Underground water detection sampling device

Abstract

The invention relates to the technical field of sampling devices, in particular to an underground water detection sampling device which comprises a sampling mechanism, a floating ball mechanism and a lifting mechanism. The sampling mechanism comprises a sampling cylinder, a first piston, a middle rod, a first one-way valve, a second one-way valve, an elastic rope and a mounting frame; the sampling cylinder comprises a sampling main cylinder and an end plate, the sampling main cylinder is provided with a first port and a second port in the axial direction of the sampling main cylinder, and the end plate is connected to the sampling main cylinder and blocks the second port; the floating ball mechanism comprises a floating ball, a first floating ball line and a clamping piece; one end of the first floating ball line is connected to the floating ball, and the other end is connected to the clamping piece; the clamping piece is arranged in the positioning through hole in a penetrating mode, and under the condition that the first piston is located at the second limiting position, at least part of the structure of the clamping piece can be inserted into the inserting groove; the lifting mechanism comprises a lifting rope, and one end of the lifting rope is connected to the sampling cylinder. The underground water detection sampling device can be used for sampling a water body without arranging an electric power element, and is simple in structure, stable and reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling devices, and particularly to a groundwater detection sampling device. Background Art

[0002] A water sample collector is a commonly used sampling device in water conservancy projects, which is used to collect water samples at different depths in water bodies (such as rivers, lakes, etc.) for subsequent detection and analysis of the water samples.

[0003] Currently, common water sample collectors usually include a sampling component and a water pump arranged in the sampling component. When in use, the staff puts the sampling component underwater. When the sampling component reaches the specified sampling depth, the water pump works to suck external water into the sampling component, thus completing the sampling. There is a problem with the above water sample collector: since the water pump needs to be driven by electricity, the water sample collector needs to be provided with electrical components that cooperate with the water pump. Since the water sample collector is in an underwater working environment, a sealing component also needs to be provided for the electrical components, which results in a complex structure and a high manufacturing cost of the water sample collector. Therefore, the above problems need to be solved urgently. Summary of the Invention

[0004] Based on this, in view of the problem that the current water sample collector has a complex structure and a high manufacturing cost due to collecting water samples by electric drive, it is necessary to provide a groundwater detection sampling device.

[0005] The above object is achieved by the following technical solutions: A groundwater detection sampling device includes a sampling mechanism, a float mechanism and a lifting mechanism. The sampling mechanism includes a sampling tube, a first piston, an intermediate rod, a first one-way valve, a second one-way valve, an elastic rope and a mounting bracket. The sampling tube includes a sampling main tube and an end plate. The sampling main tube has a first port and a second port along its own axis. The end plate is connected to the sampling main tube and blocks the second port. The sampling tube is also provided with a sampling cavity. The first piston can be movably accommodated in the sampling cavity. The movement stroke of the first piston in the sampling cavity has a first limit position and a second limit position. The first limit position is closer to the first port than the second limit position. The first piston fits with the inner wall of the sampling cavity to form a sampling chamber between the first piston and the end plate. The intermediate rod is passed through the first port. One end of the intermediate rod is connected to the first piston and the other end is located outside the sampling cavity. A plug-in slot is provided on the intermediate rod. The first one-way valve is provided on the end plate. The first one-way valve is conducted from the side of the end plate away from the sampling chamber to the side close to the sampling chamber. The second one-way valve is provided on On the first piston, the second one-way valve is connected from the side of the first piston close to the sampling chamber to the side away from the sampling chamber; one end of the elastic rope is fixedly connected to the first piston, and the other end passes through the first port and is fixedly connected to the outer wall of the sampling main cylinder, and the elastic rope is used to pull the first piston in the direction close to the first port; the mounting bracket is fixedly connected to the sampling main cylinder and is located at the first port, and a positioning through hole is provided on the mounting bracket, and the hole axis direction of the positioning through hole is the same as the radial direction of the intermediate rod; the float mechanism includes a float, a first float line and a clip; one end of the first float line is connected to the float, and the other end is connected to the clip; the clip is passed through the positioning through hole, and when the first piston is in the second extreme position, at least part of the structure of the clip can be inserted into the plug-in slot; the pulling mechanism includes a pulling rope, and one end of the pulling rope is connected to the sampling cylinder.

[0006] Further, the sampling mechanism further includes a plurality of second pistons, a plurality of connecting ropes with the same fixed length, a plurality of third one-way valves, a plurality of connecting cylinders, a plurality of fourth one-way valves, a mounting seat, a screw rod, and a rotary driving assembly; the plurality of second pistons are movably accommodated in the sampling chamber, the plurality of second pistons are arranged at intervals and are attached to the inner side wall of the sampling chamber to divide the sampling chamber into a plurality of sampling sub-chambers; at least one connecting rope is connected between the first piston and the adjacent second piston; at least one connecting rope is connected between the end plate and the adjacent second piston; at least one connecting rope is connected between two adjacent second pistons; at least one third one-way valve is arranged on each second piston, and the third one-way valve conducts from the side of the second piston close to the end plate to the side away from the end plate; the number of connecting cylinders is the same as the number of second pistons, one end of the connecting cylinder is connected to the outer side wall of the sampling main cylinder, and the other end protrudes from the outer side wall of the sampling main cylinder, and the connecting cylinder communicates with the sampling chamber; the plurality of connecting cylinders are arranged at intervals along the axial direction of the sampling main cylinder, and the distance between two adjacent connecting cylinders is the same as the length of the connecting rope, and the distance between the connecting cylinder closest to the end plate and the end plate is greater than the length of the connecting rope; the fourth one-way valve is arranged in each connecting cylinder, and the fourth one-way valve conducts from the side away from the sampling chamber to the side close to the sampling chamber; the mounting seat is arranged on the outer side wall of the sampling main cylinder, and a limiting through hole is arranged on the mounting seat; the screw rod is movably inserted through the limiting through hole and is restricted from rotating by the limiting through hole, and the screw rod is provided with a blocking plane for blocking the port of the connecting cylinder away from the sampling main cylinder; the rotary driving assembly is connected between the mounting frame and the floating ball and is connected to the screw rod; during the process of the sampling cylinder moving downward in the water, the rotary driving assembly is used to drive the screw rod to move towards the end plate until the screw rod blocks all the connecting cylinders; during the process of the sampling cylinder moving upward in the water, the rotary driving assembly is used to drive the screw rod to move away from the end plate, and the first piston moves from the second limit position to the first limit position. When the first piston moves to the first limit position, the screw rod is separated from all the connecting cylinders; when the connecting rope on the side of each second piston facing the end plate is completely straightened, the nearest connecting cylinder on the side of this second piston away from the end plate is separated from the screw rod.

