Undisturbed soil column sampler for silt dam

Abstract

The utility model belongs to the field of samplers, and particularly relates to a silt dam undisturbed soil column sampler which comprises a sampling barrel, a boss is connected to the inner side of an opening in the lower end of the sampling barrel through threads, a cutting edge is integrally formed at the bottom of the boss, and the edge of the upper end of the cutting edge abuts against the bottom of the sampling barrel. The boss is located on the inner side of the edge of the upper end of the cutting edge and used for installing the cutting edge, the outer diameter of the cutting edge is the same as that of the sampling barrel, the inner side of the sampling barrel is slidably connected with a lining pipe, and the lining pipe is a container for directly containing a soil sample. According to the utility model, the negative pressure component consisting of the pull rod, the piston and the spring is arranged in the hollow shell, so that the active protection on the soil sample is realized. During sampling, the pull rod is pulled upwards to enable the piston to generate stable negative pressure in the hollow shell, and the negative pressure acts on the top of the soil column through the bottom through hole to generate upward adsorption force, so that the falling of the soil column caused by dead weight and insufficient friction force with a pipe wall can be counteracted to a certain extent, and the sampling integrity of a sample is ensured.

Description

Technical Field

[0001] This utility model relates to the field of sampler technology, specifically a sampler for undisturbed soil columns of silt-retaining dams. Background Technology

[0002] Field testing equipment plays an irreplaceable role in the smooth and efficient conduct of field experiments. Silt-retaining dams on the Loess Plateau are of great importance to the production and lives of the local people; therefore, research on silt-retaining dams, especially field testing, is crucial.

[0003] A search revealed that a utility model patent with patent authorization announcement number CN212410123U discloses an original soil column sampler for silt-retaining dams, which includes a serrated sampling cylinder and an operating rod at the bottom. Inside the sampling cylinder, there is a bulldozer disc that fits tightly against the inner wall of the sampling cylinder. A hollow connecting column is connected to the upward-facing position of the bulldozer disc. The connecting column extends upward through the sampling cylinder and is threadedly connected to the operating rod. The connection between the connecting column and the sampling cylinder is fixed with a nut, which is used to prevent the bulldozer disc from moving when not in use.

[0004] Based on the search of the aforementioned patents and the findings of existing samplers, it was discovered that during the lifting process, soil samples, especially long cylindrical samples, are prone to falling off due to their own weight, vibration, and insufficient friction with the tube wall, leading to sampling failure. Utility Model Content

[0005] The purpose of this invention is to provide a sampler for undisturbed soil columns in silt-retaining dams, which solves the problem of sampling failure that is common with traditional samplers.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a undisturbed soil column sampler for silt-retaining dams, comprising a sampling cylinder, a boss connected to the inner side of the lower opening of the sampling cylinder by a thread, a cutting edge integrally formed at the bottom of the boss, the upper edge of the cutting edge abutting against the bottom of the sampling cylinder, the boss being located inside the upper edge of the cutting edge for mounting the cutting edge, the outer diameter of the cutting edge being the same as the outer diameter of the sampling cylinder, an inner liner tube slidably connected to the inner side of the sampling cylinder, the inner liner tube being a container directly containing soil samples, the bottom of the inner liner tube abutting against the top of the cutting edge, a hollow tube connected to the top of the sampling cylinder by a thread, the hollow tube penetrating the sampling cylinder, a hollow shell connected to the lower end of the hollow tube, the hollow shell slidably connected to the inner side of the sampling cylinder, the bottom of the hollow shell abutting against the top of the inner liner tube.

[0007] Preferably, the bottom of the hollow shell has several evenly distributed through holes. A piston is slidably connected to the inner side of the hollow shell, and a pull rod is fixedly connected to the upper end of the piston. The pull rod passes through the hollow tube, and a spring is sleeved on the lower section of the pull rod. One end of the spring is fixedly connected to the upper end of the piston, and the other end of the spring is fixedly connected to the top of the inner side of the hollow shell. A locking block is fixedly connected to the upper section of the pull rod, and the locking block engages with the hollow tube. By pulling the piston upward with the pull rod, the piston creates a negative pressure inside the hollow shell, which helps to support the soil sample inside the inner liner tube.

