A positioning sampling device for soil element detection

Abstract

The present invention discloses a positioning sampling device for soil element detection, and relates to the technical field of soil sampling equipment. It aims to solve the technical problem that when the sampling tube of the existing sampling equipment is recovered, the sample at the lower end of the recovery tube is easy to fall off. It includes a support frame, the support frame is fixedly connected to a symmetrically distributed first motor, the output shaft of the first motor is fixedly connected to a first threaded rod rotatably connected to the support frame, the symmetrically distributed first threaded rods are commonly threadedly connected to a top plate, the lower side of the top plate is fixedly connected to a second motor, the output shaft of the second motor is fixedly connected to a gear, the lower side of the top plate is slidably connected to a circumferentially distributed connecting plate, and the circumferentially distributed connecting plates are commonly fixed to a gear ring. The present invention drives the sealing ring of the second threaded rod to move downward to squeeze the air in the lower cavity of the inner cylinder into the airbag, so that the airbag expands and clamps the soil sample entering the inner cylinder.

Description

Technical Field

[0001] The present invention relates to the technical field of soil sampling equipment, and in particular to a positioning sampling equipment for soil element detection. Background Art

[0002] Soil element testing is a method used to analyze the content of various elements in soil. By testing the element content in the soil, it is possible to assess soil fertility, understand plant nutrient requirements, and predict potential environmental risks.

[0003] Before conducting elemental analysis on the soil, it is necessary to first sample the soil for element detection. However, the element content in soil at different depths often varies. In order to accurately reflect the element content of different soil layers, soil samples at different depths need to be collected and tested during sampling. Existing soil sampling equipment uses a sampling tube to take out soil samples at different depths. However, when recovering the soil samples in this sampling method, the soil sample at the lower end of the sampling tube is easily fallen off due to gravity, resulting in a reduction in the soil sample obtained, causing errors in the element detection results of the soil samples at this depth, or even directly obtaining incorrect element detection results. Summary of the Invention

[0004] In order to overcome the disadvantage that the sample at the lower end of the sampling tube of the existing sampling equipment is easily fallen off during recovery, which causes errors in the test results of the experiment, the present invention provides a positioning sampling device for soil element detection.

[0005] The technical solution of the present invention is: a positioning sampling device for soil element detection, comprising a support frame, the support frame is fixedly connected to a symmetrically distributed first motor, the output shaft of the first motor is fixedly connected to a first threaded rod rotatably connected to the support frame, the symmetrically distributed first threaded rods are commonly threadedly connected to a top plate, the lower side of the top plate is fixedly connected to a second motor, the output shaft of the second motor is fixedly connected to a gear, the lower side of the top plate is slidably connected to a circumferentially distributed connecting plate, the circumferentially distributed connecting plates are commonly fixed to a gear ring, and the gear on the output shaft of the second motor is meshed with the gear ring The lower side surfaces of the circumferentially distributed connecting plates are commonly fixed with an outer cylinder, the upper side of the outer cylinder is fixed with a collecting shell, the inner cylinder is rotatably connected to the interior of the outer cylinder, a cavity is opened at the lower part of the inner cylinder, a sealing ring is slidably connected in the cavity at the lower part of the inner cylinder, the lower part of the inner side wall of the inner cylinder is fixed with a first connecting ring distributed axially at equal intervals, a second connecting ring is fixed to the inner side of the first connecting ring, and airbags are fixed between adjacent first connecting rings, the airbags distributed at equal intervals are all connected to the cavity at the lower part of the inner cylinder, and the inner cylinder is provided with a clamping assembly for driving the sealing ring to move downward.

[0006] As a further optimization, a protective net is provided between adjacent second connecting rings, and the protective net is used to protect the airbag.

[0007] For further optimization, the outer wall of the inner cylinder is provided with an auger that rotates with the outer cylinder.

[0008] Further optimization, the clamping assembly includes a second threaded rod, which is rotatably connected to the inner cylinder, and the upper side of the sealing ring is fixed with a threaded tube that is slidingly connected to the inner cylinder, and the threaded tube is threadedly connected to the second threaded rod, and the top plate is provided with a pressure stabilizing assembly for stabilizing the air pressure in the lower cavity of the inner cylinder.

