A soil heavy metal monitoring device

Abstract

The present invention relates to the technical field of monitoring devices, and specifically to a soil heavy metal monitoring device, comprising a positioning plate, a sampling rod fixedly installed at the bottom of the positioning plate, a collecting column groove provided inside the sampling rod, and the collecting column groove is communicated with a collecting shell, a stirring assembly rotatably installed at the bottom of the collecting column groove through a bearing, the stirring assembly comprising a homogenizing plate, a sealing plate that slides up and down is provided on the inner side of the collecting column groove, a water-absorbing cotton is fixedly installed on the top of the sealing plate, and the sealing plate and the water-absorbing cotton move up and down to complete sampling and cleaning work; the present invention adopts the design of water-absorbing cotton to optimize the process of groundwater sampling, and can effectively transport the groundwater to the ground for testing, which not only significantly reduces the damage to the surrounding soil environment and reduces the impact on the soil ecology, but is also particularly suitable for sampling a small amount of groundwater and enhances the sampling efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring devices, in particular to a soil heavy metal monitoring device. Background Art

[0002] Soil heavy metal monitoring devices involve multiple fields, including environmental science, soil science, chemical analysis, sensor technology, etc., and the understanding of the sources of heavy metal pollution and its impact on ecology and human health. Combined with the limitations of traditional chemical analysis methods, advanced electrochemical, spectral and nanosensor technologies are used to achieve high-sensitivity and rapid response on-site detection. At the same time, portable equipment is used to meet field monitoring needs, and real-time data processing and analysis are carried out with the help of the Internet of Things and big data technologies to support scientific decision-making and environmental governance.

[0003] Heavy metals such as lead, cadmium, mercury, and arsenic are common sources of agricultural fertilizers. The accumulation of heavy metals in the soil can have serious impacts on plant, animal, and human health, leading to ecosystem imbalance and soil quality degradation. The shallow groundwater beneath the surface of farmland is easily replenished by precipitation, but the water volume is small and easily polluted.

[0004] Existing general heavy metal pollution assessments, such as vegetable safety monitoring, usually collect data from the surface 0-20 cm of soil. This depth is the main distribution area of ​​vegetable roots and directly affects the crops' absorption of heavy metals. If deep-rooted vegetables such as radishes and potatoes are planted, the depth can be expanded to 40-60 cm to cover the range of their root activity.

[0005] Chinese patent publication number CN110967388B discloses an in-situ soil heavy metal monitor, comprising an anode, an anode chamber, a cathode, and an ion exchange membrane. The monitor can be buried in the soil for a long time and can achieve continuous real-time monitoring of soil heavy metals with a high degree of automation.

[0006] The Chinese patent with the announcement number CN113758773B discloses a deep soil heavy metal content monitor and its monitoring method, including a connecting cap, a main tube, and an introduction sleeve, which interact with the outside world to form data. It can be embedded in the soil to monitor the changes of heavy metals in the deep soil and control changes in the soil environment.

[0007] In the above-mentioned and similar existing technologies, after the monitoring probe is buried underground, a large number of active sites are present on its surface. These sites can preferentially adsorb heavy metal ions with high charge density. During long-term contact, these heavy metal ions gradually occupy the active sites and form stable chemical bonds with the probe material, resulting in the occurrence of adsorption residue. The adsorbed cadmium, lead and other ions are prone to form a "memory effect", which not only reduces the monitoring ability of the probe, but may also cause it to be unable to effectively detect new heavy metal pollutants. In addition, the probe is affected by changes in humidity and pH in the soil environment, and is prone to electrochemical corrosion, which leads to the formation of micropores or oxide layers on the surface. These micropores and oxide layers further adsorb heavy metal ions through the ion exchange mechanism, forming irreversible adsorption. This irreversible adsorption not only increases the difficulty of subsequent cleaning and maintenance, but may also cause the probe to react laggingly to the heavy metal concentration in the soil during the monitoring process, affecting the effectiveness and reliability of real-time monitoring.

[0008] Therefore, the present invention provides a soil heavy metal monitoring device that can be buried underground to periodically sample and detect soil heavy metals, thereby completing long-term monitoring. Summary of the Invention

[0009] In order to solve the problem that the monitoring equipment in the existing technology is easily buried underground for a long time, which leads to a decrease in detection ability, a soil heavy metal monitoring device is designed.

