A soil sampling device for soil resistivity measurements

Abstract

The application belongs to the technical field of soil sampling, and particularly relates to a soil sampling device for soil resistivity measurement, which comprises an operation platform, a rotating seat and a sampling cylinder. A cutting part is arranged at the bottom of the sampling cylinder. A cooling cavity is arranged in the side wall of the cutting part. A heat exchange cavity is arranged in the side wall of the sampling cylinder. A group of drainage holes and flow guide holes are uniformly arranged between the cooling cavity and the heat exchange cavity. The cooling cavity, the heat exchange cavity, the drainage holes and the flow guide holes are filled with cooling liquid. A drainage assembly is arranged in the drainage holes. The cooling liquid between the cooling cavity and the heat exchange cavity is continuously exchanged by the drainage assembly, and the heat absorbed by the cooling liquid is diluted. Since the outer wall of the sampling cylinder directly contacts with the low-temperature frozen soil layer, the low-temperature soil can be used to cool the high-temperature cooling liquid entering the heat exchange cavity, and the low-temperature cooling liquid returning to the cooling cavity can continuously absorb the heat of the cutting part, so that the cooling efficiency of the cutting part is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of soil sampling, and in particular relates to a soil sampling device for soil resistivity measurement. BACKGROUND

[0002] Soil resistivity is an important parameter for studying the physical properties of soil and the relationship between soil and current conduction, and is widely used in the fields of soil science, environmental engineering, and power, communication, etc. Soil resistivity measurement usually relies on specific soil sampling devices, but existing soil sampling devices have certain limitations, especially for low-temperature frozen soil environment. It is particularly important to protect the original state of the frozen soil during sampling. Because the resistivity of solid water (i.e. ice) is extremely high, and after the dissolution of ions in liquid water, a conductive path is formed, therefore the resistivity of frozen soil is basically dominated by liquid water. From soil collection to resistivity measurement, it is necessary to pay attention to the fact that the initial content of liquid water in the frozen soil sample should be maintained as much as possible in order to fully improve the accuracy of resistivity measurement.

[0003] A patent of Chinese patent application CN113340646B discloses a soil sampling device for soil resistivity measurement. The technical solution points of the patent are as follows: the device includes a mounting shell, the inner wall of the mounting shell is fixedly connected with the outer surface of a rotating device, the bottom end of the rotating device is fixedly connected with the top end of a soil sampling rod, the bottom end of the soil sampling rod is fixedly connected with the upper surface of a retaining frame, the lower surface of the retaining frame is fixedly connected with a plurality of fixing frames, and the inner wall of a fastening nut is threadedly connected with the outer surface of a soil sampling tube. The device is not easy to generate high temperature due to friction with underground substances during operation, thereby reducing the change in the content of substances in the soil caused by the temperature rise of the punching cutter, reducing the possibility of high temperature moving along the soil sampling rod to the handle to scald the worker, and ensuring the accuracy of data during soil detection.

[0004] When the existing technology is used to sample frozen soil, the cutting tool or drill bit of the sampling device generates intense friction with the soil when it enters the soil, and the generated heat is easy to cause the ice crystals in the frozen soil to melt, resulting in an increase in the content of liquid water in the collected sample, which changes the original state of the frozen soil sample and will affect the measurement of resistivity. Therefore, the above-mentioned technology of water-cooling the cutting tool or drill bit is used to reduce the heat transfer to the frozen soil. However, the cooling liquid in the above-mentioned technology is in a non-flowing state inside the cutting tool, and the cooling effect of the cutting tool is poor. With the continuous rotation of the cutting tool and the generation of heat by friction with the soil, the cooling liquid inside the cutting tool will also be heated to a certain temperature, so the temperature control effect will gradually be lost, and the frozen soil sample still has the risk of warming up and melting.

