Modularized soil leachate sampling device

Abstract

The utility model discloses a modularized soil leachate sampling device and relates to the technical field of agricultural environment monitoring. The device comprises an underground sampling unit and an earth surface sampling unit, the underground unit is provided with a water storage part and a rotatable adjusting disc, a filtering head with a three-stage gradient filtering structure is installed on the outer edge of the adjusting disc, and linear adjustment of the sampling depth is achieved by rotating the adjusting disc; the earth surface unit comprises a plurality of water collecting bottles and is connected with the underground unit through a water pump, the water collecting bottles are provided with rinsing drainage pipelines and water taking valves to separate waste liquid from effective samples, and cross contamination is avoided. The control unit integrates a single-chip microcomputer, a sensor and a wireless module, and supports remote monitoring and solar power supply. According to the utility model, the functions of flexible adjustment of sampling depth, multi-layer filtration, blockage prevention and automatic rinsing are realized through modular design, the accuracy, reliability and long-term monitoring efficiency of farmland leachate sampling are effectively improved, and the device is suitable for dynamic water quality monitoring in a complex waterflooding environment.

Description

Technical Field

[0001] This utility model relates to the field of agricultural environmental monitoring technology, specifically a modular soil leachate sampling device. Background Technology

[0002] Soil leachate is a significant carrier of non-point source pollution in farmland, and its water quality parameters (such as nitrogen and phosphorus concentrations) directly affect the surrounding water environment. Currently, soil leachate sampling mainly relies on manual sampling or fixed monitoring equipment. Manual sampling involves operators using simple samplers to manually record data, which is inefficient, has poor spatiotemporal representativeness, and cannot monitor dynamic changes in real time. While some studies use buried sensors or fixed sampling stations, these devices are bulky, costly, and cannot be flexibly adjusted after installation. Furthermore, prolonged immersion can lead to sensor drift or clogging, making them unsuitable for the complex flooded environment of farmland.

[0003] An existing Chinese patent (CN220650173U) discloses a device for stratified collection of soil leachate, which divides the collection tube into multiple sectors to collect leachate at different depths. However, existing soil leachate sampling devices still have the following problems:

[0004] First, the sampling depth cannot be linearly varied, making sampling inflexible. Second, the problem of separating the rinsing waste liquid from the effective sample has not been solved, which can easily cause cross-contamination and affect subsequent laboratory analysis. Third, suspended particles in the leachate can easily clog the filter head, and the existing technology does not provide a convenient maintenance solution. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a modular soil leachate sampling device to solve the problems of insufficient sampling operation flexibility, sampling pollution and equipment blockage in the prior art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a modular soil leachate sampling device, including an underground sampling unit and a surface sampling unit. The underground sampling unit is provided with a water storage section inside, and an adjustment plate is provided on one side of the water storage section. A filter head is provided near the outer edge of the adjustment plate.

[0007] The surface sampling unit is equipped with multiple water collection bottles. The top of the water collection bottle is connected to the water storage unit through a hose. A water pump is installed on the hose. The bottom of the water collection bottle is equipped with a drain pipe with a solenoid valve, and the body of the water collection bottle is equipped with a water intake pipe with a water intake valve.

[0008] In a preferred embodiment, the underground sampling unit is equipped with a waterproof outer shell, and the flexible hose at the top of the water collection bottle is connected to the waterproof outer shell. The waterproof outer shell is equipped with a water passage, and one end of the water passage forms a water intake hole, which is located in the water storage section.

[0009] In a preferred embodiment, the surface sampling unit is further equipped with a control unit, which includes a microcontroller and a wireless transmission module. The microcontroller is connected to a probe via a wire, and the probe is located in the underground sampling unit.

[0010] In a preferred embodiment, the underground sampling unit has two waterproof housings inside, with the probe housed in one of the waterproof housings and the probe's detection end located in the water storage section.

[0011] In a preferred embodiment, the control unit further includes a solar panel and a power module. The microcontroller is electrically connected to the power module, the water pump, and the solenoid valve. The power module is powered by the solar panel.

[0012] The wireless transmission module connects to the microcontroller and uploads the data received by the microcontroller to the remote terminal.

