A soil sample preparation device for preparing large volumes of sand

Abstract

The utility model provides a kind of preparation bulk soil's soil sample preparation device, including base and the support frame of installation in the base top end;Detachable barrel, located the base top end is used to contain sand to be pressed;Compaction unit, including the mounting plate of sliding on the support frame, setting in the mounting plate top end is used to drive the jack of the mounting plate lower migration and setting in the mounting plate bottom end and is used to press the soil steel plate of sand inside detachable barrel;Knocking component, for the soil steel plate press sand when to the detachable barrel is knocked.Between the utility model by being set knocking component, it is convenient to constantly to sample iron barrel periphery multiple point position is carried out same frequency and reciprocating knock, solved the problem that there is the big problem of change of knocking frequency and knocking force in the process of repeated knocking in need multiple staff, effectively reduce labor input.

Description

Technical Field

[0001] This utility model relates to the field of sand and soil sample preparation technology, specifically to a geotechnical sample preparation device for preparing large-volume sand and soil. Background Technology

[0002] In engineering construction in aeolian sandy soil areas, the study of sand properties is crucial, providing significant guidance for project design selection and cost estimation. Since obtaining undisturbed sand samples in the field is difficult, replicating these samples in the laboratory for testing would greatly reduce workload and time. Extensive literature review reveals a direct correlation between sand properties and density. Therefore, by collecting small, undisturbed soil samples from the site and testing their maximum, minimum dry density, and natural density in the laboratory, the density can be quantitatively determined using the Dr index. Thus, by preparing sand samples of varying densities at different depths at the project site in the laboratory, the physical, mechanical, and permeability parameters of the sand can be measured in a geotechnical laboratory, simulating the sandy soil strata.

[0003] When preparing geotechnical samples, the sand collected from the construction site is weighed and placed into a sample container. A jack is used to press the sand with a pressure plate. At the same time, multiple workers need to continuously tap the container to generate vibration and assist the jack in compressing the sand. This process requires a large amount of labor, and the frequency and force of the tapping vary greatly, which further affects the compaction of the sand. In addition, the sand sample is inconvenient to take after the sample is prepared because the iron container cannot be disassembled. Utility Model Content

[0004] The purpose of this invention is to overcome the above-mentioned shortcomings and provide a geotechnical sample preparation device for preparing large volumes of sand that avoids manual hammering.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a geotechnical sample preparation device for preparing large-volume sand, comprising: A base and a support frame mounted on top of the base; A detachable bucket, located at the top of the base, is used to hold the sand to be pressed. The compaction unit includes a mounting plate that slides on the support frame, a jack located at the top of the mounting plate for driving the mounting plate to move downward, and a soil-pressing steel plate located at the bottom of the mounting plate for pressing the sand inside the removable bucket. The striking component is used to strike the detachable bucket when the soil-pressing steel plate presses down on the sand.

[0006] Furthermore, the detachable bucket includes a base plate disposed at the top of the base, a sample preparation iron bucket disposed at the top of the base plate, and a protective sleeve disposed at the top of the sample preparation iron bucket to increase the amount of sand and soil it can hold. The bottom end of the sample preparation iron bucket is provided with equally spaced docking grooves, and the top end of the base plate is provided with docking rods that pass through the docking grooves.

[0007] Furthermore, the striking assembly includes a retractable pushing mechanism disposed at the bottom end of the mounting plate and a striking mechanism connected to the retractable pushing mechanism for striking the sample preparation iron barrel. The striking mechanism includes a mounting base disposed on the outer wall of the sample preparation iron barrel, striking units equally spaced on the mounting base, and a connecting piece for locking the striking units.

[0008] Furthermore, the striking unit includes an L-shaped rod mounted on the mounting base, two slots longitudinally formed on the L-shaped rod, a base mounted on the side wall of the L-shaped rod and located on one side of the slots, a mounting shaft fixed to the base, a striking hammer rotatably mounted on the mounting shaft for striking the sample iron barrel, a pusher tooth rotatably mounted on the mounting shaft for pushing the striking hammer to swing, an arc-shaped rod mounted at the bottom end of the slots and penetrating the striking hammer, a spring sleeved on the arc-shaped rod connecting the slots and the side wall of the striking hammer for pushing the striking hammer to reset, and an abutment rod mounted on one side of the striking hammer for abutting against the side wall of the pusher tooth.

