Hydraulic engineering construction rock-soil sampling device and method

Abstract

The application discloses a kind of water conservancy construction geotechnical sampling device and method, it is related to soil detection sampling technical field, including base, lifting mechanism, sampling execution mechanism;Sampling execution mechanism includes sampling column, drive assembly and inlay strip, sampling jaw;Drive assembly is used to drive sampling jaw swing;Inlay strip can be moved to outside relative to sampling jaw, to extrude soil at the edge of sampling jaw to outside displacement.The application in the process of jaw convergence, adjacent permanent magnet on inlay strip attract each other, drive inlay strip to move to outside.This action will be extruded soil at the edge of jaw to outside shear, displacement, so that disturbed soil is located at the outside of sampling jaw.Finally, the sample left in the inside of sampling jaw is substantially not subjected to lateral extrusion force, so as to maintain the original density, porosity and permeability of soil, ensure the reliability of detection data, reduce edge soil extrusion, maintain the physical properties of sample as is.

Description

Technical Field

[0001] This invention relates to the field of soil testing and sampling technology, specifically to a soil and rock sampling device and method for water conservancy engineering construction. Background Technology

[0002] Water conservancy projects refer to engineering projects constructed to control, regulate, and protect surface water and groundwater in nature to achieve the goals of mitigating harm and promoting benefits. Before and during the construction of water conservancy projects, soil sampling and testing (commonly known as "geotechnical testing" or "rock and soil investigation") is a crucial step. Simply put, this is like a doctor conducting a physical examination before performing surgery on a patient; only by fully understanding the condition of the "foundation" (soil) can the project be "prescribed appropriately," ensuring safety and cost-effectiveness.

[0003] Currently, soil sampling equipment can be broadly categorized into the following types:

[0004] 1. Screwdriver-type sampling equipment: This type of equipment uses a rotating screwdriver structure to bring soil to the surface for collection. However, this method can cause soil from different depths to become mixed, thus affecting the sampling accuracy.

[0005] 2. Grip-type sampling device: This device can be inserted into a specific depth of soil layer, and then the grippers will pick up the soil from the selected depth and remove it from the ground, resulting in high sampling accuracy. However, because the grippers are forcibly inserted into the soil when picking it up, the soil on the side edges of the grippers may be squeezed during this process, leading to an increase in sample density, which cannot accurately reflect the porosity and permeability of the soil. Summary of the Invention

[0006] The purpose of this invention is to provide a soil and rock sampling device and method for water conservancy engineering construction, 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 and rock sampling device for water conservancy engineering construction, comprising a base, a lifting mechanism disposed on the base, and a sampling execution mechanism connected to the output end of the lifting mechanism;

[0008] The sampling actuator includes a sampling column, a drive assembly, and a strip;

[0009] The lower end of the sampling column is hinged with multiple sampling grippers arranged in a circumferential array.

[0010] The driving component is disposed on the sampling column and is used to drive the plurality of sampling grippers to swing relative to the hinge of the sampling column.

[0011] The insert is movably mounted on the sampling jaws. During the closing of the multiple sampling jaws, the insert can move outward relative to the sampling jaws to push the soil that is being squeezed at the edge of the sampling jaws outward.

[0012] Furthermore, the sampling gripper has a receiving cavity on its side, the insert slides and engages in the receiving cavity, and a permanent magnet is embedded in the insert, with the magnetic poles of the opposite faces of the two adjacent permanent magnets on the two adjacent sampling grippers being opposite.

[0013] Furthermore, a connecting shaft is fixed on the insert, and a placement hole is provided in the sampling jaw. The end of the connecting shaft away from the insert extends into the placement hole, and a fixing ring is fixed at the opening of the placement hole. The connecting shaft slides through the fixing ring and is keyed to the fixing ring.

[0014] Furthermore, a stop ring is fixed at one end of the connecting shaft located in the mounting hole, and a return spring is sleeved on the connecting shaft. The return spring is located between the stop ring and the fixed ring. The return spring is used to apply elastic force to the stop ring, so that the insert has a tendency to move and return to the receiving cavity inside the sampling claw.

