A shallow soil sampling device for geotechnical engineering investigation

Abstract

This invention discloses a shallow soil sampling device for geotechnical engineering exploration. The device includes a movable base, a support base fixedly connected to the top of the movable base, a sampling mechanism mounted on the support base, and a sampling port on the movable base. The sampling mechanism includes a motor, a spiral blade, a lifting assembly, a moving assembly, and a sampling component. The motor is fixedly connected to the support base, and a telescopic shaft is fixedly connected to the bottom of the motor. A rotating chuck is fixedly connected to the bottom of the telescopic shaft. The spiral blade is fixedly connected to the bottom of the rotating chuck and faces the sampling port. The sampling component is fixedly connected to the bottom of the spiral blade. This invention uses a motor to drive the telescopic shaft to rotate, and the spiral blade and conical block allow for rapid drilling into shallow soil and rock. The moving assembly controls the extension and retraction of the sampling bin for sampling, reducing manual intervention. The wedge-shaped design of the sampling bin facilitates cutting into the soil and rock, and the limiting block, limiting groove, and buffer spring work together to ensure the integrity and accuracy of the sample.

Description

Technical Field

[0001] This invention relates to the field of geotechnical engineering investigation technology, specifically to a shallow soil sampling device for geotechnical engineering investigation. Background Technology

[0002] When conducting geotechnical engineering investigations, it is necessary to take samples of the soil layers to effectively analyze the soil and rock structure, which in turn helps with the construction of geotechnical engineering projects. Sampling equipment for geotechnical engineering investigations is required when taking samples.

[0003] Existing sampling equipment for geotechnical engineering investigation generally has advantages such as good sampling effect, high structural strength, and simple operation, which can meet the needs of sampling work in geotechnical engineering investigation. However, most existing sampling equipment relies on manual labor or the weight of the equipment to squeeze the sample into the soil, resulting in slow drilling speed and low sampling efficiency. To address the problem of low sampling efficiency in existing sampling devices, Chinese Patent CN114263459B discloses a shallow soil sampling device for geotechnical engineering investigation, including a top plate and a bottom plate. A drill cylinder is installed at the center of the bottom plate, and a first motor is installed at the top of the drill cylinder. Screws are installed on both sides of the top plate, and sprockets are welded to the outer sides of the screws. A chain is fitted on the sprockets, and a second motor is installed on the top of the top plate. The device uses a first motor to drive the drill barrel to rotate and sample, and a second motor to move the base plate to apply sampling pressure to the drill barrel, thereby increasing the drilling rate of the drill barrel into the rock and soil, improving sampling efficiency, and ensuring that the speed at which the ferrule moves downward through the base plate is consistent with the speed at which the drill barrel drills into the rock and soil, thus avoiding damage to the drill barrel due to excessive pushing speed.

[0004] However, while the existing sampling equipment for geotechnical engineering investigation can improve sampling efficiency, it requires manual adjustment of the position of the locking pin and the threaded sleeve during use, resulting in low flexibility. It also relies on mechanical linkage for height adjustment, leading to large errors. Furthermore, it depends on the squeezing action between the drill barrel and the wedge sleeve for sampling, which can easily deform or break the soil sample due to compression. The locking pin and spring are mainly used to fix the position of the screw rod and are not optimized for sample protection. There is no cleaning device, which can easily lead to drill barrel blockage after long-term use. The depth adjustment of the drill barrel depends on the mechanical displacement of the screw rod and threaded sleeve, making maintenance complex and resulting in high maintenance costs. Summary of the Invention

[0005] The purpose of this invention is to provide a shallow soil sampling device for geotechnical engineering investigation. This device can easily and automatically complete the soil sampling operation, reduce manual intervention, improve soil sampling efficiency, and ensure the integrity and accuracy of the soil samples.

[0006] To achieve the above-mentioned technical objectives, the present invention provides a shallow soil sampling device for geotechnical engineering exploration. The device includes a movable base, a support base fixedly connected to the top of the movable base, a sampling mechanism provided on the support base, and a sampling port opened on the movable base. The sampling mechanism includes a motor, a spiral blade, a lifting assembly, a moving assembly, and a sampling assembly. The motor is fixedly connected to the support base, a telescopic shaft is fixedly connected to the bottom of the motor, a rotating chuck is fixedly connected to the bottom of the telescopic shaft, and the spiral blade is fixedly connected to the bottom of the rotating chuck and faces the sampling port. The motor controls the overall rotation of the telescopic shaft, the rotating chuck, and the spiral blade.