[0009] Further optimization, the pressure stabilizing assembly includes symmetrically distributed support rods, the symmetrically distributed support rods are all fixed to the lower side of the top plate, the symmetrically distributed support rods are commonly fixed to a third connecting ring, an annular cavity is provided in the third connecting ring, the top plate is embedded with an air intake pipe connected to the annular cavity in the third connecting ring, the upper end of the air intake pipe is fixed with a one-way air valve, the lower side of the third connecting ring is connected to a connecting pipe connected to the lower cavity of the inner cylinder, the inner cylinder and the sealing ring are both slidably connected to the connecting pipe.

[0010] Further optimization also includes a cutting assembly, which is arranged on the top plate and is used to cut the collected soil columns. The cutting assembly includes a rotating shaft, which is rotatably connected to the top plate, and the lower end of the rotating shaft is fixed with a transmission gear. The side wall of the inner cylinder is rotatably connected with a circumferentially distributed rotating rod, and the lower end of the rotating rod is fixed with a sliding shell, and the sliding shell slides with the inner cylinder and the outer cylinder. The sliding shell is slidably connected with a scraper, and the upper end of the rotating rod is fixed with a pinion, and the circumferentially distributed pinions are all meshed with the transmission gear. The top plate is provided with a power assembly for transmitting the rotation of the transmission gear.

[0011] According to a further optimization, the sliding shell and the scraper are both arc-shaped plates, and the centers of the sliding shell and the scraper are consistent with the center of the inner cylinder.

[0012] Further optimization, the power assembly includes a third motor, the third motor is fixedly connected to the lower side of the top plate, the upper side of the inner cylinder is fixedly connected to a transmission gear ring, the circumferentially distributed rotating rods are all rotatably connected to the transmission gear ring, the transmission gear ring is slidably connected to the connecting pipe, the transmission gear ring is rotatably connected to the second threaded rod, the output shaft of the third motor is fixedly connected to a gear, the gear on the output shaft of the third motor is meshed with the transmission gear ring, the inner side of the transmission gear ring is fixedly connected to a bent rod, the bent rod is slidably connected to a limit rod, the lower part of the limit rod is fixedly connected to a limit pin, the upper side of the transmission gear is fixedly connected to a sleeve, and the top plate is provided with a trigger assembly for driving the limit rod to move upward.

[0013] For further optimization, the outer wall of the sleeve is provided with an arc-shaped slide rail inclined along the outer wall, and the limit pin at the lower part of the limit rod is slidably matched with the slide rail provided on the outer wall of the sleeve.

[0014] Further optimization, the trigger assembly includes an electric push rod, which is fixed to the lower side of the top plate, and the telescopic end of the electric push rod is fixed to a fourth connecting ring, and the fourth connecting ring is slidingly connected to the limit rod, and a spring is arranged between the limit rod and the bending rod.

[0015] The beneficial effects of the present invention are as follows: 1. The present invention drives the sealing ring to move downward through the second threaded rod to squeeze the air in the lower cavity of the inner cylinder into the air bag, causing the air bag to expand and clamp the soil sample entering the inner cylinder, thereby preventing the lower end of the soil sample entering the inner cylinder from falling off due to gravity during the rising process, causing errors in the element detection results, thereby improving the accuracy of the element detection results of the soil sample.

[0016] 2. Use the sliding shell and scraper to cut the soil at the specified depth at the lower end of the soil sample, and cooperate with the auger on the inner cylinder to collect the soil sample at the specified depth separately, so as to conduct element detection on the soil sample at this depth separately, avoid the soil from other soil layers from mixing into this part of the soil, and make the element detection result of the soil sample at the specified depth more accurate.

[0017] 3. The relative rotation between the sleeve and the pinion drives the circumferentially distributed sliding shell and scraper to cut the collected soil samples into completed soil columns, ensuring the integrity of soil samples at various depths, thereby making the element detection results at different depths more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0019] Figure 2 This is a three-dimensional structural cross-sectional view of the support frame, outer cylinder, inner cylinder and other parts of the present invention;

[0020] Figure 3 Schematic diagram of the three-dimensional structure of the second motor, connecting plate, gear ring and other parts of the present invention;

[0021] Figure 4 It is a schematic diagram of the three-dimensional structure of the first connecting ring, the second connecting ring and the airbag and other parts of the present invention;