[0015] Furthermore, the drive assembly includes a cylinder, a connecting column, a tie rod, a movable part, and a hinge rod;

[0016] The sampling column has a sliding cavity and an installation cavity inside. The cylinder is installed at the upper end of the sampling column, and its output end is connected to the connecting column. The connecting column is slidably disposed in the sliding cavity.

[0017] One end of the pull rod is fixed to the connecting column, and the other end passes through the sampling column and extends into the mounting cavity to connect with the movable part.

[0018] The hinge rod is hinged between the movable part and the inner wall of the sampling gripper. The cylinder drives the movable part to move through the connecting column and the pull rod, and then drives the sampling gripper to swing through the hinge rod.

[0019] Furthermore, the lifting mechanism includes a column, a ball screw, a lifting part, and a servo motor;

[0020] The column is vertically installed on the base, and a mounting plate is connected to one side of the column;

[0021] The ball screw is vertically rotatably connected to the mounting plate, and the servo motor is connected to drive the ball screw.

[0022] A lead screw nut is installed on the lifting part, and the lead screw nut cooperates with the ball screw. The sampling actuator is connected to the lifting part through a mounting arm.

[0023] Furthermore, the mounting plate is provided with a protrusion, and the lifting part is provided with a limit groove. The protrusion and the limit groove are slidably engaged to restrict the lifting part from rotating with the ball screw.

[0024] Furthermore, a guide sleeve is installed on the base, and a guide hole is provided on the guide sleeve. The sampling column passes through the guide hole and slides in cooperation with the guide hole.

[0025] A method for soil and rock sampling during water conservancy engineering construction, applied to the sampling device described above, includes the following steps:

[0026] S1: The device is in place. Move the sampling device to the sampling position and make the multiple sampling jaws close together.

[0027] S2: Press into the soil, drive the lifting mechanism to move the sampling column and the closed sampling claws downward, inserting into the soil to the preset depth;

[0028] S3: Expansion preparation, drive the lifting mechanism to move the sampling gripper upwards and fine-tune the distance so that the bottom of the sampling gripper leaves the predetermined sampling area of ​​the soil. Then start the drive component to expand the sampling gripper.

[0029] S4: Press down again, drive the lifting mechanism to move the unfolded sampling gripper down to the predetermined sampling depth, and the sampling gripper opens in the sampling area;

[0030] S5: Grab the sample. Start the drive component to drive the sampling gripper to close inward. During the closing process, use the strip to push the squeezed soil outward and grab the target sample.

[0031] S6: Lift and remove the sample. The lifting mechanism drives the sampling jaws holding the sample to move upward and remove the sample.

[0032] Furthermore, in step S5, during the process of the sampling claws closing inward, when adjacent sampling claws approach each other to a certain distance, the insert moves outward to the outside of the gap between the two adjacent sampling claws, shearing and pushing the soil located at the edge of the gap between the sampling claws outward.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] 1. In this invention, during the clamping process, the permanent magnets on adjacent inserts attract each other, driving the inserts to move outward. This action shears and pushes the soil compressed at the edge of the clamp outward, placing the disturbed soil outside the sampling clamp. The sample remaining inside the sampling clamp is essentially unaffected by lateral pressure, thus maintaining the soil's original density, porosity, and permeability, ensuring the reliability of the test data, reducing edge soil compression, and preserving the original physical properties of the sample.

[0035] 2. In this invention, compared with the "spiral auger" sampling device, this device adopts the method of inserting the sampling claws into a specific depth to directly grab the soil, which avoids the mutual mixing of soil at different depths during the lifting process, thereby significantly improving the accuracy and authenticity of the sampling.