[0007] The lifting assembly includes an electro-hydraulic rod arranged parallel to one side of the spiral blade. The bottom end of the electro-hydraulic rod is fixedly connected to the top surface of the movable seat. A limit rod is sleeved inside the rotating chuck. One end of the limit rod is rotatably connected to the outside of the rotating chuck, and the other end of the limit rod extends horizontally to the top of the electro-hydraulic rod and is connected to the piston end of the electro-hydraulic rod. The rotating chuck is controlled by the electro-hydraulic rod to drive the spiral blade to rise and fall.

[0008] The spiral blade has a cavity inside its rotating shaft. A sampling component is fixedly connected to the bottom of the spiral blade. The sampling component includes an outer shell, a conical block fixedly connected to the bottom of the outer shell, and a material-taking component disposed within the outer shell. The outer shell has a fixed groove and a movable groove that communicate with each other, and the fixed groove communicates with the cavity. The material-taking component is slidably installed in the movable groove, and a material-taking port communicating with the movable groove is opened on the side of the outer shell at a position corresponding to the movable groove. The movable component includes a miniature electric push rod fixedly connected to the cavity. The bottom of the miniature electric push rod extends into the fixed groove of the outer shell, and a movable push block is fixedly connected to its bottom. The movable push block is slidably placed in the fixed groove and connected to the material-taking component. Under the action of the miniature electric push rod, the movable push block moves downward and pushes the material-taking component to slide outward along the movable groove, and extends out of the outer shell through the material-taking port to take a sample.

[0009] A preferred technical solution of the present invention is as follows: a distance sensor is provided at the bottom of the limiting lever, a control box is provided on the support base, the signal output terminal of the distance sensor is connected to the signal input terminal of the control box, and the control box is electrically connected to the motor, the miniature electric push rod, and the electric hydraulic rod respectively.

[0010] The preferred technical solution of the present invention is as follows: Two movable slots are provided, symmetrically arranged on both sides below the fixed slot. The two movable slots are respectively connected to the fixed slot, and each movable slot is provided with a material-picking component. The outer shell is cylindrical, with two material-picking ports symmetrically arranged on its side. The material-picking component includes a movable block slidably connected in the movable slot. A groove is formed at one end of the movable block near the corresponding material-picking port, and a material-picking bin is slidably connected in the groove. Two fixed posts are symmetrically arranged at the bottom of the movable push block. Inclined slots are formed in both movable blocks, and the two inclined slots are distributed in an inverted V-shape. The two fixed posts pass through the inclined slots slidably connected to the corresponding movable blocks. When the movable push block moves down, it slides in the inclined slots through the fixed posts, thereby pushing the movable block out of the material-picking port along the movable slot. When the movable push block descends and contacts the top surface of the movable block, the fixed posts slide to the bottom of the inclined slot, and the movable block extends out of the corresponding material-picking port.

[0011] The preferred technical solution of the present invention is as follows: the support base is a 7-shaped support base, the bottom of the vertical support plate of the support base is fixed on the movable base, the motor and the sampling mechanism are installed on the horizontal support plate of the support base, and two elastic telescopic rods are fixedly connected on the side of the vertical support plate adjacent to the horizontal support plate. The telescopic ends of the two elastic telescopic rods are fixedly connected to the same cleaning brush, and the cleaning brush abuts against the outside of the corresponding spiral blade.

[0012] The preferred technical solution of the present invention is that the bottom of the movable seat is provided with four self-locking universal wheels.

[0013] The preferred technical solution of the present invention is as follows: the bottom end of the electro-hydraulic rod is fixedly connected to the top of the movable seat, the cross-section of the rotating chuck is concave, and the limiting chuck rod is rotatably connected to the outside of the rotating chuck.

[0014] The preferred technical solution of the present invention is as follows: two grooves are provided on each moving block, and the two grooves are symmetrically distributed at one end of the moving block near the material inlet. A material inlet is slidably connected in each groove. Limiting blocks are fixedly connected to the upper and lower sides of the material inlet. Limiting grooves are provided on the upper and lower sides of each groove. The limiting blocks of the material inlet are slidably placed in the corresponding limiting grooves. A buffer spring is fixedly connected in each limiting groove. The other end of the buffer spring is connected to the corresponding limiting block.

