Multi-scene application water body multi-point layering synchronous sampling system and method

Abstract

The invention relates to the technical field of multi-point layered synchronous sampling, and discloses a multi-scene-applied water multi-point layered synchronous sampling system and method, the system comprises a modular sampling unit, a power transmission unit and a sampling control unit, the modular sampling unit can perform river and lake physical model sampling and river and lake near-shore sampling; when the river and lake physical model is used for sampling, water samples are collected according to physical parameters in rivers and lakes on the basis of the parameters. During near-shore sampling of rivers and lakes, representative water samples can be effectively collected through accurate point distribution and multi-point sampling. The power transmission unit comprises a pump body and is responsible for driving the water sample to be conveyed to the collection and storage device from the sampling point. The automatic collecting unit adopts a crawler-type bottle replacing mechanism, and the system can automatically replace a water sample collecting bottle.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of multi-point layered synchronous sampling, in particular to a water multi-point layered synchronous sampling system and method for multi-scene application. BACKGROUND

[0002] Water quality monitoring is crucial in the fields of environmental science, water conservancy engineering, etc., especially in the simulation of river and lake physical models and the tracking of pollution in the nearshore zone of natural water areas, high-temporal and high-spatial resolution water quality data are required. However, the existing sampling technology has the following core defects: the traditional sampling device is mostly of a single specification, which cannot adapt to the complex environment of "small scale and multiple flow directions" in the physical model. For example, in a wind-driven flow physical model of a certain lake (140m x 140m, horizontal scale 1:500), the water flow direction is disorderly and the flow velocity changes dramatically, and the existing device cannot be arranged in multiple points, which often leads to distorted sampling data due to fixed layout. The physical model test requires high-frequency sampling, but the flow range of the traditional peristaltic pump is limited (usually <100mL / min), and when the pump body and the sampler are arranged separately, transmission delay often occurs, resulting in missing data within the sampling period. The existing device has few layered sampling holes, and the hole diameter is not reasonably designed, which cannot capture the water quality differences in different water layers in the physical model, especially the pollutants released by the bottom sediments. The flow velocity in the nearshore zone is high (up to 2m / s) and the sediment content is large, and the traditional sampling device lacks effective fixing structure and is easily displaced by water flow, resulting in deviation of the sampling point; at the same time, the bottom sampling hole is often blocked by sediments, and the bottom water sample cannot be obtained.

[0003] Therefore, it is necessary to solve the problems of distorted sampling data and the inability of the existing sampling device to switch the sampling unit specification according to the scene. SUMMARY

[0004] The present application provides a water multi-point layered synchronous sampling system and method for multi-scene application to solve the problem of low selectivity of the existing sampling device in switching the sampling unit specification according to the scene.

[0005] The water multi-point layered synchronous sampling system and method for multi-scene application provided by the present application adopt the following technical solutions: In a first aspect, a water multi-point layered synchronous sampling system for multi-scene application is provided, which includes a modular sampling unit configured according to the sampling parameters and layout mode of the application scene, the input end of which is connected to a power transmission unit, and the transmission parameters of the power transmission unit are set based on the sampling parameters and layout mode; a sampling control unit is correspondingly arranged at the output end of the power transmission unit; the sampling control unit is configured to control the sampling rhythm according to the requirements, and an automatic collection unit is arranged at the output end of the sampling control unit, which is configured to operate the sampling bottle according to the requirements.

[0006] Preferably, the application scenarios at least include: application scenario one river and lake physical model sampling and application scenario two river and lake nearshore sampling.

[0007] Preferably, in application scenario one, when the river and lake physical model sampling is carried out, the modular sampling unit is provided with at least three collecting devices, the collecting devices are fixed through the truss, and the collecting devices are fixed in the water body through the truss.

[0008] Preferably, in application scenario two, when the river and lake nearshore sampling is carried out, the modular collecting unit is provided with at least one collecting device, the collecting device is provided with a round hoop outside, and a plurality of sampling holes are formed in the collecting device.