[0036] 3. In this invention, the lifting mechanism adopts a transmission method of servo motor combined with ball screw and screw nut. Compared with ordinary cylinder or hydraulic lifting, it has the advantages of high transmission accuracy, smooth lifting, and easy control of sampling depth. Combined with the anti-rotation design of convex strip and limit slot, it ensures that no circumferential deflection will occur during the sampling process. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of a soil and rock sampling device for water conservancy engineering construction according to the present invention;

[0038] Figure 2 for Figure 1 A diagram illustrating the positional relationship from another perspective;

[0039] Figure 3 for Figure 2 A magnified schematic diagram of the positional relationship of a local structure at point A in the middle;

[0040] Figure 4 This is a schematic diagram showing the positional relationship of the sampling column, cylinder, and sampling gripper after assembly in this invention.

[0041] Figure 5 for Figure 4 A schematic diagram showing the positional relationship of the middle section after it has been cut open;

[0042] Figure 6 for Figure 5 A magnified schematic diagram of the positional relationship of the local structure at point B in the middle section;

[0043] Figure 7 This is a schematic diagram showing the positional relationship of the sampling claw, the insert, and the permanent magnet after assembly in this invention;

[0044] Figure 8 for Figure 7 Schematic diagram of the positional relationships of the central structure after explosive decomposition;

[0045] Figure 9 for Figure 8 A magnified schematic diagram of the positional relationship of the local structure at point K.

[0046] The following are the annotations for each part of the figure: 1. Base; 2. Column; 3. Ball screw; 4. Lifting part; 5. Servo motor; 6. Cylinder; 7. Mounting arm; 8. Sampling column; 9. Mounting plate; 10. Sampling gripper; 11. Guide sleeve; 12. Clearance hole; 13. Protrusion; 14. Screw nut; 15. Connecting column; 16. Sliding cavity; 17. Pull rod; 18. Mounting cavity; 19. Hinge rod; 20. Moving part; 21. Side; 22. Permanent magnet; 23. Inlay; 24. Receiving cavity; 25. Mounting hole; 26. Stop ring; 27. Connecting shaft; 28. Return spring; 29. ​​Fixing ring. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] Please see Figures 1-9 This invention provides a technical solution: a soil and rock sampling device for water conservancy engineering construction, comprising a base 1 with multiple rollers installed at the bottom for movement on the ground, a column 2 vertically mounted on the top of the base 1, an mounting plate 9 vertically connected to one side of the column 2, and multiple reinforcing plates fixedly connected to the top of the base 1 for reinforcement of the column 2. A lifting part 4 is vertically slidably connected to the surface of the mounting plate 9, bearing seats are installed at both the upper and lower ends of the mounting plate 9, and a ball screw 3 is vertically rotatably connected to both bearing seats. A motor plate is fixedly connected to the top of the mounting plate 9, and a servo motor 5 is mounted on the motor plate. The motor shaft of the servo motor 5 is drivenly connected to the upper end of the ball screw 3 via a coupling. A screw nut 14 is installed on the lifting part 4 and fitted onto the ball screw 3. The periphery of the servo motor 5 is connected to the ball screw 3 in a rolling helical transmission. When the motor shaft of the servo motor 5 rotates, it will drive the ball screw 3 to rotate through the coupling. Then, through the rolling helical transmission between the ball screw 3 and the screw nut 14, the lifting part 4 can be driven to move vertically. Specifically, the mounting plate 9 has a protruding rib 13 fixed to the side surface facing the lifting part 4. The periphery of the lifting part 4 is provided with a notch-shaped limiting groove. The protruding rib 13 is engaged in the limiting groove and forms a sliding fit with the limiting groove. This allows the lifting part 4 to move vertically when the ball screw 3 rotates and drives the screw nut 14 to move, and the protruding rib 13 to slide relative to the inner wall of the limiting groove. When the lifting part 4 moves vertically, it will not rotate with the screw nut 14 along the circumference of the ball screw 3.

