High-fall underground water sampling device and use method thereof

Abstract

The invention relates to the technical field of underground water sampling, in particular to a high-fall underground water sampling device and a use method thereof. The rack comprises a top plate which is provided with a sliding rail. The winding module is arranged on the rack and comprises a sliding block, a winding assembly and a guide rope, and the sliding block is arranged on a sliding rail to do linear reciprocating motion; the winding assembly is fixed to the sliding block. The guide rope is arranged on the winding assembly, and the winding assembly controls winding and unwinding of the guide rope. The guide rope penetrates through the top plate; the sampling module comprises a shell connected with the guide rope and a sampling cabin arranged in the shell; a valve is arranged on the shell corresponding to the sampling cabin; the detection module comprises a depth sensor and a pressure sensor; the detection module is mounted on the shell to detect depth and pressure; the control system is used for controlling movement of the winding module and controlling opening and closing of the valve. According to the invention, data errors are effectively reduced by sampling different depths for multiple times and checking the depths.

Description

Technical Field

[0001] The invention relates to the technical field of groundwater sampling, and in particular to a high-drop groundwater sampling device and a use method thereof. Background Art

[0002] High-drop groundwater sampling refers to sampling water bodies at different depths in a deep groundwater environment with the help of professional equipment to obtain information on the physical, chemical and biological characteristics of groundwater. As one of the important water resources on the earth, groundwater is widely used in agricultural irrigation, industrial production and drinking water supply. Monitoring its quality and distribution has important scientific and practical significance.

[0003] Existing groundwater sampling technologies mainly include manual rope samplers, pump-suction sampling devices and simple automated sampling systems; however, under high-drop conditions such as deep wells or complex geological environments, due to the large sampling depth and obvious pressure changes, there are technical difficulties caused by the high drop, such as equipment stability and data accuracy; and traditional devices lack accurate depth sensing and feedback control functions. Some devices can only collect water samples at one depth at a time, making it difficult to achieve continuous sampling of groundwater at different depths, resulting in large errors in the sampling data.

[0004] Therefore, there is an urgent need for a high-drop groundwater sampling device and a method of using the same to solve the above-mentioned deficiencies. Summary of the invention

[0005] In view of at least one of the above technical problems, the present invention provides a high-drop groundwater sampling device and a method of using the same, which effectively improves data accuracy and reduces sampling data errors by continuously sampling groundwater at different depths and calibrating the sampling depth.

[0006] In order to achieve the above object, the present invention provides a high-drop groundwater sampling device, comprising: The frame is arranged on the ground; the frame comprises a top plate, and a slide rail is arranged horizontally on the upper surface of the top plate; The winding module is arranged on the frame, and includes a slider, a winding assembly and a guide rope. The slider is arranged on the slide rail and performs linear reciprocating motion. The winding assembly is fixed on the slider. The guide rope is arranged on the winding assembly, and the winding assembly controls the winding and unwinding of the guide rope. The guide rope passes through the top plate. The sampling module comprises a housing connected to the guide rope and a sampling cabin arranged inside the housing; a valve is arranged at a position of the housing corresponding to the sampling cabin; The detection module includes a depth sensor and a pressure sensor; the detection module is installed on the housing and is used to detect the depth and pressure of the underwater position where the sampling module is located; The control system is used to control the movement of the winding module and the opening and closing of the valve.

[0007] Furthermore, the winding assembly includes a reel, a fixed seat and a transmission shaft; the fixed seats are arranged at both ends of the slide rail, and both ends of the transmission shaft are rotatably mounted on the two fixed seats respectively; the reel passes horizontally through the slider, the reel is sleeved on the transmission shaft and rotates synchronously with the transmission shaft, and the reel can move synchronously with the slider; the guide rope is wound around the reel.

[0008] Furthermore, it comprises a driving module, which is used to drive the rotation of the reel to drive the unwinding of the guide rope; the driving module also drives the sliding block to slide on the slide rail.

[0009] Furthermore, the rack also includes support feet, which are arranged at the bottom of the rack; the support feet are used to adjust the height and inclination of the rack.

[0010] Furthermore, a through hole is provided on the top plate, and the frame further comprises a guide tube, which is fixedly connected to the top plate and is coaxial with the through hole; the guide rope passes through the through hole and the guide tube.

