A sand sampler for geotechnical investigation

Abstract

The utility model belongs to the technical field of survey equipment, specifically discloses a sand extractor for geotechnical investigation. The fixed cylinder of the sand extractor is a vertical empty cylinder with open ends, the charging hopper is fixed at the top end of the fixed cylinder, the sampling cylinder is a hollow cylinder with an open top and is fixed at the top end to the fixed cylinder, the separation cylinder is a hollow cylinder with an open top and is provided with a plurality of groups of filter holes with different hole diameters on the side wall, the separation cylinder is suspended in the fixed cylinder and is fixed at the top end to the upper part of the inner wall of the fixed cylinder, the lifting cylinder is a hollow cylinder with an open top and is provided with a discharge window hole on the lower part of the side wall, the lifting adjusting assembly is arranged in the charging hopper and extends upward out of the charging hopper at the top end, and the lifting adjusting assembly is connected to the lifting cylinder to drive the lifting cylinder to lift up and down and rotate. The utility model realizes the adjustment and adaptation of the filter holes in the lifting cylinder and the separation cylinder through the cooperation of the lifting cylinder and the separation cylinder, thereby realizing the separate filtration and extraction of different specifications of sand and gravel in the geotechnical sample, and has the characteristics of simple structure, convenient use and high separation efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of exploration equipment technology, specifically relating to a sand extractor for rock and soil exploration that is simple in structure, easy to use, and has high separation efficiency. Background Technology

[0002] Rock and soil exploration sampling is a means and technique used to ascertain the basic characteristics and spatial distribution of subsurface rock masses or adverse geological conditions. It is usually done by taking samples on-site.

[0003] Currently, in the process of geotechnical exploration sampling, the sample mixture (including geotechnical samples and soil particles) extracted by sampling equipment is brought into the laboratory for further processing (separation, etc.). While this process ensures the original state of the geotechnical sample, the large volume occupied by soil particles and other impurities in the sample mixture can lead to a large number of samples if there are many exploration points. The large volume of the sample mixture can become a significant burden, and achieving effective filtration and extraction of sand and gravel of different sizes is crucial for accurately analyzing sand and gravel gradation and assessing engineering properties.

[0004] In existing technologies, the separate filtration and extraction of sand and gravel of different sizes in soil and rock samples mainly utilizes sieves with different aperture sizes. Through mechanical vibration or manual shaking, particles smaller than the sieve apertures pass through, while larger particles are retained, thus achieving a grading sieve method. Although sieve methods have low equipment costs, are easy to operate, and can directly classify sand and gravel according to sieve aperture size, providing relatively intuitive results, they require different sieves for different particle sizes. While this isn't a significant drawback for large-scale sieve operations, in field applications during soil and rock exploration sampling, frequent sieve changes are often necessary, leading to inconvenience, low efficiency, and difficulties in carrying and managing the sieves. Therefore, centrifugal separation methods utilize the centrifugal force generated by high-speed rotation, causing components of different densities in the mixture to stratify or separate due to differences in force. By adjusting the centrifugal speed, particles of different sizes can be separated, thus avoiding the need for different sieves in sieve methods. However, due to the high price and maintenance cost of centrifugal separation equipment, it is not suitable for use in the field of soil and rock exploration sampling. Moreover, if the soil and rock samples contain organic matter or light impurities (such as plant residues), they may be mixed with the centrifugal force, thus affecting the separation effect.

[0005] In conclusion, since the existing technology obviously has inconveniences and defects in practical use, it is necessary to improve it. Utility Model Content

[0006] In order to solve the problems existing in the background technology, the present invention provides a sand extractor for rock and soil exploration that is simple in structure, easy to use, and has high separation efficiency.