[0049] Combination Figures 1 to 3 As shown, and please refer to the following: Figure 3 A mounting arm 7 is horizontally fixed to the periphery of the lifting part 4. A sampling column 8 is vertically mounted on the end of the mounting arm 7 away from the lifting part 4. The axial direction of the sampling column 8 is parallel to the moving direction of the lifting part 4. Multiple sampling claws 10 are hinged to the lower end of the sampling column 8. The multiple sampling claws 10 are arranged in an array along the axial direction of the sampling column 8. The sampling claws 10 are wider at the top and narrower at the bottom, and the side of the sampling claws 10 facing the radially outer side of the sampling column 8 is arc-shaped. When the multiple sampling claws 10 rotate to a close position at the hinge point with the sampling column 8, the maximum outer diameter of the structure formed by the multiple sampling claws 10 matches the outer diameter of the sampling column 8, and the lower end is conical so that it can be inserted into (relatively loose) soil. In addition, the base 1 is provided with a clearance hole 12 for the sampling column 8 to pass freely. Figure 6 As shown, the sampling column 8 has a blind hole-shaped mounting cavity 18 at its lower end. A movable part 20 is movably arranged in the mounting cavity 18. The movable part 20 can slide freely along the axial direction of the sampling column 8 in the mounting cavity 18. In addition, multiple hinge rods 19 are hinged to one end face of the movable part 20 facing the sampling claw 10. The number of hinge rods 19 matches the number of sampling claws 10, and the lower end of the hinge rod 19 (or the end away from the sampling claw 10) is correspondingly hinged to the inner wall of the sampling claw 10 (the side wall facing the radially inner side of the sampling column 8). Thus, when the movable part 20 moves up and down, the hinge rods 19 drive the sampling claw 10 to rotate along the hinge point with the sampling column 8, so that the multiple sampling claws 10 can change to an unfolded or retracted state.

[0050] Combination Figures 1 to 6 As shown, and please refer to the following: Figure 3 and Figure 5A cylinder 6 is vertically mounted on the upper end of the sampling column 8. The cylinder rod of the cylinder 6 drives a connecting column 15. A blind-hole sliding cavity 16 is opened at the upper end of the sampling column 8. The connecting column 15 is coaxially engaged in the sliding cavity 16 and can slide freely along the axial direction of the sampling column 8 within the sliding cavity 16. In addition, a pull rod 17 is fixedly connected to the lower end of the connecting column 15. The pull rod 17 slides through the sampling column 8, and the lower end of the pull rod 17 passes into the mounting cavity 18 and is fixedly connected to the upper end face of the movable part 20. This allows the connecting column 15 to slide within the sliding cavity 16 when the cylinder rod of the cylinder 6 extends or retracts. Consequently, the pull rod 17 drives the movable part 20 to slide within the mounting cavity 18, thereby enabling the hinge rod 19 to drive the sampling gripper 10 to rotate. Additionally, the base... The top of 1 is vertically connected to the guide sleeve 11 by screws. The guide sleeve 11 has a through hole, which allows the sampling column 8 to move freely. The diameter of the guide hole matches the outer diameter of the sampling column 8, so that when the sampling column 8 slides in the guide hole, the wall of the sampling column 8 slides relative to the guide hole. The guide hole guides and limits the sampling column 8. When the motor shaft of the servo motor 5 rotates, the ball screw 3 and the screw nut 14 roll the helical transmission and drive the lifting part 4, the mounting arm 7 and the sampling column 8 to move downward. The sampling gripper 10 closes and inserts into the soil. The guide hole guides and limits the sampling column 8, thereby preventing stress concentration at the connection between the sampling column 8 and the mounting arm 7.