[0013] In a preferred embodiment, the adjusting disc is movably mounted on one side of the water storage section via an annular groove, and the adjusting disc rotates to adjust the water intake point height of the filter head.

[0014] In a preferred embodiment, the filter head has a cylindrical structure, and inside the filter head, from the water inlet to the water outlet, there are sequentially arranged a stainless steel screen, a non-woven fabric filter layer, and a polypropylene filter element.

[0015] In a preferred embodiment, the surface sampling unit is fixed to the plate and is placed above the drainage ditch via the plate.

[0016] The modular soil leachate sampling device provided by this utility model, by adopting the above-described structure, has the following beneficial effects:

[0017] (1) The vertical position of the filter head can be adjusted by rotating the adjustment dial to achieve linear change of sampling depth;

[0018] (2) Before sampling, the sample is rinsed with the sample solution and then discharged to avoid contamination of the current sample by the sample in the water collection bottle, thus ensuring the reliability of the sampling.

[0019] (3) The multi-layer filter structure inside the filter head achieves the purpose of preventing the sampling port from clogging, and the filter head can also be quickly replaced. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 2 This is a side cross-sectional structural diagram of the underground sampling unit of this utility model.

[0023] Figure 3 This is a schematic diagram of the orthographic structure of the underground sampling unit of this utility model.

[0024] Figure 4 This is a schematic diagram of the water collecting bottle structure of this utility model.

[0025] Figure 5 This is a schematic diagram of the control unit structure of this utility model.

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the filter head of this utility model.

[0027] In the diagram: Underground sampling unit 1, water storage unit 11, regulating plate 12, filter head 13, stainless steel screen 131, non-woven filter layer 132, polypropylene filter element 133, waterproof shell 14, probe 15, water intake hole 16, surface sampling unit 2, water pump 21, water collection bottle 22, solenoid valve 23, water intake valve 24, drainage ditch 25, control unit 3, microcontroller 31, wireless transmission module 32, solar panel 33, power module 34. Detailed Implementation

[0028] like Figure 1-6 In the present invention, a modular soil leachate sampling device includes an underground sampling unit 1 and a surface sampling unit 2. The underground sampling unit 1 is provided with a water storage section 11, and an adjustment plate 12 is provided on one side of the water storage section 11. A filter head 13 is provided near the outer edge of the adjustment plate 12.

[0029] The surface sampling unit 2 is equipped with multiple water collection bottles 22. The top of the water collection bottle 22 is connected to the water storage unit 11 through a hose. A water pump 21 is installed on the hose. The bottom of the water collection bottle 22 is equipped with a drainage pipe with a solenoid valve 23. The body of the water collection bottle 22 is equipped with a water intake pipe with a water intake valve 24.

[0030] In a preferred embodiment, the underground sampling unit 1 is provided with a waterproof outer shell 14, the hose at the top of the water collection bottle 22 is connected to the waterproof outer shell 14, the waterproof outer shell 14 is provided with a water passage, one end of the water passage forms a water intake hole 16, and the water intake hole 16 is located in the water storage part 11.

[0031] In a preferred embodiment, the surface sampling unit 2 is further equipped with a control unit 3, which includes a microcontroller 31 and a wireless transmission module 32. The microcontroller 31 is connected to a probe 15 via a wire, and the probe 15 is located in the underground sampling unit 1.

[0032] In a preferred embodiment, the underground sampling unit 1 is provided with two waterproof housings 14, and the probe 15 is disposed in one of the waterproof housings 14, with the probe 15's detection end located in the water storage section 11.

[0033] In a preferred embodiment, the control unit 3 further includes a solar panel 33 and a power module 34. The microcontroller 31 is electrically connected to the power module 34, the water pump 21, and the solenoid valve 23. The power module 34 is powered by the solar panel 33.

[0034] The wireless transmission module 32 is connected to the microcontroller 31 and uploads the data received by the microcontroller 31 to the remote terminal. The wireless transmission module 32 is an NB-IoT module with a built-in SIM card. It uploads data and receives remote commands every 30 minutes.

[0035] In a preferred embodiment, the adjusting disc 12 is movably mounted on one side of the water storage section 11 via an annular groove, and the adjusting disc 12 rotates to adjust the water intake point height of the filter head 13.