[0010] The technical solution adopted by the present invention to solve its technical problems is: a soil heavy metal monitoring device, comprising a positioning plate, a fixed column is fixedly installed on the top of the positioning plate, a collecting shell is fixedly installed on one side of the fixed column, and a water storage tank is fixedly installed on the other side of the fixed column, a detection probe is installed through the interior of the collecting shell, a sampling rod is fixedly installed on the bottom of the positioning plate, a collecting column groove is provided inside the sampling rod, and the collecting column groove is communicated with the collecting shell, a stirring assembly is rotatably installed on the bottom of the collecting column groove through a bearing, and the stirring assembly includes a homogenizing plate, a sealing plate that slides up and down is provided on the inner side of the collecting column groove, a water-absorbing cotton is fixedly installed on the top of the sealing plate, and the sealing plate and the water-absorbing cotton move up and down to complete sampling and cleaning work; the stirring assembly is assembled so that when the telescopic rod drives the water-absorbing cotton to take samples, the sample liquid is homogenized by the homogenizing plate, and after sampling, the clean water can be stirred for comprehensive cleaning.

[0011] Furthermore, an oblique flow hole is provided through the interior of the fixed column, and both ends of the oblique flow hole are communicated with the inner sides of the collecting shell and the collecting column slot respectively, and one end of the oblique flow hole communicating with the collecting column slot is higher than the other end.

[0012] Furthermore, a signal transmitter is fixedly installed on one side of the collection shell, the signal transmitter is fixedly connected to the detection probe, a water outlet pipe is installed through the bottom of the collection shell, and a solenoid valve is fixedly installed on the outside of the water outlet pipe.

[0013] Furthermore, an annular groove is provided inside the sampling rod, and the annular groove is close to the bottom of the sampling rod. A plurality of leakage holes are provided on the surface of the sampling rod in a circular row, and a filter is fixedly installed inside the leakage holes. The leakage holes are communicated with the annular groove, and the bottom of the leakage holes is higher than the inner side of the bottom wall of the annular groove.

[0014] Furthermore, the interior of the sampling rod is provided with a plurality of through holes arranged in a circular row, and both ends of the through holes are respectively communicated with the inner sides of the annular groove and the collecting column groove. The bottom of the annular groove is provided with a plurality of reflow channels, and the positions of the reflow channels correspond one to one to the positions of the through holes.

[0015] Furthermore, the homogenizing disk is rotatably mounted on the inner side of the bottom wall of the collecting column slot through a bearing, a driving rod is fixedly mounted on the top of the homogenizing disk, two spiral guide grooves are provided on the outer side of the driving rod, and a plurality of receiving grooves are provided in a circular array on the top of the homogenizing disk, and an elastic thin tube is fixedly mounted on the inner side of the bottom wall of the receiving groove.

[0016] Furthermore, a telescopic rod is fixedly installed on the top of the fixed column, and the sealing plate is fixedly connected to the output end of the telescopic rod. A movable column groove is opened inside the telescopic rod and the sealing plate, and the movable column groove is located on the outside of the driving rod. Two symmetrical guide rods are fixedly installed on the inner wall of the movable column groove, and the two guide rods are respectively located on the inner sides of the two spiral guide grooves.

[0017] Furthermore, a balancing pipe is installed through the top of the water tank, and a water inlet valve is installed through one side of the water tank.

[0018] Furthermore, a water supply hole is provided inside the sampling rod, one end of the water supply hole is communicated with the inner side of the water tank, and the other end is communicated with the inner side of the annular groove, and a solenoid valve 2 is fixedly installed on the end of the water supply hole that is communicated with the water tank.

[0019] Beneficial effects of the present invention:

[0020] (1) The soil heavy metal monitoring device described in the present invention adopts a water-absorbing cotton design, which is intended to optimize the groundwater sampling process. Whenever the groundwater inside the sampling rod accumulates to a certain level, the water-absorbing cotton can effectively transport the groundwater to the ground for detection through its excellent water absorption performance, reducing the corrosion and wear problems of the sampling equipment caused by long-term contact with the soil. Combined with the flushing effect of the oblique flow hole, it can prevent the "memory effect" caused by the attachment of heavy metals, thereby extending the service life of the detection equipment. In addition, the water-absorbing and pressurized water-discharging principle of the water-absorbing cotton and the use of the sealing plate can reduce the residual groundwater inside the rod, realize the sampling of a small amount of groundwater, not only significantly reducing the damage to the surrounding soil environment and reducing the impact on the soil ecology, but also enhancing the sampling efficiency.