[0022] Figure 5 It is a schematic diagram of the three-dimensional structure of the support rod, the third connecting ring and the air intake pipe and other parts of the present invention;

[0023] Figure 6 Schematic diagram of the three-dimensional structure of the second threaded rod, threaded tube, air valve and other parts of the present invention;

[0024] Figure 7 Schematic diagram of the three-dimensional structure of the third motor, transmission gear ring, bent rod and other parts of the present invention;

[0025] Figure 8 It is a schematic diagram of the three-dimensional structure of the outer cylinder, inner cylinder, scraper and other parts of the present invention;

[0026] Figure 9 It is a schematic diagram of the three-dimensional structure of the rotating rod, sliding shell and scraper of the present invention;

[0027] Figure 10 It is a schematic diagram of the three-dimensional structure of the bending rod, the limiting rod and the sleeve and other parts of the present invention;

[0028] Figure 11 It is a schematic diagram of the three-dimensional structure of the third motor, the electric push rod, the fourth connecting ring and other parts of the present invention.

[0029] Markings in the accompanying drawings: 101-support frame, 102-first motor, 103-first threaded rod, 104-top plate, 105-second motor, 106-connecting plate, 107-gear ring, 108-outer cylinder, 109-inner cylinder, 110-sealing ring, 111-first connecting ring, 112-second connecting ring, 113-airbag, 201-second threaded rod, 202-threaded tube, 301-support rod, 302-third connecting ring, 303-inlet pipe, 304-air valve, 305-connecting pipe, 401-rotating shaft, 402-transmission gear, 403-rotating rod, 404-sliding shell, 405-scraper, 406-pinion, 501-third motor, 502-transmission gear ring, 503-bent rod, 504-limiting rod, 505-sleeve, 601-electric push rod, 602-fourth connecting ring. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0031] Example 1: A positioning sampling device for soil element detection, such as Figure 1-Figure 5 As shown, it includes a support frame 101, and the left and right sides of the support frame 101 are fixed with a first motor 102, the output shaft of the first motor 102 is fixed with a first threaded rod 103, the first threaded rod 103 is rotatably connected to the support frame 101, and a top plate 104 is commonly threadedly connected between the two first threaded rods 103, the left part of the lower side of the top plate 104 is fixed with a second motor 105, the output shaft of the second motor 105 is fixed with a gear, the lower side of the top plate 104 is slidably connected with a circumferentially distributed connecting plate 106, the circumferentially distributed connecting plates 106 are commonly fixed with a gear ring 107, the gear on the output shaft of the second motor 105 is meshed with the gear ring 107, the lower side of the circumferentially distributed connecting plates 106 are commonly fixed with an outer cylinder 108, and the upper side of the outer cylinder 108 is fixed with a collecting shell. The collecting shell is used to collect the inner rotation of the outer cylinder 108 and is connected to the inner cylinder 109. The outer wall of the inner cylinder 109 is provided with an auger that rotates with the outer cylinder 108 and is used to transport soil. A cavity is opened at the lower part of the inner cylinder 109, and a sealing ring 110 is slidably connected in the cavity at the lower part of the inner cylinder 109. The lower part of the inner wall of the inner cylinder 109 is fixed with a first connecting ring 111 distributed axially at equal intervals, and the inner side of the first connecting ring 111 is fixed with a second connecting ring 112. Air bags 113 are fixed between adjacent first connecting rings 111, and a protective net is provided between adjacent second connecting rings 112. The protective net is used to protect the air bags 113. The air bags 113 distributed at equal intervals are all connected to the cavity at the lower part of the inner cylinder 109, and the inner cylinder 109 is provided with a clamping assembly for driving the sealing ring 110 to move downward.

[0032] like Figure 5 and Figure 6 As shown, the clamping assembly includes a second threaded rod 201, which is rotatably connected to the inner cylinder 109, and a threaded tube 202 is fixed to the upper side of the sealing ring 110 and is slidably connected to the inner cylinder 109. The threaded tube 202 is threadedly connected to the second threaded rod 201, and the top plate 104 is provided with a pressure stabilizing assembly for stabilizing the air pressure in the lower cavity of the inner cylinder 109.