[0009] Preferably, the power transmission unit at least includes: a pump body for water sample delivery; a plurality of channels are arranged in the pump body, and water samples of multiple points are delivered at the same time, and a single channel of the pump body is controllable.

[0010] Preferably, the sampling control unit at least includes: a remote control valve and a positioning module, the remote control valve realizes positioning or trigger sampling through a control system, the sampling control unit realizes a time difference A of multi-point sampling, a volume deviation B of each layer sampling, and sends a sampling instruction from a node architecture synchronously through the control system.

[0011] Preferably, the automatic collection unit at least includes: a track type bottle changing mechanism for delivering sampling bottles, the track type bottle changing mechanism is delivered through a conveying belt, the conveying belt is provided with at least two conveying belts for conveying stored sample sampling bottles and empty bottles respectively; a filling structure connected with the output end of the power transmission unit for water sample bottling, and the empty bottle is filled after moving to the filling structure.

[0012] In a second aspect, a sampling method of a water body multi-point layered synchronous sampling system for multiple scene applications is provided, which is suitable for river and lake physical model sampling, and includes the following steps: S1, the modular sampling unit is installed, the sampling units are dispersedly arranged along the physical model truss, the positioning module is integrated at the top of each group of sampling units, the truss bolt is fixed, the pump body and the sampling device are integrally integrated, and the conveying pipeline is overhead laid along the truss; S2, the sampling control unit sends a sampling instruction according to a predetermined period, the pump body is opened, and the water sample is extracted; S3, the water sample is conveyed to the automatic collection unit through the pipeline.

[0013] In a third aspect, a sampling method of a water body multi-point layered synchronous sampling system for multiple scene applications is provided, which is suitable for river and lake nearshore sampling, and includes the following steps: S1, modular sampling unit installation, the modular sampling unit is arranged along the water flow direction; the pump body and the automatic collection are arranged on the bank; S2, triggering and execution, starting the pump body according to the preset time, and the sampling device extracts water samples; S3, the water sample is transported to the automatic collection unit on the bank through the pipeline.

[0014] In summary, the present application has the following beneficial technical effects: Through the trinity design of "scene adaptation-synchronous control-automation", the technical bottleneck of traditional water quality sampling in "multi-scene adaptability, synchronous precision and layered integrity" is solved, which is especially suitable for river and lake physical model simulation and nearshore pollution source tracking, and provides a high-reliability sampling tool for water environment research. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is the structural schematic diagram of the river and lake physical model sampling unit of the present application embodiment 1.

[0016] Figure 2 is the structural schematic diagram of the river and lake nearshore sampling unit of the present application embodiment 1.

[0017] Figure 3 is the truss arrangement structure schematic diagram of the present application embodiment 2.

[0018] Figure 4 is the structural schematic diagram of the river and lake physical model sampling unit of the present application embodiment 2.

[0019] Figure 5 is the structural schematic diagram of the automatic collection unit of the present application.

[0020] Figure 6 is the actual experiment schematic diagram of the present application embodiment 3.

[0021] Figure 7 is the experimental installation schematic diagram of the present application embodiment 3.

[0022] Figure 8 is the sampling pipeline structure schematic diagram of the present application embodiment 3.

[0023] Figure 9 is the structural schematic diagram of the sampling device in the river and lake physical model sampling unit of the present application embodiment 1.

[0024] Explanation of reference numerals: fixed pile 1, collection device 2, pump body 3, positioning module 4, water inlet 5, pipeline 6, control system 7, sampling bottle 8, reverse flow port 9, crawler type bottle changing mechanism 11, bottle changing mechanical arm 12, pipeline sample conveying rack 13, sample metering flow guide pipe 14, liquid level sensor 15, collection box 16, collection body 21, sampling connecting pipe 22, water outlet 23. DETAILED DESCRIPTION

[0025] The following description will be made in conjunction with the accompanying drawings Figures 1-9 Further detailed description of the present application, in the prior art, a lake physical model size is 140m x 140m, the maximum water depth is about 0.6m, the horizontal scale is 1:500, the vertical scale is 1:10, the water power measurement and control system has been set up, and the flow field observation ability of the whole lake area is provided. However, the scale effect caused by the model reduction makes the diffusion rate of pollutants in the model significantly higher than that of the prototype lake, and the traditional monitoring means is difficult to realize effective tracking and observation of the dynamic migration process of pollutants.