[0021] (2) The soil heavy metal monitoring device described in the present invention adopts a stirring component design. When the water-absorbing cotton is about to absorb groundwater, the groundwater collected for a long time can be stirred and homogenized before absorption. The groundwater is maintained in an in-situ suspended state to ensure that the sedimented heavy metal particles are fully mixed, and the spatial heterogeneity of the sample is eliminated. It can avoid the deviation of metal ion distribution caused by gravity sedimentation and prevent groundwater precipitation from reducing the accuracy of detection.

[0022] (3) The soil heavy metal monitoring device described in the present invention has a quantitative water storage tank design, which automatically draws clean water from the water storage tank into the inner side of the collecting rod for cleaning during the process of drawing groundwater. It cooperates with the stirring component to achieve stirring and cleaning of the inner side of the collecting rod. The fluid shear force and vortex effect generated by the homogenizing disk make the clean water form a high-speed turbulent state, effectively stripping off the adsorbed heavy metal particles and colloidal substances remaining in the sampling area, preventing the residual groundwater from affecting the next test result. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the monitoring device of the present invention;

[0025] Figure 2 Schematic diagram of the cross-sectional structure of the monitoring device of the present invention;

[0026] Figure 3 It is a schematic diagram of the cross-sectional three-dimensional structure of the sampling rod of the present invention;

[0027] Figure 4 For the present invention Figure 3 A local enlarged structural diagram of point A;

[0028] Figure 5 For the present invention Figure 3A schematic diagram of the partially enlarged structure at point B;

[0029] Figure 6 is a schematic diagram of the three-dimensional structure of the stirring assembly of the present invention;

[0030] Figure 7 For the present invention Figure 6 A schematic diagram of the partially enlarged structure at point C;

[0031] Figure 8 Schematic diagram of the three-dimensional structure of the telescopic rod of the present invention;

[0032] Figure 9 For the present invention Figure 8 Schematic diagram of the local enlarged structure at point D.

[0033] In the figure: 1. Positioning plate; 2. Fixed column; 3. Oblique flow hole; 4. Collecting shell; 5. Signal transmitter; 6. Detection probe; 7. Water outlet pipe; 8. Solenoid valve 1; 9. Sampling rod; 10. Collecting column slot; 11. Ring groove; 12. Leakage hole; 13. Filter screen; 14. Through hole; 15. Return channel; 16. Stirring assembly; 161. Homogenizing disk; 162. Driving rod; 163. Spiral guide groove; 164. Storage groove; 165. Elastic thin tube; 17. Telescopic rod; 18. Sealing plate; 19. Water-absorbing cotton; 20. Movable column slot; 21. Guide rod; 22. Water storage tank; 23. Balance pipe; 24. Water inlet valve; 25. Water delivery hole; 26. Solenoid valve 2. DETAILED DESCRIPTION

[0034] In order to make the technical means, technical features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0035] Example: Figures 1-9 As shown, a soil heavy metal monitoring device described in the present invention includes a positioning plate 1, a fixing column 2 is fixedly installed on the top of the positioning plate 1, a collecting shell 4 is fixedly installed on one side of the fixing column 2, an oblique flow hole 3 is opened through the interior of the fixing column 2, both ends of the oblique flow hole 3 are respectively communicated with the collecting shell 4 and the inner side of the collecting column groove 10, and the end of the oblique flow hole 3 communicated with the collecting column groove 10 is higher than the other end, a detection probe 6 is installed through the interior of the collecting shell 4, a signal transmitter 5 is fixedly installed on one side of the collecting shell 4, and the signal transmitter 5 is fixedly connected to the detection probe 6, a water outlet pipe 7 is installed through the bottom of the collecting shell 4, and a solenoid valve 8 is fixedly installed on the outside of the water outlet pipe 7.