[0015] The preferred technical solution of the present invention is as follows: the movable push block is an inverted concave block, and two fixed posts are respectively set at the bottom of the movable push block.

[0016] The preferred technical solution of the present invention is as follows: when the buffer spring is in the contracted state, the material taking bin is completely placed in the corresponding groove and slides against the moving groove; the shape of the material taking bin is wedge-shaped; when the buffer spring is in the extended state, the material taking bin extends out of the groove.

[0017] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0018] (1) This invention uses a motor in the rotating assembly to drive the telescopic shaft, rotating chuck, and spiral blades to rotate. The spiral blades and the conical block design at the bottom allow them to easily drill into shallow soil and rock during rotation, enabling the device to quickly reach the soil extraction location and improving soil extraction efficiency. Furthermore, the miniature electric push rod in the moving assembly pushes the moving block, which slides within the moving groove through the cooperation of the fixed column and the inclined groove of the moving block. This process allows for control of the extension and retraction of the extraction bin, facilitating automatic soil extraction, reducing manual intervention, and further improving soil extraction efficiency.

[0019] (2) The sampling bin of this invention is set in the groove of the moving block and is wedge-shaped, which can better cut into the soil and rock and accurately obtain soil and rock samples. At the same time, the limiting blocks on the upper and lower sides of the sampling bin cooperate with the limiting groove and buffer spring on the moving block to play a buffering and stabilizing role during the soil sampling process, ensuring the integrity and accuracy of the soil sample. A distance sensor is provided at the bottom of the limiting rod, and the control box is electrically connected to the motor, micro electric push rod, and electric hydraulic rod. Through the information fed back by the distance sensor, the control box can accurately control the soil penetration depth of the device to avoid sampling too deep or too shallow, and ensure that shallow soil and rock samples that meet the requirements are obtained.

[0020] (3) The elastic telescopic rod inside the support base is connected to the cleaning brush. The cleaning brush abuts against the outside of the spiral blade. During the process of soil removal or retraction of the device, the cleaning brush can automatically clean the soil and rock attached to the spiral blade, keep the equipment clean, reduce the wear of the equipment, and extend the service life of the equipment. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the connection between the support base and the motor in this invention;

[0024] Figure 3 This is a schematic diagram of the connection between the telescopic shaft and the rotating chuck of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection between the helical blade and the conical block of the present invention;

[0026] Figure 5This is a schematic diagram of the connection between the miniature electric push rod and the movable push block of the present invention;

[0027] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point A;

[0028] Figure 7 This is a schematic diagram of the connection between the movable push block and the fixed column of the present invention;

[0029] Figure 8 This is a schematic diagram of the connection between the groove and the limiting groove of the present invention;

[0030] Figure 9 This is a schematic diagram of the connection between the moving block and the buffer spring in this invention;

[0031] Figure 10 This is a schematic diagram of the structure of the movable block extending out of the movable slot in this invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Movable seat; 2. Support seat; 3. Control box; 4. Motor; 5. Telescopic shaft; 6. Rotating chuck; 7. Helical blade; 8. Cavity; 9. Conical block; 10. Fixed groove; 11. Movable groove; 12. Miniature electric push rod; 13. Movable push block; 14. Fixed column; 15. Movable block; 16. Inclined groove; 17. Groove; 18. Feeding bin; 19. Limiting block; 20. Limiting groove; 21. Buffer spring; 22. Limiting lever; 23. Electro-hydraulic rod; 24. Distance sensor; 25. Elastic telescopic rod; 26. Cleaning brush; 27. Sampling port; 28. Self-locking caster wheel. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] The embodiment provides a shallow soil sampling device for geotechnical engineering investigation, such as Figures 1 to 10As shown, it includes a movable base 1, a support base 2 fixedly connected to the top of the movable base 1, a sampling port 27 is provided on the movable base 1, and a control box 3 and a sampling mechanism are provided on the support base 2, with the sampling mechanism facing the sampling port 27. The sampling mechanism includes a motor 4, a spiral blade 7, a lifting assembly, a moving assembly, and a sampling assembly. The motor 4 is fixedly connected to the support base 2, and a telescopic shaft 5 is fixedly connected to the bottom end of the motor 4. A rotating chuck 6 is fixedly connected to the bottom of the telescopic shaft 5, and the spiral blade 7 is fixedly connected to the bottom of the rotating chuck 6. The motor 4 controls the overall rotation of the telescopic shaft 5, the rotating chuck 6, and the spiral blade 7. The lifting assembly includes an electric hydraulic rod 23, which is parallel to one side of the spiral blade 7. The bottom end of the electric hydraulic rod 23 is fixedly connected to the top of the moving base 1. A limiting rod 22 is sleeved inside the rotating chuck 6. The rotating chuck 6 has a concave cross-section. The limiting rod 22 is rotatably connected to the outside of the rotating chuck and extends horizontally above the electric hydraulic rod 23 and is connected to the piston end of the electric hydraulic rod 23. The electric hydraulic rod 23 controls the rotating chuck 6 to drive the spiral blade 7 to rise and fall, and it can also descend through the sampling port 27 to extend into the soil layer.