[0005] Therefore, the application provides a soil sampling device for soil resistivity measurement. SUMMARY

[0006] To make up for the deficiencies of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical scheme adopted by the present application to solve its technical problems is: a soil sampling device for soil resistivity measurement, comprising an operation platform, a rotating seat and a sampling cylinder;

[0008] The operation platform is fixedly connected on one side with a group of handrails; the bottom of the operation platform is rotatably connected with a rotating seat; the lower side of the rotating seat is fixedly connected with a sampling cylinder through a group of connecting rods; and the bottom of the sampling cylinder is provided with a cutting part;

[0009] The inner wall of the cutting part is provided with a cooling cavity; the inner wall of the sampling cylinder is provided with a heat exchange cavity; a group of drainage holes and flow guide holes are evenly distributed between the cooling cavity and the heat exchange cavity, and the drainage holes and the flow guide holes are arranged alternately; and the cooling cavity, the heat exchange cavity, the drainage holes and the flow guide holes are all filled with cooling liquid;

[0010] The inner part of the drainage hole is provided with a drainage assembly; and the drainage assembly is used for exchanging the cooling liquid in the cooling cavity and the heat exchange cavity.

[0011] Preferably, the upper side of the rotating seat is provided with a connecting sleeve; the top of the connecting sleeve is fixedly connected with a gear ring; the surface of the operation platform is fixedly connected with a motor; and the motor and the gear ring are connected through a gear transmission.

[0012] Preferably, the top of the sampling cylinder is communicated with a storage cylinder; the upper end of the storage cylinder is fixedly connected with a handle; the bottom of the storage cylinder is provided with a sealing cover; and the storage cylinder and the sampling cylinder, and the storage cylinder and the sealing cover are all connected through threads.

[0013] Preferably, the inner wall surface of the storage cylinder is fixedly connected with a temperature sensor; the storage cylinder is designed as a double-layer hollow structure; the top of the storage cylinder is provided with an MCU and a semiconductor refrigeration sheet; and the refrigeration surface of the semiconductor refrigeration sheet is located inside the hollow structure of the storage cylinder.

[0014] Preferably, the top of the storage cylinder is slidably connected with a boosting plate; the storage cylinder and the boosting plate are fixedly connected with a tension spring; and the top of the storage cylinder is provided with an operation port.

[0015] Preferably, the drainage assembly comprises a telescopic part and a guide block; the telescopic part is composed of a fixed sleeve and a telescopic core rod; the guide block is fixedly connected to the lower end of the telescopic core rod, and the guide block is slidably matched with the drainage hole; the guide block is provided with a guide hole in the inside; and the lower side of the guide block is fixedly connected with an inclined elastic lobe.

[0016] Preferably, the rotating seat is internally provided with an annular groove; the annular groove is internally and slidingly and sealingly fitted with an annular plate; the annular plate is uniformly provided on the upper side with a group of magnetic blocks; the annular plate is fixedly connected between the lower side and the annular groove with a compression spring; the operation platform is uniformly provided with a group of magnetic columns; the bottom of the annular groove and the fixed sleeve are respectively communicated through air tubes.

[0017] Preferably, the outer layer of the heat exchange cavity is made of heat-conducting material, and the inner layer of the heat exchange cavity is made of heat-insulating material.

[0018] Preferably, the inner wall surface of the cooling cavity is hingedly provided with a turbulence vane; the turbulence vane and the inner wall of the cooling cavity are fixedly connected with an elastic member; the guide block and the turbulence vane are fixedly connected with a connecting main rope.

[0019] Preferably, the turbulence vane and the elastic member are each provided with a group; adjacent turbulence vanes are fixedly connected with a connecting sub rope.

[0020] The beneficial effects of the present application are as follows:

[0021] 1. The soil sampling device for soil resistivity measurement, through the drainage assembly in the drainage hole, the cooling liquid between the cooling cavity and the heat exchange cavity is continuously exchanged through the drainage hole and the flow guide hole, the heat absorbed by the cooling liquid is diluted, the temperature of the cooling liquid when contacting the cutting part is reduced, and after the high-temperature cooling liquid enters the heat exchange cavity from the cooling cavity, the outer wall of the sampling cylinder directly contacts the low-temperature frozen soil layer outside, so that the low-temperature soil can cool the high-temperature cooling liquid entering the heat exchange cavity, and the low-temperature cooling liquid returning to the cooling cavity continues to absorb the heat of the cutting part, forming a circulating heat exchange process of heat absorption and heat release, so as to improve the cooling efficiency of the cutting part.