[0051] Combination Figures 7 to 9 As shown, and please refer to the following: Figure 8The sampling grippers 10 have recessed receiving cavities 24 on their sides 21. A strip 23 is fitted into each receiving cavity 24. When the strip 23 is fully engaged within the receiving cavity 24, its surface is flush with the side 21. The strip 23 can slide freely within the receiving cavity 24. A permanent magnet 22 is embedded on the side of the strip 23 facing outwards from the sampling grippers 10. The surface of the permanent magnet 22 is flush with the surface of the strip 23. The magnetic poles of adjacent permanent magnets 22 on adjacent sampling grippers 10 are aligned, meaning the opposite magnetic poles of the opposing surfaces of adjacent permanent magnets 22 are opposite. Thus, when the two sampling grippers 10 are brought closer together, the two permanent magnets 22 interact with each other. The attraction drives the two corresponding inserts 23 to move closer together. At least one connecting shaft 27 is vertically fixedly connected to each insert 23. A blind-hole mounting hole 25 is provided in the sampling gripper 10. The end of the connecting shaft 27 away from the insert 23 extends into the mounting hole 25. A retaining ring 29 is fixedly connected to the opening of the mounting hole 25. The connecting shaft 27 passes through the annular hole of the retaining ring 29, and the annular hole of the retaining ring 29 is keyed to the connecting shaft 27. This allows the connecting shaft 27 to slide within the annular hole of the retaining ring 29, and due to the limiting effect of the keyed connection, the connecting shaft 27 will not rotate circumferentially, thus preventing the inserts 23 from... Rotation will occur. A stop ring 26 is fixedly fitted onto one end of the connecting shaft 27 that passes through the mounting hole 25. The stop ring 26 can slide freely within the mounting hole 25. A return spring 28 is wound around the periphery of the connecting shaft 27. The return spring 28 is located between the stop ring 26 and the fixed ring 29, and its two ends in the direction of elastic force elastically abut against the end faces of the stop ring 26 and the fixed ring 29, respectively. In its natural state, the return spring 28 exerts a preload on the stop ring 26, thereby causing the stop ring 26 to drive the connecting shaft 27 to move, and causing the insert 23 to engage within the receiving cavity 24. The receiving cavity 24 covers at least four-fifths of the surface area of ​​the side 21. When the two sampling clamps... When the claw 10 moves to a certain position, the two adjacent permanent magnets 22 attract each other, which in turn drives the two corresponding inserts 23 to move closer to each other. The inserts 23 will drive the connecting shaft 27 to move outward from the sampling claw 10, and cause the stop ring 26 to compress the return spring 28. The return spring 28 is then compressed and accumulates elastic potential energy. When the sampling claw 10 is unfolded, and the distance between the two adjacent permanent magnets 22 is far, the magnetic attraction force on the insert 23 disappears. At this time, the elastic potential energy accumulated by the return spring 28 will be released, which will drive the stop ring 26 to move inward from the sampling claw 10, and allow the insert 23 to be fully engaged in the receiving cavity 24.

[0052] Working principle of the invention:

[0053] Move the base 1 to the construction position of the sampling area, place several counterweights on the base 1, and lock the rollers to prevent the base 1 from moving on its own. At this time, the sampling gripper 10 is in a closed position. Start the servo motor 5. The motor shaft of the servo motor 5 rotates in the forward direction, thereby driving the ball screw 3 to rotate. When the ball screw 3 rotates, it will roll the screw nut 14, causing the screw nut 14 to move downward on the periphery of the ball screw 3, thereby driving the mounting arm 7 and the sampling column 8 to move downward. When the sampling column 8 moves downward, the sampling column 8 and the sampling gripper 10 will pass through the guide hole of the guide sleeve 11, and the sampling gripper 10 will be inserted into the soil. Since the soil is relatively loose, the sampling gripper 10 can be inserted to a specified depth and form a sampling hole in the soil.

[0054] After reaching the sampling depth, the motor shaft of the servo motor 5 rotates in the opposite direction several times, so that the position of the sampling gripper 10 is slightly higher than the sampling depth. Then, the cylinder 6 is activated, and the cylinder rod of the cylinder 6 extends, thereby driving the connecting column 15 to move downward in the sliding cavity 16. When the connecting column 15 moves downward, the pull rod 17 will also move downward synchronously. When the pull rod 17 moves downward, it can drive the movable part 20 to move downward. The hinge rod 19 will generate a driving force on the sampling gripper 10, causing the sampling gripper 10 to swing along the hinge point with the lower end of the sampling column 8, so that multiple sampling grippers 10 swing in the radial outward direction of the sampling column 8 and are in an unfolded state. When in the closed state, although the two adjacent permanent magnets 22 have magnetic attraction, causing the inserts 23 to have a tendency to move closer to each other, because the sampling grippers 10 are closed, the opposite surfaces of the two adjacent inserts 23 are also squeezed together. Therefore, the two inserts 23 are still locked in the receiving cavity 24.