[0036] In the embodiments, such as Figures 4 to 8As shown, the spiral blade 7 has a cavity 8 inside its rotating shaft. A sampling component is fixedly connected to the bottom of the spiral blade 7. The sampling component includes a cylindrical shell, a conical block 9 fixedly connected to the bottom of the cylindrical shell, and a material-taking component disposed inside the cylindrical shell. A fixed groove 10 is provided inside the cylindrical shell. Two movable grooves 11 are symmetrically opened on both sides of the fixed groove 10. The two movable grooves 11 are connected to the same fixed groove 10. The fixed groove 10 is connected to the cavity 8. The cylindrical shell has material-taking ports corresponding to the positions of the two movable grooves 11. The device includes two movable blocks 15 slidably connected within two movable slots 11. Two grooves 17 are formed on opposite sides of the two movable blocks 15. A material-collecting bin 18 is slidably connected within each groove 17. Limiting blocks 19 are fixedly connected to the upper and lower sides of each material-collecting bin 18. Limiting grooves 20 are correspondingly formed on the upper and lower sides of each groove 17. The limiting blocks 19 of the material-collecting bin 18 are slidably placed within the corresponding limiting grooves 20, and a buffer spring 21 is fixedly connected within each limiting groove 20. The other end of the buffer spring 21 is connected to the corresponding limiting block 19. When the buffer spring 21 is retracted, the material-collecting bin 18 is completely placed within the corresponding groove 17, flush with the groove 17, and slidably abuts against the movable slot 11. The material-collecting bin 18 is wedge-shaped. When the buffer spring 21 is extended, the material-collecting bin 18 extends out of the groove 17. The moving component includes a miniature electric push rod 12 fixedly connected in the cavity 8. The bottom of the miniature electric push rod 12 extends into the fixing groove 10 of the cylindrical shell. A movable push block 13 is fixedly connected to its bottom. The movable push block is an inverted concave block. The movable push block 13 is slidably connected in the fixing groove 10. Two fixing posts 14 are symmetrically arranged at the bottom of the movable push block 13. Inclined grooves 16 are opened in both movable blocks 15. The two inclined grooves 16 are in the shape of an inverted V. The two fixing posts 14 are respectively slidably connected through the inclined grooves 16 on the corresponding side movable blocks 15.

[0037] The miniature electric push rod 12 controls the movable push block 13 to move up and down within the fixed groove 10. When the movable push block 13 moves, it drives two movable blocks 15 to slide within the corresponding inclined grooves 16, and during the sliding process, it provides an outward pushing force to the two movable blocks 15, pushing them out along the moving groove 11 from the material inlet on the cylindrical shell. As the movable blocks 15 slide outward, the material collection bin 18 moves outward along with the movable blocks 15 and enters the surrounding rock and soil. When the material collection bin 18 separates from the cylindrical shell, the material collection bin 18 and the limiting block 19 can slide outward within the limiting groove 20 and the recess 17 under the action of the elastic force of the buffer spring 21, so that the rock and soil can fall into the material collection bin 18. The setting of the moving groove 11 can prevent the movable blocks 15 from deviating and getting stuck during movement, ensuring the stable movement of the movable blocks 15. The height of the fixed groove 10 is sufficient to allow the moving push block 13 to move up and down, and ensures that when the moving push block 13 moves to contact the moving block 15, the fixed column 14 slides down to the bottom of the inclined groove 16 on the moving block 15, and can completely push the groove 17 and the picking bin 18 at the end of the moving block 15 out of the moving groove 11, so that the picking bin 18 can be used to open the sampling.