[0008] Preferably, a sealing ring is embedded in the outer wall of the piston, and the sealing ring is slidably connected to the inner wall of the sampling cylinder. By providing the sealing ring, the sealing performance between the piston and the hollow shell can be increased.

[0009] Preferably, the lower section of the pull rod has an annular groove, and multiple ball bearings are slidably connected to the inner side of the annular groove, with the ball bearings slidably connected to the inner wall of the hollow tube. The ball bearings reduce the relative friction between the pull rod and the hollow tube.

[0010] Preferably, the top end of the hollow tube has two large and two small slots, which are symmetrically arranged in pairs. The locking block engages with the interior of the large slot. The width of the large and small slots is the same as that of the locking block, and the depth of the large slot is greater than that of the small slot. After the locking block moves upward along the axial direction of the hollow tube with the pull rod, the pull rod is rotated to make the locking block engage with the small slot, thereby limiting the position of the piston.

[0011] Preferably, a pull ring is welded to the top of the pull rod, and the pull ring is made of stainless steel. The user can pull the pull rod upward by pulling the pull ring.

[0012] Preferably, the upper outer side of the sampling tube is provided with multiple graduated rings, and a threaded sleeve is threadedly connected to the middle outer side of the sampling tube. A pressure plate is fixedly connected to the bottom of the threaded sleeve and slidably connected to the outer side of the sampling tube. A pointer is fixedly connected to the top of the threaded sleeve, and the position of the pointer's tip corresponds to the position of the graduated rings. The pressure plate can be fixed in position after entering the soil inside the sampling tube, and the position of the pressure plate can be adjusted by the threaded sleeve, thereby controlling the sampling depth.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model achieves active protection of soil samples by setting a negative pressure assembly consisting of a pull rod, piston, and spring inside a hollow shell. During sampling, pulling up the pull rod causes the piston to generate a stable negative pressure inside the hollow shell. This negative pressure acts on the top of the soil column through the bottom through-hole, generating an upward adsorption force, which can, to a certain extent, counteract the soil column's detachment caused by its own weight and insufficient friction with the tube wall, ensuring the integrity of the sample collection.

[0015] 2. This utility model provides a depth control mechanism on the outside of the sampling cylinder. The depth control mechanism consists of a threaded sleeve, a pressure plate, a pointer, and a scale ring. This allows the operator to determine the sampling depth during sampling, avoiding errors caused by relying on experience in traditional methods. Attached Figure Description

[0016] Figure 1 This is a perspective view of the overall structure of this utility model;

[0017] Figure 2 This utility model Figure 1 A front sectional view;

[0018] Figure 3 This utility model Figure 1 Schematic diagram of local structure Figure 1 ;

[0019] Figure 4 This utility model Figure 1 Schematic diagram of local structure Figure 2 ;

[0020] Figure 5 This utility model Figure 1 Schematic diagram of local structure Figure 3 .

[0021] In the diagram: 1. Sampling cylinder; 2. Blade edge; 201. Boss; 3. Inner liner tube; 4. Hollow tube; 401. Large slot; 402. Small slot; 5. Hollow shell; 51. Through hole; 6. Pull rod; 7. Piston; 71. Sealing ring; 8. Spring; 9. Ball bearing; 10. Pull ring; 11. Locking block; 12. Threaded sleeve; 13. Pressure plate; 14. Pointer; 15. Scale ring. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-5A soil column sampler for silt-retaining dams includes a sampling cylinder 1. A boss 201 is threadedly connected to the inner side of the lower opening of the sampling cylinder 1. A cutting edge 2 is integrally formed at the bottom of the boss 201. The upper edge of the cutting edge 2 abuts against the bottom of the sampling cylinder 1. The boss 201 is located inside the upper edge of the cutting edge 2 and is used for the installation of the cutting edge 2. The outer diameter of the cutting edge 2 is the same as the outer diameter of the sampling cylinder 1. An inner liner tube 3 is slidably connected to the inner side of the sampling cylinder 1. The inner liner tube 3 is a container that directly holds the soil sample. The bottom of the inner liner tube 3 abuts against the top of the cutting edge 2. A hollow tube 4 is threadedly connected to the top of the sampling cylinder 1 and is configured to penetrate the sampling cylinder 1. A hollow shell 5 is connected to the lower end of the hollow tube 4 and is slidably connected to the inner side of the sampling cylinder 1. The bottom of the hollow shell 5 abuts against the top of the inner liner tube 3.