[0022] 2. The soil sampling device for soil resistivity measurement, during the sampling process, as the sampling cylinder continuously drills into the soil layer, the soil in the sampling cylinder can enter the storage cylinder through the bottom opening of the storage cylinder to store the sample, then the worker inserts his hand into the connecting sleeve and between the connecting rods, rotates the storage cylinder by the handle and takes it off, and screws the sealing cover on the bottom, uses the storage cylinder as a temporary storage and transportation container for the frozen soil sample, and sends the sample to the laboratory for measuring the resistivity, which can improve the transfer efficiency.

[0023] 3. The soil sampling device for soil resistivity measurement, when the frozen soil begins to enter the inside of the storage cylinder, the initial temperature of the soil is detected by the temperature sensor, the temperature corresponds to the natural original state of the frozen soil, the MCU records the initial temperature, in the subsequent storage and transportation process, if the temperature sensor detects that the temperature change in the inside of the storage cylinder reaches a certain threshold value, then the MCU controls the semiconductor refrigeration piece to start working, reduces the air temperature in the hollow structure of the storage cylinder, insulates the temperature inside and outside the storage cylinder by low-temperature air, and cools the soil sample in the storage cylinder until the data detected by the temperature sensor tends to the initial temperature, restores the original moisture content and other natural states of the soil, and improves the authenticity of the resistivity measurement. BRIEF DESCRIPTION OF DRAWINGS

[0024] The application will be further described below in conjunction with the drawings.

[0025] Figure 1 is a perspective view of the application;

[0026] Figure 2 is Figure 1 is a partial enlarged view of A in FIG. 1;

[0027] Figure 3 is a structural schematic view of the rotating seat and the sampling cylinder in the application;

[0028] Figure 4 is a structural schematic view of the sampling cylinder in the application;

[0029] Figure 5 is a structural schematic view of the storage cylinder in the application;

[0030] Figure 6 is a sectional view of the application;

[0031] Figure 7 is Figure 6 is a partial enlarged view of B in FIG. 2;

[0032] Figure 8 is Figure 6 is a partial enlarged view of C in FIG. 3;

[0033] Figure 9 is Figure 6 is a partial enlarged view of D in FIG. 4.

[0034] In the diagram: 1. Operating platform; 2. Rotating seat; 3. Sampling cylinder; 4. Handrail; 5. Connecting rod; 6. Cutting section; 7. Cooling chamber; 8. Heat exchange chamber; 9. Drainage hole; 10. Guide hole; 11. Connecting sleeve; 12. Gear ring; 13. Motor; 14. Gear; 15. Storage cylinder; 16. Handle; 17. Sealing cover; 18. Temperature sensor; 19. Semiconductor cooling chip; 20. Push plate; 21. Tension spring; 22. Operating port; 23. Guide block; 24. Fixed sleeve; 25. Telescopic core rod; 26. Guide hole; 27. Elastic flap; 28. Annular groove; 29. ​​Annular plate; 30. Magnetic block; 31. Compression spring; 32. Magnetic column; 33. Air pipe; 34. Thermal conductive material; 35. Thermal insulation material; 36. Baffle plate; 37. Elastic element; 38. Connecting main rope; 39. Connecting sub-rope. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0036] like Figures 1 to 9 As shown, the soil sampling device for measuring soil resistivity according to the present invention includes an operating platform 1, a rotating base 2, and a sampling cylinder 3;

[0037] A set of handrails 4 are fixedly connected to the side of the operating platform 1; a rotating seat 2 is rotatably connected to the bottom of the operating platform 1; a sampling cylinder 3 is fixedly connected to the lower side of the rotating seat 2 through a set of connecting rods 5; a cutting part 6 is provided at the bottom of the sampling cylinder 3.