[0011] Furthermore, a partition plate is arranged between each sampling chamber; a slot is arranged on the inner wall of the shell opposite to the valve, and a sampling door is arranged on the side wall of the shell corresponding to the sampling chamber; the sampling chamber is provided with an open end, and the open end faces the valve; a positioning block is arranged on the outer wall of one end of the sampling chamber opposite to the open end, and the positioning block slides in the slot.

[0012] Furthermore, the shell is provided with sealing rings at the positions of the sampling door and the valve.

[0013] The present invention also provides a method for using a high-drop groundwater sampling device, comprising the following steps: S10: placing the rack at the target groundwater sampling point, inserting multiple sampling capsules into the card slots through the positioning blocks until the sampling capsules enter the shell, closing the sampling door, and connecting the shell to the guide rope; setting the target depth D0 and the depth error δd; S20: The control system controls the winding assembly to slide on the slide rail, and at the same time, the transmission shaft drives the reel to rotate, driving the sampling module to descend into the water body; S30: The depth sensor detects the depth D1 from the location of the sampling module to the water surface in real time, and the pressure sensor detects the water pressure P at the location of the sampling module in real time; S40: Calculate △D=|D1-D0|; when △D≤δd, a valve is opened, and the sampling chamber corresponding to this valve is sampled, and the valve is closed after the sampling is completed; S50: Continue to descend, and repeat steps S30 and S40 until sampling of all sampling chambers is completed; S60: The winding component drives the sampling module to rise and leave the water body, and the staff removes the sampling module to complete the sampling.

[0014] Furthermore, in step S30, the depth D1 is also verified: Record the pressure p1, p2 and the distance db1, db2 from the water surface at two sampling modules at different depths; calculate D2=P2×(db2-db1) / (p2-p1); Wherein, P2 is the pressure detected at D2; Construct D3 = V × (t-t1), V = 2 × π × R × n; Among them, V is the unwinding speed of the guide rope, t is the working time, t1 is the time from the start of work to the first change of the pressure sensor, R is the drum radius, and n is the drum speed; Finally, when the difference between D2 and D1 and the difference between D3 and D1 are less than the artificially set threshold, D1 is the correct depth.

[0015] Furthermore, during the sampling process, basic water quality information of the water samples taken is recorded and associated with the corresponding sampling chamber to form a preliminary data report.

