A high-drop groundwater sampling device and its usage method

Abstract

The present invention relates to the technical field of groundwater sampling, and in particular to a high-drop groundwater sampling device and its use method. It includes a frame arranged on the ground; the frame includes a top plate, and a slide rail is arranged on the top plate; a winding module is arranged on the frame, which includes a slider, a winding component and a guiding rope. The slider is arranged on the slide rail to make a linear reciprocating motion; the winding component is fixed on the slider; the guiding rope is arranged on the winding component, and the winding component controls the winding and unwinding of the guiding rope; the guiding rope passes through the top plate; the sampling module includes a housing connected to the guiding rope, and a sampling chamber arranged inside the housing; a valve is arranged at the position of the housing corresponding to the sampling chamber; a detection module, which includes a depth sensor and a pressure sensor; the detection module is installed on the housing to detect the depth and pressure; the control system is used to control the movement of the winding module and control the opening and closing of the valve. By sampling at different depths multiple times and verifying the depth, the present invention effectively reduces data errors.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater sampling, and particularly to a high-drop groundwater sampling device and its usage method. Background Art

[0002] High-drop groundwater sampling refers to sampling water bodies at different depths in the deep groundwater environment with the help of professional equipment to obtain physical, chemical, and biological characteristic information of groundwater. As one of the important water resources on the earth, groundwater is widely used in fields such as 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, obvious pressure changes, and technical problems caused by high drops such as equipment stability and data accuracy; moreover, traditional devices lack precise depth sensing and feedback control functions, and 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 sampling data.

[0004] Therefore, there is an urgent need for a high-drop groundwater sampling device and its usage method to solve the above 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 its usage method, which effectively improves data accuracy and reduces sampling data errors by continuously sampling groundwater at different depths and using depth verification of the sampling depth.

[0006] To achieve the above object, the present invention provides a high-drop groundwater sampling device, including:

[0007] A frame, arranged on the ground; the frame includes a top plate, and a slide rail is horizontally arranged on the upper end surface of the top plate;

[0008] A winding module, arranged on the frame, including a slider, a winding assembly, and a guiding rope. The slider is arranged on the slide rail and makes a linear reciprocating motion; the winding assembly is fixed on the slider; the guiding rope is arranged on the winding assembly, and the winding assembly controls the winding and unwinding of the guiding rope; the guiding rope passes through the top plate;

[0009] A sampling module, including a housing connected to the guiding rope, and a sampling chamber arranged inside the housing; a valve is provided at the position of the housing corresponding to the sampling chamber;

[0010] A detection module, including 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 sampling module at the underwater position.

[0011] A control system for controlling the movement of the rewinding module and the opening and closing of the valve.

[0012] Furthermore, the rewinding 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 installed on the two fixed seats; the reel horizontally passes through the slider, 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.

[0013] Furthermore, it includes a driving module for driving the rotation of the reel to drive the unwinding of the guide rope; the driving module also drives the slider to slide on the slide rail.

[0014] Furthermore, the frame also includes support feet arranged at the bottom of the frame; the support feet are used to adjust the height and inclination of the frame.

[0015] Furthermore, through holes are opened in the top plate, and the frame also includes a guide pipe fixedly connected to the top plate and coaxial with the through holes; the guide rope passes through the through holes and the guide pipe.

[0016] Furthermore, partition plates are arranged between the sampling cabins; clamping grooves are arranged on the inner wall of the housing opposite the valve, and sampling doors are arranged on the side walls of the housing corresponding to the sampling cabins; each sampling cabin has an open end facing the valve; positioning blocks are arranged on the outer wall of one end of the sampling cabin opposite the open end, and the positioning blocks slide in the clamping grooves.

[0017] Furthermore, sealing rings are arranged at the positions of the sampling doors and the valve on the housing.

[0018] The present invention also provides a method for using a high-drop groundwater sampling device, including the following steps:

[0019] S10: Place the frame at the target groundwater sampling point, insert the multiple sampling cabins into the clamping grooves through the positioning blocks until the sampling cabins enter the interior of the housing, close the sampling doors, and connect the housing to the guide rope; set the target depth D0 and the depth error δd;

[0020] S20: The control system controls the rewinding 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;

[0021] S30: The depth sensor continuously detects the depth D1 from the position of the sampling module to the water surface, and the pressure sensor continuously detects the water pressure P at the position of the sampling module;

[0022] S40: Calculate △D = |D1 - D0|; when △D ≤ δd, one valve opens, and the sampling cabin corresponding to this valve samples, and after sampling, the valve is closed;

[0023] S50: Continue to descend, repeat steps S30 and S40 until sampling in all sampling compartments is completed;

[0024] S60: The winding assembly drives the sampling module to rise out of the water body, and the staff removes the sampling module to complete the sampling.