[0038] The embodiment provides a shallow soil sampling device for geotechnical engineering investigation, such as Figure 1 As shown, a distance sensor 24 is provided at the bottom of the limiting lever 22. The control box 3 is electrically connected to the motor 4, the miniature electric push rod 12, and the electric hydraulic rod 23. The control box 3 sends start, stop, and speed adjustment commands to the motor 4. After the operator sets the operating parameters of the motor 4 on the control box 3, the control box 3 will transmit the corresponding electrical signals to the motor 4. The motor 4 starts working according to these signals, driving the telescopic shaft 5 and the rotating chuck 6 to rotate. At the same time, it controls the electric hydraulic rod 23 to work, driving the rotating chuck 6 and the spiral blade 7 to descend under the action of the telescopic shaft 5. The conical block 9 at the bottom of the spiral blade 7 extends into the soil layer, thereby enabling the spiral blade 7 and the conical block 9 to perform drilling operations. When the ranging sensor 24 detects that the spiral blade 7 and the conical block 9 have reached the predetermined drilling depth, it sends a signal back to the control box 3. Upon receiving this signal, the control box 3 issues a command to stop the motor 4 of the electric hydraulic rod 23 and simultaneously controls the miniature electric push rod 12 to push the moving push block 13, thereby causing the material collection bin 18 to unfold and perform soil collection. The control box 3 can precisely control the extension and retraction length of the electric hydraulic rod 23 based on the information fed back by the ranging sensor 24, thereby adjusting the height of the spiral blade 7 and the conical block 9 to ensure that the drilling depth meets the requirements.

[0039] In the embodiments, such as Figures 1 to 3As shown, the support base 2 is a 7-shaped support base, with its vertical support plate fixed to the bottom of the movable base 1. The motor 4 and the sampling mechanism are mounted on the horizontal support plate of the support base 2. Two elastic telescopic rods 25 are fixedly connected to the side of the vertical support plate adjacent to the horizontal support plate. The telescopic ends of the two elastic telescopic rods 25 are fixedly connected to the same cleaning brush 26, which abuts against the corresponding spiral blade 7. When the spiral blade 7 rotates and rises, the cleaning brush 26 cleans the spiral blade 7. The bottom of the movable base 1 is equipped with four self-locking casters 28, which facilitate the free movement of the movable base 1 and the movement and positioning of the device. After the operator pushes the device to the target soil sampling position, the self-locking casters 28 are locked to make the device stay stably in that position, preparing for subsequent soil sampling operations.

[0040] In this embodiment, the spiral blade 7 accelerates drilling, and the conical block 9 cuts through the soil layer, reducing resistance. The telescopic shaft 5 and the distance sensor 24 can monitor the drill bit depth in real time, and the control box automatically adjusts the speed of the motor 4 and the length of the telescopic shaft 5 to avoid drilling too deep or too shallow. The wedge-shaped sampling bin 18 is designed to reduce the compression deformation of the soil sample and maintain structural integrity. The buffer spring 21 and the limiting groove 20 can ensure that the sampling bin 18 buffers the impact during sliding contact, preventing the sample from breaking. The electric hydraulic rod 23 can automatically adjust the drill bit pressure, replacing the traditional mechanical linkage and reducing manual intervention. The micro electric push rod 12 can precisely control the opening and closing of the sampling bin, avoiding the need for manual adjustment of the pins and screw sleeves. The cleaning brush 26 and the elastic telescopic rod 25 can automatically clean the attached soil when the drill bit rotates, extending its service life. The self-locking universal wheel 28 can move flexibly, adapt to complex terrain, and reduce transportation difficulty.

[0041] The working process of the shallow soil sampling device for geotechnical engineering investigation in this embodiment is as follows:

[0042] First, the entire device is moved to the sampling location by the movable base 1, aligning the sampling port 27 on the movable base with the sampling point. The self-locking casters 28 are then locked to secure the device in this position, preparing it for subsequent soil sampling. After the device is in place, the motor 4 is started by the control box 3. The motor 4 drives the telescopic shaft 5 and the rotating chuck 6 to rotate synchronously, which in turn causes the spiral blade 7 connected to the rotating chuck 6 to rotate. At the same time, the electro-hydraulic rod 23 operates, pushing the limit rod 22, the rotating chuck 6, and the spiral blade 7 downwards. At this time, the telescopic shaft 5 is in an extended state, and during the rotation of the spiral blade 7, the conical block 9 at its bottom acts as a guide, helping the spiral blade 7 to smoothly drill into the shallow soil and rock. During the drilling process, a distance sensor 24 is installed at the bottom of the limit rod 22, which can measure the drilling depth of the device in real time and feed the data back to the control box 3.