[0024] Please see Figures 1-4 The hollow shell 5 has several evenly distributed through holes 51 at its bottom. A piston 7 is slidably connected to the inner side of the hollow shell 5. A sealing ring 71 is embedded in the outer ring wall of the piston 7, and the sealing ring 71 is slidably connected to the inner wall of the sampling cylinder 1. By setting the sealing ring 71, the sealing between the piston 7 and the hollow shell 5 can be increased. A pull rod 6 is fixedly connected to the upper end of the piston 7. The pull rod 6 is set through the hollow tube 4. An annular groove is opened in the lower section of the rod body of the pull rod 6. Multiple balls 9 are slidably connected to the inner side of the annular groove, and the balls 9 are slidably connected to the inner wall of the hollow tube 4. By setting the balls 9, the relative friction between the pull rod 6 and the hollow tube 4 can be reduced. A spring 8 is sleeved on the lower section of the rod body of the pull rod 6. One end of the spring 8 is fixedly connected to the upper end of the piston 7, and the other end of the spring 8 is fixedly connected to the inner top of the hollow shell 5. A locking block 11 is fixedly connected to the upper section of the rod body of the pull rod 6, and the locking block 11 is engaged with the hollow tube 4. Pulling the piston 7 upwards via the pull rod 6 creates negative pressure within the hollow shell 5, helping to support the soil sample inside the inner liner tube 3. The top of the hollow tube 4 has two large slots 401 and a small slot 402, symmetrically arranged. A locking block 11 engages inside the large slot 401. The width of the large and small slots 401 is the same as the locking block 11, but the depth of the large slot 401 is greater than that of the small slot 402. After the locking block 11 moves upwards along the axial direction of the hollow tube 4 with the pull rod 6, rotating the pull rod 6 causes the locking block 11 to engage in the small slot 402, thus limiting the position of the piston 7. A pull ring 10, made of stainless steel, is welded to the top of the pull rod 6. The user can pull the pull rod 6 upwards using the pull ring 10.

[0025] Please see Figures 1-2The upper outer side of the sampling cylinder 1 is provided with multiple graduated rings 15. A threaded sleeve 12 is threadedly connected to the middle of the outer side of the sampling cylinder 1. A pressure plate 13 is fixedly connected to the bottom of the threaded sleeve 12 and is slidably connected to the outer side of the sampling cylinder 1. A pointer 14 is fixedly connected to the top of the threaded sleeve 12, and the top position of the pointer 14 corresponds to the position of the graduated rings 15. The pressure plate 13 can be fixed in position after entering the soil inside the sampling cylinder 1, and the position of the pressure plate 13 can be adjusted by the threaded sleeve 12, thereby controlling the sampling depth.