[0009] Furthermore, the connector includes mounting holes equally spaced on the mounting base, and each L-shaped rod is threaded with a mounting rod connected to the mounting hole.

[0010] Furthermore, the retractable pushing mechanism includes a mounting cylinder fixed to the bottom end of the mounting plate, a sliding opening formed on the inner wall of the mounting cylinder, a mounting ring sliding on the inner wall of the mounting cylinder, threaded holes formed on the mounting cylinder and the mounting ring, a threaded rod for locking the mounting ring and the mounting cylinder and connected to the threaded hole, a slider disposed on the outer wall of the mounting ring and sliding inside the sliding opening, and pushing units equally spaced on the bottom end of the mounting ring.

[0011] Furthermore, the pushing unit includes a fixing plate installed at the bottom end of the mounting ring, and the fixing plate has push blocks spaced longitudinally at intervals on the side near the soil-pressing steel plate for pushing the pusher teeth to swing.

[0012] Furthermore, the bottom end of the fixing plate is provided with a lifting unit for driving the sample preparation iron barrel to move upward with the mounting plate. The lifting unit includes a fixing seat installed at the bottom end of the fixing plate. Insert rods are slidably inserted inside the fixing seat. The bottom end of the side wall of the sample preparation iron barrel is provided with a socket adapted to the insert rod. Two sets of locking holes are provided on the insert rod. Locking rods inserted into the locking holes are threadedly connected to the fixing seat.

[0013] Furthermore, the inner wall of the support frame is symmetrically provided with support brackets for stopping the mounting plate and controlling the downward movement of the soil-pressing steel plate.

[0014] Furthermore, the top of the mounting plate is provided with a pull rope for stabilizing the mounting plate, and the top of the support frame is detachably equipped with a pad rod that contacts the top column of the jack and is used to increase the downward pressing distance of the soil-pressing steel plate.

[0015] Compared with the prior art, this utility model has the following beneficial effects: By setting up a striking component, this utility model facilitates continuous and repetitive striking at multiple points on the outer periphery of the sample preparation iron barrel at the same frequency, solving the problem of large variations in striking frequency and striking force during repeated striking by multiple workers, and effectively reducing labor input; through the design of the lifting unit, it is convenient to lift the sample preparation iron barrel simultaneously when the sand is pressed and moved up on the mounting plate, effectively realizing the disassembly of the sample preparation iron barrel from the base plate, thereby completing the sampling operation of the sand block. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a perspective view of an embodiment of the present invention.

[0017] Figure 2 This is an embodiment of the present utility model. Figure 1 A partial schematic diagram.

[0018] Figure 3 This is a schematic diagram of the structure of a striking unit according to an embodiment of the present invention.

[0019] Figure 4 This is a schematic diagram of a retractable pushing mechanism according to an embodiment of the present invention.

[0020] Figure 5 for Figure 4 A sectional view.

[0021] Figure 6 for Figure 2A magnified structural diagram of point A in the middle.

[0022] Figure 7 This is a schematic diagram of a detachable bucket according to an embodiment of the present invention.

[0023] Figure 8 This is a connection diagram of the detachable bucket and the extension tube according to an embodiment of the present invention.

[0024] In the diagram: 1. Base; 2. Support frame; 3. Base plate; 4. Sample container; 5. Protective casing; 6. Mounting plate; 7. Jack; 8. Pad rod; 9. Pull rope; 10. Support bracket; 11. Abutment rod; 12. Soil-pressing steel plate; 13. L-shaped rod; 14. Groove; 15. Base; 16. Mounting shaft; 17. Hammer; 18. Push tooth; 19. Arc rod; 20. Spring; 21. Mounting cylinder; 22. Mounting ring; 23. Fixing plate; 24. Push block; 25. Threaded hole; 26. Threaded rod; 27. Sliding mouth; 28. Sliding block; 29. ​​Fixing seat; 30. Insert rod; 31. Locking mouth; 32. Locking rod; 33. Insertion mouth; 34. Connecting rod; 35. Connecting groove; 36. Mounting hole; 37. Mounting rod; 38. Mounting seat. Detailed Implementation