[0055] When the sampling gripper 10 unfolds, the outer surface of the sampling gripper 10 is squeezed against the soil, causing the soil to be subjected to a squeezing force away from the sampling column 8. Since the sampling gripper 10 is positioned above the sampling depth at this time, the lower end of the sampling gripper 10 will not be squeezed against the soil. Therefore, the insert 23 will not be subject to soil resistance at this time. During the process of the sampling gripper 10 unfolding into place, the distance between the two adjacent permanent magnets 22 gradually increases, causing the return spring 28 to exert an elastic resisting force on the stop ring 26. This allows the insert 23 to engage with the motor shaft of the servo motor 5 and rotate forward again, thereby causing the sampling gripper 10 to move downward. The sampling gripper 10 begins to grip the soil at the bottom of the sampling hole. In addition, the lower half of the sampling gripper 10 participates in the gripping, while the upper half does not participate in the gripping. The sampling gripper 10 forms a sampling pit at the bottom of the sampling hole.

[0056] During clamping, the sides 21 and inserts 23 of the sampling claws 10 exert shear forces on the soil near adjacent surfaces. The soil located inside the sampling claws 10 is largely unaffected by shear forces, thus maintaining good sample density, porosity, and permeability. It is necessary to retain the soil in these locations. When the sampling claws 10 approach a certain position, the two adjacent permanent magnets 22 on the adjacent sampling claws 10 attract each other. Under the influence of magnetic attraction, the two permanent magnets 22 move rapidly closer to each other, which in turn moves the inserts 23 closer together. This causes the return spring 28 to be subjected to the elastic resistance of the stop ring 26. As the inserts 23 move closer together, they push away the soil between the surfaces and sides 21 of the adjacent inserts 23, keeping the soil subjected to shear forces as far away from the sampling claws 10 as possible. Located on the outside of the sampling gripper 10, the sampling gripper 10 is not fully closed at this time. The servo motor 5 is started again, and the motor shaft of the servo motor 5 rotates in the opposite direction, causing the sampling gripper 10 to begin to move upward. During the upward movement, the cylinder rod of the cylinder 6 continues to shorten, causing the sampling gripper 10 to continue to close. However, during this closing process, the lower end of the sampling gripper 10 is removed from the sampling pit, while the soil sample in the inner area of ​​the sampling gripper 10 remains inside the sampling gripper 10. As the sampling gripper 10 continues to close, these samples will remain inside the sampling gripper 10, thus minimizing the impact of shear force on the sample. In addition, when the sampling gripper 10 is not fully closed and is removed from the sampling pit, the insert 23 may experience some soil resistance, but because the soil is relatively loose, it will not cause damage to the insert 23.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A soil and rock sampling device for water conservancy engineering construction, characterized in that, It includes a base (1), a lifting mechanism disposed on the base (1), and a sampling execution mechanism connected to the output end of the lifting mechanism; The sampling actuator includes a sampling column (8), a drive assembly, and a strip (23). The lower end of the sampling column (8) is hinged with a plurality of sampling claws (10) arranged in a circumferential array. The driving component is disposed on the sampling column (8) and is used to drive the plurality of sampling claws (10) to swing relative to the hinge of the sampling column (8); The insert (23) is movably mounted on the sampling claw (10). During the process of multiple sampling claws (10) closing together, the insert (23) can move outward relative to the sampling claw (10) to push the soil squeezed at the edge of the sampling claw (10) outward.

2. The device according to claim 1, characterized in that, The sampling gripper (10) has a receiving cavity (24) on its side (21). The insert (23) slides and engages in the receiving cavity (24). The insert (23) is embedded with a permanent magnet (22). The magnetic poles of the opposite faces of the two adjacent permanent magnets (22) on the two adjacent sampling grippers (10) are opposite.