[0026] The present application proposes a multi-point, layered synchronous sampling method, which realizes synchronous sampling of different spatial points and different water depths of the whole lake area of the lake physical model, and combines traditional water quality monitoring and new eDNA monitoring methods to obtain high spatiotemporal resolution data of water quality indicators and biological factors, reflect the pollutant migration path and biological response mechanism, and trace the water flow movement law, thereby improving the application value of the lake physical model in the fields of water environment, water ecology and water power.

[0027] Embodiment 1 The embodiment of the present application discloses a water body multi-point layered synchronous sampling system and method for multiple scene applications. Referring to Figures 1 to 4 As shown, it comprises a modular sampling unit, a power transmission unit and a sampling control unit. The modular sampling unit can be used for river and lake physical model sampling and river and lake nearshore sampling. During river and lake physical model sampling, water samples are collected based on the physical parameters (flow velocity, water depth) in rivers and lakes. During river and lake nearshore sampling, accurate point distribution and multi-point sampling can effectively collect representative water samples. The power transmission unit comprises a pump body 3, which is responsible for driving water samples from the sampling point to the collection and storage device. The automatic collection unit adopts a track-type bottle changing mechanism 11, and the system can automatically replace the water sample collection bottle. During each sampling, the system automatically takes out the empty bottle and fills in the new collection bottle, ensuring that the sample is not contaminated and ensuring the continuity of the sampling process. During the sampling process, the system dynamically adjusts the layout of the sampling unit according to the characteristics of the water flow, the flow rate and the water depth, etc. When the water flow changes greatly or the environmental factors change, the system can automatically optimize the sampling position and the sampling method, thereby improving the accuracy and representativeness of the data.

[0028] In the above embodiments, the application scenarios include: river and lake physical model sampling and river and lake nearshore sampling; the river and lake physical model sampling mainly refers to sample collection and data analysis using the physical model of the river and lake. The sampling process involves monitoring various physical properties of the water body (such as flow rate, water temperature, salinity, turbidity, etc.) to support model calibration and verification; the river and lake nearshore sampling is to collect samples in the water body, wetland and aquatic plant area near the shore. The water quality, sediments, ecological status, etc. in this area may be significantly different from those far from the shore, so special sampling work is needed. Collecting environmental data in the nearshore area of the river and lake is used to study water quality changes, ecological restoration, pollution source tracking, etc. It is of great significance in water body eutrophication, ecological protection, etc.

[0029] The power delivery unit includes a pump body 3 and a pipeline 6. The pump body 3 is the core component of the power delivery unit, and its main function is to deliver water samples. According to the application scenario, the pump body 3 needs to be designed to efficiently and stably deliver water samples from the sampling point to the analysis equipment or other processing devices. The pump body 3 is internally provided with multiple channels, which can simultaneously deliver water samples from multiple points. Water samples can be collected from different water sampling points (different depths or different locations of the river) at the same time, greatly improving the sampling efficiency and avoiding the use of multiple pump bodies 3 and complex operation processes. Each channel is individually controllable, which provides higher flexibility for experiments and analysis. In some application scenarios, it may be necessary to control the water sample delivery rate of different sampling points or adjust the sampling requirements of different points at different time periods. The controllable channel design enables more precise control and scheduling, and the collected water samples are delivered through the pipeline 6.