[0038] A cooling chamber 7 is provided inside the side wall of the cutting section 6; a heat exchange chamber 8 is provided inside the side wall of the sampling cylinder 3; a set of drainage holes 9 and guide holes 10 are evenly distributed between the cooling chamber 7 and the heat exchange chamber 8, and the drainage holes 9 and guide holes 10 are arranged alternately; the cooling chamber 7, the heat exchange chamber 8, the drainage holes 9 and the guide holes 10 are all filled with coolant;

[0039] The drainage hole 9 is equipped with a drainage component; the drainage component is used to exchange the coolant inside the cooling chamber 7 and the heat exchange chamber 8.

[0040] In existing technologies, when sampling permafrost, the cutting blades or drill bits of the sampling device experience intense friction with the soil upon entering, generating heat that can easily melt ice crystals in the permafrost. This leads to an increase in the liquid water content in the collected samples, altering the original state of the permafrost sample and affecting resistivity measurements. Therefore, a technology has been developed to cool the cutting blades or drill bits with water to reduce heat transfer to the permafrost. However, the coolant in this technology remains stagnant inside the cutting blade, resulting in poor cooling. As the blade continues to rotate and rubs against the soil, generating heat, the coolant inside is also heated to a certain temperature, thus gradually losing its temperature control effect. The permafrost sample still faces the risk of heating up and melting.

[0041] When collecting frozen soil samples, the operating platform 1 is held by the handrail 4, the sampling cylinder 3 is aligned with the soil layer, the rotating seat 2 is controlled to drive the sampling cylinder 3 to rotate through the connecting rods 5, the cutting part 6 of the sampling cylinder 3 is rotated into the soil layer, the soil is caused to enter the inside of the sampling cylinder 3, the cooling liquid in the cooling cavity 7 can absorb the friction heat generated by the cutting part 6, and as the sampling cylinder 3 continuously enters the inside of the soil, the temperature of the cooling liquid in the cooling cavity 7 will also gradually rise, the cooling liquid between the cooling cavity 7 and the heat exchange cavity 8 is caused to continuously exchange through the drainage assembly in the drainage hole 9 and the flow guide hole 10, the heat absorbed by the cooling liquid is diluted, the temperature of the cooling liquid when contacting the cutting part 6 is reduced, and after the high-temperature cooling liquid enters the heat exchange cavity 8 from the cooling cavity 7, since the outer wall of the sampling cylinder 3 is directly contacted with the low-temperature frozen soil layer outside, the low-temperature soil can be used to cool the high-temperature cooling liquid entering the heat exchange cavity 8, and when the low-temperature cooling liquid returns to the cooling cavity 7 again, the heat absorption and heat release cycle heat exchange process is formed, so that the cooling efficiency of the cutting part 6 is improved, and the cutting part 6 is kept within a certain temperature during the whole sampling process, which can improve the cutting efficiency of the cutting part 6 and prevent the cutting tool from being damaged, and on the other hand, the frozen soil can be prevented from being melted by the high-temperature cutting part 6, so that the sampling quality of the soil sample is ensured.

[0042] The operating platform 1 and the rotating seat 2 are designed in a ring shape, and the plurality of connecting rods 5 are arranged in a ring array; the upper side of the rotating seat 2 is provided with a connecting sleeve 11; the top of the connecting sleeve 11 is fixedly connected with a gear ring 12; the surface of the operating platform 1 is fixedly connected with a motor 13; and the motor 13 and the gear ring 12 are drivingly connected through a gear 14. The motor 13 drives the rotating seat 2 to rotate through the gear 14, the gear ring 12 and the connecting sleeve 11, so as to control the sampling cylinder 3 to rotate into the soil, and in the sampling process, the rotating speed of the sampling cylinder 3 should not be too fast, so as to reduce the friction between the cutting part 6 and the soil and reduce the heat generation.

