Soil testing device and its application in environmental remediation

Abstract

This invention relates to the field of soil testing technology, and discloses a soil testing device and its application in environmental remediation. The device comprises a support component, a drilling component, a sampling component, a testing component, and a discharge component. The sampling component directly crushes the soil to be tested, ensuring timely soil collection while avoiding damage caused by the probe being directly inserted into the soil. The testing component, inserted directly into the soil, effectively ensures the accuracy of soil testing, solving the problem of poor timeliness in soil collection and testing in current commercially available devices, and also preventing damage caused by the probe being directly inserted into the soil. During soil collection, the discharge component can block the soil below while the sampling component is crushing the soil. Once soil particles are picked up and entered into the sampling component, this portion of soil is isolated to prevent it from falling out. After soil testing is completed, the discharge component is controlled to discharge the soil from the sampling component.

Description

Technical Field

[0001] This invention relates to the field of soil testing technology, and in particular to a soil testing device and its application in environmental remediation. Background Technology

[0002] In the process of soil remediation, it is sometimes necessary to first use tools such as auger drills to dig samples from deep soil to the surface, and then collect the samples and put them into a testing chamber for testing. Manually placing the samples into the testing chamber is inefficient, and the method of collecting soil and then transporting it to the laboratory for testing can greatly increase the inaccuracy of soil testing due to soil deterioration during transportation. On the other hand, the method of collecting soil samples on the ground and then conducting direct testing is also prone to soil deterioration after arriving at the ground, which may affect the accuracy of the test.

[0003] In a soil testing device with application number CN201911160560.2, a testing cylinder drives a sampling component to move up and down. After the sampling device takes soil samples from below the drill bit, it cannot be placed directly on the testing platform. Directly placing the soil on the sampling device does not allow for more direct testing and observation of the soil condition. A horizontal cylinder moves the sampling device after sampling. After the sampling claw on the sampling device aligns with the testing platform, the soil to be tested in the sampling claw will naturally fall onto the testing platform, thus ensuring that the camera can normally capture the actual condition of the soil. A cross-line detection probe is then inserted into the soil for testing.

[0004] In practical applications, the most direct way to detect soil pollution is to conduct direct soil testing. However, the greater the soil depth, the greater the soil hardness. Since current testing devices lack the function of loosening the soil before testing, if the probe is too large, it cannot be inserted into the soil when conducting deep soil testing. This means that even if the probe can be inserted into the soil, the hardness of the soil will damage the probe, greatly affecting the progress of soil testing.

[0005] Therefore, the present invention addresses the above-mentioned problems through a soil testing device and its application in environmental remediation. Summary of the Invention

[0006] The purpose of this invention is to provide a soil testing device and its application in environmental remediation, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a soil testing device, comprising:

[0008] A support assembly that provides an installation foundation and improves drilling stability;

[0009] A soil drilling assembly, which is mounted on a support assembly, enables soil breaking operations and facilitates direct soil testing.

[0010] The sampling component is installed inside the soil drilling component. After the soil breaking operation is completed, the soil at the location to be tested is directly crushed by the sampling component, and the crushed soil particles are picked up at the same time.

[0011] The detection component is installed inside the sampling component and is directly inserted into the picked-up soil particles to achieve direct detection, thereby improving detection accuracy.

[0012] The discharge component is encapsulated at the bottom of the sampling component. When the sampling component crushes the soil, it blocks the soil below. When soil particles are picked up and put into the sampling component, it isolates the soil in the sampling component to prevent it from falling. After the soil test is completed, the discharge component is controlled to discharge the soil in the sampling component.

[0013] Preferably, the drilling assembly includes a drill barrel, a drill bit is hinged to the bottom of the drill barrel, a first spiral ring is provided on the surface of the drill bit, the drill bit is spliced ​​from three sets of drilling units with the same structure, and a second hydraulic telescopic cylinder is hinged between the inner wall of each set of drilling units and the bottom of the inner wall of the drill barrel.

[0014] Preferably, the drilling assembly further includes a third hydraulic telescopic cylinder fixed to the top of the drill barrel cavity, the output end of the third hydraulic telescopic cylinder is fixedly installed with an outer protective box, and a second drive motor is fixedly installed inside the outer protective box.

