Soil sampling device for measuring soil resistivity

Abstract

The invention 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 barrel, a cutting part is arranged at the bottom of the sampling barrel; a cooling cavity is formed in the side wall of the cutting part; a heat exchange cavity is formed in the side wall of the sampling barrel; a group of drainage holes and diversion holes are uniformly distributed 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 all filled with cooling liquid. A drainage assembly is arranged in the drainage hole; cooling liquid between the cooling cavity and the heat exchange cavity is promoted to be continuously exchanged through the drainage assembly, heat absorbed by the cooling liquid is diluted, and due to the fact that the outer wall of the sampling barrel is in direct contact with an external low-temperature frozen soil layer, high-temperature cooling liquid entering the heat exchange cavity can be cooled through low-temperature soil; and when the formed low-temperature cooling liquid returns to the cooling cavity again, the heat of the cutting part is continuously absorbed, so that the cooling efficiency of the cutting part is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of soil sampling, in particular to a soil sampling device for measuring soil resistivity. Background Art

[0002] Soil resistivity is an important parameter for studying soil physical properties and the relationship between soil and current conduction. It is widely used in fields such as soil science, environmental engineering, electricity, and communications. Soil resistivity measurements typically rely on specific soil sampling devices, but existing soil sampling devices have certain limitations. Preserving the pristine state of frozen soil during sampling is particularly important, especially in low-temperature permafrost environments. Because solid water (i.e., ice) has an extremely high resistivity, and liquid water dissolves ions to form a conductive path, the resistivity of frozen soil is largely dominated by liquid water. From soil collection to resistivity measurement, care should be taken to maintain the initial liquid water content in the frozen soil sample to maximize resistivity measurement accuracy.

[0003] Chinese patent application CN113340646B discloses a soil sampling device for measuring soil resistivity. The key technical features of the device are: a mounting housing, the inner wall of which is fixedly connected to the outer surface of a rotating device; the bottom end of the rotating device is fixedly connected to the top of a soil sampling rod; the bottom end of the soil sampling rod is fixedly connected to the upper surface of a retaining frame; the lower surface of the retaining frame is fixedly connected to a plurality of retaining frames; and the inner wall of the fastening nut is threadedly connected to the outer surface of the soil sampling tube. By providing a handle, a conical block, a punch cutter, and a water trough, the device is less susceptible to high temperatures generated by friction with underground materials during operation. This reduces the possibility of changes in soil material content caused by the increased temperature of the punch cutter and the possibility of excessive heat from the punch cutter traveling along the soil sampling rod to the handle, potentially scalding personnel. This also ensures the accuracy of data collected during soil testing.

[0004] In the existing technology, when sampling frozen soil, the cutting tool or drill bit of the sampling device will generate violent friction with the soil when entering the soil. The heat generated can easily cause the ice crystals in the frozen soil to melt, resulting in an increase in the liquid water content in the collected sample, changing the original state of the frozen soil sample, and affecting the resistivity measurement. Therefore, the above-mentioned technology of water cooling the cutting tool or drill bit has emerged to reduce the heat transfer to the frozen soil. However, the coolant of the above-mentioned technology is in a non-flowing state inside the cutting tool, and the cooling effect on the tool is poor. As the tool continues to rotate and generates heat due to friction with the soil, the coolant inside it will also be heated to a certain temperature. Therefore, the temperature control effect will gradually be lost, and the frozen soil sample will still be at risk of heating up and melting.

[0005] To this end, the present invention provides a soil sampling device for measuring soil resistivity. Summary of the Invention

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

[0007] The technical solution adopted by the present invention to solve the technical problem is as follows: a soil sampling device for measuring soil resistivity of the present invention comprises an operating platform, a rotating seat and a sampling tube; A set of handrails are fixedly connected to the side of the operating platform; a rotating seat is rotatably connected to the bottom of the operating platform; a sampling cylinder is fixedly connected to the lower side of the rotating seat through a set of connecting rods; a cutting portion is provided at the bottom of the sampling cylinder; A cooling chamber is provided inside the side wall of the cutting portion; a heat exchange chamber is provided inside the side wall of the sampling tube; a group of drainage holes and flow guide holes are distributed between the cooling chamber and the heat exchange chamber, and the drainage holes and the flow guide holes are arranged alternately; the cooling chamber, the heat exchange chamber, the drainage holes and the flow guide holes are all filled with coolant; A drainage component is provided inside the drainage hole; the drainage component is used to exchange the cooling liquid inside the cooling cavity and the heat exchange cavity.