[0043] As another embodiment of the present application, the sampling cylinder 3 is communicated with a storage cylinder 15 at the top; the upper end of the storage cylinder 15 is fixedly connected with a handle 16; the bottom of the storage cylinder 15 is provided with a sealing cover 17; and the storage cylinder 15 and the sampling cylinder 3 and the storage cylinder 15 and the sealing cover 17 are connected through threads. During the sampling process, as the sampling cylinder 3 continuously drills into the soil layer, the soil in the sampling cylinder 3 can enter the storage cylinder 15 through the bottom opening of the storage cylinder 15, so as to save the sample, then the staff member puts his hand into the connecting sleeve 11 and between the plurality of connecting rods 5, rotates the storage cylinder 15 through the handle 16 and takes it off, and screws the sealing cover 17 at the bottom, so as to use the storage cylinder 15 as a temporary storage and transportation container for the frozen soil sample, and send the sample to the laboratory for measuring the resistivity, so as to improve the transfer efficiency.

[0044] The inner wall surface of the storage cylinder 15 is fixedly connected with a temperature sensor 18; the storage cylinder 15 is designed as a double-layer hollow structure; the top of the storage cylinder 15 is provided with an MCU and a semiconductor refrigeration sheet 19; and the refrigeration surface of the semiconductor refrigeration sheet 19 is located inside the hollow structure of the storage cylinder 15.

[0045] When the frozen soil begins to enter the inside of the storage cylinder 15, the initial temperature of the soil is detected by the temperature sensor 18, which corresponds to the natural original state of the frozen soil, and the initial temperature is recorded by the MCU; in the subsequent preservation and transportation process, if the temperature sensor 18 detects that the temperature change in the inside of the storage cylinder 15 reaches a certain threshold value, then the MCU controls the semiconductor refrigeration sheet 19 to start working, reduces the air temperature in the inside of the hollow structure of the storage cylinder 15, insulates the temperature inside and outside the storage cylinder 15 by using low-temperature air, and cools the soil sample in the storage cylinder 15 until the data detected by the temperature sensor 18 tends to the initial temperature, so as to restore the original moisture content and other natural states of the soil and improve the authenticity of the resistivity measurement.

[0046] As another embodiment of the present application, a boost plate 20 is slidably connected to the top of the storage cylinder 15; a tension spring 21 is fixedly connected between the boost plate 20 and the storage cylinder 15; and an operation port 22 is formed in the top of the storage cylinder 15. When the soil in the inside of the storage cylinder 15 is taken out, an external rod-shaped tool can be used, the tool is inserted into the inside of the storage cylinder 15 through the operation port 22, the boost plate 20 is pressed from above to make it move downward and take out the soil sample, thereby reducing the difficulty of taking out the sample.

[0047] As another embodiment of the present application, the drainage assembly comprises a telescopic piece and a guide block 23; the telescopic piece is composed of a fixed sleeve 24 and a telescopic core rod 25, the fixed sleeve 24 is in a fixed state, and the telescopic core rod 25 is slidably and sealingly fitted in the inside of the fixed sleeve 24; the guide block 23 is fixedly connected to the lower end of the telescopic core rod 25 and slidably fitted with the drainage hole 9; a guide hole 26 is formed in the inside of the guide block 23; and an inclined elastic flap 27 is fixedly connected to the lower side of the guide block 23 at a position corresponding to the guide hole 26.

[0048] An annular groove 28 is formed in the inside of the rotating seat 2; an annular plate 29 is slidably and sealingly fitted in the inside of the annular groove 28; a group of magnetic blocks 30 is uniformly distributed on the upper side of the annular plate 29; a compression spring 31 is fixedly connected between the lower side of the annular plate 29 and the annular groove 28; a group of magnetic columns 32 is uniformly distributed in the inside of the operation platform 1 at a position corresponding to the annular groove 28; the magnetic columns 32 and the magnetic blocks 30 repel each other when they are close to each other; the bottom of the annular groove 28 and the fixed sleeve 24 are respectively communicated through air pipes 33, and the air pipes 33 respectively pass through the inside of the connecting rod 5.