[0015] Preferably, the sampling assembly includes a sampling cylinder fixed to the output end of the second drive motor. A sampling head is integrally formed at the bottom of the sampling cylinder. A second spiral ring is provided on the outer surface of the sampling head. A discharge hole is opened at the bottom end of the sampling head. A flexible filter screen is fitted on the top outer edge of the sampling cylinder. A spiral blade is provided on the outer wall of the sampling cylinder. A guide plate corresponding to the flexible filter screen is integrally formed at the end of the spiral blade. The bottom end of the spiral blade and the top end of the second spiral ring are connected and correspond to each other.

[0016] Preferably, the detection assembly includes a fourth hydraulic telescopic cylinder fixed at the center of the top of the inner cavity of the sampling cylinder, a detection probe is fixedly installed at the output end of the fourth hydraulic telescopic cylinder, and a cleaning cotton ring is fixed at the bottom of the fourth hydraulic telescopic cylinder, the cleaning cotton ring and the detection probe being matched.

[0017] Preferably, the detection assembly further includes a pressure-bearing gas storage bag fixedly installed between the third hydraulic telescopic cylinder and the outer protective box, and a first pushing member is fixedly installed on the outer edge of the top of the sampling cylinder inner cavity, and the first pushing member is fixedly sleeved on the outer wall of the fourth hydraulic telescopic cylinder.

[0018] Preferably, the top of the sampling cylinder has an installation groove that matches the flexible filter screen, and the flexible filter screen is a concave filter screen. The first pushing member is fixed between the flexible filter screen and the fourth hydraulic telescopic cylinder. The first pushing member is a pressure-bearing air bag, and the pressure-bearing air storage bag is connected to the first pushing member through an air guide pipe.

[0019] Preferably, the discharge assembly includes a collection hopper fixed to the bottom of the inner wall of the sampling cylinder. A discharge channel corresponding to the discharge hole is opened at the center of the bottom of the collection hopper. Four sets of identical material blocking plates are hinged to the bottom of the discharge channel, and the four sets of material blocking plates are assembled into a sealing plate that matches the discharge channel.

[0020] Preferably, the outer wall of each set of material blocking plates is an inclined surface, and a second pushing member is fixedly assembled between the inclined surface and the inner wall of the discharge channel. The second pushing member is an inflatable air bag, and the inflatable air bag is connected to the first pushing member through an air supply pipe. The end of each set of material blocking plates is set as an arc-shaped surface, and the arc-shaped surface is centered at the hinge point between the material blocking plate and the collecting hopper.

[0021] This invention provides an application of the soil testing device described above in environmental remediation. Before carrying out soil remediation, it is necessary to test the soil pH of the remediation site to facilitate the selection of a targeted remediation plan.

[0022] The technical effects and advantages of this invention are as follows:

[0023] 1. When the third hydraulic telescopic cylinder of this invention extends outward, it can penetrate the sampling component into the soil. As the second hydraulic telescopic cylinder extends outward, the soil at the detection position is crushed and conveyed upward by the conveying action of the spiral blades. Then, it is sent to the flexible filter screen through the guide plate. The flexible filter screen can screen out fine soil particles. At the same time, the rotation of the second drive motor can accelerate the screening of soil particles by the flexible filter screen. This realizes the picking up of soil for testing while ensuring the looseness of the soil. When the fourth hydraulic telescopic cylinder extends outward, it drives the detection probe to move downward and directly insert into the soil. This allows for direct crushing of the soil to be tested. This ensures the timeliness of soil collection and avoids the problem of damage caused by the detection probe being directly inserted into the soil. It can also effectively ensure the accuracy of soil testing.

[0024] 2. During material discharge, the gas inside the pressurized gas storage bag is introduced into the first pushing component through the gas guide pipe. This causes the first pushing component to expand, squeezing the bottom of the flexible filter screen and causing it to deform. As the second drive motor rotates the sampling cylinder, large soil particles in the flexible filter screen are cleaned out, preventing clogging when soil particles become stuck. Simultaneously, the gas in the first pushing component is introduced into the second pushing component through the gas delivery pipe, causing the second pushing component to expand. This pushes all four sets of material blocking plates downwards, opening the discharge channel and allowing the residual soil inside the sampling cylinder to be discharged through the discharge channel. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic cross-sectional view of the soil drilling assembly of the present invention;

[0027] Figure 3 This is a bottom view of the structure of the soil drilling assembly of the present invention;

[0028] Figure 4 This is a schematic diagram of the internal structure of the soil drilling assembly of the present invention from a first-view perspective.