[0043] When the preset soil sampling depth is reached, the control box 3 controls the electric hydraulic rod 23 to stop descending, ensuring that the soil sampling depth meets the exploration requirements. Then, the control box 3 activates the micro electric push rod 12, which pushes the movable push block 13 downward within the fixed groove 10. Meanwhile, the fixed column 14 within the movable push block 13 slides within the inclined groove 16 of the movable block 15. Due to the inclined design of the inclined groove 16, the sliding of the fixed column 14 causes the two movable blocks 15 to slide outward relative to each other within the two movable grooves 11. Figure 10 As shown, when the moving block 15 slides outward, the material collection bin 18 moves outward along with the moving block 15 and enters the surrounding rock and soil. When the material collection bin 18 separates from the cylindrical shell, the material collection bin 18 and the limiting block 19 can slide outward in the limiting groove 20 and the groove 17 under the action of the elastic force of the buffer spring 21, so that the rock and soil can fall into the material collection bin 18. After the soil collection operation is completed, the micro electric push rod 12 is started in reverse, which can drive the moving push block 13 to move upward in the fixed groove 10. Because the material collection bin 18 is wedge-shaped, under the action of the cylindrical shell, the material collection bin 18 can re-squeeze the buffer spring 21, drive the limiting block 19 to re-lock into the groove 17 and the limiting groove 20, and then enter the cylindrical shell through the moving groove 11.

[0044] Then, the control box 3 controls the electric hydraulic rod 23 to retract, driving the rotating chuck 6, the spiral blade 7, and the material collection bin 18 to rise. After that, the micro electric push rod 12 can be restarted, so that the above operation can be repeated. Finally, the soil collection bin is pushed out of the conical block 9, which facilitates the subsequent analysis and testing of the soil and rock samples. During the rising process, the elastic telescopic rod 25 in the support seat 2 pushes the cleaning brush 26 to contact the spiral blade 7. The cleaning brush 26 can clean the soil and rock adhering to the spiral blade 7, so as to avoid the soil and rock accumulating on the spiral blade 7 and affecting the next use.