[0049] The specific working process of the drainage assembly is as follows: as the rotating seat 2 continues to rotate, when the magnetic block 30 moves to be aligned with the magnetic column 32, the magnetic thrust between the magnetic column 32 and the magnetic block 30 drives the annular plate 29 to move downward, the annular plate 29 extrudes the air at the bottom of the annular groove 28 into the plurality of fixed sleeves 24 through the air pipes 33, respectively, so that the telescopic core rod 25 extends downward and drives the guide block 23 to move downward, when the magnetic block 30 is misaligned with the magnetic column 32, the compression spring 31 pushes the annular plate 29 to reset upward, at this time, the air at the bottom of the annular groove 28 is sucked back, and the telescopic core rod 25 drives the guide block 23 to reset upward; by controlling the guide block 23 to periodically reciprocate in the drainage hole 9, when the guide block 23 moves downward, the elastic flap 27 deforms upward under the resistance of the cooling liquid, adheres to the surface of the guide block 23 and blocks the guide hole 26, at this time, the cooling liquid cannot flow through the guide hole 26, and the guide block 23 can push the cooling liquid below to the cooling cavity 7, and part of the cooling liquid in the cooling cavity 7 flows upward to the heat exchange cavity 8 through the flow guide hole 10, when the guide block 23 moves upward, the elastic flap 27 deflects downward again and opens the guide hole 26, at this time, the cooling liquid above the guide block 23 can flow downward through the guide hole 26, and the intermittent opening and closing of the guide hole 26 can realize the one-way downward drainage of the drainage hole 9 and the one-way upward flow of the flow guide hole 10, thereby improving the exchange efficiency of the cooling liquid in the cooling cavity 7 and the heat exchange cavity 8.

[0050] As another embodiment of the present application, the outer layer of the heat exchange cavity 8 is made of a heat-conducting material 34, such as alumina ceramic, copper, etc., and the inner layer of the heat exchange cavity 8 is made of a heat-insulating material 35, such as polystyrene, calcium silicate board, etc. When the cooling liquid in the cooling cavity 7 enters the heat exchange cavity 8, it can quickly exchange heat with the frozen soil outside the sampling cylinder 3 through the heat-conducting material 34 of the outer layer, and the heat-insulating material 35 of the inner layer can prevent heat from being transmitted to the obtained soil sample.

[0051] As another embodiment of the present application, the inner wall surface of the cooling cavity 7 is hinged with a spoiler 36; the spoiler 36 and the inner wall of the cooling cavity 7 are fixedly connected with an elastic member 37; the guide block 23 and the spoiler 36 are fixedly connected with a connecting main rope 38.

[0052] The spoiler 36 and the elastic member 37 are both provided with a group; the adjacent spoilers 36 are fixedly connected with a connecting sub-rope 39.

[0053] When the guide block 23 moves upward, the plurality of spoilers 36 are deflected upward by the connecting main rope 38 and the connecting sub rope 39, and when the guide hole 26 moves downward, the connecting main rope 38 is loosened, and the elastic member 37 drives the plurality of spoilers 36 to deflect downward, the cooling liquid in the cooling cavity 7 is stirred and disturbed by the continuous up-and-down swinging of the spoilers 36, the heat distribution uniformity of the cooling liquid is improved, and the cooling liquid and the cutting part 6 can be fully heat exchanged, and the temperature control effect of the cutting part 6 is enhanced.

[0054] The above front, rear, left, right, up and down are based on the drawings of the specification Figure 1 As a standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and the like.

[0055] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the scope of protection of the present application.