[0025] Further, in step S30, it also includes the verification of depth D1:

[0026] Record the pressures p1, p2 at the positions of the sampling module at two different depths and the distances db1, db2 from the water surface; calculate D2 = P2×(db2 - db1) / (p2 - p1);

[0027] where P2 is the pressure detected at D2;

[0028] Construct D3 = V×(t - t1), V = 2×π×R×n;

[0029] where V is the unwinding speed of the guiding 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 radius of the winding drum, and n is the rotational speed of the winding drum;

[0030] 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.

[0031] Further, during the sampling process, record the basic water quality information of the sampled water and associate it with the corresponding sampling compartment to form a preliminary data report.

[0032] The beneficial effects of the present invention are as follows: The present invention winds the guiding rope by the sliding and rotation of the winding assembly on the slide rail, achieving the effect of stabilizing the guiding rope so that it will not have large fluctuations; the sampling module is designed with multiple independent sampling compartments, and in one sampling operation, groundwater at different depths can be continuously sampled. Also, through the verification of the sampling depth, the accuracy of the sampling depth is improved, thereby improving the data accuracy and reducing errors. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0034] Figure 1 It is a schematic structural diagram of the high-drop groundwater sampling device in the present invention;

[0035] Figure 2This is the upper view of the high-drop groundwater sampling device in the present invention;

[0036] Figure 3 This is the structural schematic diagram of the sampling module in the high-drop groundwater sampling device of the present invention;

[0037] Figure 4 This is the cross-sectional schematic diagram of the sampling module in the high-drop groundwater sampling device of the present invention;

[0038] Figure 5 This is the structural schematic diagram of the sampling chamber in the high-drop groundwater sampling device of the present invention;

[0039] Figure 6 This is the step schematic diagram of the usage method of the high-drop groundwater sampling device of the present invention;

[0040] Reference numerals: 1, frame; 11, top plate; 11a, through hole; 12, slide rail; 13, support foot; 14, guide pipe; 2, winding module; 21, slider; 22, winding assembly; 22a, reel; 22b, transmission shaft; 22c, fixed seat; 23, guide rope; 3, sampling module; 31, housing; 31a, valve; 31b, card slot; 31c, sampling door; 31d, sealing ring; 32, sampling chamber; 32a, positioning block; 32b, open end; 33, partition plate; 4, detection module; 41, depth sensor; 42, pressure sensor; 5, control system; 6, drive module. Detailed implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0042] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" 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, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0044] A high-drop groundwater sampling device, as Figures 1 - 5 shown, includes:

[0045] A frame 1, which is arranged on the ground; the frame 1 includes a top plate 11, and a slide rail 12 is horizontally arranged on the upper end surface of the top plate 11;

[0046] A winding module 2, which is arranged on the frame 1, includes a slider 21, a winding assembly 22, and a guiding rope 23. The slider 21 is arranged on the slide rail 12 and makes a linear reciprocating motion; the winding assembly 22 is fixed on the slider 21; the guiding rope 23 is arranged on the winding assembly 22, and the winding assembly 22 controls the winding and unwinding of the guiding rope 23; the guiding rope 23 passes through the top plate 11;

[0047] The slider 21 drives the winding assembly 22 to move on the slide rail 12, and the winding assembly 22 drives the up and down movement of the guiding rope 23. When the guiding rope 23 rises or falls, the winding assembly 22 will move on the slide rail 12 accordingly, so that the position where the guiding rope 23 passes through the top plate 11 remains unchanged and is always on the same vertical line, reducing the swing of the guiding rope 23 during the movement and improving the stability of the device;

[0048] A sampling module 3, which includes a housing 31 and a sampling chamber 32 connected to the guiding rope 23; the sampling chamber 32 is fixedly arranged inside the housing 31; a valve 31a is provided at the position of the housing 31 corresponding to the sampling chamber 32. The valve 31a can be an electromagnetic valve, which is prior art and will not be elaborated here; when reaching a certain depth in the water, the valve 31a is opened, and water will automatically flow into the sampling chamber 32 to complete sampling, and then the valve 31a is closed. The sampling chamber 32 will form a sealed space to prevent the water sample collected at this depth from being contaminated;