[0025] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0027] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, "multiple" refers to two or more. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] like Figure 1-8 As shown, this utility model discloses a geotechnical sample preparation device for preparing large-volume sand, comprising: A base 1 and a support frame 2 mounted on the top of the base 1; A detachable bucket, located at the top of the base 1, is used to hold the sand to be pressed. The compaction unit includes a mounting plate 6 that slides on the support frame 2, a jack 7 located at the top of the mounting plate 6 for driving the mounting plate 6 to move downward, and a soil-pressing steel plate 12 located at the bottom of the mounting plate 6 for pressing the sand inside the removable bucket. The striking component is used to strike the detachable bucket when the soil-pressing steel plate 12 presses down on the sand.

[0029] In use, a certain amount of aeolian sand is taken from the engineering site. The volume of sand taken must be sufficient to prepare a large-volume sand model with different densities. Before preparing the large-volume sand samples with different densities, the natural dry density, maximum and minimum dry density of small-volume undisturbed sand samples with different densities taken from the engineering site are tested indoors. Since the volume of the sample preparation iron bucket 4 is fixed and known, the required sand mass can be calculated based on the known dry density of the site and the volume of the sample preparation iron bucket 4. Then, the required sand mass is weighed and calculated, and the weighed sand is prepared for use. Next, the top column extending from the upper part of the jack 7 is pressed back to its initial state, and the sand is taken... The pad rod 8, installed on the support frame 2, controls the winding unit connected to the pull rope 9. A crank handle drives the rotating rod to rotate, causing the winding wheel to wind the pull rope 9, lifting the soil-pressing steel plate 12 upwards above the detachable bucket. A fixing valve is then rotated to secure the rotating rod, keeping the soil-pressing steel plate 12 suspended in the air. Next, the weighed sand is poured from the top of the protective casing 5 into the sample preparation bucket 4. If the weighed sand amount does not exceed the top of the protective casing 5, all the weighed sand can be poured in at once. If the weighed sand amount is higher than the top of the protective casing 5, an extension tube needs to be inserted into the top of the protective casing 5. This increases the storage capacity of the detachable bucket, facilitating one-time filling. For compaction, hold the crank handle with one hand and open the fixed valve with the other. Connect the external jack pressurization device to jack 7. This will cause the jack 7's top column to extend outward and contact the top of the support frame 2, pushing the soil-pressurizing steel plate 12 downward and pressing it into the sand inside the casing 5, thus compressing the sand. When the jack 7's top column extends too far outward, stop pressurizing jack 7 and unload it. Then install the pad rod 8 on the support frame 2 and pressurize jack 7 again. This will cause the jack 7's top column to extend outward and contact the pad rod 8, thus extending the downward distance of the soil-pressurizing steel plate 12. Stop pressurizing when the mounting plate 6 is in full contact with the support bracket 10. At this point, the bottom surface of the soil-pressurizing steel plate 12 just reaches the control point. At the top of the sample iron barrel 4, the density of the sand inside the sample iron barrel 4 is the required density of the sand block. During the pressing of the sand block by the pressing steel plate 12, the design of the striking component allows for continuous and repeated striking of the outer periphery of the sample iron barrel 4 at multiple points with the same frequency. This effectively avoids the need for multiple workers to repeatedly strike the sand block and solves the problem of large variations in frequency and force when multiple people strike the sand block, thus effectively reducing labor input. The design of the lifting unit facilitates the lifting of the sample iron barrel 4 by moving upwards along with the mounting plate 6 after the sand block is pressed. This effectively allows for the disassembly of the sample iron barrel 4 from the base plate 3, thereby completing the sand block sampling operation.

[0030] It should be noted that the detachable bucket includes a base plate 3 at the top of the base 1, a sample preparation iron bucket 4 at the top of the base plate 3, and a protective sleeve 5 at the top of the sample preparation iron bucket 4 to increase the sand storage capacity. The bottom of the sample preparation iron bucket 4 has equally spaced docking grooves 35, and the top of the base plate 3 has docking rods 34 inserted into the docking grooves 35. This design, through the detachable bucket design, facilitates the disassembly of the base plate 3 and the sample preparation iron bucket 4, avoiding the difficulty in removing the sand blocks inside when the base plate 3 and the sample preparation iron bucket 4 are a single unit, effectively facilitating the removal of sand blocks. Simultaneously, the docking of the docking rods 34 and the docking grooves 35 enables precise connection of the lifting unit to the sample preparation iron bucket 4. The connection between the sample preparation iron bucket 4 and the protective sleeve 5 adopts a stepped joint, ensuring full contact and preventing wobbling.