[0045] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A shallow soil sampling device for geotechnical engineering investigation, characterized in that: The device includes a movable base (1), a support base (2) is fixedly connected to the top of the movable base (1), a sampling mechanism is provided on the support base (2), and a sampling port (27) is opened on the movable base (1). The sampling mechanism includes a motor (4), a spiral blade (7), a lifting component, a moving component and a sampling component. The motor (4) is fixedly connected to the support base (2), a telescopic shaft (5) is fixedly connected to the bottom end of the motor (4), a rotating chuck (6) is fixedly connected to the bottom of the telescopic shaft (5), and the spiral blade (7) is fixedly connected to the bottom of the rotating chuck (6) and faces the sampling port (27). The telescopic shaft (5), the rotating chuck (6) and the spiral blade (7) are rotated as a whole by the motor (4). The lifting assembly includes an electric hydraulic rod (23) arranged parallel to one side of the spiral blade (7). The bottom end of the electric hydraulic rod (23) is fixedly connected to the top surface of the movable seat (1). A limit rod (22) is sleeved inside the rotating chuck (6). One end of the limit rod (22) is rotatably connected to the outside of the rotating chuck, and the other end of the limit rod (22) extends horizontally to the top of the electric hydraulic rod (23) and is connected to the piston end of the electric hydraulic rod (23). The rotating chuck (6) is controlled by the electric hydraulic rod (23) to drive the spiral blade (7) to rise and fall. The spiral blade (7) has a cavity (8) inside its rotating shaft. A sampling component is fixedly connected to the bottom of the spiral blade (7). The sampling component includes an outer shell, a conical block (9) fixedly connected to the bottom of the outer shell, and a material-taking component disposed inside the outer shell. The outer shell has a fixed groove (10) and a moving groove (11) that communicate with each other. The fixed groove (10) communicates with the cavity (8). The material-taking component is slidably installed in the moving groove (11), and a corresponding opening is provided on the side of the outer shell at a position corresponding to the moving groove (11). 1) A connected material inlet; the moving component includes a miniature electric push rod (12) fixedly connected in the cavity (8), the bottom of the miniature electric push rod (12) extending into the fixed groove (10) of the outer shell, and a moving push block (13) fixedly connected to its bottom, the moving push block (13) slidingly placed in the fixed groove (10) and connected to the material inlet; under the action of the miniature electric push rod (12), the moving push block (13) moves down to push the material inlet to slide outward along the moving groove (11) and to take a sample through the material inlet extending out of the outer shell; The material handling assembly includes a movable block (15) slidably connected within a movable groove (11). A groove (17) is provided at one end of the movable block (15) near the corresponding material handling port, and a material handling bin (18) is slidably connected within the groove (17). Each movable block (15) has two grooves (17) symmetrically distributed at one end of the movable block (15) near the material handling port. A material handling bin (18) is slidably connected within each groove (17). Limiting blocks (19) are fixedly connected to the upper and lower sides of each material handling bin (18). Limiting grooves (20) are provided on both sides below. The limiting block (19) of the feeding bin (18) is slidably placed in the corresponding limiting groove (20). A buffer spring (21) is fixedly connected in each limiting groove (20). The other end of the buffer spring (21) is connected to the corresponding limiting block (19). When the buffer spring (21) is in the contracted state, the feeding bin (18) is completely placed in the corresponding groove (17) and slides against the moving groove (11). The feeding bin (18) is wedge-shaped. When the buffer spring (21) is in the extended state, the feeding bin (18) extends out of the groove (17). The bottom of the limiting lever (22) is provided with a distance sensor (24), and the support base (2) is provided with a control box (3). The signal output end of the distance sensor (24) is connected to the signal input end of the control box (3). The control box (3) is electrically connected to the motor (4), the micro electric push rod (12), and the electric hydraulic rod (23) respectively.

2. The shallow soil sampling device for geotechnical engineering investigation according to claim 1, characterized in that: Two movable slots (11) are provided, symmetrically arranged on both sides below the fixed slot (10). The two movable slots are respectively connected to the fixed slot (10), and a material picking component is provided in each of the two movable slots (11). The outer shell is cylindrical, and two material picking ports are symmetrically provided on its side. Two fixed columns (14) are symmetrically provided at the bottom of the movable push block (13). Inclined slots (16) are opened in both movable blocks (15). The two inclined slots (16) are distributed in an inverted V-shape. Each fixed column (14) is slidably connected to the inclined groove (16) on the corresponding side moving block (15); when the moving push block (13) moves down, it slides in the inclined groove (16) through the fixed column (14), thereby pushing the moving block (15) out of the feeding port along the moving groove (11), and when the moving push block (13) descends and contacts the top surface of the moving block (15), the fixed column (14) slides to the bottom of the inclined groove (16), and the moving block (15) extends out of the corresponding feeding port.

3. A shallow soil sampling device for geotechnical engineering investigation according to claim 1 or 2, characterized in that: The support base (2) is a 7-shaped support base. The bottom of the vertical support plate of the support base (2) is fixed on the movable base (1). The motor (4) and the sampling mechanism are installed on the horizontal support plate of the support base (2). Two elastic telescopic rods (25) are fixedly connected on the side of the vertical support plate near the horizontal support plate. The telescopic ends of the two elastic telescopic rods (25) are fixedly connected to the same cleaning brush (26). The cleaning brush (26) abuts against the outside of the corresponding spiral blade (7).

4. A shallow soil sampling device for geotechnical engineering investigation according to claim 1 or 2, characterized in that: The bottom of the movable seat (1) is provided with four self-locking casters (28).

5. A shallow soil sampling device for geotechnical engineering investigation according to claim 1 or 2, characterized in that: The bottom end of the electric hydraulic rod (23) is fixedly connected to the top of the movable seat (1), the cross-section of the rotating chuck (6) is concave, and the limiting chuck rod (22) is rotatably connected to the outside of the rotating chuck.

6. A shallow soil sampling device for geotechnical engineering investigation according to claim 2, characterized in that: The movable push block (13) is an inverted concave block, and two fixed posts (14) are respectively set at the bottom of the movable push block (13).

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