[0049] 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 where the sampling module 3 is located; the depth sensor 41 can use sensors such as ultrasonic sensors and laser sensors to detect the depth from the underwater position where the sampling module 3 is located to the water surface; when the detection module 4 is installed at the upper or lower end of the housing 31, only corresponding compensation is required. If the installation range of the detection module 4 on the housing 31 has a small difference relative to the depth, the influence brought by the installation position can also be ignored;

[0050] The control system 5 is used to control the movement of the winding module 2 and control the opening and closing of the valve 31a.

[0051] As Figure 2 shown, the winding assembly 22 includes a winding drum 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, one slider 21 is designed at each end of the transmission shaft 22b, and both ends of the transmission shaft 22b are rotatably installed on the two fixed seats 22c to support the transmission shaft 22b. The winding drum 22a is sleeved on the transmission shaft 22b through structures such as key connection to realize its synchronous rotation with the transmission shaft 22b, and the winding drum 22a can move synchronously with the slider 21; the guide rope 23 is wound around the winding drum 22a. When the transmission shaft 22b drives the winding drum 22a to rotate, the guide rope 23 will also be wound up or released accordingly.

[0052] It includes a drive module. The drive module has two power sources. One is used to drive the rotation of the winding drum 22a to drive the unwinding of the guide rope 23; the other power source of the drive module is used to drive the sliding of the slider 21 on the slide rail 12; the winding drum 22a and the slider 21 can be driven by a motor or other power sources to make the movement of the entire winding module 2 more accurate and stable.

[0053] The frame 1 further includes support feet 13, which are arranged at the bottom of the frame 1 and can use screw regulators; the support feet 13 can adjust the height of the frame 1 according to the 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 move in the vertical direction, enabling the device to work properly in various environments and increasing the adaptability of the device.

[0054] The top plate 11 is provided with a through hole 11a. The frame 1 further includes a guide pipe 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 pipe 14. The guide pipe 14 further stabilizes the guide rope 23 to the same vertical direction, avoiding the deviation of the guide rope 23 during operation and enabling the guide rope 23 to pass through the top plate 11 more smoothly.

[0055] Preferably, as Figures 3 - 4 shown, several sampling chambers 32 can be provided in the housing 31, and partition plates 33 are provided between the sampling chambers 32 to form multiple cavities in the housing 31. A sampling chamber 32 can be placed in each cavity to ensure the collection of water samples at multiple depths in one underwater 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 independently opened at different water depths to collect water samples. A clamping groove 31b is provided on the inner wall of the housing 31 opposite the valve 31a, and a sampling door 31c is provided on the side wall of the housing 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 provided on the outer wall of one end of the sampling chamber 32 opposite the open end 32b, and the positioning block 32a slides in the clamping groove 31b. The cooperation between the positioning block 32a and the clamping groove 31b increases the stability of the sampling chamber 32 and avoids the movement of the chamber body when working in deep water. The design of the sampling door 31c enables the sampling module 3 to be pulled back to the ground by the guiding rope 23 after the sampling work is completed. Just place the housing 31 horizontally with the valve 31a facing up (i.e., the opening of the sampling chamber 32 facing up). At this time, open the sampling door 31c, and the sampling chamber 32 can be taken out by using the positioning block 32a sliding in the clamping groove 31b, so that the collected water samples will not spill or leak. The sampling door 31c can be recessed inward as a handrail to facilitate personnel to remove the door. It is fixed to the housing 31 by means of screws around. When the sampling door 31c needs to be opened on the ground, just unscrew the screws. After the water sample in the sampling chamber 32 is taken out, the sampling chamber 32 can also be directly rinsed and dried with clean water, which is very convenient.

[0056] To avoid excessive buoyancy caused by all the sampling chambers 32 being empty when first entering the water, a fixed-connected accommodation space can be designed at the lower end of the housing 31 to accommodate counterweights, 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 housing 31 to ensure that the sampling module 3 can sink into the water.

[0057] Preferably, multiple layers of sealing rings 31d are provided at the positions of the sampling door 31c and the valve 31a of the housing 31, and are sealed layer by layer in a stepped shape to effectively prevent water samples from leaking outwards.