[0033] like Figure 1-Figure 5 As shown, the pressure stabilizing assembly includes symmetrically distributed support rods 301, which are all fixed to the lower side of the top plate 104, and the symmetrically distributed support rods 301 are commonly fixed to a third connecting ring 302, and an annular cavity is provided in the third connecting ring 302. The top plate 104 is embedded with an air intake pipe 303 connected to the annular cavity in the third connecting ring 302, and a one-way air valve 304 is fixed to the upper end of the air intake pipe 303. The lower side of the third connecting ring 302 is connected to a connecting pipe 305 connected to the lower cavity of the inner cylinder 109, and the inner cylinder 109 and the sealing ring 110 are both slidably connected to the connecting pipe 305.

[0034] When the equipment is needed to locate and sample the soil that needs to be tested for elements, the staff starts the second motor 105. The second motor 105 rotates through the gear ring 107 on the output shaft. The gear ring 107 rotates through the connecting plate 106 to drive the outer cylinder 108 to rotate. After the outer cylinder 108 starts to rotate, the staff starts the first motor 102. The output shaft of the first motor 102 rotates the first threaded rod 103. The first threaded rod 103 rotates the transmission top plate 104 to drive the components on it to move downward synchronously.

[0035] In the process of the first threaded rod 103 driving the top plate 104 to move downward, when the lower side of the outer cylinder 108 contacts the ground, the outer cylinder 108 begins to transport the soil outside itself to the ground through the auger on it, and the soil inside the outer cylinder 108 begins to enter the inner cylinder 109. As the top plate 104 continues to move downward, the outer cylinder 108 continuously transports the soil outside itself to the ground through the auger. At the same time, the soil inside the outer cylinder 108 continuously enters the inner cylinder 109. Until the outer cylinder 108 descends to the specified sampling depth, the second motor 105 and the first motor 105 are in operation. 02 stops working at the same time, the outer cylinder 108 stops rotating, and the staff rotates the second threaded rod 201. The second threaded rod 201 rotates through the threaded tube 202 to drive the sealing ring 110 to move downward. The sealing ring 110 moves downward to squeeze the air in the lower cavity of the inner cylinder 109 into the airbag 113, causing the airbag 113 to expand. Until the sealing ring 110 drops to the point where it connects with the uppermost airbag 113, the staff stops rotating the second threaded rod 201. At this time, the airbag 113 expands to the point where it can clamp the soil sample entering the inner cylinder 109.

[0036] After the soil sample is clamped, the first motor 102 is started again. The output shaft of the first motor 102 rotates and drives the top plate 104 through the first threaded rod 103, driving the components thereon and the clamped soil sample to move upward. Until the top plate 104 moves upward to the initial height, the first motor 102 stops working, and the soil sample of the specified depth is collected above the ground. At this time, the staff reverses the second threaded rod 201, and the threaded tube 202 drives the sealing ring 110 to move upward and reset, so that the air in the airbag 113 returns to the cavity at the lower part of the inner tube 109. During the upward movement of the sealing ring 110, the airbag 113 gradually shrinks until the sealing ring 110 moves upward and resets to the initial position. The airbag 113 no longer squeezes the soil sample entering the inner tube 109, making the collected soil sample easier to be taken out, thereby completing the soil sampling of the specified depth.

[0037] During the downward movement of the sealing ring 110, a small amount of air in the lower cavity of the inner cylinder 109 will leak out. When the sealing ring 110 moves upward and resets, the air squeezed into the airbag 113 will return to the cavity in the lower part of the inner cylinder 109. At the same time, the outside air will enter the air inlet pipe 303 in one direction through the air valve 304, and then enter the lower cavity of the inner cylinder 109 through the third connecting ring 302 and the connecting pipe 305. The air leakage in the lower cavity of the inner cylinder 109 creates an air pressure difference with the outside atmosphere, so that the outside air enters the lower cavity of the inner cylinder 109 through the third connecting ring 302, the air inlet pipe 303, the air valve 304 and the connecting pipe 305, thereby avoiding the failure of the airbag 113's clamping effect on the soil sample after multiple air leaks, thereby improving the reliability of the airbag 113 clamping the soil sample.