[0031] Preferably, the top of the protective casing 5 is symmetrically provided with protrusions, and an extension tube is detachably installed on the top of the protective casing 5. The bottom end of the extension tube is provided with a groove that matches the protrusions. With this design, if the amount of sand to be weighed exceeds the top of the protective casing 5, the extension tube can be inserted into the protective casing 5 to increase the amount of sand that can be collected. This facilitates compaction work in one go and avoids the need to pour in a portion of sand and compact it first, and then pour in the remaining sand. The required amount of sand can be poured into the sample preparation iron bucket 4 and compacted without the need for batch compaction.

[0032] It should be noted that the striking assembly includes a retractable pushing mechanism disposed at the bottom of the mounting plate 6 and a striking mechanism connected to the retractable pushing mechanism for striking the sample preparation iron barrel 4. The striking mechanism includes a mounting base 38 disposed on the outer wall of the sample preparation iron barrel 4, striking units equally spaced on the mounting base 38, and a connector for locking the striking units. This design allows for multi-point intermittent striking of the outer periphery of the sample preparation iron barrel 4 during the downward movement of the mounting plate 6. The striking causes vibration of the sand inside the sample preparation iron barrel 4 and effectively assists the soil-pressing steel plate 12 in compressing and compacting the sand. This process avoids repeated striking by multiple workers, effectively reducing labor input. Furthermore, it avoids large variations in striking frequency and force when multiple workers are striking.

[0033] It should be noted that the striking unit includes an L-shaped rod 13 mounted on the mounting base 38, two slots 14 longitudinally opened on the L-shaped rod 13, a base 15 mounted on the side wall of the L-shaped rod 13 and located on one side of the slots 14, a mounting shaft 16 fixed to the base 15, a striking hammer 17 rotatably mounted on the mounting shaft 16 for striking the sample iron barrel 4, a pusher tooth 18 rotatably mounted on the mounting shaft 16 for pushing the striking hammer 17 to swing, an arc-shaped rod 19 mounted at the bottom end of the slots 14 and passing through the striking hammer 17, a spring 20 sleeved on the arc-shaped rod 19 connecting the slots 14 and the side wall of the striking hammer 17 for pushing the striking hammer 17 to reset, and an abutment rod 11 mounted on one side of the striking hammer 17 for abutting against the side wall of the pusher tooth 18. This design, through the design of the striking unit, facilitates the downward movement of the retractable pushing mechanism, which pushes the push tooth 18 downward around the mounting shaft 16. Then, due to the stopping action of the abutment rod 11, the push tooth 18 pushes the abutment rod 11, causing the striking hammer 17 to swing around the mounting shaft 16. The striking hammer 17 then slides on the arc-shaped rod 19, generating elastic force in the spring 20. Subsequently, when the retractable pushing mechanism continues to move downward and disconnects the pressure on the push tooth 18, the elastic force of the spring 20 causes the striking hammer 17 to deflect in the opposite direction, achieving its reset. During this process, the outer wall of the sample preparation container 4 is struck, enabling multiple striking hammers 17 to simultaneously strike the outer wall of the sample preparation container 4 at multiple points, effectively replacing manual striking and reducing labor input.

[0034] It should be noted that the connector includes mounting holes 36 evenly spaced on the mounting base 38, and each L-shaped rod 13 is threaded with a mounting rod 37 connected to the mounting holes 36. This design allows for the installation and positioning of the L-shaped rod 13 through the connection between the mounting holes 36 and the mounting rods 37.