[0058] The present invention also provides a method for using a high-drop groundwater sampling device, as Figure 6 shown, including the following steps:

[0059] S10: Place the frame 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 housing 31, close the sampling door 31c, pass the guiding rope 23 through the guiding tube 14, and then connect the housing 31 to the guiding rope 23; Set the target depth D0 and the depth error δd; Multiple target depths D0 can be set according to the sampling requirements.

[0060] S20: The control system 5 controls the winding assembly 22 to slide on the slide rail 12. At the same time, the transmission shaft 22b drives the reel 22a to rotate, and the guiding rope 23 passes through the guiding tube 14 to drive the sampling module 3 to descend into the water body; Through the operation of the control system 5, the device can enter the water stably.

[0061] S30: The depth sensor 41 continuously detects the depth D1 from the position of the sampling module 3 to the water surface, and the pressure sensor 42 continuously detects the water pressure P at the position of the sampling module 3; Continuously detecting the sampling module 3 helps to timely adjust the position of the sampling module 3 to ensure reaching the target position and improve the accuracy of the sampling data.

[0062] S40: Calculate △D = |D1 - D0|; When △D ≤ δd, one valve 31a opens, and the sampling chamber 32 corresponding to this valve 31a samples. After sampling, close the valve 31a.

[0063] S50: Continue to descend and repeat steps S30 and S40 in water bodies at different depths until all sampling chambers 32 have completed sampling; It is possible to sample water bodies at different depths in one underwater operation without having to go underwater multiple times.

[0064] S60: The winding assembly 22 drives the sampling module 3 to rise out of the water body, and the staff removes the sampling module 3 for subsequent work.

[0065] In step S30, it also includes the verification of the depth D1:

[0066] When the sampling module 3 has not reached the target depth, record the pressures p1, p2 at the positions of the sampling module 3 at two different depths and the distances db1, db2 from the water surface to obtain the distance db2 - db1 between the positions at pressures p1 and p2.

[0067] By calculating the pressure difference between two different depths p2 - p1 = ρ × g × (db2 - db1),

[0068] ρ = (P2 - P1) / [g × (db2 - db1)] can be obtained, and then using the obtained water density ρ, calculate the real-time depth D2 of the sampling module 3 = P2 × (db2 - db1) / (p2 - p1).

[0069] Where ρ is the water density, g is the acceleration due to gravity, and P2 is the pressure detected at D2;

[0070] D2 calculated by this method is based on first finding the density of the water to be measured, and then inversely calculating the depth of the sampling module 3 at present based on the density and water pressure. In this way, when the water surface fluctuates greatly, or there are occlusion interferences above the sampling module 3 that will affect the accuracy of the detection value of the depth sensor 41, the (db2 - db1) obtains a change amount of height. Therefore, these influences can be removed, and then the density ρ can be obtained through the change in water pressure (P2 - P1). After that, the depth D2 can be obtained through the water pressure P2 at each position, and then it is compared with the depth D1 obtained by the depth sensor 41, so as to quickly determine whether the value of the depth sensor 41 is accurate and ensure the accuracy of sampling.

[0071] Construct D3 = V×(t - t1), where V = 2×π×R×n;

[0072] Where V is the unwinding speed of the guiding 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 winding drum 22a, and n is the rotation speed of the winding drum 22a;

[0073] The construction of D3 is to calculate the unwinding speed V of the guiding rope 23 based on the radius R and rotation speed n of the winding drum 22a, and then use the difference between this speed, the time t1 when it just enters the water and the total working time t to calculate how long the guiding rope 23 has been released underwater, thereby inferring the depth of the sampling module 3.

[0074] Finally, when the difference between D2 and D1 and the difference between D3 and D1 are less than the threshold set by humans, D1 is the correct depth; through the above three methods, cross-verification is carried out on the depth of the sampling module 3 from the combination of multi-dimensional data such as pressure, speed and time, so as to ensure that the sampling depth has a high credibility during work.

[0075] During the sampling process, record the basic water quality information of the water sample taken and associate it with the corresponding sampling chamber 32 to form a preliminary data report;

[0076] Recording water quality information while taking groundwater samples can ensure that each batch of water samples taken can be accurately associated with their corresponding depths and locations. According to the detection requirements, corresponding detectors can be additionally added to this device, and water quality parameters such as pH value, dissolved oxygen, turbidity, temperature, etc. can be recorded in real time during the sampling process, which can 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.