[0008] Preferably, a connecting sleeve is provided on the upper side of the rotating seat; a gear ring is fixedly connected to the top of the connecting sleeve; a motor is fixedly connected to the surface of the operating platform; and the motor and the gear ring are connected via a gear transmission.

[0009] Preferably, the top of the sampling cylinder is connected to a storage cylinder; a handle is fixedly connected to the upper end of the storage cylinder; a sealing cover is provided at the bottom of the storage cylinder; and the storage cylinder and the sampling cylinder, as well as the storage cylinder and the sealing cover are all connected by threads.

[0010] Preferably, a temperature sensor is fixedly connected to the inner wall surface of the storage cylinder; the storage cylinder is designed as a double-layer hollow structure; an MCU and a semiconductor refrigeration plate are provided on the top of the storage cylinder; and the cooling surface of the semiconductor refrigeration plate is located inside the hollow structure of the storage cylinder.

[0011] Preferably, a boost plate is slidably connected to the top of the storage cylinder; a tension spring is fixedly connected between the boost plate and the storage cylinder; and an operation port is opened at the top of the storage cylinder.

[0012] Preferably, the drainage assembly includes 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 slides with the drainage hole; a guide hole is opened inside the guide block; an inclined elastic flap is fixedly connected to the lower side of the guide block.

[0013] Preferably, an annular groove is provided inside the rotating seat; an annular plate is provided for sliding sealing inside the annular groove; a group of magnetic blocks are evenly distributed on the upper side of the annular plate; a compression spring is fixedly connected between the lower side of the annular plate and the annular groove; a group of magnetic columns are evenly distributed inside the operating platform; the bottom of the annular groove and the fixed sleeve are connected through air pipes.

[0014] Preferably, the outer layer of the heat exchange cavity is a heat conductive material, and the inner layer of the heat exchange cavity is a heat insulating material.

[0015] Preferably, a spoiler is hinged on the inner wall surface of the cooling chamber; an elastic member is fixedly connected between the spoiler and the inner wall of the cooling chamber; and a connecting main rope is fixedly connected between the guide block and the spoiler.

[0016] Preferably, the spoilers and the elastic members are each provided in a group; and connecting sub-ropes are fixedly connected between adjacent spoilers.

[0017] The beneficial effects of the present invention are as follows: 1. The soil sampling device for measuring soil resistivity described in the present invention promotes the continuous exchange of coolant between the cooling chamber and the heat exchange chamber through the drainage assembly inside the drainage hole, dilutes the heat absorbed by the coolant, and reduces the temperature of the coolant when it contacts the cutting part. Moreover, after the high-temperature coolant enters the heat exchange chamber from the cooling chamber, the outer wall of the sampling tube is in direct contact with the external low-temperature frozen soil layer. Therefore, the low-temperature soil can be used to cool the high-temperature coolant entering the heat exchange chamber. When the formed low-temperature coolant returns to the cooling chamber again, it continues to absorb the heat of the cutting part, forming a cyclic heat exchange process of heat absorption and heat release, thereby improving the cooling efficiency of the cutting part.

[0018] 2. The present invention provides a soil sampling device for measuring soil resistivity. During the sampling process, as the sampling tube continues to drill into the soil layer, the soil in the sampling tube can enter the storage tube through the bottom opening to preserve the sample. The staff then reaches into the connecting sleeve and between multiple connecting rods, rotates the storage tube by the handle and removes it, and screws the sealing cover on its bottom. The storage tube is used as a temporary storage and transportation container for frozen soil samples, and the samples are sent to the laboratory for resistivity measurement, which can improve transfer efficiency.