[0038] Example 2: Figure 7-Figure 9 As shown, it also includes a cutting assembly, which is arranged on the top plate 104 and is used to cut the collected soil column. The cutting assembly includes a rotating shaft 401, which is rotatably connected to the top plate 104. The lower end of the rotating shaft 401 is fixedly connected to a transmission gear 402. The side wall of the inner cylinder 109 is rotatably connected to a circumferentially distributed rotating rod 403. The lower end of the rotating rod 403 is fixedly connected to a sliding shell 404. The sliding shell 404 slides with the inner cylinder 109 and the outer cylinder 108. The sliding shell 404 is slidably connected to a scraper 405. The sliding shell 404 and the scraper 405 are both arc-shaped plates, and the center of the sliding shell 404 and the scraper 405 is consistent with the center of the inner cylinder 109. The upper end of the rotating rod 403 is fixedly connected to a pinion 406. The circumferentially distributed pinions 406 are all meshed with the transmission gear 402. The top plate 104 is provided with a power assembly for driving the transmission gear 402 to rotate.

[0039] like Figure 10 and Figure 11 As shown, the power assembly includes a third motor 501, the third motor 501 is fixed to the lower side of the top plate 104, the upper side of the inner cylinder 109 is fixed with a transmission gear ring 502, the circumferentially distributed rotating rods 403 are all rotatably connected to the transmission gear ring 502, the transmission gear ring 502 is slidably connected to the connecting pipe 305, the transmission gear ring 502 is rotatably connected to the second threaded rod 201, the output shaft of the third motor 501 is fixed with a gear, and the gear on the output shaft of the third motor 501 is rotatably connected to the transmission gear ring 502 Engagement, a bent rod 503 is fixed to the inner side of the transmission gear ring 502, and the bent rod 503 is slidably connected to the limit rod 504. The lower part of the limit rod 504 is fixed to the limit pin, and the upper side surface of the transmission gear 402 is fixed with a sleeve 505. The outer wall of the sleeve 505 is provided with an arc-shaped slide rail inclined along the outer wall. The limit pin at the lower part of the limit rod 504 slides with the slide rail provided on the outer wall of the sleeve 505, and the top plate 104 is provided with a trigger component for transmitting the limit rod 504 to move upward.

[0040] like Figure 10 and Figure 11 As shown, the trigger assembly includes an electric push rod 601, which is fixed to the lower side of the top plate 104. The telescopic end of the electric push rod 601 is fixed to a fourth connecting ring 602. The fourth connecting ring 602 is slidably connected to the limit rod 504, and a spring is arranged between the limit rod 504 and the bending rod 503.

[0041] When the outer cylinder 108 descends to the specified sampling depth, the staff starts the third motor 501. The third motor 501 rotates the transmission gear ring 502 through the gear on its output shaft. The transmission gear ring 502 drives the inner cylinder 109 and the curved rod 503 to rotate. The rotation of the inner cylinder 109 drives the rotating rod 403 to rotate circumferentially. The rotation of the curved rod 503 drives the sleeve 505 to rotate through the limit pin at the lower part of the limit rod 504. The rotation of the sleeve 505 drives the transmission gear 402 to rotate. Then the staff starts the electric push rod 601. The telescopic end of the electric push rod 601 drives the limit rod 504 to move upward along the slide groove on the curved rod 503 through the fourth connecting ring 602. During the upward movement of the limit rod 504, the limit pin at the lower part of the limit rod 504 slides through the slide rail on the outer wall of the sleeve 505, forcing the sleeve 505 and the transmission gear ring 502 to rotate relative to each other. The rotation of the sleeve 505 drives the transmission gear 402 to rotate, and the transmission gear 402 drives the transmission pinion 406 to rotate.

[0042] Taking the transmission of one of the pinions 406 as an example, the pinion 406 drives the rotating rod 403 to rotate, and the rotation of the rotating rod 403 drives the sliding shell 404 and the scraper 405 to rotate until the telescopic end of the electric push rod 601 moves to the uppermost end, and the electric push rod 601 stops moving. At this time, the end of the scraper 405 away from the sliding shell 404 rotates to the central axis of the inner cylinder 109.