[0036] Specifically, a plurality of positioning rods are provided at the bottom of the positioning plate 1. By inserting the positioning rods into the ground, the positioning plate 1 is fixedly installed. The positioning plate 1 can provide a stable support for the fixing column 2. The oblique flow hole 3 can provide a channel for the liquid inside the fixing column 2 to flow out to the outside. When the water-absorbing cotton 19 is squeezed by the inner side of the top wall of the collecting column groove 10, the liquid in the water-absorbing cotton 19 can flow out into the collecting shell 4 through the oblique flow hole 3. The collecting shell 4 can provide a penetrating support for the detection probe 6. When the groundwater taken out is stored in the collecting shell 4, the detection probe 6 can detect the heavy metal content in the groundwater. The detection results are transmitted to the central processing equipment through the signal transmitter 5. The outlet pipe 7 can provide a channel for the liquid in the collecting shell 4 to flow out. When the solenoid valve 8 is started and opened, the liquid in the collecting shell 4 will flow out through the outlet pipe 7. The wastewater and clean water can be collected centrally through the collection device to reduce the impact on the surface soil. The design of the oblique flow hole 3 enables the clean water to flush the detection probe 6 when it flows out, thereby improving the cleaning effect of the detection probe 6.

[0037] In this embodiment, a sampling rod 9 is fixedly installed at the bottom of the positioning disk 1, and a collecting column groove 10 is opened inside the sampling rod 9, and the collecting column groove 10 is communicated with the collecting shell 4. An annular groove 11 is opened inside the sampling rod 9, and the annular groove 11 is close to the bottom of the sampling rod 9. The surface of the sampling rod 9 is circumferentially arranged with a plurality of leakage holes 12, and a filter screen 13 is fixedly installed inside the leakage hole 12. The leakage hole 12 is communicated with the annular groove 11, and the bottom of the leakage hole 12 is higher than the inner side of the bottom wall of the annular groove 11. A plurality of through holes 14 are opened inside the sampling rod 9 in a circumferential row, and the two ends of the through hole 14 are respectively communicated with the inner side of the annular groove 11 and the collecting column groove 10. A plurality of return channels 15 are opened at the bottom of the annular groove 11, and the positions of the return channels 15 and the through holes 14 correspond one to one.

[0038] Specifically, the positioning plate 1 can provide a stable support for the sampling rod 9, the sampling rod 9 can provide a space for the collection column groove 10, the sampling column groove is used to provide a channel for the sealing plate 18 and the water-absorbing cotton 19 to move up and down, the filter 13 can filter the soil outside, so that the groundwater in the soil can penetrate through the filter 13 into the inner side of the annular groove 11, and pass through the through hole 14 into the inner side of the sampling column groove, so that the water-absorbing cotton 19 can contact with the groundwater for sampling, and the annular groove 11 can be a return channel 1 The backflow channel 15 not only guides the liquid in the annular groove 11 to the inner side of the sampling column groove, but also when the sealing plate 18 moves downward to contact the water surface, the sealing plate 18 presses the liquid in the inner side of the sampling column groove downward, so that the liquid in the inner side of the sampling column groove flows back to the inner side of the annular groove 11 through the backflow channel 15, thereby raising the water level of the liquid, so that the liquid can fully contact with the water-absorbing cotton 19 on the top of the sealing plate 18, ensuring that the water-absorbing cotton 19 can fully contact with the liquid in the inner side of the sampling column groove.

[0039] In this embodiment, a stirring assembly 16 is rotatably installed at the bottom of the collecting column trough 10 through a bearing. The stirring assembly 16 is assembled so that when the telescopic rod 17 drives the water-absorbing cotton 19 to take samples, the sample liquid is homogenized through the homogenizing disk 161, and after sampling, the clean water can be stirred for comprehensive cleaning. The stirring assembly 16 includes a homogenizing disk 161, which is rotatably installed on the inner side of the bottom wall of the collecting column trough 10 through a bearing. A driving rod 162 is fixedly installed on the top of the homogenizing disk 161, and two spiral guide grooves 163 are provided on the outer side of the driving rod 162. A plurality of receiving grooves 164 are provided in a circular array on the top of the homogenizing disk 161, and an elastic thin tube 165 is fixedly installed on the inner side of the bottom wall of the receiving groove 164.