[0030] The sampling control unit includes a remote control valve and a positioning module 4. The remote control valve precisely controls the collection of water samples during sampling. Through the control system 7, the remote control valve operates according to the requirements to ensure that water samples are collected only at specific times or locations. The positioning module 4 works with the remote control valve to ensure that sampling occurs at the predetermined sampling point location. The positioning module 4 determines the sampling location in real time through sensors and positioning modules 4 (GPS, pressure sensor), thereby accurately triggering the corresponding remote control valve. Through the combination of the remote control valve and the positioning module 4, the triggering mode of the sampling is set to positioning or triggering. Positioning sampling relies on the positioning module 4 to determine the sampling point and automatically triggers sampling when the specified sampling location is reached. Triggered sampling relies on the timing set by the control system 7, and the sampling valve is triggered at a specific time point.

[0031] In the above embodiments, further, the sampling control unit, the pump body 3 and the positioning module 4 are integrally arranged on the top of the positioning pile 1, located on the water surface, facilitating signal reception. The components are integrated on the top of the positioning pile 1, which can better avoid underwater interference factors and improve the stability and accuracy of signal reception.

[0032] In water quality monitoring and environmental sampling, it is necessary to conduct synchronous sampling at multiple locations or depths. In order to ensure the comparability and consistency of sampling data at each point, the time difference control (≤15s): through the sampling control unit, the sampling time of each sampling point is accurately coordinated, ensuring that the sampling operation starts at the same time, and minimizing the deviation of sampling data caused by time difference. Through the time synchronization mechanism (using GPS synchronization, network clock or special time synchronization protocol), the sampling time difference of each sampling point is controlled within 15 seconds. The control system 7 ensures the precise synchronization of the execution instructions of each sampling device through PLC, single-chip microcomputer or special time synchronization module. The control system 7 monitors the time difference of the sampling points in real time and automatically adjusts the sending time of the sampling instructions to ensure the synchronization of the sampling of each point. Different levels of sampling require accurate sampling volume to ensure the accuracy of the data. Large volume deviation will affect the representativeness of the sampling results, and then affect the accuracy of the analysis results. Through the control system 7, the sampling volume of each sampling point is monitored and adjusted in real time. The synchronization control unit can accurately control the opening and closing of the sampling device according to the preset sampling volume and sampling time, ensuring that the volume deviation of each layer does not exceed 5%. This control is achieved through feedback devices such as pressure sensors; when the sampling volume deviation is detected, the control system 7 can adjust the working parameters of the sampling device in time to correct the volume deviation.

[0033] During the sampling process, the opening time and flow rate will be adjusted according to the instructions of the control system 7 to ensure that the volume of each sampling point is controlled within the error range. The control system 7 adopts a distributed node architecture, and multiple sampling nodes are connected to the control system 7 through a network or a field bus. Each node is responsible for the sampling operation of its sampling point and receives sampling instructions from the control system 7. The control system 7 sends sampling instructions to all sampling nodes simultaneously to ensure that each node starts sampling at the same time. Each node executes the sampling operation according to the received instructions, thereby realizing the synchronous work of the entire system. Communication and instruction synchronization between nodes are realized through local network or real-time bus system (Ethernet / IP, Modbus), ensuring the immediate transmission and execution of instructions. Nodes maintain time sequence consistency through efficient synchronization protocols (time synchronization protocol NTP or GPS synchronization), ensuring that all nodes can start and end sampling operations within the specified time, avoiding data errors caused by time lag.

[0034] The control system 7 is the command center of the whole sampling system, responsible for coordinating the work of each node and ensuring the sending of synchronous instructions. The control system 7 will monitor the working state of each node in real time, perform sampling task scheduling and fault diagnosis. Each sampling point is equipped with an independent control unit (PLC or single-chip microcomputer) responsible for receiving and executing instructions from the main control system, while monitoring volume, time and other parameters during the sampling process. The control system 7 has real-time data acquisition and feedback function, which can adjust the sampling parameters according to the real-time data during the sampling process, to ensure that the time difference and volume deviation are within the set range.