[0016] The beneficial effects of the present invention are as follows: the present invention winds up the guide rope by sliding and rotating the winding component on the slide rail, thereby achieving the effect of stabilizing the guide rope so that it will not shake too much; the sampling module is designed with multiple independent sampling cabins, and in one sampling work, groundwater at different depths can be continuously sampled, and the accuracy of the sampling depth can be improved by calibrating the sampling depth, thereby improving data accuracy and reducing errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structure of the high-fall groundwater sampling device of the present invention; Figure 2 It is a top view of the high-fall groundwater sampling device of the present invention; Figure 3 It is a structural schematic diagram of a sampling module in a high-drop groundwater sampling device of the present invention; Figure 4 It is a cross-sectional schematic diagram of a sampling module in the high-fall groundwater sampling device of the present invention; Figure 5 It is a structural schematic diagram of a sampling cabin in a high-drop groundwater sampling device of the present invention; Figure 6 A schematic diagram of the steps of the method for using the high-drop groundwater sampling device of the present invention; Figure numerals: 1. frame; 11. top plate; 11a. through hole; 12. slide rail; 13. support foot; 14. guide tube; 2. winding module; 21. slider; 22. winding assembly; 22a. reel; 22b. transmission shaft; 22c. fixed seat; 23. guide rope; 3. sampling module; 31. shell; 31a. valve; 31b. slot; 31c. sampling door; 31d. sealing ring; 32. sampling chamber; 32a. positioning block; 32b. opening end; 33. partition plate; 4. detection module; 41. depth sensor; 42. pressure sensor; 5. control system; 6. drive module. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0020] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside”, etc., are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] A high drop groundwater sampling device, such as Figures 1 to 5 As shown, including: The frame 1 is arranged on the ground; the frame 1 comprises a top plate 11, and a slide rail 12 is horizontally arranged on the upper end surface of the top plate 11; The winding module 2 is arranged on the frame 1, and includes a slider 21, a winding assembly 22 and a guide rope 23. The slider 21 is arranged on the slide rail 12 and performs linear reciprocating motion; the winding assembly 22 is fixed on the slider 21; the guide rope 23 is arranged on the winding assembly 22, and the winding assembly 22 controls the winding and unwinding of the guide rope 23; the guide rope 23 passes through the top plate 11; The slider 21 drives the winding assembly 22 to move on the slide rail 12, and the winding assembly 22 drives the guide rope 23 to move up and down, so that when the guide rope 23 rises or falls, the winding assembly 22 moves on the slide rail 12 accordingly, so that the position where the guide rope 23 passes through the top plate 11 remains unchanged and is always on the same vertical straight line, thereby reducing the swing of the guide rope 23 during the movement process and improving the stability of the equipment; The sampling module 3 includes a housing 31 connected to the guide rope 23 and a sampling chamber 32; the sampling chamber 32 is fixedly arranged inside the housing 31; a valve 31a is arranged at a position of the housing 31 corresponding to the sampling chamber 32, and the valve 31a can be a solenoid valve, which is a prior art and will not be described in detail here; when the water reaches a certain depth, the valve 31a opens, and water automatically flows into the sampling chamber 32 to complete the sampling, and then the valve 31a is closed, and the sampling chamber 32 forms a closed space to prevent the water sample collected at this depth from being contaminated; The detection module 4 includes a depth sensor 41 and a pressure sensor 42; the detection module 4 is installed on the housing 31, and is used to detect the depth and pressure of the underwater position of the sampling module 3; the depth sensor 41 can use ultrasonic sensors, laser sensors and other sensors to measure the depth from the underwater position of the sampling module 3 to the water surface; and when the detection module 4 is installed at the upper end or the lower end of the housing 31, it only needs to make corresponding compensation. If the installation range of the detection module 4 on the housing 31 is not much different from the depth, the influence of the installation position can also be ignored; The control system 5 is used to control the movement of the winding module 2 and the opening and closing of the valve 31a.

[0023] like Figure 2 As shown, the winding assembly 22 includes a reel 22a, a fixed seat 22c and a transmission shaft 22b; the fixed seat 22c is arranged at both ends of the slide rail 12, and the transmission shaft 22b horizontally passes through the slider 21. Preferably, the slider 21 is designed to be one at each end of the transmission shaft 22b, and the two ends of the transmission shaft 22b are respectively rotatably mounted on two fixed seats 22c to support the transmission shaft 22b, and the reel 22a is sleeved on the transmission shaft 22b through a key connection and other structures to achieve synchronous rotation with the transmission shaft 22b, and the reel 22a can move synchronously with the slider 21; the guide rope 23 is wound around the reel 22a, and when the transmission shaft 22b drives the reel 22a to rotate, the guide rope 23 will also be rolled up or released accordingly.

[0024] It includes a driving module, which has two power sources, one for driving the rotation of the reel 22a to drive the unwinding of the guide rope 23; the other power source of the driving module is used to drive the sliding block 21 to slide on the slide rail 12; the reel 22a and the sliding block 21 can be driven by a motor or other power source, so that the movement of the entire winding module 2 is more precise and stable.

[0025] The frame 1 also includes a support foot 13, which is arranged at the bottom of the frame 1 and can adopt a threaded adjuster; the support foot 13 can adjust the height of the frame 1 according to changes in the terrain. In places with a certain slope, by adjusting the inclination and height, it can ensure that the guide rope 23 and the sampling module 3 always maintain vertical movement, so that the device can work normally in various environments, increasing the adaptability of the device.

[0026] The top plate 11 is provided with a through hole 11a, and the frame 1 also includes a guide tube 14, which is fixedly connected to the top plate 11 and is coaxial with the through hole 11a; the guide rope 23 passes through the through hole 11a and the guide tube 14, and the guide tube 14 further stabilizes the guide rope 23 to the same vertical direction, avoiding the deviation of the guide rope 23 during operation, so that the guide rope 23 can pass through the top plate 11 more smoothly.