[0040] Specifically, the collecting column trough 10 can provide a rotating support for the collecting plate through the bearing, the collecting plate can provide a stable support for the elastic thin tube 165, the receiving groove 164 can provide a receiving space for the elastic thin tube 165, and the spiral guide groove 163 can provide a resistance to the guide rod 21. When the spiral guide groove 163 and the guide rod 21 conflict with each other, the driving rod 162 drives the homogenizing plate 161 and the multiple elastic thin tubes 165 to rotate. When the liquid in the collecting column trough 10 is groundwater, the rotation of the homogenizing plate 161 can prevent the groundwater from settling, and stir and homogenize the groundwater. The sewage is maintained in an in-situ suspended state to ensure that the sedimented heavy metal particles are fully mixed, so as to eliminate the spatial heterogeneity of the sample and avoid the deviation of the metal ion distribution caused by gravity sedimentation. At the same time, when the liquid in the collection column tank 10 is clean water, the rotation of the homogenizing disk 161 can drive the clean water to stir. The fluid shear force and vortex effect generated by the homogenizing disk 161 can make the clean water form a high-speed turbulent state, effectively stripping off the adsorbed heavy metal particles and colloidal substances remaining in the sampling area, so that the clean water can fully clean the bottom of the collection column tank 10, reduce the residual groundwater, and thus improve the accuracy of the detection.

[0041] In this embodiment, a sealing plate 18 that slides up and down is provided on the inner side of the collecting column slot 10, and a water-absorbing cotton 19 is fixedly installed on the top of the sealing plate 18. The sealing plate 18 and the output end of the water-absorbing cotton 19 move up and down to complete the sampling and cleaning work; a telescopic rod 17 is fixedly installed on the top of the fixed column 2, and the sealing plate 18 is fixedly connected to the output end of the telescopic rod 17. A movable column slot 20 is opened inside the telescopic rod 17 and the sealing plate 18, and the movable column slot 20 is located on the outside of the driving rod 162. Two symmetrical guide rods 21 are fixedly installed on the inner wall of the movable column slot 20, and the two guide rods 21 are respectively located on the inner sides of the two spiral guide grooves 163.

[0042] Specifically, the driving force of the sealing plate 18 that slides up and down can be an electrically driven telescopic rod 17. When the groundwater inside the collecting column trough 10 is collected to a certain extent, the telescopic rod 17 first starts to move upward for a distance, and stirs the groundwater through the stirring component 16. Then the telescopic rod 17 drives the water-absorbing cotton 19 to move downward to the bottom to absorb the groundwater, and then moves upward to the top to squeeze the groundwater into the collecting shell 4 for testing. After that, it drives the water-absorbing cotton 19 to move downward to the bottom to absorb clean water, and then moves upward to the top to squeeze the clean water into the collecting shell 4 for cleaning, and finally resets; the driving force of the sealing plate 18 that slides up and down can be a manual T-shaped rod. When the groundwater inside the collecting column trough 10 is collected to a certain extent, the staff can grab the T-shaped rod exposed to the outside and move it up and down for testing and cleaning. These are just two feasible implementation methods. Any other feasible implementation method can replace this sliding adjustment device.

[0043] In this embodiment, a water tank 22 is fixedly installed on the other side of the fixed column 2, a balancing pipe 23 is installed through the top of the water tank 22, a water inlet valve 24 is installed through one side of the water tank 22, and a water hole 25 is opened through the inside of the sampling rod 9. One end of the water hole 25 is communicated with the inner side of the water tank 22, and the other end is communicated with the inner side of the annular groove 11. A solenoid valve 26 is fixedly installed on the end of the water hole 25 that is communicated with the water tank 22.

[0044] Specifically, the water tank 22 can store a certain amount of clean water. When the telescopic rod 17 drives the sealing plate 18 to move to the top, the clean water inside the water tank 22 will move into the annular groove 11 through the water transfer hole 25 under the action of the pressure difference. The balance pipe 23 can provide air pressure balance for the air flow inside the water tank 22 and the sampling rod 9, which is convenient for the up and down movement of the sealing plate 18. The water inlet valve 24 can be connected to the external clean water pipe to regularly replenish a certain amount of clean water into the water tank 22. When the clean water in the water tank 22 flows into the annular groove 11, the level of the clean water will not exceed the height of the leakage hole 12, thereby preventing the clean water from moving into the soil through the leakage hole 12, thereby preventing the next test result from being affected.