[0035] As shown in Figure 5 The automatic collection unit includes a caterpillar bottle changing mechanism 11, a bottle changing mechanical arm 12, a pipeline sample conveying rack 13, a sample metering flow guide pipe 14, a liquid level sensor 15 and a collection box 16. The caterpillar bottle changing mechanism 11 is provided with two or three conveying belts. When two are provided, one is used to convey the sampling bottle 8 and the other is used to convey the empty bottle. When three are provided, two are used to convey the sampling bottle 8 and one is used to convey the empty bottle. The pipeline sample conveying rack 13 and the bottle changing mechanical arm 12 are covered outside the conveying belt. The bottle changing mechanical arm 12 is provided with two, located on both sides of the pipeline sample conveying rack 13. The bottle changing mechanical arm 12 respectively changes the position of the empty bottle and puts the sampling bottle 8 with sample into the collection box 16, which is convenient for unified arrangement. The pipeline sample conveying rack 13 fixes a plurality of sampling pipelines 6. The sample metering flow guide pipe 14 is connected with the sampling pipeline 6 to guide the liquid sample in the sampling pipeline 6 into the sampling bottle 8. The end of the pipeline 6 is provided with a backflow port 9. The filling position of the pipeline sample conveying rack 13 is provided with a liquid level sensor 15. The liquid level sensor 15 monitors whether the collection bottle is full. After it is full, the conveying belt continues to move to convey the empty bottle to the filling position.

[0036] In actual work process, the conveying belt sends the empty bottle to the pipeline sample conveying rack 13. When the liquid sample in the sampling pipeline 6 enters the sampling bottle 8 through the metering flow guide pipe, the liquid level sensor 15 monitors the inflow of the liquid to ensure the accuracy of sampling. The bottle changing mechanical arm 12 takes the full sampling bottle 8 from the conveying belt according to the signal of the liquid level sensor 15 and puts it into the collection box 16. The conveying belt continues to run to send the empty bottle to the filling position for the next round of sampling. The whole process is repeated, and the conveying belt conveying the empty bottle can also perform the conveying action of the collection box 16.

[0037] As shown in Figure 4As shown, when the river and lake physical model sampling is carried out, in the 140m*140m physical model, the sampling units are arranged at the truss grid 5m*5m interval, each group of sampling devices is arranged in 3 layers along the truss height direction, the layer spacing is 20cm, the bottom layer collection device is 10cm away from the bottom of the model, so as to avoid the interference of sediment, the collection device 2 is provided with three, one side of the collection device 2 is provided with the water inlet 5, the collection device 2 is fixed in the lake through the fixing pile 1, the three collection devices 2 are arranged at different water depth positions, the water samples of different levels of water body can be obtained in one sampling period, and the water quality change of the water body can be more comprehensively analyzed. This hierarchical sampling method effectively avoids the error and incompleteness caused by single level sampling; the hierarchical sampling method effectively avoids the error and incompleteness caused by single level sampling. The collection device 2 of each layer can flexibly adjust the sampling position according to the water depth change, and adapt to the needs of different water areas. Only the sampling accuracy is improved, but also representative water quality data can be obtained in a large range, the pump body 3 and the positioning module 4 are integrated on the top of the fixing pile 1, the pump body 3 is connected with the collection device 2 through the pipeline 6, and the pump body 3 sends the collected sample to the bottle body 8 through the pipeline 6.

[0038] In further embodiments, further, as Figure 9 As shown, the collection device 2 comprises: a collection body 21, a sampling connecting pipe 22, a water inlet 5 and a water outlet 23, the collection body 21 forms a cavity inside, the collection body 21 completely enters the water body, the sampling connecting pipe 22 is connected with the pump body 3, the water inlet 5 and the water outlet 23 are provided with electric valves, the collection body 21 is provided with three, the three collection bodies 21 are connected with the fixing pile 1, and the three collection bodies 21 are arranged at different depths. The flow direction of the water inlet 5 and the water outlet 23 is consistent with the flow direction of the water flow, when taking water, the electric valve controls to open the water inlet 5 and close the water outlet 23, during the sampling process, the electric valve closes the water inlet 5 and the water outlet 23, after the water sample collection is completed, the electric valve controls the water inlet 5 and the water outlet 23 to open, at this time, due to the flow of the water flow, the water sample in the collection body 21 naturally flows out and enters the new water sample.