[0019] 3. The soil sampling device for measuring soil resistivity described in the present invention uses a temperature sensor to detect the initial temperature of the soil when frozen soil begins to enter the interior of the storage tube. The soil state corresponding to this temperature is the natural original state of the frozen soil. The initial temperature is recorded by an MCU. During subsequent storage and transportation, if the temperature sensor detects that the temperature change inside the storage tube reaches a certain threshold, the MCU controls the semiconductor refrigeration plate to start working, lowering the air temperature inside the hollow structure of the storage tube, using the low-temperature air to isolate the temperature inside and outside the storage tube, and cooling the soil sample in the storage tube until the data detected by the temperature sensor approaches the initial temperature, thereby restoring the original natural state of the soil, such as the moisture content, and improving the authenticity of the resistivity measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] Figure 1 is a perspective view of the present invention; Figure 2 yes Figure 1 A partial enlarged view of the middle part; Figure 3 It is a structural schematic diagram of the rotating seat and the sampling tube in the present invention; Figure 4 It is a structural schematic diagram of the sampling tube in the present invention; Figure 5 It is a structural schematic diagram of the storage cylinder in the present invention; Figure 6 is a cross-sectional view of the present invention; Figure 7 yes Figure 6 A partial enlarged view of point B in the middle; Figure 8 yes Figure 6 A partial enlarged view of point C in the middle; Figure 9 yes Figure 6 A partial enlarged view of point D in the middle.

[0022] In the figure: operating platform 1, rotating seat 2, sampling tube 3, handrail 4, connecting rod 5, cutting part 6, cooling chamber 7, heat exchange chamber 8, drainage hole 9, diversion hole 10, connecting sleeve 11, ring gear 12, motor 13, gear 14, storage tube 15, handle 16, sealing cover 17, temperature sensor 18, semiconductor refrigeration plate 19, booster plate 20, tension spring 21, operating port 22, guide block 23, fixed sleeve 24, telescopic core rod 25, guide hole 26, elastic petal 27, annular groove 28, annular plate 29, magnetic block 30, compression spring 31, magnetic column 32, air pipe 33, heat conducting material 34, heat insulating material 35, spoiler 36, elastic member 37, connecting main rope 38, connecting sub-rope 39. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0024] like Figures 1 to 9 As shown, a soil sampling device for measuring soil resistivity according to the present invention comprises an operating platform 1, a rotating base 2 and a sampling tube 3; The side of the operating platform 1 is fixedly connected to a set of handrails 4; the bottom of the operating platform 1 is rotatably connected to a rotating base 2; the lower side of the rotating base 2 is fixedly connected to a sampling cylinder 3 through a set of connecting rods 5; the bottom of the sampling cylinder 3 is provided with a cutting portion 6; A cooling chamber 7 is provided inside the side wall of the cutting portion 6; a heat exchange chamber 8 is provided inside the side wall of the sampling tube 3; a group 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 the guide holes 10 are arranged in a staggered manner; the cooling chamber 7, the heat exchange chamber 8, the drainage holes 9 and the guide holes 10 are all filled with coolant; A drainage component is provided inside the drainage hole 9 ; the drainage component is used to exchange the coolant inside the cooling chamber 7 and the heat exchange chamber 8 .

[0025] In the existing technology, when sampling frozen soil, the cutting tool or drill bit of the sampling device rubs violently with the soil when entering the soil. The heat generated can easily cause the ice crystals in the frozen soil to melt, resulting in an increase in the liquid water content in the collected sample, changing the original state of the frozen soil sample, and affecting the resistivity measurement. Therefore, a technology of water-cooling the cutting tool or drill bit has emerged to reduce the transfer of heat to the frozen soil. However, the coolant of the above technology is in a non-flowing state inside the cutting tool, and the cooling effect on the tool is poor. As the tool continues to rotate and generates heat due to friction with the soil, the coolant inside it will also be heated to a certain temperature. Therefore, the temperature control effect will gradually be lost, and the frozen soil sample still has the risk of heating up and melting.