3. The device according to claim 2, characterized in that, A connecting shaft (27) is fixed on the insert (23). A placement hole (25) is provided in the sampling gripper (10). The end of the connecting shaft (27) away from the insert (23) extends into the placement hole (25). A fixing ring (29) is fixed at the opening of the placement hole (25). The connecting shaft (27) slides through the fixing ring (29) and is keyed to the fixing ring (29).

4. The device according to claim 3, characterized in that, A stop ring (26) is fixed at one end of the connecting shaft (27) located in the mounting hole (25). A return spring (28) is sleeved on the connecting shaft (27). The return spring (28) is located between the stop ring (26) and the fixing ring (29). The return spring (28) is used to apply elastic force to the stop ring (26), so that the insert (23) tends to move and reset into the receiving cavity (24) inside the sampling claw (10).

5. The device according to claim 1, characterized in that The drive assembly includes a cylinder (6), a connecting column (15), a pull rod (17), a movable part (20), and a hinge rod (19). The sampling column (8) has a sliding cavity (16) and an installation cavity (18) inside. The cylinder (6) is installed on the upper end of the sampling column (8), and its output end is connected to the connecting column (15). The connecting column (15) is slidably disposed in the sliding cavity (16). One end of the pull rod (17) is fixed to the connecting column (15), and the other end passes through the sampling column (8) and extends into the mounting cavity (18) to connect with the movable part (20); The hinge rod (19) is hinged between the movable part (20) and the inner wall of the sampling gripper (10). The cylinder (6) drives the movable part (20) to move through the connecting column (15) and the pull rod (17), and then drives the sampling gripper (10) to swing through the hinge rod (19).

6. The device according to claim 1, wherein The lifting mechanism includes a column (2), a ball screw (3), a lifting part (4), and a servo motor (5). The column (2) is vertically installed on the base (1), and a mounting plate (9) is connected to one side of the column (2). The ball screw (3) is vertically rotatably connected to the mounting plate (9), and the servo motor (5) drives the ball screw (3). A lead screw nut (14) is installed on the lifting part (4), and the lead screw nut (14) cooperates with the ball screw (3). The sampling execution mechanism is connected to the lifting part (4) through the mounting arm (7).

7. The device according to claim 6, characterized in that, The mounting plate (9) is provided with a protrusion (13), and the lifting part (4) is provided with a limit slot. The protrusion (13) slides with the limit slot to restrict the lifting part (4) from rotating with the ball screw (3).

8. The device according to claim 1, characterized in that, A guide sleeve (11) is installed on the base (1), and a guide hole is provided on the guide sleeve (11). The sampling column (8) passes through the guide hole and slides in cooperation with the guide hole.

9. A method of sampling a ground mass for hydraulic engineering construction, applied to the sampling device according to any one of claims 1 to 8, characterized in that, Includes the following steps: S1: The device is in place. The sampling device is moved to the sampling position and the multiple sampling grippers (10) are in a closed state. S2: Press into the soil, drive the lifting mechanism to move the sampling column (8) and the closed sampling claws (10) downwards, and insert into the soil to the preset depth; S3: Expansion preparation, drive the lifting mechanism to move the sampling gripper (10) upward to make a fine adjustment distance, so that the bottom of the sampling gripper (10) leaves the predetermined sampling area of ​​the soil, and then start the drive component to unfold the sampling gripper (10); S4: Press down again, drive the lifting mechanism to move the unfolded sampling gripper (10) down to the predetermined sampling depth, and the sampling gripper (10) opens in the sampling area; S5: Grab the sample, start the drive component to drive the sampling gripper (10) to close inward. During the closing process, use the strip (23) to push the squeezed soil outward and grab the target sample. S6: Lift and remove the sample. Drive the lifting mechanism to move the sampling claw (10) holding the sample upward and remove the sample.

10. The method according to claim 9, wherein In step S5, during the process of the sampling claws (10) closing inward, when the adjacent sampling claws (10) approach each other to a certain distance, the strip (23) moves to the outside of the gap between the two adjacent sampling claws (10), and shears and pushes the soil located at the edge of the gap between the sampling claws (10) outward.

Images