[0029] Figure 5 This is a schematic diagram of the internal structure of the soil drilling assembly of the present invention from a second perspective.

[0030] Figure 6 This is a schematic diagram of the material collection hopper structure of the present invention;

[0031] Figure 7 This is an enlarged structural diagram of part A of the present invention.

[0032] In the diagram: 10. Support assembly; 11. Top plate; 12. Inclined support rod; 13. Guide ring; 14. First hydraulic telescopic cylinder; 15. First drive motor; 20. Soil drilling assembly; 21. Drill barrel; 22. Drill bit; 23. First spiral ring; 24. Second hydraulic telescopic cylinder; 25. Third hydraulic telescopic cylinder; 26. Outer protective box; 27. Second drive motor; 30. Sampling assembly; 31. Sampling cylinder; 32. Sampling head; 33. Second spiral ring; 34. Discharge hole; 35. Flexible filter screen; 36. Spiral blade; 37. Guide plate; 40. Detection assembly; 41. Fourth hydraulic telescopic cylinder; 42. Detection probe; 43. Cleaning cotton ring; 44. Pressure-bearing air storage bag; 45. First pusher; 50. Discharge assembly; 51. Collection hopper; 52. Discharge channel; 53. Material blocking plate; 54. Second pusher; 55. Arc-shaped surface. Detailed Implementation

[0033] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] This embodiment provides, for example Figures 1 to 7 A soil testing device is shown, comprising:

[0035] Support component 10 provides an installation foundation and improves drilling stability;

[0036] The soil drilling component 20 is installed on the support component 10 to realize the soil breaking operation and facilitate direct soil testing.

[0037] Sampling component 30 is installed inside the soil drilling component 20. After the soil breaking operation is completed, the soil at the location to be tested is directly crushed by the sampling component 30, and the crushed soil particles are picked up at the same time.

[0038] The detection component 40 is installed inside the sampling component 30 and is directly inserted into the picked-up soil particles to achieve direct detection, thereby improving detection accuracy.

[0039] The discharge component 50 is encapsulated at the bottom of the sampling component 30. When the sampling component 30 crushes the soil, it blocks the soil below. After soil particles are picked up and placed inside the sampling component 30, the discharge component 50 isolates the soil within the component to prevent it from falling out. After soil testing is completed, the discharge component 50 is controlled to discharge the soil from the sampling component 30. Specifically:

[0040] Please see Figure 1 The support assembly 10 includes a top plate 11. Three sets of inclined support rods 12 are evenly distributed at the bottom of the top plate 11. The three sets of inclined support rods 12 are fixedly connected by connecting rods to a guide ring 13 that matches the soil drilling assembly 20. A first hydraulic telescopic cylinder 14 is fixedly installed at the bottom of the top plate 11. A first drive motor 15 is fixedly installed at the output end of the first hydraulic telescopic cylinder 14. The first hydraulic telescopic cylinder 14 can drive the soil drilling assembly 20 to move downward, which facilitates the adjustment of soil depth. The inclined support rods 12 provide stability for the soil drilling assembly 20 during use, and the guide ring 13 can limit and guide the soil drilling assembly 20.

[0041] Please see Figure 2 and Figure 3The soil drilling assembly 20 includes a drill cylinder 21, which is fixed to the output end of the first drive motor 15. A drill bit 22 is hinged to the bottom of the drill cylinder 21. A first spiral ring 23 is provided on the surface of the drill bit 22. The drill bit 22 is composed of three sets of drilling units with the same structure. A second hydraulic telescopic cylinder 24 is hinged between the inner wall of each drilling unit and the bottom of the inner wall of the drill cylinder 21. When the first drive motor 15 is activated, it can drive the soil drilling assembly 20 to rotate, so that the soil breaking and excavation operation can be realized through the soil drilling assembly 20 during the downward movement of the first hydraulic telescopic cylinder 14, which facilitates the collection and sampling of soil at depth. After the soil breaking operation is completed, the second hydraulic telescopic cylinder 24 is controlled to open the drilling unit, which can be used to remove the loose soil at the drilling position, so that the soil will be directly exposed below the sampling assembly 30.