[0045] Working principle: First, a hole of the same diameter as the sampling rod 9 is drilled on the ground, and the sampling rod 9 is inserted into the ground and fixed by the positioning rod at the bottom of the positioning plate 1. Then, the groundwater in the underground soil penetrates through the filter 13 and enters the inner side of the annular groove 11, so that the groundwater inside the annular groove 11 flows along the return channel 15 to the inner side of the collection column groove 10 and stays on the top of the homogenizing plate 161. When the groundwater inside the collection column groove 10 is collected to a certain extent, the staff starts the electromagnetic valve 26 to open, so that the water storage tank 22 The water delivery hole 25 is connected to the annular groove 11, and the telescopic rod 17 is started to retract, so that the output end of the telescopic rod 17 moves upward. At the same time, the output end of the telescopic rod 17 drives the two inner guide rods 21 to move upward, so that the guide rods 21 drive the driving rod 162 and the homogenizing disk 161 to rotate by the interference effect with the spiral guide groove 163. The homogenizing disk 161 drives the multiple elastic thin tubes 165 to rotate, so that the elastic thin tubes 165 stir the groundwater collected inside the collection column trough 10, preventing the groundwater from settling due to long-term collection.

[0046] Then, the telescopic rod 17 is started to move downward, so that the telescopic rod 17 drives the sealing plate 18 and the water-absorbing cotton 19 to move downward. When the sealing plate 18 contacts the top of the homogenizing disk 161, the elastic thin tube 165 enters the inner side of the collecting tank under the action of pressure. At the same time, the sealing plate 18 squeezes the groundwater so that the groundwater flows through the return channel 15 to the inner side of the annular groove 11, causing the groundwater to submerge the water-absorbing cotton 19. The water-absorbing cotton 19 draws the groundwater for storage, and the telescopic rod 17 contracts again to drive the water-absorbing cotton 19 to move upward along the inner side of the collecting column groove 10. At the same time, due to the piston action of the sealing plate 18, the water in the water storage tank 22 flows downward along the inner side of the delivery hole. When the telescopic rod 17 drives the water-absorbing cotton 19 to contact the inner side of the top wall of the collecting column groove 10, the water in the water storage tank 22 completely flows into the top of the homogenizing disk 161 through the water delivery hole 25.

[0047] The telescopic rod 17 continues to drive the sealing plate 18 to press the water-absorbing cotton 19 upward, so that the groundwater in the water-absorbing cotton 19 is squeezed by the sealing plate 18 and flows into the inner side of the collection shell 4 through the oblique flow hole 3. The heavy metal content in the water is detected by the detection probe 6, and the detection results are transmitted to the central processing equipment through the signal transmitter 5;

[0048] After the test is completed, the solenoid valve 8 is opened, allowing the tested groundwater to flow out through the outlet pipe 7, and the telescopic rod 17 is started to drive the water-absorbing cotton 19 to move downward. During the downward movement, the driving rod 162 is used to drive the homogenizing disk 161 to rotate again, so that the homogenizing disk 161 stirs the clean water on the top for cleaning. The fluid shear force and vortex effect generated by the homogenizing disk 161 make the clean water form a high-speed turbulent state, effectively stripping off the adsorbed heavy metal particles and colloidal substances remaining in the sampling area. When the water-absorbing cotton 19 moves to the bottom of the collection column tank 10 again, the clean water is extracted and the telescopic rod 17 is started again. The water-absorbing cotton 19 is driven to move to the inner side of the top wall of the collecting column groove 10 for squeezing, so that clean water is squeezed out of the water-absorbing cotton 19, and the clean water is cleaned through the oblique flow hole 3, the inner side of the collecting shell 4 and the surface of the detection probe 6, and finally flows out through the outlet pipe 7 to complete the cleaning. Water can be added to the water storage tank multiple times through the water inlet valve 24, and multiple cleanings can be completed in conjunction with the multiple telescopic actions of the telescopic rod 17. Finally, the telescopic rod 17 is reset, the solenoid valve 1 8 and the solenoid valve 2 26 are closed, and the detection is completed. Whenever the groundwater infiltrated into the collecting column groove 10 reaches a certain level, sampling and detection can be carried out to achieve monitoring.