[0007] The sand sampler for geotechnical exploration of this utility model is implemented as follows: it includes a fixed cylinder, a hopper, a sampling cylinder, a separating cylinder, a lifting cylinder, and a lifting adjustment component. The fixed cylinder is a vertical hollow cylinder with open ends. The hopper is fixedly installed at the top of the fixed cylinder. The sampling cylinder is a hollow cylinder with an open top and its top end is detachably fixedly connected to the bottom end of the fixed cylinder. The separating cylinder is a hollow cylinder with an open top and several sets of filter holes spaced axially on its side wall. The diameter of each set of filter holes on the side wall of the separating cylinder is different. The separating cylinder is suspended inside the fixed cylinder and its top end is fixedly connected to the upper part of the inner wall of the fixed cylinder. The lifting cylinder is a hollow cylinder with an open top and is movably installed inside the separating cylinder. A discharge window is provided on the lower side wall of the lifting cylinder. The lifting adjustment component is installed inside the hopper and its top end extends upward out of the hopper. The lifting adjustment component is connected to the lifting cylinder to drive the lifting cylinder to move up and down and rotate.

[0008] Furthermore, the lifting adjustment assembly includes a rotating shaft, a connecting seat I, and an elastic telescopic unit. The rotating shaft extends from top to bottom into the lifting cylinder and is rotatably connected to the rotating connecting seat at the bottom of the lifting cylinder. The connecting seat I is fixedly installed in the loading hopper above the lifting cylinder and has a through hole through which the soil sample can pass. The rotating shaft rotates through the connecting seat I. Multiple slots are spaced apart along the axial direction on the rotating shaft. The elastic telescopic unit is installed in the connecting seat I, and one end of the elastic telescopic unit can elastically abut against the slot on the rotating shaft in the connecting seat I.

[0009] Furthermore, the connecting seat I has multiple sets of circumferentially distributed telescopic holes on the inner wall of the through hole through which the rotating shaft rotates. The connecting seat I also has a spring hole at the bottom end of the telescopic hole. The elastic telescopic unit includes a clamping ball and a pushing spring. The clamping ball is movably disposed in the telescopic hole, and the pushing spring is movably disposed in the spring hole with its two ends respectively abutting against the bottom end of the clamping ball and the bottom end of the spring hole.

[0010] Furthermore, the diameter of the filter holes spaced axially on the side wall of the separation cylinder decreases sequentially from top to bottom. The diameter of each group of filter holes on the side wall of the separation cylinder is the same and they are evenly distributed circumferentially. At least two rectangular discharge windows are evenly distributed circumferentially on the lower side wall of the lifting cylinder. The height of the discharge windows is the same as the height of each group of filter holes on the side wall of the separation cylinder. The spacing between adjacent slots on the rotating shaft is the same as the spacing between two adjacent groups of filter holes on the side wall of the separation cylinder.

[0011] Furthermore, a connecting seat II is fixedly provided at the inner top of the lifting cylinder. The connecting seat II is provided with a through hole through which the soil sample can pass, and the rotating shaft rotates through the connecting seat II.

[0012] Furthermore, the connecting seat I and / or connecting seat II include a base that can rotatably pass through the central pivot, and multiple connecting rods spaced circumferentially, with their ends respectively fixedly connected to the corresponding base, the hopper, and the inner wall of the lifting cylinder. The elastic telescopic unit is disposed inside the base of the connecting seat I.

[0013] Furthermore, a threaded mounting seat I is fixedly provided at the bottom of the fixed cylinder, and a threaded mounting head I is fixedly provided at the top of the sampling cylinder, with the threaded mounting head I being threadedly connected to the threaded mounting seat I; a threaded mounting seat II is fixedly provided on the inner wall of the top of the fixed cylinder, and a threaded mounting head II is fixedly provided at the top of the separation cylinder, with the separation cylinder suspended inside the fixed cylinder through a threaded connection between the threaded mounting head II and the threaded mounting seat II.

[0014] Furthermore, the threaded mounting seat II has an annular structure and its outer circular surface is fixedly connected to the top inner wall of the fixed cylinder. The inner hole of the threaded mounting seat II is a stepped hole with a smaller upper diameter and a larger lower diameter. The threaded section on the threaded mounting seat II that is threadedly connected to the threaded mounting head II is located in the lower large hole. The diameter of the upper small hole of the threaded mounting seat II is smaller than the outer diameter of the lifting cylinder.