[0035] It should be noted that the retractable pushing mechanism includes a mounting cylinder 21 fixed to the bottom end of the mounting plate 6, a sliding opening 27 formed on the inner wall of the mounting cylinder 21, a mounting ring 22 sliding on the inner wall of the mounting cylinder 21, a threaded hole 25 formed on the mounting cylinder 21 and the mounting ring 22, a threaded rod 26 for locking the mounting ring 22 and the mounting cylinder 21 and connected to the threaded hole 25, a slider 28 disposed on the outer wall of the mounting ring 22 and sliding inside the sliding opening 27, and pushing units equally spaced at the bottom end of the mounting ring 22. This design, through the telescopic pushing mechanism, facilitates the sliding of the mounting ring 22 inside the mounting cylinder 21. When placing the sand to be pressed into the sample iron bucket 4, the mounting ring 22 can be installed at the top of the mounting cylinder 21. During the pressing stage, the mounting ring 22 can be installed at the bottom of the mounting cylinder 21. Through the connection between the threaded rod 26 and the threaded hole 25, the mounting ring 22 and the mounting cylinder 21 can be locked, avoiding the problem of the pushing unit sliding during the hammering process, and effectively providing stability for the hammering work.

[0036] It should be noted that the pushing unit includes a fixing plate 23 installed at the bottom of the mounting ring 22. The fixing plate 23 has longitudinally spaced push blocks 24 for pushing the push teeth 18 to swing on the side near the soil-pressing steel plate 12. With this design, the pushing unit can intermittently press the push teeth 18 during the downward movement, thereby allowing the hammer 17 to intermittently strike the sample preparation iron bucket 4.

[0037] It should be noted that the bottom end of the fixing plate 23 is provided with a lifting unit for driving the sample preparation iron barrel 4 to move upward with the mounting plate 6. The lifting unit includes a fixing seat 29 installed at the bottom end of the fixing plate 23. Insert rods 30 are slidably inserted inside the fixing seat 29. The bottom side wall of the sample preparation iron barrel 4 is provided with a circumferentially opened insertion port 33 that matches the insertion rod 30. Two sets of locking ports 31 are opened on each insertion rod 30. Locking rods 32 are threadedly connected to the fixing seat 29 and inserted into the locking ports 31. With this design, after pressing the sand blocks, the worker slides the fixing seat 29 inside the fixing plate 23, so that one end of the fixing seat 29 is inserted into the insertion port 33 on the outer wall of the sample preparation iron barrel 4, thereby connecting the fixing seat 29 and the sample preparation iron barrel 4. Then, the fixing seat 29 and the fixing plate 23 are locked by the insertion rod 30, so that the sample preparation iron barrel 4 can be moved up synchronously when the mounting plate 6 moves the soil pressing steel plate 12 up, thereby disconnecting the sample preparation iron barrel 4 from the bottom plate 3, and realizing the discharge operation of the sand blocks inside the sample preparation iron barrel 4.

[0038] It should be noted that the inner wall of the support frame 2 is symmetrically provided with support brackets 10 for stopping the mounting plate 6 and controlling the downward movement of the soil-pressing steel plate 12. This design, through the design of the support brackets 10, facilitates stopping the mounting plate 6 when the soil-pressing steel plate 12 is pressed flush with the top surface of the sample container 4, effectively controlling the downward movement height of the soil-pressing steel plate 12.

[0039] It should be noted that the top of the mounting plate 6 is provided with a rope 9 for stabilizing and suspending the mounting plate 6, and the top of the support frame 2 is detachably equipped with a pad rod 8 that contacts the top column of the jack 7 and is used to increase the downward pressing distance of the soil-pressing steel plate 12. This design, through the design of the pad rod 8, facilitates increasing the downward movement distance of the soil-pressing steel plate 12.

[0040] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

Claims

1. A geotechnical sample preparation device for preparing large-volume sand, comprising a base (1) and a support frame (2) installed on the top of the base (1), characterized in that: include: A detachable bucket, located at the top of the base (1), is used to hold sand to be pressed; The compaction unit includes a mounting plate (6) that slides on the support frame (2), a jack (7) set at the top of the mounting plate (6) for driving the mounting plate (6) to move down, and a soil-pressing steel plate (12) set at the bottom of the mounting plate (6) for pressing the sand inside the removable bucket. A striking component is used to strike the detachable bucket when the soil-pressing steel plate (12) presses down on the sand.

2. The geotechnical sample preparation device for preparing large-volume sand as described in claim 1, characterized in that: The detachable bucket includes a base plate (3) set at the top of the base (1), a sample preparation iron bucket (4) set at the top of the base plate (3), and a protective sleeve (5) set at the top of the sample preparation iron bucket (4) to increase the amount of sand and soil to be collected. The bottom end of the sample preparation iron bucket (4) is provided with equally spaced docking grooves (35), and the top end of the base plate (3) is provided with docking rods (34) that pass through the docking grooves (35).