[0027] Preferably, Figure 3~4 As shown, a plurality of sampling chambers 32 can be arranged in the shell 31, and a partition plate 33 is arranged between each sampling chamber 32, so that a plurality of cavities are formed in the shell 31, and a sampling chamber 32 can be placed in each cavity, so as to ensure the collection of water samples at multiple depths in one water sampling operation, and reduce the time of multiple operations; each independent sampling chamber 32 will have a valve 31a, so that the sampling chamber 32 can be opened independently at different water depths to collect water samples; a slot 31b is arranged on the inner wall of the shell 31 opposite to the valve 31a, and a sampling door 31c is arranged on the side wall of the shell 31 corresponding to the sampling chamber 32; the sampling chamber 32 is provided with an open end 32b, and the open end 32b faces the valve 31a; a positioning block 32a is arranged on the outer wall of one end of the sampling chamber 32 opposite to the open end 32b, and the positioning block 32a slides in the slot 31b; the matching of the positioning block 32a and the slot 31b The combination increases the stability of the sampling cabin 32 and avoids the movement of the cabin when working in deep water; and the design of the sampling door 31c allows the sampling module 3 to be pulled back to the ground by the guide rope 23 after the sampling work is completed. It is only necessary to place the shell 31 horizontally so that the valve 31a is facing upward (that is, the opening of the sampling cabin 32 is facing upward), and then open the sampling door 31c, and the positioning block 32a can be used to slide in the slot 31b to take out the sampling cabin 32, so that the collected water sample will not be spilled or leaked; the sampling door 31c can be recessed inward as a handrail so that personnel can easily remove the door, and it is fixed to the shell 31 by screws on all sides. When the sampling door 31c needs to be opened on the ground, just unscrew the screws; after taking out the water sample in the sampling cabin 32, the sampling cabin 32 can also be directly rinsed and dried with clean water, which is very convenient.

[0028] In order to avoid excessive buoyancy caused by the empty sampling chamber 32 when just entering the water, a fixedly connected accommodation space can be designed at the lower end of the shell 31 to accommodate a counterweight, so that the sampling chamber 32 can sink to the deep water area. At the same time, the volume of the sampling chamber 32 can also be appropriately reduced to increase the solid area of ​​the shell 31 to ensure that the sampling module 3 can sink into the water.

[0029] The housing 31 is preferably provided with multiple layers of sealing rings 31d at the positions of the sampling door 31c and the valve 31a, which are sealed layer by layer in a stepped manner to effectively prevent the water sample from leaking out.

[0030] The present invention also provides a method for using a high drop groundwater sampling device, such as Figure 6 As shown, the following steps are included: S10: Place the rack 1 at the target groundwater sampling point, adjust the support feet 13 to make the top plate 11 horizontal, insert multiple sampling chambers 32 into the card slots 31b through the positioning blocks 32a, until the sampling chambers 32 enter the interior of the shell 31, the sampling door 31c is closed, and the guide rope 23 passes through the guide tube 14, and then the shell 31 is connected to the guide rope 23; set the target depth D0 and the depth error δd; according to the sampling requirements, multiple target depths D0 can be set; S20: The control system 5 controls the reel assembly 22 to slide on the slide rail 12, and at the same time, the transmission shaft 22b drives the reel 22a to rotate, and the guide rope 23 passes through the guide tube 14, driving the sampling module 3 to descend into the water body; through the operation of the control system 5, the device can stably enter the water; S30: The depth sensor 41 detects the depth D1 from the location of the sampling module 3 to the water surface in real time, and the pressure sensor 42 detects the water pressure P at the location of the sampling module 3 in real time; real-time detection of the sampling module 3 helps to adjust the location of the sampling module 3 in time to ensure that the target location is reached and improve the accuracy of the sampling data; S40: Calculate △D=|D1-D0|; when △D≤δd, a valve 31a is opened, and the sampling chamber 32 corresponding to the valve 31a is sampled, and the valve 31a is closed after the sampling is completed; S50: Continue to descend, repeating steps S30 and S40 in water bodies of different depths until all sampling chambers 32 have finished sampling; sampling of water bodies of different depths can be performed in one descent without multiple descents; S60: The winding assembly 22 drives the sampling module 3 to rise and leave the water body, and the staff removes the sampling module 3 to carry out subsequent work.

