Small sample soil pore water collecting device

Abstract

The utility model discloses a small sample soil pore water collecting device which comprises a material storage assembly and a water outlet assembly, and the material storage assembly comprises a water storage barrel and a soil storage barrel; the bottom end of the soil storage barrel is connected with a first drainage pipe, and a filter screen is arranged in the first drainage pipe; the water outlet assembly comprises a pressing plate and a driving mechanism, and the edge of the pressing plate is slidably and hermetically connected with the inner side wall of the soil storage barrel. Through the design of a water outlet assembly, a driving motor enables a soil storage barrel to rotate by controlling a crankshaft, pore water in soil in the soil storage barrel is thrown to the inner side wall of the soil storage barrel under the action of centrifugal force in the rotation process of the soil storage barrel, and the water thrown out flows to the bottom of a water storage barrel and then flows into the water storage barrel through a first drainage pipe; finally, the water can be discharged into the collection container through the second drainage pipe; when the crankshaft rotates, the pressing plate is controlled to compress the soil in the soil storage barrel by controlling the air pressure, and part of pore water in the soil is extruded by the extrusion force, so that the separation efficiency of the pore water and the soil is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of soil pore water collection, in particular to a small-sample soil pore water collection device. Background Technique

[0002] Pore water refers to the groundwater mainly stored in the pores between loose sediment particles. As an important component of soil, soil pore water participates in the material cycle process occurring inside the soil, such as the migration of soluble substances, the dissolution, mineralization, nitrification, and denitrification of minerals. Analyzing the content of microorganisms and metal ions in pore water can determine the conditions of the soil and water quality in this area.

[0003] The extraction methods of pore water are generally divided into two types. One is destructive sampling, that is, non-in-situ pore water extraction, mainly carried out by means such as pressing, centrifugation, and vacuum filtration; the other is in-situ sampling, mainly by burying equipment such as ceramic tubes to take samples in-situ for a long time, which can study the dynamic changes of soil solution within a certain period, mainly the suction cup method and some micro-samplers that have emerged in recent years.

[0004] However, some existing devices for extracting pore water from soil by using the destructive sampling method have the problem of low separation efficiency. Content of the Utility Model

[0005] The utility model provides a small-sample soil pore water collection device to solve the above technical problems.

[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A small-sample soil pore water collection device includes a storage component and a water outlet component. The storage component includes a storage water bucket and a storage soil bucket rotatably arranged inside the storage water bucket; a first drain pipe is connected to the bottom end of the storage soil bucket, and a filter screen is arranged inside the first drain pipe; the water outlet component includes a pressing plate arranged inside the storage soil bucket and a driving mechanism for driving the pressing plate to move towards the bottom of the storage soil bucket, and the edge of the pressing plate is slidably and sealingly connected to the inner side wall of the storage soil bucket.

[0008] Further, in the utility model, the driving mechanism includes an air inlet pipe arranged at the top of the storage soil bucket, an air delivery pipe communicated with the air inlet pipe, a piston arranged at the end of the air delivery pipe far from the air inlet pipe, and a driving part for driving the piston to reciprocate inside the air delivery pipe; two one-way valves are arranged at intervals inside the air inlet pipe, and the flow direction of the fluid in any one-way valve is towards the inside of the storage soil bucket; the connection between the air delivery pipe and the air inlet pipe is located between the two one-way valves.

[0009] Further, in the present utility model, the driving member includes a driving motor, a crankshaft drivingly connected to the driving end of the driving motor, and a connecting rod rotatably connected to the crankshaft. One end of the crankshaft away from the driving motor is fixedly connected to the soil storage bucket; a journal is provided on the crankshaft, one end of the connecting rod is rotatably connected to the journal, and the other end is rotatably connected to the piston.

[0010] Further, in the present utility model, an exhaust pipe is provided between the one-way valve on the intake pipe close to the soil storage bucket and the soil storage bucket, and an exhaust valve is provided on the exhaust pipe.

[0011] Further, in the present utility model, a limiting sleeve is provided at the inner top of the water storage bucket, and the soil storage bucket is rotatably and sealingly connected to the limiting sleeve.

[0012] Further, in the present utility model, the first drain pipe is communicated with the inside of the water storage bucket; a second drain pipe is provided at the bottom of the water storage bucket.