[0015] Furthermore, a stirring assembly is provided on the rotating shaft, the stirring assembly includes a stirring paddle, the stirring paddle is fixedly sleeved on the rotating shaft at the lower part of the lifting cylinder, and a crank handle or drive motor is fixedly provided at the top of the loading hopper extending upward from the rotating shaft.

[0016] Furthermore, an upwardly extending protective tube is fixedly installed above the connecting seat I, and the rotating shaft rotates through the protective tube, with the top end of the protective tube not lower than the bottom end of the hopper.

[0017] This utility model has the following beneficial effects: 1. This utility model features several sets of filter holes spaced axially along the side wall of the separation cylinder, with the diameter of the filter holes decreasing from top to bottom, and each set of filter holes being evenly distributed circumferentially. Simultaneously, at least two rectangular discharge windows are evenly distributed circumferentially on the lower side wall of the lifting cylinder, with the height of the discharge windows being the same as the height of each set of filter holes on the side wall of the separation cylinder. This allows the lifting cylinder to be raised, lowered, and rotated via a lifting adjustment component, aligning the discharge windows with filter holes of a specific diameter on the separation cylinder. This enables the separation of sand and gravel of corresponding particle sizes through the filter holes and discharge windows, allowing for the simultaneous grading and separation of sand and gravel of various specifications, significantly improving separation efficiency. Therefore, it eliminates the need to bring large quantities of soil and rock samples back to the laboratory for processing.

[0018] 2. The fixed cylinder, separation cylinder and sampling cylinder of this utility model are quickly assembled / disassembled through threaded connection seats, which is convenient for carrying and maintenance. Moreover, through the lightweight integrated design that integrates separation, lifting and stirring functions into a single device, it avoids the need to carry an additional centrifuge or multiple sets of screens, reducing the burden of on-site operations. Therefore, it is particularly suitable for use in geotechnical exploration sampling sites.

[0019] 3. This invention incorporates a stirring assembly on a rotating shaft. The shaft's rotation drives a stirring paddle to agitate the soil and rock sample, breaking up agglomerated particles and resulting in a more uniform sample distribution. This facilitates the smooth passage of sand and gravel of different sizes through the corresponding filter pores, further improving separation efficiency. Simultaneously, a crank handle or motor is fixedly mounted at the top of the hopper extending upwards from the rotating shaft. This allows operators to manually control the stirring and separation speed by cranking the handle; while a motor drive enables automated operation, reducing operator workload and ensuring the stability and efficiency of the separation process.

[0020] 4. This utility model, through the elastic telescopic unit in the lifting adjustment assembly, such as a structure composed of a clamping ball and a push spring, enables the rotating shaft to achieve intermittent positioning during rotation. Specifically, when the clamping ball of the elastic telescopic unit engages with the slot, the lifting cylinder stops moving up and down, ensuring precise alignment between the discharge window of the lifting cylinder and the filter holes on the separation cylinder. This avoids misalignment leading to poor separation results, thereby improving the accuracy and efficiency of separation. Furthermore, the spacing between adjacent slots on the rotating shaft is the same as the spacing between two adjacent sets of filter holes on the side wall of the separation cylinder, further guaranteeing the accuracy and efficiency of the entire separation process.