[0042] Please see Figures 2-5 The soil drilling assembly 20 also includes a third hydraulic telescopic cylinder 25 fixed to the top of the inner cavity of the drill barrel 21. An outer protective box 26 is fixedly installed at the output end of the third hydraulic telescopic cylinder 25. A second drive motor 27 is fixedly installed inside the outer protective box 26. When the second drive motor 27 is activated, it drives the sampling assembly 30 to rotate and achieves soil crushing through the second spiral ring 33.

[0043] Please see Figure 4 and Figure 5 The sampling assembly 30 includes a sampling cylinder 31 fixed to the output end of the second drive motor 27. A sampling head 32 is integrally formed at the bottom of the sampling cylinder 31. A second spiral ring 33 is provided on the outer surface of the sampling head 32. A discharge hole 34 is opened at the bottom end of the sampling head 32. A flexible filter screen 35 is assembled on the top outer edge of the sampling cylinder 31. A spiral blade 36 is provided on the outer wall of the sampling cylinder 31. The spiral blade 36 is similar to a conveying auger and plays the role of material conveying. A guide plate 37 corresponding to the flexible filter screen 35 is integrally formed at the end of the spiral blade 36, and the bottom end of the spiral blade 36 and the top end of the second spiral ring 33 are connected and correspond to each other.

[0044] When the third hydraulic telescopic cylinder 25 extends outward, the sampling component 30 can be inserted deep into the soil. As the third hydraulic telescopic cylinder 25 extends outward, the soil at the detection position is broken up and conveyed upward by the conveying action of the spiral blades 36. Then, it is sent to the flexible filter screen 35 through the guide plate 37. The flexible filter screen 35 screens out fine soil particles. At the same time, with the rotation of the second drive motor 27, the centrifugal action can accelerate the screening of soil particles by the flexible filter screen 35. This achieves the picking up of the soil for testing while ensuring the looseness of the soil.

[0045] Please see Figure 4 and Figure 5The detection component 40 includes a fourth hydraulic telescopic cylinder 41 fixed at the center of the top of the inner cavity of the sampling cylinder 31. A detection probe 42 is fixedly installed at the output end of the fourth hydraulic telescopic cylinder 41, and a cleaning cotton ring 43 is fixed at the bottom of the fourth hydraulic telescopic cylinder 41. The cleaning cotton ring 43 and the detection probe 42 are matched. After the soil is collected by the sampling component 30, the fourth hydraulic telescopic cylinder 41 extends outward, driving the detection probe 42 to move downward and directly into the soil. The soil at the test site can be directly tested, which not only ensures the timeliness of soil collection, but also avoids the problem of damage caused by the detection probe 42 being directly inserted into the soil. It can also effectively ensure the accuracy of soil testing and is highly practical. After the detection probe 42 completes the soil index collection and testing, the fourth hydraulic telescopic cylinder 41 retracts inward, driving the detection probe 42 to move upward and retract into the cleaning cotton ring 43. In this way, the cleaning cotton ring 43 can scrape and clean the detection probe 42, achieving the purpose of soil cleaning and preventing it from affecting subsequent soil testing.

[0046] Please see Figures 4-7 The discharge assembly 50 includes a hopper 51 fixed to the bottom of the inner wall of the sampling cylinder 31. A discharge channel 52 corresponding to the discharge hole 34 is opened at the center of the bottom of the hopper 51. Four sets of identical baffle plates 53 are hinged to the bottom of the discharge channel 52, and the four sets of baffle plates 53 are combined to form a sealing plate that matches the discharge channel 52. The hopper 51 can seal the bottom of the sampling cylinder 31. In this way, when the sampling cylinder 31 rotates to crush the soil at the test site, the soil below is blocked by the hopper 51 and the baffle plates 53, preventing the soil from entering the sampling cylinder 31 from the discharge hole 34 and the discharge channel 52 without being crushed, thereby improving the accuracy of the test.

[0047] It should be noted that after the soil is broken up and enters the sampling cylinder 31, the soil is squeezed into the discharge hole 34. Therefore, this part of the soil can block the material blocking plate 53. After the soil sampling is completed, it can prevent the picked-up soil from putting pressure on the material blocking plate 53 and forcing the material blocking plate 53 to rotate and be discharged from the discharge channel 52. This can achieve the isolation effect of the picked-up soil and improve the detection accuracy of the detection probe 42.