[0013] Compared with the prior art, the present utility model has the following beneficial effects:

[0014] A small-sample soil pore water collection device disclosed by the present utility model, through the design of the water outlet assembly, in which the driving motor controls the crankshaft to make the soil storage bucket rotate. During the rotation of the soil storage bucket, the pore water in the soil therein is "thrown" to the inner side wall of the soil storage bucket under the action of centrifugal force. This part of the water thrown out then flows to the bottom of the water storage bucket, and then flows into the water storage bucket through the first drain pipe, and finally can be discharged into the collection container through the second drain pipe; while the crankshaft rotates, the pressure plate is controlled to compress the soil in the soil storage bucket by controlling the air pressure, and a part of the pore water in the soil is squeezed out by this extrusion force, thereby further improving the separation efficiency of the pore water and the soil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is the overall structural schematic diagram of the present utility model;

[0016] Figure 2 is Figure 1 the sectional view of

[0017] Figure 3 is Figure 1 the enlarged schematic view of part A in

[0018] In the figure: 101 - water storage bucket; 102 - soil storage bucket; 103 - first drain pipe; 201 - pressure plate; 202 - intake pipe; 203 - air delivery pipe; 204 - piston; 205 - one-way valve; 206 - driving motor; 207 - crankshaft; 208 - connecting rod; 301 - exhaust pipe; 302 - air change valve; 401 - limiting sleeve; 501 - second drain pipe. Detailed implementation mode

[0019] To make the purpose, technical solution and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in combination with embodiments and drawings. The illustrative implementation mode of the present utility model and its description are only used to explain the present utility model and shall not be used to limit the present utility model.

[0020] Embodiment

[0021] As Figures 1-3 shown, a small-sample soil pore water collection device includes a storage component and a water outlet component. The storage component includes a storage water bucket 101 and a storage soil bucket 102 rotatably arranged in the storage water bucket 101; a first drain pipe 103 is connected to the bottom end of the storage soil bucket 102, and a filter screen is arranged in the first drain pipe 103; the water outlet component includes a pressing plate 201 arranged in the storage soil bucket 102 and a driving mechanism for driving the pressing plate 201 to move towards the bottom of the storage soil bucket 102. The edge of the pressing plate 201 is slidably and sealingly connected to the inner side wall of the storage soil bucket 102. The slidable and sealing connection mode between the edge of the pressing plate 201 and the inner side wall of the storage soil bucket 102 is a prior art and will not be elaborated here.

[0022] Referring to Figure 2 , in order to facilitate the installation of the storage soil bucket 102 in the storage water bucket 101, the storage water bucket 101 is designed as a "three-section structure" in this embodiment. Specifically, the storage water bucket 101 includes a lower cylinder and an upper cylinder, and a connecting pipe located between the lower cylinder and the upper cylinder. Threads for threaded connection are processed on the outer side wall of the connecting pipe, the inner side wall of the lower cylinder and the inner side wall of the upper cylinder. The lower cylinder and the upper cylinder are connected through the connecting pipe, which is convenient for disassembly.

[0023] Specifically, in this embodiment, the driving mechanism includes an air inlet pipe 202 arranged at the top of the storage soil bucket 102, an air delivery pipe 203 communicated with the air inlet pipe 202, a piston 204 arranged at the end of the air delivery pipe 203 far from the air inlet pipe 202, and a driving member for driving the piston 204 to reciprocate in the air delivery pipe 203; two one-way valves 205 are arranged at intervals in the air inlet pipe 202, and the flow direction of the fluid in any one-way valve 205 is towards the inside of the storage soil bucket 102; the connection part of the air delivery pipe 203 and the air inlet pipe 202 is located between the two one-way valves 205.

[0024] In this embodiment, the driving member includes a driving motor 206, a crankshaft 207 drivingly connected to the driving end of the driving motor 206, and a connecting rod 208 rotatably connected to the crankshaft 207. One end of the crankshaft 207 far from the driving motor 206 is fixedly connected to the storage soil bucket 102; a journal is arranged on the crankshaft 207, one end of the connecting rod 208 is rotatably connected to the journal, and the other end is rotatably connected to the piston 204.

[0025] After the pore water collection work is completed, it is necessary to discharge the gas in the soil storage bucket 102. Therefore, to solve this problem, an exhaust pipe 301 is installed between the one-way valve 205 near the soil storage bucket 102 on the intake pipe 202 and the soil storage bucket 102, and an exhaust valve is installed on the exhaust pipe 301.

[0026] During the rotation of the soil storage bucket 102, it is prone to tilting. To solve this problem, a limiting sleeve 401 is installed at the inner top of the water storage bucket 101. The limiting sleeve 401 can be fixedly connected or rotatably connected to the water storage bucket 101. The soil storage bucket 102 is rotatably and hermetically connected to the limiting sleeve 401. In this way, during the rotation of the soil storage bucket 102, due to the existence of the limiting sleeve 401, the soil storage bucket 102 can only rotate around its own central axis, thus solving the above problem.

[0027] To facilitate the collection of the pore water flowing out of the soil, the first drain pipe 103 is communicated with the inside of the water storage bucket 101; a second drain pipe 501 is installed at the bottom of the water storage bucket 101. In this way, the pore water flowing out of the soil can be discharged into the collection container through the second drain pipe 501.