[0026] When collecting frozen soil samples, the present invention uses the handrail 4 to hold the operating platform 1, aligns the sampling tube 3 with the soil layer, controls the rotating seat 2 to drive the sampling tube 3 to rotate through the connecting rod 5, and screws the cutting part 6 of the sampling tube 3 into the soil layer, prompting the soil to enter the sampling tube 3. The coolant in the cooling chamber 7 can absorb the friction heat generated by the cutting part 6. As the sampling tube 3 continues to enter the soil, the temperature of the coolant in the cooling chamber 7 will gradually increase. Through the drainage component in the drainage hole 9, the coolant between the cooling chamber 7 and the heat exchange chamber 8 is continuously exchanged through the drainage hole 9 and the guide hole 10, diluting the heat absorbed by the coolant and reducing the heat absorbed by the coolant and the cutting part. 6, and after the high-temperature coolant enters the heat exchange chamber 8 from the cooling chamber 7, since the outer wall of the sampling tube 3 is in direct contact with the low-temperature frozen soil layer outside, the low-temperature soil can be used to cool the high-temperature coolant entering the heat exchange chamber 8, and the formed low-temperature coolant continues to absorb the heat of the cutting part 6 when it returns to the cooling chamber 7 again, forming a cyclic heat exchange process of heat absorption and heat release to improve the cooling efficiency of the cutting part 6, and achieve the cutting part 6 to be kept within a certain temperature during the entire sampling process. On the one hand, it can improve the cutting efficiency of the cutting part 6 and prevent the tool from being damaged. On the other hand, it can prevent the high-temperature cutting part 6 from melting the frozen soil, thereby ensuring the collection quality of the soil sample.

[0027] The operating platform 1 and rotating base 2 are both annular in design, with multiple connecting rods 5 arranged in a circular array. A connecting sleeve 11 is provided on the upper side of the rotating base 2; a ring gear 12 is fixedly connected to the top of the connecting sleeve 11; a motor 13 is fixedly connected to the surface of the operating platform 1; the motor 13 and the ring gear 12 are connected by a gear 14. The motor 13 drives the rotating base 2 to rotate through the gear 14, the ring gear 12, and the connecting sleeve 11, thereby controlling the sampling barrel 3 to be screwed into the soil. During the sampling process, the sampling barrel 3 should not rotate too fast to minimize friction between the cutting portion 6 and the soil, thereby reducing heat generation.

[0028] As another embodiment of the present invention, the top of the sampling tube 3 is connected to a storage tube 15; a handle 16 is fixedly connected to the upper end of the storage tube 15; and a sealing cap 17 is provided at the bottom of the storage tube 15. The storage tube 15 and the sampling tube 3, as well as the sealing cap 17, are both threadedly connected. During the sampling process, as the sampling tube 3 continues to drill into the soil layer, the soil in the sampling tube 3 can flow into the bottom opening of the storage tube 15 to preserve the sample. A worker then reaches into the connecting sleeve 11 and between the multiple connecting rods 5, rotates the storage tube 15 using the handle 16, removes it, and screws the sealing cap 17 onto its bottom. The storage tube 15 is then used as a temporary storage and transportation container for frozen soil samples, which can be sent to the laboratory for resistivity measurement, thereby improving transfer efficiency.

[0029] A temperature sensor 18 is fixedly connected to the inner wall surface of the storage cylinder 15; the storage cylinder 15 is designed as a double-layer hollow structure; an MCU and a semiconductor refrigeration plate 19 are provided on the top of the storage cylinder 15; the cooling surface of the semiconductor refrigeration plate 19 is located inside the hollow structure of the storage cylinder 15.