[0026] The specific implementation process of this utility model is as follows: In use, firstly, insert the inner liner tube 3 from the bottom of the sampling cylinder 1, so that its top abuts against the hollow shell 5. Screw the cutting edge 2 into the bottom of the sampling cylinder 1 through the boss 201 on it, and the boss 201 abuts against the bottom of the inner liner tube 3. Then, according to the preset sampling depth, rotate the threaded sleeve 12. The threaded sleeve 12 drives the pressure plate 13 at its lower end to move up and down along the outside of the sampling cylinder 1. Observe the scale ring 15 indicated by the pointer 14, and preset the pressure plate 13 to a position at a specific height from the cutting edge 2. This height is the target sampling depth. Then, lock the threaded sleeve 12, and then vertically align the sampler with the sampling point and apply downward pressure. The cutting edge 2 begins to cut the soil, and the soil column enters the inner liner tube 3 continuously and smoothly under pressure. When the pressure plate 13 descends to contact the ground, it indicates that the sampling cylinder 1 has been pressed down to the preset depth. Stop pressing down. At this time, first pull the pull ring 10 upward, which drives the pull rod 6 and piston 7 to move upward and compress the spring 8. Once the locking block 11 rises above the top of the hollow tube 4, rotate the pull rod 6 to engage the locking block 11 in the shallower slot 402. At this point, the piston 7 is held in a higher position, creating an initial negative pressure inside the hollow shell 5, thus actively protecting the soil sample and pulling the entire sample out of the soil. After pulling it out, reverse the operation of the pull rod 6 to release the air pressure and unscrew the cutting edge 2. At this point, the inner liner tube 3 and the soil sample inside it are removed from the sampling tube 1. Then, seal both ends of the inner liner tube 3 with tape to prevent moisture evaporation and structural disturbance, and attach a label to indicate the sampling information.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A undisturbed soil column sampler for silt-retaining dams, comprising a sampling tube (1), characterized in that: The sampling cylinder (1) has a boss (201) threadedly connected to the inner side of its lower opening. A cutting edge (2) is integrally formed at the bottom of the boss (201). The upper edge of the cutting edge (2) abuts against the bottom of the sampling cylinder (1). The boss (201) is located inside the upper edge of the cutting edge (2) and is used for mounting the cutting edge (2). The outer diameter of the cutting edge (2) is the same as the outer diameter of the sampling cylinder (1). An inner liner (3) is slidably connected to the inner side of the sampling cylinder (1). The inner liner tube (3) is a container that directly holds the soil sample. The bottom of the inner liner tube (3) abuts against the top of the cutting edge (2). The top of the sampling tube (1) is connected to a hollow tube (4) by a thread. The hollow tube (4) is set through the sampling tube (1). The lower end of the hollow tube (4) is connected to a hollow shell (5). The hollow shell (5) is slidably connected to the inside of the sampling tube (1). The bottom of the hollow shell (5) abuts against the top of the inner liner tube (3).

2. The undisturbed soil column sampler for silt-retaining dams according to claim 1, characterized in that: The bottom of the hollow shell (5) is provided with several evenly distributed through holes (51). A piston (7) is slidably connected to the inner side of the hollow shell (5). A pull rod (6) is fixedly connected to the upper end of the piston (7). The pull rod (6) is set through the hollow tube (4). A spring (8) is sleeved on the lower section of the pull rod (6). One end of the spring (8) is fixedly connected to the upper end of the piston (7). The other end of the spring (8) is fixedly connected to the top of the inner side of the hollow shell (5). A locking block (11) is fixedly connected to the upper section of the pull rod (6). The locking block (11) is engaged with the hollow tube (4).

3. The undisturbed soil column sampler for silt-retaining dams according to claim 2, characterized in that: A sealing ring (71) is embedded in the outer ring wall of the piston (7), and the sealing ring (71) is slidably connected to the inner wall of the sampling cylinder (1).

4. The undisturbed soil column sampler for silt-retaining dams according to claim 2, characterized in that: The lower section of the rod (6) is provided with an annular groove, and a plurality of balls (9) are slidably connected to the inner side of the annular groove, and the balls (9) are slidably connected to the inner wall of the hollow tube (4).

5. A undisturbed soil column sampler for silt-retaining dams according to claim 2, characterized in that: The top of the hollow tube (4) has two large slots (401) and a small slot (402), which are symmetrically arranged in pairs. The card block (11) is engaged inside the large slot (401).

6. A undisturbed soil column sampler for silt-retaining dams according to claim 2, characterized in that: The top of the pull rod (6) is welded with a pull ring (10), which is made of stainless steel.

7. The undisturbed soil column sampler for silt-retaining dams according to claim 1, characterized in that: The upper outer side of the sampling cylinder (1) is provided with multiple scale rings (15). The middle outer side of the sampling cylinder (1) is connected to a threaded sleeve (12) by a thread. The bottom of the threaded sleeve (12) is fixedly connected to a pressure plate (13), and the pressure plate (13) is slidably connected to the outer side of the sampling cylinder (1). The top of the threaded sleeve (12) is fixedly connected to a pointer (14), and the top position of the pointer (14) corresponds to the position of the scale rings (15).

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