, the bristles 35 clean the inner wall of the sampling tube 11, and the cleaned soil falls to the outside of the fixed tube 24. The part falls to the ground through the waste discharge chute 18. During the cleaning process of the sampling tube 11, the fan 16 transports gas to the air distribution tube 32 through the ventilation pipe 15. The gas in the air distribution tube 32 is discharged to one of the fixed tubes 24 through the exhaust hole 31, and then the residual soil in the fixed tube 24 is cleaned. The cleaned soil falls into the collecting tube 21. The staff seals the collecting tube 21 and places the new collecting tube 21 on the placement rack 22. The cleaned sampling tube 11 can sample the soil at the next depth. By cleaning the inner wall of the sampling tube 11 and the inside of the fixed tube 24, cross-contamination of soil samples is effectively prevented, and the accuracy of soil samples is improved.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model, and they should all be included in the scope of the claims and specification of the utility model.

Claims

1. A soil sampling device for preventing cross contamination of samples, characterized in that: The invention comprises a movably arranged base (1), wherein the top of the base (1) is provided with two synchronously rotating lower rotating circular plates (2) which rotate along a vertical line, and the tops of the two lower rotating circular plates (2) are respectively fixed with a first U-shaped plate (4) and a second U-shaped plate (7) which are arranged vertically, and the insides of the first U-shaped plate (4) and the second U-shaped plate (7) are both provided with a sliding plate (6) which is arranged to slide vertically, and one end of the two sliding plates (6) respectively extends to the outside of the first U-shaped plate (4) and the second U-shaped plate (7) and is respectively provided with an auger (5) and a sampling barrel (11) which are arranged to rotate along a vertical line, and the bottom of the sampling barrel (11) is open, and the top of the base (1) is located between the two lower rotating circular plates (2) and is penetrated by a circular groove (19), A post-processing component (12) is provided on the top of the base (1), and the soil in the sampling tube (11) can be collected and the inner wall of the sampling tube (11) can be cleaned by the post-processing component (12).

2. A soil sampling device for preventing cross contamination of samples according to claim 1, characterized in that: The post-processing assembly (12) comprises an upper rotating circular plate (13) rotatably arranged along a vertical line, the top of the upper rotating circular plate (13) is vertically fixed with two fixed pipes (24) symmetrically arranged along its axial section, and the lower ports of the two fixed pipes (24) both pass through the upper rotating circular plate (13). A lifting plate (27) is provided in each of the two fixed tubes (24) for vertical lifting. A rotating plate (28) and a horizontal plate (33) are provided on the top of each of the two lifting plates (27) for rotation along a vertical line. The bottom of the horizontal plate (33) is fixedly connected with two vertical plates (34) symmetrically arranged along the axial section of the fixed tube (24). Brushes (35) are provided on the opposite ends of the two vertical plates (34) and on the top of the horizontal plate (33). A plurality of fixed teeth (29) are evenly distributed on the top of the rotating plate (28), and a placement rack (22) is fixedly provided at a position below one of the fixed tubes (24) at the bottom of the upper rotating circular plate (13), wherein a collecting cylinder (21) with an opening at the top is placed in the placement rack (22).

3. A soil sampling device for preventing cross contamination of samples according to claim 2, characterized in that: An air distribution cylinder (32) is fixedly provided above the fixed pipe (24), and a plurality of exhaust holes (31) are evenly distributed on the bottom of the air distribution cylinder (32) and are connected to the inner cavity thereof. A fan (16) is fixedly provided on the top of the base (1), and an air outlet of the fan (16) is connected to the inner cavity of the air distribution cylinder (32) via a ventilation pipe (15).

4. A soil sampling device for preventing cross contamination of samples according to claim 3, characterized in that: A waste discharge groove (18) is provided through the top of the base (1), and soil dropped during the cleaning process of the inner wall of the sampling tube (11) can be discharged to the ground through the waste discharge groove (18).

5. A soil sampling device for preventing cross contamination of samples according to claim 4, characterized in that: The bottom of the sampling tube (11) is evenly distributed with a plurality of soil-breaking teeth (30) along the circumferential direction, and the soil-breaking teeth (30) can help the sampling tube (11) to penetrate deeply into the soil for sampling.

6. A soil sampling device for preventing cross contamination of samples according to claim 5, characterized in that: The four corners of the bottom of the base (1) are each provided with a rotatable moving wheel (20), and two handrails (14) are fixedly connected to the side wall of the base (1).

7. A soil sampling device for preventing cross contamination of samples according to claim 6, characterized in that: The first U-shaped plate (4) and the second U-shaped plate (7) are respectively provided with a single-thread screw (3) rotatably arranged along a vertical line, and one end of the two single-thread screws (3) respectively passes through two sliding plates (6) and is correspondingly threadedly connected to the two sliding plates (6).

8. A soil sampling device for preventing cross contamination of samples according to claim 7, characterized in that: A rotating rod (17) is provided at the top of the base (1) for rotation along a vertical line, and the top end of the rotating rod (17) extends upward and is fixedly connected to the upper rotating circular plate (13).

9. A soil sampling device for preventing cross contamination of samples according to claim 8, characterized in that: A first limit plate (42) and a second limit plate (45) are fixedly connected to one of the lower rotating circular plate (2) and the rotating rod (17), respectively. Two first positioning plates (43) symmetrically arranged along the axial section of the lower rotating circular plate (2) and two second positioning plates (44) symmetrically arranged along the axial section of the rotating rod (17) are fixedly arranged on the top of the base (1).

10. A soil sampling device for preventing cross contamination of samples according to claim 9, characterized in that: A horizontally arranged fixing plate (23) is fixedly connected to the inner wall of the fixing tube (24), two telescopic cylinders (25) are fixedly connected to the top of the fixing plate (23), and the telescopic ends of the two telescopic cylinders (25) are fixedly connected to the lifting plate (27).

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