[0048] It is worth noting that, please refer to Figure 4 and Figure 5The detection component 40 also includes a pressure-bearing air storage bag 44 fixedly installed between the third hydraulic telescopic cylinder 25 and the outer protective box 26. A first pusher 45 is fixedly installed on the outer edge of the top of the inner cavity of the sampling cylinder 31, and the first pusher 45 is fixedly sleeved on the outer wall of the fourth hydraulic telescopic cylinder 41. The top of the sampling cylinder 31 is provided with an installation groove that matches the flexible filter screen 35, and the flexible filter screen 35 is a concave filter screen. The first pusher 45 is fixed between the flexible filter screen 35 and the fourth hydraulic telescopic cylinder 41. The first pusher 45 is a pressure-bearing air bag, and the pressure-bearing air storage bag 44 is connected to the first pusher 45 through an air guide pipe.

[0049] When the soil testing is completed and discharge is required, the third hydraulic telescopic cylinder 25 is retracted, which moves the sampling cylinder 31 upward. At this time, the sampling cylinder 31 is pulled out from the testing position, and the soil previously introduced into the discharge hole 34 falls out. At the same time, the second drive motor 27 continues to rotate, which allows large soil particles at the top of the flexible filter screen 35 to be thrown out by centrifugal force. Soil particles stuck in the flexible filter screen 35 cannot be thrown out by centrifugal force. At this time, because the sampling cylinder 31 and the outer protective box 26 are synchronously moved by the third hydraulic telescopic cylinder... Driven by the upward movement of component 25, the pressure-bearing gas storage bag 44 is compressed. The gas inside the pressure-bearing gas storage bag 44 is then introduced into the first pushing component 45 through the air guide pipe. This causes the first pushing component 45 to expand, squeezing the bottom of the flexible filter screen 35 and causing it to deform. As the second drive motor 27 drives the sampling cylinder 31 to rotate, large soil particles in the flexible filter screen 35 are cleaned out, preventing clogging when soil particles become stuck and facilitating the next step of the testing work.

[0050] Please see Figure 6 and Figure 7 Each set of material blocking plates 53 has an outer wall that is inclined, and a second pusher 54 is fixedly installed between the inclined surface and the inner wall of the discharge channel 52. The second pusher 54 is an expansion air bag, and the expansion air bag is connected to the first pusher 45 through an air supply pipe. A solenoid valve is installed on the air supply pipe. The end of each set of material blocking plates 53 is set as an arc surface 55, and the arc surface is centered at the hinge point between the material blocking plate 53 and the hopper 51.

[0051] After the third hydraulic telescopic cylinder 25 resets, the air pressure inside the first pusher 45 reaches its maximum, and the second drive motor 27 also stops rotating synchronously. This clears the soil particles stuck in the flexible filter screen 35. At this time, the control solenoid valve opens, and the gas in the first pusher 45 is introduced into the second pusher 54 through the air supply pipe, causing the second pusher 54 to expand. This pushes all four sets of material blocking plates 53 to flip downwards, opening the discharge channel 52. The soil remaining inside the sampling cylinder 31 can then be discharged through the discharge channel 52 and discharged through the discharge hole 34, completing the external discharge of the collected soil. Then, the control of the first hydraulic telescopic cylinder 14 retracts, which can drive the soil drilling assembly 20 to reset. At the same time, the control of the second hydraulic telescopic cylinder 24 retracts, which can drive the drilling unit to reset, completing the sealing of the bottom of the drill cylinder 21, thus completing the soil testing work.