[0030] When frozen soil begins to enter the storage tube 15, the temperature sensor 18 is used to detect the initial temperature of the soil. The soil state corresponding to this temperature is the natural original state of the frozen soil. The MCU is used to record this initial temperature. During the subsequent storage and transportation process, if the temperature sensor 18 detects that the temperature change inside the storage tube 15 reaches a certain threshold, the MCU controls the semiconductor refrigeration plate 19 to start working, lowering the air temperature inside the hollow structure of the storage tube 15, using low-temperature air to isolate the temperature inside and outside the storage tube 15, and cooling the soil sample in the storage tube 15 until the data detected by the temperature sensor 18 approaches the initial temperature, thereby restoring the original natural state of the soil, such as the moisture content, and improving the authenticity of the resistivity measurement.

[0031] In another embodiment of the present invention, a booster plate 20 is slidably connected to the top of the storage tube 15; a tension spring 21 is fixedly connected between the booster plate 20 and the storage tube 15; and an access port 22 is provided at the top of the storage tube 15. To remove soil from the storage tube 15, an external rod-shaped tool can be inserted through the access port 22 into the storage tube 15, pressing the booster plate 20 downward to remove the soil sample, thus simplifying sample removal.

[0032] As another embodiment of the present invention, the drainage assembly includes a telescopic part and a guide block 23; the telescopic part 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 sealedly fitted inside the fixed sleeve 24; the guide block 23 is fixedly connected to the lower end of the telescopic core rod 25, and the guide block 23 is slidably fitted with the drainage hole 9; a guide hole 26 is opened inside the guide block 23; an inclined elastic petal 27 is fixedly connected to the lower side of the guide block 23 at a position corresponding to the guide hole 26.

[0033] An annular groove 28 is provided inside the rotating seat 2; an annular plate 29 is provided inside the annular groove 28 for sliding sealing; a group of magnetic blocks 30 are evenly 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 are evenly distributed at corresponding positions of the annular groove 28 inside the operating platform 1; 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 is connected to the fixed sleeve 24 through an air pipe 33, and the air pipe 33 passes through the inside of the connecting rod 5.

[0034] The specific working process of the drainage component is as follows: as the rotating seat 2 continues to rotate, when the magnetic block 30 moves to align 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, and the annular plate 29 squeezes the air at the bottom of the annular groove 28 into the interior of multiple fixed sleeves 24 through the air pipe 33, prompting the telescopic core rod 25 to extend downward and drive 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 is sucked back from the bottom of the annular groove 28, and the telescopic core rod 25 drives the guide block 23 to reset upward. By controlling the guide block 23 to continuously reciprocate periodically inside the drainage hole 9, when the guide block 23 moves to When moving downward, the elastic flap 27 is deformed upward under the resistance of the coolant, fits onto the surface of the guide block 23 and blocks the guide hole 26. At this time, the coolant cannot flow through the guide hole 26, and the guide block 23 can push the coolant below it toward the cooling chamber 7. Then part of the coolant in the cooling chamber 7 flows upward to the heat exchange chamber 8 through the 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 coolant above the guide block 23 can flow downward through the guide hole 26. Through the intermittent opening and closing of the guide hole 26, the drainage hole 9 can be drained unidirectionally downward and the guide hole 10 can be drained unidirectionally upward, thereby improving the exchange efficiency of the coolant in the cooling chamber 7 and the heat exchange chamber 8.

[0035] In another embodiment of the present invention, the outer layer of heat exchange chamber 8 is made of a heat-conducting material 34, such as alumina ceramic or copper, and the inner layer of heat exchange chamber 8 is made of a heat-insulating material 35, such as polystyrene or calcium silicate board. When the coolant in cooling chamber 7 enters heat exchange chamber 8, it rapidly exchanges heat with the frozen soil outside sampling tube 3 through the outer layer of heat-conducting material 34. Meanwhile, the inner layer of heat-insulating material 35 prevents heat from being transferred to the collected soil sample.

[0036] As another embodiment of the present invention, a spoiler 36 is hinged on the inner wall surface of the cooling chamber 7; an elastic member 37 is fixedly connected between the spoiler 36 and the inner wall of the cooling chamber 7; and a connecting main rope 38 is fixedly connected between the guide block 23 and the spoiler 36.