[0077] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-drop groundwater sampling device, characterized in that, Including: A frame (1) is provided on the ground; the frame (1) includes a top plate (11), and a slide rail (12) is horizontally arranged on the upper end surface of the top plate (11); a through hole (11a) is opened on the top plate (11), and the frame (1) further includes a guiding tube (14), the guiding tube (14) is fixedly connected to the top plate (11) and is coaxial with the through hole (11a); A winding module (2) is arranged on the frame (1), including a slider (21), a winding assembly (22) and a guiding rope (23), the slider (21) is arranged on the slide rail (12) and makes a linear reciprocating motion; the winding assembly (22) is fixed on the slider (21); the guiding rope (23) is arranged on the winding assembly (22), and the winding assembly (22) controls the winding and unwinding of the guiding rope (23); the guiding rope (23) passes through the top plate (11); the guiding rope (23) passes through the through hole (11a) and the guiding tube (14); A sampling module (3) includes a housing (31) connected to the guiding rope (23), and a sampling chamber (32) arranged inside the housing (31); a valve (31a) is provided at a position corresponding to the sampling chamber (32) on the housing (31); a partition plate (33) is arranged between the sampling chambers (32); a clamping groove (31b) is arranged on the inner wall of the housing (31) opposite to the valve (31a), and a sampling door (31c) is arranged on the side wall of the housing (31) corresponding to the sampling chamber (32); the sampling chamber (32) has 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 clamping groove (31b); A 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 sampling module (3) at the underwater position; 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); Wherein, the winding assembly (22) includes a winding drum (22a), a fixed seat (22c) and a transmission shaft (22b); the fixed seats (22c) are arranged at both ends of the slide rail (12), and both ends of the transmission shaft (22b) are rotatably installed on the two fixed seats (22c); the winding drum (22a) is sleeved on the transmission shaft (22b) and rotates synchronously with the transmission shaft (22b), and the winding drum (22a) can move synchronously with the slider (21); the guiding rope (23) is wound around the winding drum (22a); It further includes a driving module, and the driving module is used to drive the rotation of the winding drum (22a) to drive the unwinding of the guiding rope (23); the driving module also drives the slider (21) to slide on the slide rail (12).

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

3. The high-drop groundwater sampling device according to claim 1, characterized in that, At the positions of the sampling door (31c) and the valve (31a) of the housing (31), a sealing ring (31d) is provided.

4. A method for using a high-drop groundwater sampling device, characterized in that, For the high-drop groundwater sampling device according to any one of claims 1 to 3, the following steps are included: S10: Place the frame (1) at the target groundwater sampling point, insert 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), close the sampling door (31c), and connect the housing (31) to the guiding rope (23); set the target depth D0 and the depth error δd. S20: The control system (5) controls the winding component (22) to slide on the slide rail (12), and at the same time, the transmission shaft (22b) drives the reel (22a) to rotate, driving the sampling module (3) to descend into the water body. S30: The depth sensor (41) continuously detects the depth D1 from the position where the sampling module (3) is located to the water surface, and the pressure sensor (42) continuously detects the water pressure P at the position where the sampling module (3) is located. S40: Calculate △D = |D1 - D0|; when △D ≤ δd, one valve (31a) is opened, and the sampling chamber (32) corresponding to this valve (31a) samples, and after sampling, the valve (31a) is closed. S50: Continue to descend, and repeat steps S30 and S40 until all sampling chambers (32) have completed sampling. S60: The winding component (22) drives the sampling module (3) to rise and leave the water body, and the staff removes the sampling module (3) to complete sampling.

5. The method for using the high-drop groundwater sampling device according to claim 4, wherein In step S30, the verification of the depth D1 is further included: Record the pressures p1, p2 at the positions where the sampling module (3) is located at two different depths and the distances db1, 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 guiding 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 reel (22a), and n is the rotation speed of the reel (22a). Finally, when the difference between D2 and D1 and the difference between D3 and D1 are less than the threshold set by humans, D1 is the correct depth.

6. The method for using the high-drop groundwater sampling device according to claim 4, characterized in that, During the sampling process, record the basic water quality information of the water samples taken and associate them with the corresponding sampling chambers (32) to form a preliminary data report.

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