3. The geotechnical sample preparation device for preparing large-volume sand as described in claim 2, characterized in that: The striking assembly includes a retractable pushing mechanism disposed at the bottom of the mounting plate (6) and a striking mechanism connected to the retractable pushing mechanism for striking the sample preparation iron barrel (4). The striking mechanism includes a mounting base (38) disposed on the outer wall of the sample preparation iron barrel (4), striking units disposed at equal intervals on the mounting base (38), and a connector for locking the striking units.

4. The geotechnical sample preparation device for preparing large-volume sand as described in claim 3, characterized in that: The striking unit includes an L-shaped rod (13) mounted on the mounting base (38), two slots (14) longitudinally formed on the L-shaped rod (13), a base (15) mounted on the side wall of the L-shaped rod (13) and located on one side of the slots (14), a mounting shaft (16) fixed to the base (15), a striking hammer (17) rotatably mounted on the mounting shaft (16) for striking the sample iron bucket (4), and a hammer rotatably mounted on the mounting shaft. (16) includes a pusher tooth (18) for pushing the hammer (17) to swing, an arc-shaped rod (19) installed at the bottom of the slot (14) and passing through the hammer (17), a spring (20) sleeved on the arc-shaped rod (19) connecting the slot (14) and the side wall of the hammer (17) for pushing the hammer (17) to reset, and an abutment rod (11) installed on one side of the hammer (17) for abutting against the side wall of the pusher tooth (18).

5. The geotechnical sample preparation device for preparing large-volume sand as described in claim 4, characterized in that: The connector includes mounting holes (36) evenly spaced on the mounting base (38), and each L-shaped rod (13) is threaded with a mounting rod (37) connected to the mounting hole (36).

6. The geotechnical sample preparation device for preparing large-volume sand as described in claim 4, characterized in that: The retractable pushing mechanism includes a mounting cylinder (21) fixed to the bottom end of the mounting plate (6), a sliding opening (27) opened on the inner wall of the mounting cylinder (21), a mounting ring (22) sliding on the inner wall of the mounting cylinder (21), a threaded hole (25) opened on the mounting cylinder (21) and the mounting ring (22), a threaded rod (26) for locking the mounting ring (22) and the mounting cylinder (21) and connected to the threaded hole (25), a slider (28) disposed on the outer wall of the mounting ring (22) and sliding inside the sliding opening (27), and a pushing unit installed at equal intervals at the bottom end of the mounting ring (22).

7. The geotechnical sample preparation device for preparing large-volume sand as described in claim 6, characterized in that: The pushing unit includes a fixing plate (23) installed at the bottom of the mounting ring (22), and the fixing plate (23) has push blocks (24) arranged longitudinally at intervals on the side near the soil pressing steel plate (12) for pushing the push teeth (18) to swing.

8. The geotechnical sample preparation device for preparing large-volume sand as described in claim 7, characterized in that: The bottom end of the fixed plate (23) is provided with a lifting unit for driving the sample preparation iron barrel (4) to move upward with the mounting plate (6). The lifting unit includes a fixed seat (29) installed at the bottom end of the fixed plate (23). Insert rods (30) are slidably inserted inside the fixed seat (29). The bottom end of the side wall of the sample preparation iron barrel (4) is provided with a socket (33) that matches the insert rod (30). Two sets of locking holes (31) are provided on the insert rod (30). Locking rods (32) that are threaded into the locking holes (31) are connected to the fixed seat (29).

9. The geotechnical sample preparation device for preparing large-volume sand as described in claim 1, characterized in that: The inner wall of the support frame (2) is symmetrically provided with support brackets (10) for stopping the mounting plate (6) and controlling the downward position of the soil pressing steel plate (12).

10. The geotechnical sample preparation device for preparing large-volume sand as described in claim 1, characterized in that: The top of the mounting plate (6) is provided with a pull rope (9) for stabilizing the mounting plate (6), and the top of the support frame (2) is detachably equipped with a pad rod (8) that contacts the top column of the jack (7) and is used to increase the downward pressing distance of the soil pressing steel plate (12).

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