Soil sampler

Abstract

The utility model discloses a soil sampler, which belongs to the technical field of geotechnical engineering investigation equipment and comprises a rotary joint, a soil drilling pipe and a sampling pipe are mounted on the rotary joint, the soil drilling pipe is sleeved on the outer side of the sampling pipe, the upper end of the sampling pipe is rotatably connected with the rotary joint, a sealing device is mounted on the lower end face of the sampling pipe, and the sealing device is connected with the rotary joint. The closing device comprises an iris mechanism, a plurality of hydraulic blades are connected to the outer wall of the iris mechanism, a nozzle for spraying water to the position between the soil drilling pipe and the sampling pipe is installed on the rotating joint, water sprayed by the nozzle can drive the hydraulic blades to rotate, and the iris mechanism can be controlled to be closed through rotation of the hydraulic blades. According to the utility model, the recovery rate of soil sample extraction in loose and soft soil layers can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering investigation equipment, in particular to a soil sampler. Background Art

[0002] In geotechnical engineering investigation, sampling is an important way to obtain various geotechnical parameters and information. The commonly used tool for sampling is a single-acting double-tube soil sampler. The existing single-acting double-tube soil sampler consists of a high-speed rotating soil drilling pipe and a sampling pipe installed inside without rotating with the soil drilling pipe. There is a water flow passage between the inner soil drilling pipes. During the drilling process, it is necessary to continuously spray flushing fluid into the water flow passage to cool the drill bit and lubricate the drilling tool. When the drill bit reaches the target depth, the drill is lifted to bring the sample of the rock and soil layer back to the ground.

[0003] Since the bottom of the sampling pipe of the existing single-acting double-tube soil sampler is not closed, when drilling and sampling in some loose strata or soft soil strata, the fracture position of the core sample is uncertain and block dropping may occur during the drill lifting process, resulting in a low recovery rate of the retrieved core sample.

[0004] In view of the problems existing in the above-mentioned prior art, the utility model designs and manufactures a soil sampler to overcome the above defects. Content of the Utility Model

[0005] For the problems existing in the prior art, a soil sampler provided by the utility model can improve the recovery rate of soil sample extraction in loose and soft soil layers.

[0006] To achieve the above purpose, the technical scheme adopted by the utility model is as follows: a soil sampler, including a rotary joint, a soil drilling pipe and a sampling pipe are installed on the rotary joint, a drill bit is installed on the lower end face of the soil drilling pipe, the soil drilling pipe is sleeved outside the sampling pipe, and the upper end of the sampling pipe is rotatably connected with the rotary joint;

[0007] A closing device is installed on the lower end face of the sampling pipe. The closing device includes an iris mechanism. A plurality of hydraulic blades are connected to the outer wall of the iris mechanism. A nozzle for spraying water between the soil drilling pipe and the sampling pipe is installed on the rotary joint. The water sprayed by the nozzle can drive the hydraulic blades to rotate, and the rotation of the hydraulic blades can control the closing of the iris mechanism.

[0008] Preferably, the iris mechanism includes a rotary cover plate and an annular base installed at the bottom of the sampling pipe. The rotary cover plate is rotatably installed on the annular base. The hydraulic blades are fixed on the outer wall of the rotary cover plate. At least four limit columns are provided on the annular base, and a rotation groove for sliding cooperation with the limit columns is provided on the rotary cover plate;

[0009] A blade assembly is installed between the annular base and the rotating cover plate. The blade assembly includes a plurality of blades. Sliding grooves and sliding columns are respectively arranged on the upper and lower surfaces of the blades. Sliding grooves cooperating with the sliding columns are arranged on the annular base, and driving columns cooperating with the sliding grooves are arranged on the rotating cover plate.

[0010] Preferably, the rotating groove on the rotating cover plate is filled with lubricating grease before sampling. The lubricating grease can prevent rock and soil debris from entering the rotating groove before the rotating cover plate rotates.