[0056] The basic principles, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application, and various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A soil sampling device for soil resistivity measurement, comprising an operating platform (1), a rotating seat (2) and a sampling cylinder (3); The operating platform (1) is fixedly connected with a group of handrails (4) on the side; the bottom of the operating platform (1) is rotatably connected with the rotating seat (2); the lower side of the rotating seat (2) is fixedly connected with the sampling cylinder (3) through a group of connecting rods (5); the bottom of the sampling cylinder (3) is provided with a cutting part (6); characterized in that The cutting part (6) is provided with a cooling cavity (7) in the inner wall of the side; the sampling cylinder (3) is provided with a heat exchange cavity (8) in the inner wall of the side; a group of drainage holes (9) and flow guide holes (10) are evenly distributed between the cooling cavity (7) and the heat exchange cavity (8); the cooling cavity (7), the heat exchange cavity (8), the drainage holes (9) and the flow guide holes (10) are filled with cooling liquid; The drainage holes (9) are provided with a drainage assembly; the drainage assembly is used to exchange the cooling liquid in the cooling cavity (7) and the heat exchange cavity (8).

2. The soil sampling device for soil resistivity measurement according to claim 1, characterized in that: The upper side of the rotating seat (2) is provided with a connecting sleeve (11); the top of the connecting sleeve (11) is fixedly connected with a gear ring (12); the surface of the operating platform (1) is fixedly connected with a motor (13); the motor (13) and the gear ring (12) are drivingly connected through a gear (14).

3. A soil sampling device for soil resistivity measurements according to claim 2, characterized in that: The top of the sampling cylinder (3) is communicated with a storage cylinder (15); the upper end of the storage cylinder (15) is fixedly connected with a handle (16); the bottom of the storage cylinder (15) is provided with a sealing cover (17); the storage cylinder (15) and the sampling cylinder (3), the storage cylinder (15) and the sealing cover (17) are connected through threads.

4. The soil sampling device for soil resistivity measurements of claim 3, wherein: The inner wall surface of the storage cylinder (15) is fixedly connected with a temperature sensor (18); the storage cylinder (15) is designed as a double-layer hollow structure; the top of the storage cylinder (15) is provided with an MCU and a semiconductor refrigeration sheet (19); the refrigeration surface of the semiconductor refrigeration sheet (19) is located in the hollow structure of the storage cylinder (15).

5. The soil sampling device for soil resistivity measurement according to claim 3, characterized in that: The top of the storage cylinder (15) is slidably connected with a boost plate (20); the boost plate (20) and the storage cylinder (15) are fixedly connected with a tension spring (21); the top of the storage cylinder (15) is provided with an operating port (22).

6. The soil sampling device for soil resistivity measurement according to claim 1, characterized in that: The drainage assembly comprises a telescopic member and a guide block (23); the telescopic member is composed of a fixed sleeve (24) and a telescopic core rod (25); the guide block (23) is fixedly connected to the lower end of the telescopic core rod (25), and the guide block (23) is slidably connected with the drainage hole (9); the guide block (23) is provided with a guide hole (26) in the inner wall; the lower side of the guide block (23) is fixedly connected with an inclined elastic lobe (27).

7. A soil sampling device for soil resistivity measurements according to claim 6, characterized in that: The rotating seat (2) is internally provided with an annular groove (28); the annular groove (28) is internally slidably and sealingly matched with an annular plate (29); the annular plate (29) is uniformly provided on the upper side with a group of magnetic blocks (30); the annular plate (29) is fixedly connected with the compression spring (31) between the lower side and the annular groove (28); the operating platform (1) is uniformly provided on the inside with a group of magnetic columns (32); the bottom of the annular groove (28) and the fixed sleeve (24) are respectively communicated through the air pipe (33).

8. The soil sampling device for soil resistivity measurement according to claim 1, characterized in that: The outer layer of the heat exchange cavity (8) is made of heat-conducting material (34), and the inner layer of the heat exchange cavity (8) is made of heat-insulating material (35).

9. The soil sampling device for soil resistivity measurements of claim 7, wherein: The inner wall surface of the cooling cavity (7) is hingedly connected with a spoiler (36); the spoiler (36) and the inner wall of the cooling cavity (7) are fixedly connected with an elastic member (37); the guide block (23) and the spoiler (36) are fixedly connected with a connecting main rope (38).

10. A soil sampling device for soil resistivity measurements according to claim 9, characterized in that: The spoiler (36) and the elastic member (37) are both provided with a group; the adjacent spoilers (36) are fixedly connected with a connecting sub-rope (39).

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