[0037] The spoilers 36 and the elastic members 37 are each provided in a group; connecting sub-strings 39 are fixedly connected between adjacent spoilers 36 .

[0038] When the guide block 23 moves upward, the multiple spoilers 36 are driven to deflect upward by connecting the main rope 38 and the connecting sub-rope 39. When the guide hole 26 moves downward, the connecting main rope 38 is loosened, and the elastic member 37 drives the multiple spoilers 36 to deflect downward. The continuous up and down swinging of the spoiler 36 stirs and disturbs the coolant inside the cooling chamber 7, thereby improving the uniformity of the heat distribution of the coolant, further enabling sufficient heat exchange between the coolant and the cutting part 6, and enhancing the temperature control effect of the cutting part 6.

[0039] The above-mentioned front, back, left, right, up and down are all based on the Figure 1 As a benchmark, according to the person's observation perspective, 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 so on.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention.

[0041] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil sampling device for measuring soil resistivity, comprising an operating platform (1), a rotating seat (2) and a sampling tube (3); The operating platform (1) is fixedly connected to a set of handrails (4) on the side; the operating platform (1) is rotatably connected to a rotating seat (2) at the bottom; the lower side of the rotating seat (2) is fixedly connected to a sampling cylinder (3) via a set of connecting rods (5); the bottom of the sampling cylinder (3) is provided with a cutting portion (6); Its characteristics are: A cooling chamber (7) is provided inside the side wall of the cutting portion (6); a heat exchange chamber (8) is provided inside the side wall of the sampling tube (3); a group of drainage holes (9) and guide holes (10) are uniformly distributed between the cooling chamber (7) and the heat exchange chamber (8); the cooling chamber (7), the heat exchange chamber (8), the drainage holes (9) and the guide holes (10) are all filled with cooling liquid; A drainage component is provided inside the drainage hole (9); the drainage component is used to exchange the cooling liquid inside the cooling chamber (7) and the heat exchange chamber (8).

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

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

4. A soil sampling device for measuring soil resistivity according to claim 3, characterized in that: A temperature sensor (18) is fixedly connected to the inner wall surface of the storage cylinder (15); the storage cylinder (15) is designed as a double-layer hollow structure; an MCU and a semiconductor refrigeration plate (19) are provided on the top of the storage cylinder (15); and the cooling surface of the semiconductor refrigeration plate (19) is located inside the hollow structure of the storage cylinder (15).

5. The soil sampling device for measuring soil resistivity according to claim 3, characterized in that: 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 operating port (22) is provided at the top of the storage cylinder (15).

6. A soil sampling device for measuring soil resistivity according to claim 1, characterized in that: The drainage assembly comprises a telescopic member and a guide block (23); the telescopic member comprises 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 engaged with the drainage hole (9); a guide hole (26) is provided inside the guide block (23); and an inclined elastic flap (27) is fixedly connected to the lower side of the guide block (23).

7. A soil sampling device for measuring soil resistivity according to claim 6, characterized in that: An annular groove (28) is provided inside the rotating seat (2); an annular plate (29) is provided inside the annular groove (28) for sliding sealing; a group of magnetic blocks (30) are evenly 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) are evenly distributed inside the operating platform (1); and the bottom of the annular groove (28) and the fixed sleeve (24) are connected via air pipes (33).

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

9. The soil sampling device for measuring soil resistivity according to claim 7, characterized in that: A spoiler (36) is hingedly connected to the inner wall surface of the cooling chamber (7); an elastic member (37) is fixedly connected between the spoiler (36) and the inner wall of the cooling chamber (7); and a connecting main rope (38) is fixedly connected between the guide block (23) and the spoiler (36).

10. The soil sampling device for measuring soil resistivity according to claim 9, characterized in that: A group of the spoilers (36) and the elastic members (37) are provided; and connecting sub-strings (39) are fixedly connected between adjacent spoilers (36).

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