[0049] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soil heavy metal monitoring device, comprising a positioning plate (1), characterized in that: A fixing column (2) is fixedly installed on the top of the positioning plate (1), a collecting shell (4) is fixedly installed on one side of the fixing column (2), a water tank (22) is fixedly installed on the other side of the fixing column (2), a detection probe (6) is installed through the interior of the collecting shell (4), a sampling rod (9) is fixedly installed on the bottom of the positioning plate (1), a collecting column groove (10) is opened inside the sampling rod (9), and the collecting column groove (10) is communicated with the collecting shell (4), a stirring assembly (16) is rotatably installed on the bottom of the collecting column groove (10) through a bearing, and the stirring assembly (16) includes a homogenizing disk (161), a sealing plate (18) that slides up and down is provided on the inner side of the collecting column groove (10), a water-absorbing cotton (19) is fixedly installed on the top of the sealing plate (18), and the sealing plate (18) and the water-absorbing cotton (19) move up and down to complete sampling and cleaning work; The stirring assembly (16) is configured to homogenize the sample liquid through the homogenizing disk (161) when the telescopic rod (17) drives the water-absorbing cotton (19) to take samples, and can stir the clean water after sampling to perform comprehensive cleaning.

2. The soil heavy metal monitoring device according to claim 1, characterized in that: An oblique flow hole (3) is provided through the interior of the fixed column (2), and both ends of the oblique flow hole (3) are respectively communicated with the inner side of the collecting shell (4) and the collecting column groove (10), and the end of the oblique flow hole (3) communicating with the collecting column groove (10) is higher than the other end.

3. The soil heavy metal monitoring device according to claim 2, characterized in that: A signal transmitter (5) is fixedly installed on one side of the collection shell (4), and the signal transmitter (5) is fixedly connected to the detection probe (6). A water outlet pipe (7) is installed through the bottom of the collection shell (4), and a solenoid valve (8) is fixedly installed on the outside of the water outlet pipe (7).

4. The soil heavy metal monitoring device according to claim 1, characterized in that: The sampling rod (9) has an annular groove (11) formed inside, and the annular groove (11) is close to the bottom of the sampling rod (9). The surface of the sampling rod (9) is provided with a plurality of leakage holes (12) arranged in a circular row and extending through the surface. A filter screen (13) is fixedly installed inside the leakage hole (12). The leakage hole (12) is communicated with the annular groove (11), and the bottom of the leakage hole (12) is higher than the inner side of the bottom wall of the annular groove (11).

5. The soil heavy metal monitoring device according to claim 4, characterized in that: The interior of the sampling rod (9) is provided with a plurality of through holes (14) arranged in a circular array, and the two ends of the through holes (14) are respectively communicated with the inner sides of the annular groove (11) and the collecting column groove (10), and the bottom of the annular groove (11) is provided with a plurality of reflow channels (15), and the positions of the reflow channels (15) and the through holes (14) correspond one to one.

6. The soil heavy metal monitoring device according to claim 1, characterized in that: The homogenizing disk (161) is rotatably mounted on the inner side of the bottom wall of the collecting column slot (10) via a bearing. A driving rod (162) is fixedly mounted on the top of the homogenizing disk (161). Two spiral guide grooves (163) are provided on the outer side of the driving rod (162). A plurality of receiving grooves (164) are provided on the top of the homogenizing disk (161) in a circumferential array. An elastic thin tube (165) is fixedly mounted on the inner side of the bottom wall of the receiving groove (164).

7. The soil heavy metal monitoring device according to claim 6, characterized in that: A telescopic rod (17) is fixedly mounted on the top of the fixed column (2), and a sealing plate (18) is fixedly connected to the output end of the telescopic rod (17). A movable column groove (20) is provided inside the telescopic rod (17) and the sealing plate (18), and the movable column groove (20) is located outside the driving rod (162). Two symmetrical guide rods (21) are fixedly mounted on the inner wall of the movable column groove (20), and the two guide rods (21) are respectively located inside the two spiral guide grooves (163).

8. The soil heavy metal monitoring device according to claim 4, characterized in that: A balancing pipe (23) is installed through the top of the water storage tank (22), and a water inlet valve (24) is installed through one side of the water storage tank (22).

9. The soil heavy metal monitoring device according to claim 8, characterized in that: A water delivery hole (25) is provided through the interior of the sampling rod (9), one end of the water delivery hole (25) is communicated with the inner side of the water storage tank (22), and the other end is communicated with the inner side of the annular groove (11). A second solenoid valve (26) is fixedly installed on the end of the water delivery hole (25) that is communicated with the water storage tank (22).

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