[0011] Preferably, the inner diameters of the annular base and the rotating cover plate are equal to the inner diameter of the sampling tube.

[0012] Preferably, the axes of the annular base, the rotating cover plate, the sampling tube, and the soil drilling tube coincide with each other.

[0013] Preferably, the angles between each blade are equal, and the sum of the angles of all the blades is equal to 360 degrees.

[0014] Preferably, a limiting plate is arranged at the upper end of the limiting column, and the lower end surface of the limiting plate abuts against the rotating cover plate.

[0015] Preferably, the hydraulic blades are located in the annular space between the outer wall of the rotating cover plate and the inner wall of the soil drilling tube.

[0016] Preferably, the annular base is detachably installed at the bottom of the sampling tube.

[0017] The beneficial effects of the present utility model are as follows:

[0018] 1. An iris mechanism is installed at the lower end of the sampling tube of the present utility model. The blades of the iris mechanism close after the sampling tube reaches the predetermined depth, cutting off and sealing the sampled soil in the sampling tube, avoiding fracture or chipping of the core sample inside the sampling tube when the soil sampler is pulled out, and greatly improving the recovery rate of the core sample.

[0019] 2. A hydraulic blade is installed on the iris mechanism of the present utility model. As a driving force acts on the hydraulic blade, the rotating cover plate is controlled to rotate, realizing the automatic closing of the iris mechanism.

[0020] 3. The rotating groove on the rotating cover plate of the present utility model is filled with lubricating grease before sampling. The lubricating grease can isolate debris outside the rotating groove before the rotating cover plate rotates, avoiding debris entering the rotating groove during the collection process and affecting the closing of the iris mechanism. In addition, the grease can also play a role in lubrication and rust prevention, prolonging the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view of a soil sampler of the present utility model;

[0022] Figure 2 Schematic diagram of the structure of the annular base of a soil sampler of the present utility model;

[0023] Figure 3 Isometric view of the rotating cover plate of a soil sampler of the present utility model;

[0024] Figure 4 Top view of the rotating cover plate of a soil sampler of the present utility model;

[0025] Figure 5 Top view of the annular base of a soil sampler of the present utility model;

[0026] Figure 6 Top view of the blade of a soil sampler of the present utility model.

[0027] In the figure: 1 - swivel joint, 2 - soil drilling pipe, 3 - sampling pipe, 4 - iris mechanism, 5 - hydraulic vane, 6 - drill bit, 7 - annular base, 8 - blade, 9 - limit post, 10 - chute, 11 - limit plate, 12 - sliding groove, 13 - rotating groove, 14 - driving post, 15 - rotating cover plate, 16 - sliding post. Specific embodiments

[0028] For the convenience of those skilled in the art to understand, the present utility model will be further described below with reference to the accompanying drawings.

[0029] As Figures 1-6 shown, a soil sampler includes a swivel joint 1, a soil drilling pipe 2 and a sampling pipe 3 are installed on the swivel joint 1, a drill bit 6 is installed on the lower end face of the soil drilling pipe 2, the soil drilling pipe 2 is sleeved outside the sampling pipe 3, and the upper end of the sampling pipe 3 is rotatably connected to the swivel joint 1;

[0030] A closing device is installed on the lower end face of the sampling pipe 3 of the present utility model. The closing device includes an iris mechanism 4, several hydraulic vanes 5 are connected to the outer wall of the iris mechanism, and a nozzle for spraying water between the soil drilling pipe 2 and the sampling pipe 3 is installed on the swivel joint 1;

[0031] In addition, reaction rib plates with a reverse rotation direction but slightly shorter length than the hydraulic vanes 5 can be provided on the outer wall of the sampling pipe 3. When the water flow flows down along the water flow path, it will pass through the reaction rib plates and the hydraulic vanes 5 in sequence. When the water flow impacts on the reaction rib plates and the hydraulic vanes 5, the acting forces generated by the two are in opposite directions. Before the sampling pipe 3 contacts the soil, controlling the water flow velocity of the nozzle to reach the corresponding value can keep the sampling pipe 3 in a non-rotating state, avoiding the rotation of the sampling pipe 3 when it contacts the soil and affecting the detection results of the surface soil.