[0039] When sampling in the nearshore area of rivers and lakes, the collection device 2 is set as a cylinder, and at least 5 layers of sampling holes 12 are opened on the side wall of the cylinder. Each layer of sampling holes 12 corresponds to the sampling requirements of different water depths and water quality levels, which can fully capture water samples of different depths and water quality in the nearshore area, and ensure that the collected data reflects the water quality difference in the water area, especially in the area affected by pollution sources. From the water surface to the water bottom, the error caused by water layer changes or different water flow speeds is reduced, and the changing water quality is adapted. Other components (pump body 3, sampling control unit) cooperating with the collection device 2 are fixed on the shore rather than directly immersed in water. This makes the equipment easier to maintain, clean and manage, and also avoids the wear and tear of the equipment caused by long-term underwater work. The pipeline 6 is pre-buried underwater.

[0040] In the above embodiment, further, the sampling hole 12 on the side wall of the cylinder has a hole diameter of 8-inch pipe (about 26 mm). This hole size helps to effectively collect water samples while avoiding sample contamination or loss caused by water flow impact. The hole diameter of the 8-inch pipe is large enough to ensure that the water flow is not too resistant when passing through the hole, thereby ensuring the smoothness of water sample collection. In order to more comprehensively collect water samples, the bottom of the cylinder is additionally provided with a sampling hole 12. The water sample in the bottom layer of water body is collected, and the pollutants or sediments that may accumulate at the bottom of the lake or river. Ensure that the water quality information of the bottom layer of water body is not missed, and make up for the deficiency of the traditional collection device 2 which only collects surface water quality data. The bottom sampling hole 12 transports the sample to the water surface through the pre-buried pipeline 6.

[0041] In the above embodiment, further, the cylinder is made of transparent acrylic or opaque engineering plastic. The transparent acrylic has good corrosion resistance and optical transparency, which allows the operator to clearly observe the internal conditions of the sampling unit during installation and maintenance. The transparent material also helps to monitor possible sediments or particles in the water body, making it easy to evaluate the situation during the sampling process. The opaque engineering plastic has strong ultraviolet resistance, chemical corrosion resistance and structural stability, which is suitable for maintaining stable performance during long-term use, especially in complex environments that can withstand corrosion by water pollutants.

[0042] In the above embodiment, further, a circular hoop is provided outside the cylinder. The main purpose of providing a circular hoop outside the cylinder is to enhance the structural stability of the equipment and ensure the fixation of the cylinder in the water layer. The circular hoop is a ring-shaped structure made of metal or other solid materials surrounding the cylinder, which can provide external support to avoid the cylinder from being displaced due to the impact or shaking of water flow. The circular hoop is connected to the fixed pile 1 by a cable, further enhancing the positioning and stability of the cylinder. Through the connection of the cable and the fixed pile 1, the sampling device can be firmly fixed at the specified position, avoiding displacement caused by water flow or wind force. The fixed pile 1 is arranged on the shore or the bottom of the water, ensuring that the sampling device can maintain a stable position during sampling.

[0043] The upper and lower portions of the cylinder are provided with circular hoops to ensure the overall stability of the sampling device. Not only can it help fix the position of the equipment, but it can also enhance the overall strength of the cylinder to prevent deformation of the equipment caused by water flow impact or wave impact. The design of the upper and lower circular hoops can help evenly distribute the force borne by the cylinder, avoiding excessive tension or pressure on a certain part. This makes the equipment more stable in environments with strong water flow or waves.