[0043] During the process of the sliding shell 404 and the scraper 405 rotating toward the central axis of the inner cylinder 109 with the rotating rod 403 as the rotating axis 401, the rotating rod 403 also revolves around the central axis of the inner cylinder 109 as the rotating axis 401, so that the circumferentially distributed sliding shell 404 and scraper 405 cut the lower end of the soil sample collected in the inner cylinder 109 flat, so that the collected soil sample becomes a complete soil column. By utilizing the relative rotation between the sleeve 505 and the pinion 406, the circumferentially distributed sliding shell 404 and scraper 405 are driven to rotate and gather toward the central axis of the inner cylinder 109, cutting the collected soil sample into a complete soil column, ensuring the integrity of the collected soil sample, and avoiding the situation in which the lower part of the soil sample carries some deeper soil during the process of taking out the soil sample, resulting in deviation in the element detection results of the taken soil sample.

[0044] In the process of the circumferentially distributed sliding shells 404 and scrapers 405 converging toward the central axis of the inner cylinder 109, the cut soil samples are introduced into the space between the outer cylinder 108 and the inner cylinder 109 by the sliding shells 404 and scrapers 405, and the soil samples at a specified depth are transported to the collection shell at the upper end of the outer cylinder 108 by the auger on the inner cylinder 109 for collection, so that the elements of the soil samples at that depth can be detected separately, avoiding the need to remove the upper layer of soil when it is necessary to collect the soil at a specified depth.

[0045] After the soil sample at the specified depth is transported to the collection shell at the upper end of the outer cylinder 108, the electric push rod 601 is started again. The telescopic end of the electric push rod 601 drives the limit rod 504 to move downward along the slide groove on the bent rod 503 through the fourth connecting ring 602. During the downward movement of the limit rod 504, the limit pin at the lower part of the limit rod 504 slides through the slide rail on the outer wall of the sleeve 505, forcing the sleeve 505 and the pinion 406 to rotate in the opposite direction relative to each other, and the transmission pinion 406 rotates in the opposite direction. Taking the transmission of one of the pinion gears 406 as an example, the pinion 406 drives the sliding shell 404 and the scraper 405 to rotate away from the central axis of the inner cylinder 109 with the rotating rod 403 as the rotation axis 401 until the telescopic end of the electric push rod 601 moves to the lowest end, and the electric push rod 601 stops moving. At this time, the scraper 405 and the sliding shell 404 are reset. Then the staff turns off the third motor 501, completing the cutting of the soil sample and the separate collection of the soil sample at the specified depth.

[0046] When the sliding shell 404 and the scraper 405 cut the soil sample collected in the inner cylinder 109 , when encountering hard objects, the scraper 405 is squeezed into the sliding shell 404 by the hard objects, protecting the scraper 405 and extending the service life of the scraper 405 .

[0047] It should be understood that the above description is only for illustrative purposes and is not intended to limit the present invention. Those skilled in the art will appreciate that variations of the present invention will fall within the scope of the claims herein.

Claims

1. A positioning sampling device for soil element detection, characterized in that it includes: A support frame (101) is provided, the support frame (101) is fixedly connected to a symmetrically distributed first motor (102), the output shaft of the first motor (102) is fixedly connected to a first threaded rod (103) rotatably connected to the support frame (101), the symmetrically distributed first threaded rods (103) are commonly threadedly connected to a top plate (104), the lower side surface of the top plate (104) is fixedly connected to a second motor (105), the output shaft of the second motor (105) is fixedly connected to a gear, the lower side surface of the top plate (104) is slidably connected to a circumferentially distributed connecting plate (106), the circumferentially distributed connecting plates (106) are commonly fixedly connected to a gear ring (107), the gear on the output shaft of the second motor (105) meshes with the gear ring (107), the lower side surface of the circumferentially distributed connecting plates (106) The sides are fixedly connected to an outer cylinder (108), the upper side of the outer cylinder (108) is fixedly connected to a collecting shell, the inner part of the outer cylinder (108) is rotatably connected to an inner cylinder (109), the lower part of the inner cylinder (109) is provided with a cavity, a sealing ring (110) is slidably connected in the cavity at the lower part of the inner cylinder (109), the lower part of the inner side wall of the inner cylinder (109) is fixedly connected to first connecting rings (111) distributed axially at equal intervals, the inner side of the first connecting ring (111) is fixedly connected to a second connecting ring (112), airbags (113) are fixedly connected between adjacent first connecting rings (111), the airbags (113) distributed at equal intervals are all connected to the cavity at the lower part of the inner cylinder (109), and the inner cylinder (109) is provided with a clamping assembly for driving the sealing ring (110) to move downward; The outer wall of the inner cylinder (109) is provided with an auger that is rotatably matched with the outer cylinder (108); The invention also comprises a cutting assembly, which is arranged on the top plate (104) and is used for cutting the collected soil column. The cutting assembly comprises a rotating shaft (401), which is rotatably connected to the top plate (104). The lower end of the rotating shaft (401) is fixedly connected to a transmission gear (402). The side wall of the inner cylinder (109) is rotatably connected to a circumferentially distributed rotating rod (403). The lower end of the rotating rod (403) is fixedly connected to a sliding shell (404). The sliding shell (404) is slidably matched with the inner cylinder (109) and the outer cylinder (108). The sliding shell (404) is slidably connected to a scraper (405). The upper end of the rotating rod (403) is fixedly connected to a pinion (406). The circumferentially distributed pinions (406) are all meshed with the transmission gear (402). The top plate (104) is provided with a power assembly for driving the transmission gear (402) to rotate. The sliding shell (404) and the scraper (405) are both arc-shaped plates, and the centers of the sliding shell (404) and the scraper (405) are consistent with the center of the inner cylinder (109).