[0031] In step S30, the depth D1 is also verified: When the sampling module 3 does not reach the target depth, the pressures p1 and p2 and the distances db1 and db2 from the water surface at two different depths of the sampling module 3 are recorded to obtain the distance db2-db1 between the pressure p1 and the pressure p2; By calculating the pressure difference between two different depths p2-p1=ρ×g×(db2-db1), We can get ρ=(P2-P1) / [g×(db2-db1)], and then use the obtained water density ρ to calculate the real-time depth D2=P2×(db2-db1) / (p2-p1) of the sampling module 3; Where ρ is the water density, g is the acceleration of gravity, and P2 is the pressure detected at D2; D2 calculated by this method is based on the density of the water to be tested, and then the depth of the sampling module 3 is inferred based on the density and water pressure. In this way, when the water surface shakes greatly or there is occlusion interference above the sampling module 3, which may affect the accuracy of the depth sensor 41 detection value, (db2-db1) obtains a height change, so these influences can be removed, and then the density ρ can be obtained through the change in water pressure (P2-P1). After that, a depth D2 can be obtained through the water pressure P2 at each position, and then compared with the depth D1 obtained by the depth sensor 41, it is possible to quickly determine whether the value of the depth sensor 41 is accurate, thereby ensuring the accuracy of sampling.

[0032] Construct D3 = V × (t-t1), V = 2 × π × R × n; Wherein, V is the unwinding speed of the guide rope 23, t is the working time, t1 is the time from the start of work to the first change of the pressure sensor 42, R is the radius of the drum 22a, and n is the rotation speed of the drum 22a; The construction of D3 is to calculate the unwinding speed V of the guide rope 23 based on the radius R and the rotation speed n of the drum 22a, and then use the speed, the difference between the time t1 just entering the water and the total working time t to calculate how long the guide rope 23 is released underwater, thereby inferring the depth of the sampling module 3.

[0033] Finally, when the difference between D2 and D1 and the difference between D3 and D1 are less than the artificially set threshold, D1 is the correct depth; through the above three methods, the position of the sampling module 3 and the depth of the water surface are cross-verified from the combination of multi-dimensional data such as pressure, speed and time, ensuring that the sampling depth has a high degree of credibility during operation.

[0034] During the sampling process, the basic water quality information of the water samples taken is recorded and associated with the corresponding sampling chamber 32 to form a preliminary data report; Recording water quality information while sampling groundwater can ensure that each batch of water samples can be accurately associated with its corresponding depth and location; according to detection requirements, corresponding detectors can be added to the device, and water quality parameters such as pH value, dissolved oxygen, turbidity, temperature, etc. can be recorded in real time during the sampling process to provide detailed data support for subsequent analysis; this data recording mechanism helps to avoid errors caused by information loss or misoperation during the later analysis process, thereby improving the credibility of the data and providing more comprehensive basic data for subsequent environmental monitoring and water quality assessment.

[0035] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high drop groundwater sampling device, characterized in that: include: A frame (1) is arranged on the ground; the frame (1) comprises a top plate (11), and a slide rail (12) is horizontally arranged on the upper end surface of the top plate (11); A winding module (2) is arranged on the frame (1), comprising a slider (21), a winding assembly (22) and a guide rope (23); the slider (21) is arranged on the slide rail (12) and performs linear reciprocating motion; the winding assembly (22) is fixed on the slider (21); the guide rope (23) is arranged on the winding assembly (22), and the winding assembly (22) controls the winding and unwinding of the guide rope (23); the guide rope (23) passes through the top plate (11); The sampling module (3) comprises a housing (31) connected to the guide rope (23), and a sampling chamber (32) arranged inside the housing (31); the housing (31) is provided with a valve (31a) at a position corresponding to the sampling chamber (32); A detection module (4) comprising a depth sensor (41) and a pressure sensor (42); the detection module (4) is mounted on the housing (31) and is used to detect the depth and pressure of the underwater position where the sampling module (3) is located; A control system (5) is used to control the movement of the winding module (2) and control the opening and closing of the valve (31a).