[0032] Specifically, a drilling rig circulation pump is connected to the nozzle. By changing the displacement of the drilling rig circulation pump, the flow rate of the flushing fluid ejected from the nozzle is adjusted. During the process of the drilling pipe 2 rotating and drilling downward, the displacement of the drilling rig circulation pump is small, and the flow rate of the liquid ejected from the nozzle is slow. The liquid flowing along the water flow passage acts on the hydraulic blade 5, which is not sufficient to drive the iris mechanism 4 to close.

[0033] When the sampler reaches the predetermined sampling depth, the displacement of the drilling rig circulation pump is increased, the water flow rate ejected from the nozzle becomes faster, and the high-speed water flow impacts the hydraulic blade 5, driving the hydraulic blade 5 to rotate. The rotation of the hydraulic blade 5 can control the iris mechanism 4 to close, cutting off and sealing the sampled soil in the sampling pipe 3, avoiding the fracture or chipping of the core sample inside the sampling pipe 3 when the sampler is pulled out, and greatly improving the recovery rate of the core sample.

[0034] The iris mechanism 4 of the present utility model includes a rotating cover plate 15 and an annular base 7 installed at the bottom of the sampling pipe 3. The annular base 7 is detachably installed at the bottom of the sampling pipe 3, and the rotating cover plate 15 is rotatably installed on the annular base 7. The inner diameters of the annular base 7 and the rotating cover plate 15 are equal to the inner diameter of the sampling pipe 3. As the sampler continuously drills, the soil passes through the rotating cover plate 15 and the annular base 7 in sequence and is finally collected in the sampling pipe 3.

[0035] The annular base 7 of the present utility model is provided with at least four limit posts 9, and the rotating cover plate 15 is provided with a rotating groove 13 that slidably cooperates with the limit posts 9. The upper end of the limit post 9 is provided with a limit plate 11, and the lower end surface of the limit plate 11 abuts against the rotating cover plate 15. The rotational connection between the annular base 7 and the rotating cover plate 15 is realized through the cooperation of the limit posts 9 and the rotating groove 13, and at the same time, the rotating groove 13 can also limit the rotation angle of the rotating cover plate 15. The setting of the limit plate 11 on the limit post 9 can limit the up and down movement of the rotating cover plate 15, preventing the rotating cover plate 15 from falling off the annular base 7;

[0036] A blade assembly is installed between the annular base 7 and the rotating cover plate 15 of the present utility model. The blade assembly includes a plurality of blades 8. The included angles of each blade 8 are equal, and the sum of the included angles of all the blades 8 is equal to 360 degrees, and it can completely close and seal the annular base 7 after being fully closed.

[0037] The upper and lower surfaces of the blade 8 of the present utility model are respectively provided with a chute 10 and a sliding post 16. The annular base 7 is provided with a sliding groove 12 that cooperates with the sliding post 16, and the rotating cover plate 15 is provided with a driving post 14 that cooperates with the chute 10. The hydraulic blade 5 is fixed on the outer wall of the rotating cover plate 15 and can rotate in the annular space between the outer wall of the rotating cover plate 15 and the inner wall of the drilling pipe 2;

[0038] Specifically, the water flow impacts the hydraulic blade 5 to rotate the rotating cover plate 15. After the driving column 14 on the rotating cover plate 15 abuts against the end of the sliding groove 10 and continues to move, it will drive the sliding column 16 on the blade 8 to move relatively along the sliding groove 12 on the annular base 7. During the movement, the blades 8 gather together, and finally completely enclose the annular base 7, cutting off and sealing the collected soil in the sampling tube 3.