2. A positioning sampling device for soil element detection according to claim 1, characterized in that: A protection net is provided between adjacent second connection rings (112), and the protection net is used to protect the airbag (113).

3. A positioning sampling device for soil element detection according to claim 2, characterized in that: The clamping assembly comprises a second threaded rod (201), the second threaded rod (201) being rotatably connected to the inner cylinder (109), a threaded tube (202) being fixedly connected to the upper side of the sealing ring (110) and being slidably connected to the inner cylinder (109), the threaded tube (202) being threadedly connected to the second threaded rod (201), and the top plate (104) being provided with a pressure stabilizing assembly for stabilizing the air pressure in the lower cavity of the inner cylinder (109).

4. A positioning sampling device for soil element detection according to claim 3, characterized in that: The pressure stabilizing assembly comprises symmetrically distributed support rods (301), the symmetrically distributed support rods (301) are all fixedly connected to the lower side of the top plate (104), the symmetrically distributed support rods (301) are commonly fixedly connected to a third connecting ring (302), an annular cavity is arranged in the third connecting ring (302), an air intake pipe (303) connected to the annular cavity in the third connecting ring (302) is embedded in the top plate (104), a one-way air valve (304) is fixedly connected to the upper end of the air intake pipe (303), a connecting pipe (305) connected to the lower cavity of the inner cylinder (109) is connected to the lower side of the third connecting ring (302), and the inner cylinder (109) and the sealing ring (110) are both slidably connected to the connecting pipe (305).

5. A positioning sampling device for soil element detection according to claim 4, characterized in that: The power assembly comprises a third motor (501), the third motor (501) is fixedly connected to the lower side of the top plate (104), a transmission gear ring (502) is fixedly connected to the upper side of the inner cylinder (109), the circumferentially distributed rotating rods (403) are all rotationally connected to the transmission gear ring (502), the transmission gear ring (502) is slidably connected to the connecting pipe (305), the transmission gear ring (502) is rotationally connected to the second threaded rod (201), and the third motor (501) is The output shaft is fixedly connected to a gear, the gear on the output shaft of the third motor (501) meshes with the transmission gear ring (502), a bent rod (503) is fixedly connected to the inner side of the transmission gear ring (502), the bent rod (503) is slidably connected to a limit rod (504), the lower part of the limit rod (504) is fixedly connected to a limit pin, the upper side surface of the transmission gear (402) is fixedly connected to a sleeve (505), and the top plate (104) is provided with a trigger assembly for driving the limit rod (504) to move upward.

6. A positioning sampling device for soil element detection according to claim 5, characterized in that: The outer wall of the sleeve (505) is provided with an arc-shaped slide rail inclined along the outer wall, and the limit pin at the lower part of the limit rod (504) is slidably matched with the slide rail provided on the outer wall of the sleeve (505).

7. A positioning sampling device for soil element detection according to claim 6, characterized in that: The trigger assembly comprises an electric push rod (601), the electric push rod (601) is fixedly connected to the lower side of the top plate (104), the telescopic end of the electric push rod (601) is fixedly connected to a fourth connecting ring (602), the fourth connecting ring (602) is slidably connected to the limit rod (504), and a spring is provided between the limit rod (504) and the bending rod (503).

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