[0044] Embodiment 2 On the basis of embodiment 1, a water quality multi-point layered synchronous sampling method for river and lake physical models is proposed, including the following steps: S1, as shown in the figure, installation of the modular sampling unit: along the physical model truss, 10-20 cm in diameter and 40-60 cm in height, the modular sampling unit is arranged. Figure 3

[0045] As shown in the figure, the top of the modular sampling unit is integrated with a positioning module 4, which is fixed by truss bolts to ensure that the displacement is ≤10 cm when the water flow speed is 1.5 m / s. According to the model scale (140m×140m physical model), 10-20 cm modular sampling units are arranged on the truss structure, with a height of 40-60 cm, and at least 3 layers of collection devices 2 are arranged. The pump body 3 is integrated with the positioning module 4 and is fixed to the truss by bolts. The pump body 3 uses a peristaltic pump. Figure 4

[0046] The pipeline 6 is laid along the truss, with a pipe diameter of 10-20 mm and a length of ≤30 m. The synchronous control unit uses a PLC or single-chip microcomputer system, communicates with the electric valve through an RS485 interface (Modbus RTU protocol), and presets the sampling frequency to be 5 min / time. The GPS positioning module 4 synchronizes the time difference to be ≤15 s.

[0047] S2, layered synchronous sampling: the PLC sends sampling instructions at a 5 min cycle, and the electric valves of each unit are opened synchronously (opening degree 100%), and the peristaltic pump extracts water samples at a rate of 20-50 mL / min. The 3 layers of collection devices 2 are opened at the same time, with a sampling volume of 50 mL (DNA test) or 100 mL (physical and chemical test) per layer, and the volume deviation is monitored by a pressure sensor, with a deviation of ≤5%.

[0048] S3, the water sample is transported to the automatic collection unit through the pipeline 6, with a transmission time of ≤30 s. The track-type bottle changing mechanism 11 changes the collection bottle at a speed of 10 cm / s to ensure that the replacement time is ≤5 s. A 4℃ cold chain module or a 0.22μm membrane pretreatment module can be selected and connected to the water outlet through a quick connector. The quick connector meets the ISO7-1 standard thread and can withstand a pressure of ≥0.6MPa.

[0049] Embodiment 3 ​​On the basis of embodiment 1, a multi-point layered synchronous sampling method for river / lake nearshore water quality is proposed, including the following steps: S1, as shown in Figures 6 to 8 The modular sampling unit is installed: a cylindrical sampling device with a diameter of 1 m and a height of 3 m is arranged every 50-100 m along the direction of water flow, 5 layers of sampling holes 12 (hole diameter 26 mm) are opened in the side wall, and a sampling hole 12 is added at the bottom, and the material can be selected as opaque engineering plastic (light shielding test).

[0050] A stainless steel ring 14 (thickness ≥5 mm) is installed on the upper and lower parts of the cylinder, which is connected with the shore fixed pile 1 through the cable 15 (buried depth ≥1.5 m), to ensure that it is stable and does not move when the water flow speed is 2 m / s.

[0051] A pump body 3 is deployed on the shore, which can use a centrifugal pump connected with the sampling unit 10 through an underwater pre-buried pipeline 6 with a diameter of 50-80 mm, and the pipeline 6 is made of corrosion-resistant PVC with a buried depth of ≥1 m. The synchronous control unit adopts a distributed architecture, and the main controller synchronizes the clocks of each node through the GPS positioning module 4, supporting timed (10 min / time) or triggered sampling (automatic start when water level changes).

[0052] S2, triggering and execution: timing triggering, starting the centrifugal pump every 10 min according to the preset period, opening the electric valve, and simultaneously extracting water samples from the 5 layers of sampling holes 12, with a volume of 100-500 mL (physical and chemical test) per layer, and the pump speed is controlled at 0.5-1 m / s. Triggered sampling: when the flowmeter detects a sudden change in flow rate (±20%) or a manual remote command, the system will immediately start sampling, with a time difference of ≤15 s.

[0053] S3, the water sample is transported to the automatic collection unit through the underwater pipeline 6, and the track-type bottle changing mechanism 11 automatically receives the sample, with a bottle capacity of 1 L, and the bottle opening is sealed and connected with the water outlet. An automatic labeling module can be selected to record the sampling time, depth (converted by pressure sensor) and GPS positioning module 4 coordinates in real time.

[0054] S4, the main control system collects node data including sampling time, water depth, flow rate, and volume through Modbus protocol, generates sampling data log and stores it.