[0036] In a preferred embodiment, the filter head 13 has a cylindrical structure, and the filter head 13 contains a stainless steel screen 131, a non-woven fabric filter layer 132, and a polypropylene filter element 133 arranged sequentially from the water inlet end to the water outlet end.

[0037] In a preferred embodiment, the surface sampling unit 2 is fixed to the plate and is placed above the drainage ditch 25 via the plate.

[0038] The modular soil leachate sampling device disclosed in this utility model, when performing sampling operations:

[0039] (1) Sampling depth adjustment

[0040] The operator rotates the adjustment disc 12 to align the target filter head 13 with the predetermined sampling depth (e.g., 20cm).

[0041] (2) Washing and sampling

[0042] Rinsing stage: The microcontroller 31 starts the water pump 21 and runs for 1 minute to pump the residual liquid in the water storage section 11 into the water collection bottle 22. Then, the solenoid valve 23 is opened to discharge the rinsing waste liquid into the drainage ditch 25.

[0043] Formal sampling: Pump 21 runs again for 3 minutes, and fresh leachate enters collection bottle 22 through filter head 13. After sampling, the water valve 24 can be connected to a syringe to extract the sample, avoiding the need to open the bottle.

[0044] (3) Anti-blocking maintenance

[0045] When the pressure difference of filter head 13 exceeds 10 kPa (judged by changes in water pump current), filter head 13 can be unscrewed counterclockwise for replacement. The spare filter head uses a snap-on design, and the replacement process takes no more than 2 minutes.

Claims

1. A modular soil leachate sampling device, characterized by: It includes an underground sampling unit (1) and a surface sampling unit (2). The underground sampling unit (1) is equipped with a water storage section (11). An adjustment plate (12) is provided on one side of the water storage section (11). A filter head (13) is provided near the outer edge of the adjustment plate (12). The surface sampling unit (2) is equipped with multiple water collection bottles (22). The top of the water collection bottle (22) is connected to the water storage unit (11) through a hose. A water pump (21) is installed on the hose. The bottom of the water collection bottle (22) is equipped with a drainage pipe with a solenoid valve (23). The body of the water collection bottle (22) is equipped with a water intake pipe with a water intake valve (24).

2. The modular soil leachate sampling device of claim 1, wherein: The underground sampling unit (1) is equipped with a waterproof shell (14). The hose at the top of the water collection bottle (22) is connected to the waterproof shell (14). The waterproof shell (14) is equipped with a water passage, and one end of the water passage forms a water intake hole (16). The water intake hole (16) is located in the water storage part (11).

3. A modular soil leachate sampling device according to claim 2, wherein: The surface sampling unit (2) is also equipped with a control unit (3), which is equipped with a microcontroller (31) and a wireless transmission module (32). The microcontroller (31) is connected to a probe (15) via a wire, and the probe (15) is located in the underground sampling unit (1).

4. A modular soil leachate sampling device according to claim 3, wherein: The underground sampling unit (1) is equipped with two waterproof shells (14), and the probe (15) is installed in one of the waterproof shells (14), with the probe (15)'s detection end located in the water storage section (11).

5. The modular soil leachate sampling device of claim 3, wherein: The control unit (3) also includes a solar panel (33) and a power module (34). The microcontroller (31) is electrically connected to the power module (34), the water pump (21), and the solenoid valve (23). The power module (34) is powered by the solar panel (33). The wireless transmission module (32) and the microcontroller (31) transmit the data received by the microcontroller (31) to the remote terminal.

6. The modular soil leachate sampling device of claim 1, wherein: The regulating disc (12) is movably installed on one side of the water storage part (11) through an annular groove. The regulating disc (12) rotates to adjust the water intake point height of the filter head (13).

7. The modular soil leachate sampling device of claim 1, wherein: The filter head (13) has a cylindrical structure. Inside the filter head (13), from the water inlet end to the water outlet end, there are stainless steel screen (131), non-woven filter layer (132) and polypropylene filter element (133) in sequence.

8. The modular soil leachate sampling device of claim 1, wherein: The surface sampling unit (2) is fixed on the plate and is placed above the drainage ditch (25) through the plate.

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