2. The high drop groundwater sampling device according to claim 1, characterized in that: The winding assembly (22) comprises a reel (22a), a fixed seat (22c) and a transmission shaft (22b); the fixed seat (22c) is arranged at two ends of the slide rail (12), and two ends of the transmission shaft (22b) are rotatably mounted on the two fixed seats (22c) respectively; the reel (22a) is sleeved on the transmission shaft (22b) and rotates synchronously with the transmission shaft (22b), and the reel (22a) can move synchronously with the slider (21); the guide rope (23) is wound around the reel (22a).

3. The high drop groundwater sampling device according to claim 2, characterized in that: It comprises a driving module, wherein the driving module is used to drive the rotation of the reel (22a) to drive the unwinding of the guide rope (23); the driving module also drives the sliding block (21) to slide on the sliding rail (12).

4. The high drop groundwater sampling device according to claim 1, characterized in that: The frame (1) further comprises support feet (13) arranged at the bottom of the frame (1); the support feet (13) are used to adjust the height and inclination of the frame (1).

5. The high drop groundwater sampling device according to claim 1, characterized in that: The top plate (11) is provided with a through hole (11a); the frame (1) further comprises a guide tube (14); the guide tube (14) is fixedly connected to the top plate (11) and is coaxial with the through hole (11a); the guide rope (23) passes through the through hole (11a) and the guide tube (14).

6. The high drop groundwater sampling device according to claim 1, characterized in that: A partition plate (33) is arranged between each of the sampling chambers (32); a slot (31b) is arranged on the inner wall of the shell (31) opposite to the valve (31a), and a sampling door (31c) is arranged on the side wall of the shell (31) corresponding to the sampling chamber (32); the sampling chamber (32) is provided with an open end (32b), and the open end (32b) faces the valve (31a); a positioning block (32a) is arranged on the outer wall of one end of the sampling chamber (32) opposite to the open end (32b), and the positioning block (32a) slides in the slot (31b).

7. The high drop groundwater sampling device according to claim 6, characterized in that: The housing (31) is provided with sealing rings (31d) at the positions of the sampling door (31c) and the valve (31a).

8. A method for using a high-drop groundwater sampling device, characterized in that: The high drop groundwater sampling device as claimed in any one of claims 1 to 7 comprises the following steps: S10: placing the rack (1) at the target groundwater sampling point, inserting a plurality of sampling chambers (32) into the card slots (31b) through the positioning blocks (32a), until the sampling chambers (32) enter the interior of the housing (31), closing the sampling door (31c), and connecting the housing (31) to the guide rope (23); setting the target depth D0 and the depth error δd; S20: the control system (5) controls the reel assembly (22) to slide on the slide rail (12), and at the same time the transmission shaft (22b) drives the reel (22a) to rotate, thereby driving the sampling module (3) to descend and enter the water body; S30: the depth sensor (41) detects in real time the depth D1 from the location of the sampling module (3) to the water surface, and the pressure sensor (42) detects in real time the water pressure P at the location of the sampling module (3); S40: Calculate △D=|D1-D0|; when △D≤δd, a valve (31a) is opened, and the sampling chamber (32) corresponding to the valve (31a) is sampled, and the valve (31a) is closed after the sampling is completed; S50: Continue to descend, and repeat steps S30 and S40 until sampling of all sampling chambers (32) is completed; S60: The winding assembly (22) drives the sampling module (3) to rise and leave the water body, and the staff removes the sampling module (3) to complete the sampling.

9. The method for using the high drop groundwater sampling device according to claim 8, characterized in that: In step S30, the depth D1 is also verified: Record the pressures p1 and p2 of the two sampling modules (3) at different depths and the distances db1 and db2 from the water surface; calculate D2=P2×(db2-db1) / (p2-p1); Wherein, P2 is the pressure detected at D2; Construct D3 = V × (t-t1), V = 2 × π × R × n; Wherein, V is the unwinding speed of the guide rope (23), t is the working time, t1 is the time from the start of work to the first change of the pressure sensor (42), R is the radius of the drum (22a), and n is the rotation speed of the drum (22a); Finally, when the difference between D2 and D1 and the difference between D3 and D1 are less than the artificially set threshold, D1 is the correct depth.

10. The method for using the high drop groundwater sampling device according to claim 8, characterized in that: During the sampling process, basic water quality information of the water samples taken is recorded and associated with the corresponding sampling chamber (32) to form a preliminary data report.

Images