[0021] In summary, this utility model compresses the laboratory-grade sand and gravel grading process to the field terminal equipment. Through the triple collaborative design of axial variable diameter filter cylinder + adjustable window lifting cylinder + anti-clogging stirring, it solves the three major bottlenecks in geotechnical exploration: heavy sample transportation burden, low on-site grading efficiency, and poor equipment adaptability. It provides real-time and accurate sand and gravel gradation data support for field engineering geological evaluation and is suitable for engineering scenarios with many exploration points, large sample volume, and rapid feedback. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the sand sampler for rock and soil exploration according to this utility model; Figure 2 for Figure 1 Partial sectional view; Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 for Figure 2 Enlarged view at point B in the middle; In the diagram: 1-Fixed cylinder, 11-Threaded mounting seat I, 12-Threaded mounting seat II, 2-Feeding hopper, 3-Sampling cylinder, 31-Threaded mounting head I, 4-Separation cylinder, 41-Filter hole, 42-Threaded mounting head II, 5-Lifting cylinder, 51-Discharge window, 52-Rotating connecting seat, 53-Connecting seat II, 6-Lifting adjustment assembly, 61-Rotating shaft, 62-Connecting seat I, 63-Elastic telescopic unit, 64-Slot, 65-Telescopic hole, 66-Spring hole, 67-Clamping ball, 68-Push spring, 71-Agitator, 72-Handle, 8-Protective tube. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this does not limit the present invention in any way. Any changes or improvements made based on the teachings of the present invention shall fall within the protection scope of the present invention.

[0024] like Figure 1 , 2 As shown in Figures 3 and 4, the sand sampler for geotechnical exploration of this utility model includes a fixed cylinder 1, a loading hopper 2, a sampling cylinder 3, a separating cylinder 4, a lifting cylinder 5, and a lifting adjustment assembly 6. The fixed cylinder 1 is a vertical hollow cylinder open at both ends. The loading hopper 2 is fixedly installed at the top of the fixed cylinder 1. The sampling cylinder 3 is a hollow cylinder open at the top, and its top end is detachably fixedly connected to the bottom end of the fixed cylinder 1. The separating cylinder 4 is a hollow cylinder open at the top, and its side wall is provided with several sets of filter holes 41 spaced axially. The filter holes 41 on the side wall of the separating cylinder 4 have different diameters. The separating cylinder 4 is suspended inside the fixed cylinder 1 and its top is fixedly connected to the upper part of the inner wall of the fixed cylinder 1. The lifting cylinder 5 is a hollow cylinder with an open top and is movably installed inside the separating cylinder 4. The lower side wall of the lifting cylinder 5 is provided with a discharge window 51. The lifting adjustment component 6 is installed inside the hopper 2 and its top extends upward out of the hopper 2. The lifting adjustment component 6 is connected to the lifting cylinder 5 to drive the lifting cylinder 5 to move up and down and rotate.

[0025] The lifting and adjusting assembly 6 includes a rotating shaft 61, a connecting seat I 62, and an elastic telescopic unit 63. The rotating shaft 61 extends from top to bottom into the lifting cylinder 5 and is rotatably connected to the rotating connecting seat 52 at the bottom of the lifting cylinder 5. The connecting seat I 62 is fixedly installed in the loading hopper 2 above the lifting cylinder 5 and is provided with a through hole through which a soil sample can pass. The rotating shaft 61 rotates through the connecting seat I 62. Multiple slots 64 are provided axially at intervals on the rotating shaft 61. The elastic telescopic unit 63 is installed in the connecting seat I 62, and one end of the elastic telescopic unit 63 can elastically abut against the slot 64 on the rotating shaft 61 in the connecting seat I 62.

[0026] The connecting seat I 62 has multiple sets of circumferentially distributed telescopic holes 65 on the inner wall of the through hole through which the rotating shaft 61 rotates. The connecting seat I 62 also has a spring hole 66 at the bottom end of the telescopic hole 65. The elastic telescopic unit 63 includes a clamping ball 67 and a pushing spring 68. The clamping ball 67 is movably disposed in the telescopic hole 65, and the pushing spring 68 is movably disposed in the spring hole 66, with its two ends respectively abutting against the bottom ends of the clamping ball 67 and the spring hole 66.