[0052] This embodiment also discloses the application of the soil testing device described above in environmental remediation. Before soil remediation, it is necessary to test the soil pH of the remediation site to facilitate the selection of a targeted remediation plan. In use, the soil drilling component 20 breaks the soil, facilitating direct soil testing. The sampling component 30 directly crushes the soil at the testing location and picks up the crushed soil particles. The testing component 40 can be directly inserted into the picked-up soil particles for direct testing, improving testing accuracy. The discharge component 50 blocks the soil below when the sampling component 30 crushes the soil. When soil particles are picked up and enter the sampling component 30, the soil in the sampling component 30 is isolated to prevent it from falling out. After the soil testing is completed, the discharge component 50 is controlled to discharge the soil from the sampling component 30.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A soil testing device, characterized in that: The system includes a support assembly; a soil drilling assembly mounted on the support assembly; a sampling assembly installed inside the soil drilling assembly, which directly crushes the soil at the testing location after the soil breaking operation is completed, and picks up the crushed soil particles; a detection assembly installed inside the sampling assembly, which is directly inserted into the picked-up soil particles for direct detection; and a discharge assembly encapsulated at the bottom of the sampling assembly, which blocks the soil below when the sampling assembly crushes the soil, isolates the soil in the sampling assembly after the soil particles are picked up and prevents them from falling, and controls the discharge assembly to discharge the soil from the sampling assembly after the soil testing is completed. The detection assembly includes a fourth hydraulic telescopic cylinder fixed at the center of the top of the sampling cylinder's inner cavity. A detection probe is fixedly installed at the output end of the fourth hydraulic telescopic cylinder. A cleaning cotton ring is fixed at the bottom of the fourth hydraulic telescopic cylinder, matching the detection probe. A pressure-bearing air storage bag is fixedly installed between the third hydraulic telescopic cylinder and the outer protective box. A first pushing member is fixedly installed on the outer edge of the top of the sampling cylinder's inner cavity, and the first pushing member is fixedly sleeved on the outer wall of the fourth hydraulic telescopic cylinder. The top of the sampling cylinder has an installation groove that matches the flexible filter screen. The flexible filter screen is a concave filter screen. The first pushing member is fixed between the flexible filter screen and the fourth hydraulic telescopic cylinder. The first pushing member is a pressure-bearing air bag, and the pressure-bearing air storage bag is connected to the first pushing member through a gas guide pipe. The gas inside the pressure-bearing air storage bag is introduced into the first pushing member through the gas guide pipe. The first pushing member expands and squeezes the bottom of the flexible filter screen, causing the flexible filter screen to deform. During the process of the second drive motor driving the sampling cylinder to rotate, large soil particles in the flexible filter screen are cleaned out, and anti-clogging treatment is achieved when soil particles are stuck. The discharge assembly includes a hopper fixed to the bottom of the inner wall of the sampling cylinder. A discharge channel corresponding to the discharge hole is opened at the center of the bottom of the hopper. Four sets of identical material blocking plates are hinged to the bottom of the discharge channel. The four sets of material blocking plates are assembled into a sealing plate that matches the discharge channel. The outer wall of each set of material blocking plates is inclined. A second pushing component is fixedly installed between the inclined surface and the inner wall of the discharge channel. The second pushing component is an inflatable air bag. The inflatable air bag is connected to the first pushing component through an air supply pipe. The end of each set of material blocking plates is set as an arc surface with the hinge point between the material blocking plate and the hopper as the center.

2. The soil testing device according to claim 1, characterized in that: The soil drilling assembly includes a drill barrel, with a drill bit hinged to the bottom of the drill barrel. A first spiral ring is provided on the surface of the drill bit. The drill bit is composed of three sets of identical drilling units. A second hydraulic telescopic cylinder is hinged between the inner wall of each drilling unit and the bottom of the inner wall of the drill barrel.

3. The soil testing device according to claim 2, characterized in that: The drilling assembly also includes a third hydraulic telescopic cylinder fixed to the top of the drill barrel cavity. An outer protective box is fixedly installed at the output end of the third hydraulic telescopic cylinder, and a second drive motor is fixedly installed inside the outer protective box.

4. The soil testing device according to claim 3, characterized in that: The sampling assembly includes a sampling cylinder fixed to the output end of the second drive motor. A sampling head is integrally formed at the bottom of the sampling cylinder. A second spiral ring is provided on the outer surface of the sampling head. A discharge hole is opened at the bottom end of the sampling head. A flexible filter screen is fitted on the top outer edge of the sampling cylinder. Spiral blades are provided on the outer wall of the sampling cylinder. A guide plate corresponding to the flexible filter screen is integrally formed at the end of the spiral blades. The bottom end of the spiral blades and the top end of the second spiral ring are connected and correspond to each other.

5. The application of the soil testing device as described in claim 4 in environmental remediation.

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