[0055] The differences between embodiment 2 and embodiment 3 are as follows: Embodiment 4 On the basis of embodiment 3, as Figure 6As shown, in actual use, the inlet position of the algae control well is selected as the control group, and the position 500m downstream of the outlet of the algae control well is selected as the test river section. Due to the effect of the guide ridge, the water in this area is mixed evenly with the compressed cyanobacteria, and there is no influence of external conditions such as tributary inflow. The specific test is carried out in the right half of the river section, and the left half is used as the normal driving area of the cleaning ship.

[0056] After the algae control well is operated stably, a slightly higher open-ended cylinder than the water depth is quickly installed in the designated area of the river, so that the mixed and evenly compressed algae water is fixed in the cylinder, and the settlement and recovery of the compressed algae under the same water temperature and light conditions as the river water are measured. In order to ensure that the light conditions caused by different water depths are different, three transparent cylinders are installed in the middle of the line, the shore, and the middle of the line and the shore to test. In order to further verify the recovery status of the compressed algae under different conditions, an opaque pipe is installed near each transparent pipe to test the recovery status under no light conditions. As shown in Figure 7 As shown, A, B, and C are transparent cylinders, and D, E, and F are opaque cylinders. The opaque cylinders need to be covered to prevent light from entering the cylinder from the top.

[0057] As shown in Figure 8 The diameter of the cylinder is 80cm, the height of C, F, and G pipes is about 4m, the height of B and E pipes is about 3m, and the height of A and D pipes is about 2m. The C pipe is used as a settling pipe, and holes are opened every 30cm on the side wall, with a hole diameter of 8mm, a total of 7 holes, and a hole 30cm from the bottom. Each hole is connected to a water pipe to the water surface; the remaining pipes have two holes in the middle and bottom layers; the opaque pipes need to be covered to ensure a dark environment; a circular hoop is installed on the upper and lower parts of the cylinder, and the cylinder is fixed in the river channel by using a cable and the circular hoop; the cylinder is easy to assemble and disassemble, and can be reused in different water depth areas.

[0058] The modular sampling unit includes a corresponding sampling parameter and layout mode setting module according to the application scenario, the input end of the modular sampling unit is connected to the power transmission unit, and the transmission parameter of the power transmission unit is set based on the sampling parameter and the layout mode; the sampling control unit is correspondingly arranged at the output end of the power transmission unit; the sampling control unit is arranged to control the sampling rhythm according to the requirements.

[0059] Finally, it should be pointed out that: first of all, in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "installation", "connection", "connection" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change; Secondly: the drawings in the embodiment of the present application only involve the structure related to the embodiment of the present application, other structures can refer to the general design, and in the case of no conflict, the same embodiment and different embodiments of the present application can be combined with each other; Finally: the above only for the preferred embodiment of the present application, and not for limiting the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

[0060] The above are the preferred embodiments of the present application, but not limit the protection scope of the present application, therefore: any equivalent change made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A multi-scene application water body multi-point layered synchronous sampling system, characterized in that, The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit.

2. The multi-scene applied water body multi-point layered synchronous sampling system according to claim 1, characterized in that, The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit.

3. The multi-scene applied water body multi-point layered synchronous sampling system according to claim 2, characterized in that, The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit.

4. The multi-scene applied water body multi-point layered synchronous sampling system according to claim 2, characterized in that, The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit.

5. The multi-scene applied water body multi-point layered synchronous sampling system according to claim 1, characterized in that, The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit.

6. The multi-scene applied water body multi-point layered synchronous sampling system according to claim 1, characterized in that, The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit.

7. The multi-scene applied water body multi-point layered synchronous sampling system according to claim 1, characterized in that, The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit.

8. The sampling method of the multi-scene applied water body multi-point layered synchronous sampling system according to any one of claims 1-7, characterized in that, The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit.

9. The sampling method of the multi-scene applied water body multi-point layered synchronous sampling system according to any one of claims 1-7, characterized in that, The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit, a power transmission unit, a sampling control unit and an automatic collection unit. The application relates to a modular sampling unit

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