[0027] The diameter of the filter holes 41 spaced axially on the side wall of the separation cylinder 4 decreases from top to bottom. The diameter of each group of filter holes 41 on the side wall of the separation cylinder 4 is the same and they are evenly distributed circumferentially. At least two rectangular discharge windows 51 are evenly distributed circumferentially on the lower side wall of the lifting cylinder 5. The height of the discharge windows 51 is the same as the height of each group of filter holes 41 on the side wall of the separation cylinder 4. The spacing between adjacent slots 64 on the rotating shaft 61 is the same as the spacing between two adjacent groups of filter holes 41 on the side wall of the separation cylinder 4.

[0028] A connecting seat II 53 is fixedly installed at the top inner side of the lifting cylinder 5. The connecting seat II 53 is provided with a through hole through which the soil sample can pass. The rotating shaft 61 rotates through the connecting seat II 53.

[0029] The connecting seat I 62 and / or connecting seat II 53 include a base that can rotatably pass through the rotating shaft 61 in the middle, and multiple connecting rods that are circumferentially spaced and whose ends are respectively fixedly connected to the corresponding base and the inner wall of the loading hopper 2 and the lifting cylinder 5. The elastic telescopic unit 63 is disposed in the base of the connecting seat I 62.

[0030] A threaded mounting seat I11 is fixedly installed at the bottom of the fixed cylinder 1, and a threaded mounting head I31 is fixedly installed at the top of the sampling cylinder 3. The threaded mounting head I31 is threadedly connected to the threaded mounting seat I11. A threaded mounting seat II12 is fixedly installed on the inner wall of the top of the fixed cylinder 1, and a threaded mounting head II42 is fixedly installed at the top of the separation cylinder 4. The separation cylinder 4 is suspended inside the fixed cylinder 1 through a threaded connection between the threaded mounting head II42 and the threaded mounting seat II12.

[0031] The threaded mounting seat II12 has an annular structure and its outer circular surface is fixedly connected to the top inner wall of the fixed cylinder 1. The inner hole of the threaded mounting seat II12 is a stepped hole with a smaller upper part and a larger lower part. The threaded section on the threaded mounting seat II12 that is threaded to the threaded mounting head II42 is set in the lower large hole. The diameter of the upper small hole of the threaded mounting seat II12 is smaller than the outer diameter of the lifting cylinder 5.

[0032] A stirring assembly is provided on the rotating shaft 61. The stirring assembly includes a stirring paddle 71, which is fixedly sleeved on the rotating shaft 61 at the lower part of the lifting cylinder 5. A crank handle 72 or a drive motor is fixedly provided on the top end of the rotating shaft 61 extending upward from the loading hopper 2.

[0033] A protective tube 8 extending upwards is fixedly installed above the connecting seat I 62. The rotating shaft 61 rotates through the protective tube 8, and the top end of the protective tube 8 is not lower than the bottom end of the loading hopper 2. The lifting and adjusting assembly 6 protects the rotating shaft 61 through the protective tube 8, thereby preventing soil particles from entering between the rotating shaft 61 and the connecting seat I 62 and affecting the normal operation of the equipment.

[0034] The working principle and process of the sand sampler for geotechnical investigation of this utility model: like Figure 1 , 2 As shown in Figures 3 and 4, when taking sand from soil and rock, the filter hole 41 of the corresponding diameter of the separation cylinder 4 is first selected according to the size of the sand particles. Then, the lifting cylinder 5 is lifted by the lifting adjustment component 6, and the discharge window 51 is moved to the selected corresponding filter hole 41. Then, the soil and rock sample can be added into the loading hopper 2. At this time, the soil and rock sample passes through the loading hopper 2 and enters the lifting cylinder 5. Then, the soil and rock sample in the lifting cylinder 5 can be stirred by the stirring component. The soil and rock sample is broken up by the stirring component and squeezed through the discharge window 51 to the filter hole 41 under the push of the stirring component. Small particles of sand and gravel with a particle size smaller than the diameter of the filter hole 41 are filtered out and then enter the sampling cylinder 3 through the gap between the separation cylinder 4 and the fixed cylinder 1. The small particles of sand and gravel and soil are collected through the sampling cylinder 3, thus completing the sand taking work of soil and rock sample. After the sand is extracted, the extracted sand and gravel can be injected back into the loading hopper 2, and the lifting cylinder 5 can be lifted and lowered again by the lifting adjustment component 6, so that the sand and gravel can be graded again according to their particle size.