[0039] In the utility model, the rotating groove 13 on the rotating cover plate 15 is filled with lubricating grease before sampling. The lubricating grease can prevent rock and soil debris from entering the rotating groove 13 before the rotating cover plate 15 rotates, affecting the closing of the iris mechanism 4. In addition, the grease can also play a role in lubrication and rust prevention, extending the service life of the iris mechanism 4.

[0040] Specifically, the axes of the annular base 7, the rotating cover plate 15, the sampling tube 3, and the soil drilling tube 2 coincide with each other, enabling the sampled soil to smoothly enter the interior of the sampling tube 3 to achieve the collection of core samples.

[0041] It should be understood that the use of these embodiments is only for illustrating the utility model and is not intended to limit the protection scope of the utility model. In addition, it should also be understood that after reading the technical content of the utility model, those skilled in the art can make various changes, modifications, and / or variations to the utility model, and all these equivalent forms also fall within the protection scope defined by the appended claims of this application.

Claims

1. A soil sampler, characterized in that, It includes a swivel joint (1), on which a soil drilling pipe (2) and a sampling pipe (3) are installed. A drill bit (6) is installed on the lower end face of the soil drilling pipe (2). The soil drilling pipe (2) is sleeved outside the sampling pipe (3), and the upper end of the sampling pipe (3) is rotatably connected to the swivel joint (1). A closing device is installed on the lower end face of the sampling pipe (3). The closing device includes an iris mechanism. A number of hydraulic blades (5) are connected to the outer wall of the iris mechanism. A nozzle for spraying water between the soil drilling pipe (2) and the sampling pipe (3) is installed on the swivel joint (1). The water sprayed by the nozzle can drive the hydraulic blades (5) to rotate, and the rotation of the hydraulic blades (5) can control the closing of the iris mechanism.

2. The soil sampler according to claim 1, wherein The iris mechanism includes a rotating cover plate (15) and an annular base (7) installed at the bottom of the sampling pipe (3). The rotating cover plate (15) is rotatably installed on the annular base (7). The hydraulic blades (5) are fixed on the outer wall of the rotating cover plate (15). At least four limit posts (9) are provided on the annular base (7), and a rotating groove (13) slidably matched with the limit posts (9) is provided on the rotating cover plate (15). A blade assembly is installed between the annular base (7) and the rotating cover plate (15). The blade assembly includes a number of blades (8). Sliding grooves (10) and sliding posts (16) are respectively provided on the upper and lower surfaces of the blade (8). A sliding groove (12) matched with the sliding post (16) is provided on the annular base (7), and a driving post (14) matched with the sliding groove (10) is provided on the rotating cover plate (15).

3. The soil sampler according to claim 2, wherein A limit plate (11) is provided at the upper end of the limit post (9), and the lower end face of the limit plate (11) abuts against the rotating cover plate (15).

4. The soil sampler according to claim 2, characterized in that, The rotating groove (13) on the rotating cover plate (15) is filled with lubricating grease before sampling. The lubricating grease can isolate debris outside the rotating groove (13) before the rotating cover plate (15) rotates.

5. The soil sampler according to claim 2, wherein, The inner diameters of the annular base (7) and the rotating cover plate (15) are equal to the inner diameter of the sampling pipe (3).

6. The soil sampler according to claim 2, characterized in that, The axes of the annular base (7), the rotating cover plate (15), the sampling pipe (3) and the soil drilling pipe (2) all coincide with each other.

7. The soil sampler according to claim 2, characterized in that, The angles between each blade (8) are equal, and the sum of the angles between all the blades (8) is equal to 360 degrees.

8. The soil sampler according to claim 2, characterized in that, The hydraulic blades (5) are located in the annular space between the outer wall of the rotating cover plate (15) and the inner wall of the soil drilling pipe (2).

9. The soil sampler according to claim 2, wherein, The annular base (7) is detachably installed at the bottom of the sampling pipe (3).

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