[0028] Working principle:

[0029] When it is necessary to collect the pore water in the soil, first place the soil in the soil storage bucket 102 and make the pressing plate 201 above the soil. Then the collection / extraction of the pore water in the soil can be started. The specific extraction method is as follows:

[0030] Start the drive motor 206. The drive motor 206 makes the soil storage bucket 102 rotate by controlling the crankshaft 207. During the rotation of the soil storage bucket 102, the pore water in the soil inside it is "thrown" to the inner side wall of the soil storage bucket 102 under the action of centrifugal force. This part of the water that is thrown out then flows to the bottom of the water storage bucket 101, and then flows into the water storage bucket 101 through the first drain pipe 103, and finally can be discharged into the collection container through the second drain pipe 501.

[0031] Refer to Figure 2 , during the rotation of the crankshaft 207, the crankshaft 207 controls the piston 204 to move left and right in the air delivery pipe 203 through the connecting rod 208. During the process of the piston 204 moving left and right in the air delivery pipe 203, the air pressure in the air delivery pipe 203 will change, and at the same time, the opening and closing states of the two one-way valves 205 will also change. The specific change process is as follows:

[0032] During the leftward movement of the piston 204, the air pressure in the air delivery pipe 203 gradually decreases. Then, the check valve 205 located below closes, and the check valve 205 located above opens. At this time, the outside air can enter the air inlet pipe 202 through the check valve 205 located above. During the rightward movement of the piston 204, the air pressure in the air delivery pipe 203 gradually increases. Then, the check valve 205 located above closes, and the check valve 205 located below opens. At this time, the outside air can enter the soil storage barrel 102 through the check valve 205 located below. With the reciprocating movement of the piston 204 in the air delivery pipe 203, the outside air can continuously enter the soil storage barrel 102 through the two check valves 205 and the air inlet pipe 202. This part of the air flows into the closed chamber composed of the pressing plate 201, the soil storage barrel 102, the limiting sleeve 401 and the water storage barrel 101. As the air in this closed chamber gradually increases, the air pressure inside gradually increases. A part of the pressure generated by the air pressure acts on the pressing plate 201, causing the pressing plate 201 to move towards the bottom of the soil storage barrel 102. During the movement of the pressing plate 201 towards the bottom of the soil storage barrel 102, the soil inside is gradually compressed, and a part of the pore water in the soil is thus squeezed out by this squeezing force, further improving the separation efficiency of the pore water and the soil.

[0033] Certainly, the present utility model can also have many other implementation manners. Without departing from the spirit and essence of the present utility model, those skilled in the art can make various corresponding changes and deformations according to the present utility model. However, these corresponding changes and deformations should all fall within the protection scope of the appended claims of the present utility model.

Claims

1. A small-sample soil pore water collection device, characterized in that Comprising: A material storage assembly, the material storage assembly includes a water storage bucket (101) and a soil storage bucket (102) rotatably arranged inside the water storage bucket (101); a first drain pipe (103) is connected to the bottom end of the soil storage bucket (102), and a filter screen is arranged inside the first drain pipe (103). A water outlet assembly, the water outlet assembly includes a pressing plate (201) arranged inside the soil storage bucket (102) and a driving mechanism for driving the pressing plate (201) to move towards the bottom of the soil storage bucket (102), and the edge of the pressing plate (201) is slidably and sealingly connected to the inner side wall of the soil storage bucket (102).

2. The small-sample soil pore water collection device according to claim 1, characterized in that, The driving mechanism includes an air inlet pipe (202) arranged at the top of the soil storage bucket (102), an air delivery pipe (203) communicated with the air inlet pipe (202), a piston (204) arranged at one end of the air delivery pipe (203) away from the air inlet pipe (202), and a driving part for driving the piston (204) to reciprocate inside the air delivery pipe (203); two one-way valves (205) are arranged at intervals inside the air inlet pipe (202), and the flow direction of the fluid inside any one-way valve (205) is towards the inside of the soil storage bucket (102); the connection part of the air delivery pipe (203) and the air inlet pipe (202) is located between the two one-way valves (205).

3. The small-sample soil pore water collection device according to claim 2, characterized in that, The driving part includes a driving motor (206), a crankshaft (207) drivingly connected to the driving end of the driving motor (206), and a connecting rod (208) rotatably connected to the crankshaft (207), and one end of the crankshaft (207) away from the driving motor (206) is fixedly connected to the soil storage bucket (102); a journal is arranged on the crankshaft (207), one end of the connecting rod (208) is rotatably connected to the journal, and the other end is rotatably connected to the piston (204).

4. The small-sample soil pore water collection device according to claim 2, characterized in that, An exhaust pipe (301) is arranged between the one-way valve (205) on the air inlet pipe (202) close to the soil storage bucket (102) and the soil storage bucket (102), and an exhaust valve is arranged on the exhaust pipe (301).

5. The small-sample soil pore water collection device according to claim 1, wherein A limiting sleeve (401) is arranged at the inner top of the water storage bucket (101), and the soil storage bucket (102) is rotatably and sealingly connected to the limiting sleeve (401).

6. The small-sample soil pore water collection device according to claim 5, characterized in that The first drain pipe (103) is communicated with the inside of the water storage bucket (101); a second drain pipe (501) is arranged at the bottom of the water storage bucket (101).

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