[0035] When the lifting adjustment assembly 6 is working, the spring force of the push spring 68 first pushes the clamping ball 67 out of the telescopic hole 65, thereby causing the clamping ball 67 to be inserted into the slot 64 of the rotating shaft 61. Then, the clamping ball 67 clamps the slot 64, thereby clamping and fixing the rotating shaft 61 vertically. When it is necessary to control the lifting cylinder 5 to rise or fall, the rotating shaft 61 can be pressed down or pulled up. The rotating shaft 61 converts the downward pressure or upward pulling force into pushing the clamping ball 67. The force pushes the clamping ball 67 into the telescopic hole 65. After the clamping ball 67 is no longer in contact with the slot 64, the rotating shaft 61 can be controlled to slide downward or upward until the next slot 64 moves to the clamping ball 67. Then, the clamping ball 67 is pushed into the slot 64 again by the push spring 68, thereby clamping the rotating shaft 61 vertically again. While the rotating shaft 61 is rising and falling, the lifting cylinder 5 is driven to rise and fall by rotating the connecting seat 52.

[0036] During rotary filtration, the stirring assembly rotates the shaft 61 and its stirring paddle 71 by shaking the handle 72 at the top of the shaft 61 or by starting the drive motor at the top of the shaft 61. This stirs the soil and rock in the lower part of the lifting cylinder 5, allowing the small sand and soil particles in the soil and rock sample to come into full contact with the filter holes 41, thereby accelerating the filtration and sand removal effect of the equipment.

[0037] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A sand sampler for rock and soil exploration, characterized in that: The system includes a fixed cylinder (1), a hopper (2), a sampling cylinder (3), a separation cylinder (4), a lifting cylinder (5), and a lifting adjustment assembly (6). The fixed cylinder (1) is a vertical empty cylinder with open ends. The hopper (2) is fixedly installed at the top of the fixed cylinder (1). The sampling cylinder (3) is a hollow cylinder with an open top and its top end is detachably fixed to the bottom end of the fixed cylinder (1). The separation cylinder (4) is a hollow cylinder with an open top and several sets of filter holes (41) spaced axially on its side wall. Each set of filter holes (41) on the side wall of the separation cylinder (4) The filter holes (41) have different apertures. The separation cylinder (4) is suspended inside the fixed cylinder (1) and its top end is fixedly connected to the upper part of the inner wall of the fixed cylinder (1). The lifting cylinder (5) is a hollow cylinder with an open top and is movably installed inside the separation cylinder (4). The lower side wall of the lifting cylinder (5) is provided with a discharge window (51). The lifting adjustment component (6) is installed inside the hopper (2) and its top end extends upward out of the hopper (2). The lifting adjustment component (6) is connected to the lifting cylinder (5) to drive the lifting cylinder (5) to move up and down and rotate.

2. The sand sampler for geotechnical investigation according to claim 1, characterized in that: The lifting adjustment assembly (6) includes a rotating shaft (61), a connecting seat I (62), and an elastic telescopic unit (63). The rotating shaft (61) extends from top to bottom into the lifting cylinder (5) and is rotatably connected to the rotating connecting seat (52) at the bottom of the lifting cylinder (5). The connecting seat I (62) is fixedly installed in the loading hopper (2) above the lifting cylinder (5) and is provided with a through hole through which the soil sample can pass. The rotating shaft (61) rotates through the connecting seat I (62). Multiple slots (64) are provided axially along the rotating shaft (61). The elastic telescopic unit (63) is installed in the connecting seat I (62). One end of the elastic telescopic unit (63) can elastically abut against the slot (64) on the rotating shaft (61) in the connecting seat I (62).

3. The sand sampler for geotechnical investigation according to claim 2, characterized in that: The connecting seat I (62) has multiple sets of circumferentially distributed telescopic holes (65) on the inner wall of the through hole through which the rotating shaft (61) rotates. The connecting seat I (62) also has a spring hole (66) at the bottom end of the telescopic hole (65). The elastic telescopic unit (63) includes a clamping ball (67) and a push spring (68). The clamping ball (67) is movably disposed in the telescopic hole (65), and the push spring (68) is movably disposed in the spring hole (66) with its two ends abutting against the bottom end of the clamping ball (67) and the spring hole (66) respectively.

4. The sand sampler for geotechnical investigation according to claim 2 or 3, characterized in that: The diameter of the filter holes (41) spaced axially on the side wall of the separation cylinder (4) decreases from top to bottom. The diameter of each group of filter holes (41) on the side wall of the separation cylinder (4) is the same and they are evenly distributed circumferentially. At least two rectangular discharge windows (51) are evenly distributed circumferentially on the lower side wall of the lifting cylinder (5). The height of the discharge windows (51) is the same as the height of each group of filter holes (41) on the side wall of the separation cylinder (4). The spacing between adjacent slots (64) on the rotating shaft (61) is the same as the spacing between two adjacent groups of filter holes (41) on the side wall of the separation cylinder (4).

5. The sand sampler for geotechnical investigation according to claim 4, characterized in that: The inner top of the lifting cylinder (5) is fixedly provided with a connecting seat II (53), and the connecting seat II (53) is provided with a through hole through which the soil sample can pass. The rotating shaft (61) rotates through the connecting seat II (53).

6. The sand sampler for geotechnical investigation according to claim 5, characterized in that: The connecting seat I (62) and / or connecting seat II (53) include a base that can rotatably pass through the pivot (61) in the middle, and multiple connecting rods that are circumferentially spaced and whose ends are respectively fixedly connected to the corresponding base and the inner wall of the loading hopper (2) and the lifting cylinder (5). The elastic telescopic unit (63) is set in the base of the connecting seat I (62).

7. The sand sampler for geotechnical investigation according to claim 4, characterized in that: The bottom of the fixed cylinder (1) is fixedly provided with a threaded mounting seat I (11), and the top of the sampling cylinder (3) is fixedly provided with a threaded mounting head I (31). The threaded mounting head I (31) is threadedly connected to the threaded mounting seat I (11). The top inner wall of the fixed cylinder (1) is fixedly provided with a threaded mounting seat II (12), and the top of the separation cylinder (4) is fixedly provided with a threaded mounting head II (42). The separation cylinder (4) is suspended inside the fixed cylinder (1) through the threaded mounting head II (42) and the threaded mounting seat II (12).

8. The sand sampler for geotechnical investigation according to claim 7, characterized in that: The threaded mounting seat II (12) is an annular structure and its outer circular surface is fixedly connected to the top inner wall of the fixed cylinder (1). The inner hole of the threaded mounting seat II (12) is a stepped hole with a smaller upper part and a larger lower part. The threaded section on the threaded mounting seat II (12) that is threaded to the threaded mounting head II (42) is set in the lower large hole. The diameter of the upper small hole of the threaded mounting seat II (12) is smaller than the outer diameter of the lifting cylinder (5).

9. The sand sampler for geotechnical investigation according to claim 4, characterized in that: A stirring assembly is provided on the rotating shaft (61). The stirring assembly includes a stirring paddle (71). The stirring paddle (71) is fixedly sleeved on the rotating shaft (61) at the lower part of the lifting cylinder (5). A crank handle (72) or a drive motor is fixedly provided on the top of the rotating shaft (61) extending upward out of the loading hopper (2).

10. The sand sampler for geotechnical investigation according to claim 9, characterized in that: A protective tube (8) extending upward is fixedly installed above the connecting seat I (62), and the rotating shaft (61) rotates through the protective tube (8). The top end of the protective tube (8) is not lower than the bottom end of the hopper (2).

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