[0007] Furthermore, the rotary drive assembly includes a support frame, a rotating wheel, a coil spring and a second float line; the support frame includes a support leg and a center column, and the support leg is connected between the mounting frame and the center column; the axial direction of the center column is parallel to the axial direction of the intermediate rod, and the center column is provided with a clearance hole along its own axial direction, and the outer wall of the center column is provided with an annular groove, and the inner bottom wall of the annular groove is provided with an annular opening connected to the clearance hole; the rotating wheel is rotatably connected to the center column, and the outer wall of the rotating wheel is provided with a winding ring groove, and the center of the rotating wheel is provided with a threaded through hole, and at least part of the structure of the rotating wheel is embedded in the annular groove, so that a part of the inner side wall of the threaded through hole contacts the inner bottom wall of the annular groove, and the other part of the inner side wall fills the annular opening; the screw is passed through the clearance through hole and the threaded through hole, and the screw It is threadedly connected to the threaded through hole; one end of the coil spring is fixedly connected to the rotor, and the other end is fixedly connected to the center column; one end of the second float line is connected to the rotor, and the other end is connected to the float, and the second float line is wound around the winding ring groove, and the length of the second float line is greater than the length of the first float line; in the process of the sampling cylinder moving downward in the water, the second float line is used to unwind on the rotor to drive the rotor to overcome the elastic force of the coil spring and rotate along the first direction, thereby driving the screw to move in the direction close to the end plate; in the process of the sampling cylinder moving upward in the water, the coil spring is used to drive the rotor to rotate along the second direction to wind up the second float line, thereby driving the screw to move in the direction away from the end plate, and the second direction is opposite to the first direction.

[0008] Furthermore, a limit block is provided at one end of the screw away from the end plate, and at least a part of the structure of the limit block is in contact with the end surface of the center column on the side away from the end plate.

[0009] Furthermore, a guide hole is provided at the center of the mounting frame, the guide hole is coaxially arranged with the sampling main cylinder, and the middle rod passes through the guide hole and fits with the inner wall of the guide hole.

[0010] Furthermore, a limiting piece is provided on the outer side wall of the intermediate rod, and the limiting piece is located between the mounting frame and the first piston. When the limiting piece is in contact with the mounting frame, the first piston is in a first limit position.

[0011] Furthermore, the mounting frame is provided with a threading groove, and the inner side wall of the threading groove is provided with a first guide rod and a second guide rod, the distance from the first guide rod to the central axis of the sampling main cylinder is greater than the radius of the sampling main cylinder, and the distance from the second guide rod to the central axis of the sampling main cylinder is less than the radius of the sampling main cylinder, and the elastic rope is supported on the side of the first guide rod away from the end plate, and the elastic rope is also supported on the side of the second guide rod away from the end plate.

[0012] Furthermore, a plurality of elastic ropes are provided, and the plurality of elastic ropes are evenly distributed along the circumference of the sampling main cylinder; and a plurality of groups of threading grooves, first guide rods, second guide rods and elastic ropes are provided correspondingly.

[0013] Further, a first mounting ring groove is provided on the outer side wall of the first piston, and a first sealing ring is embedded in the first mounting ring groove. The first sealing ring is clamped between the inner bottom wall of the first mounting ring groove and the inner side wall of the sampling inner cavity.

[0014] Further, a second mounting ring groove is provided on the outer side wall of the second piston, and a second sealing ring is embedded in the second mounting ring groove. The second sealing ring is clamped between the inner bottom wall of the second mounting ring groove and the inner side wall of the sampling inner cavity.

[0015] The beneficial effects of the present invention are as follows: The present invention provides a groundwater detection and sampling device, which is provided with a sampling mechanism, a floating ball mechanism and a lifting mechanism that cooperate through a mechanical structure. It can realize automatic sampling at different depth positions of the water body without using power components such as water pumps, and the entire sampling process can be completely realized through mechanical equipment (when the sampling cylinder is connected to the lifting equipment). Therefore, the above groundwater detection and sampling device has beneficial effects such as simple structure, low production cost, safety and reliability, convenient use, and the ability to perform layered sampling of the water body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a groundwater detection and sampling device according to an embodiment of the present invention; Figure 2 is Figure 1 a schematic structural diagram of the groundwater detection and sampling device shown in another perspective; Figure 3 is Figure 1 a left view of the groundwater detection and sampling device shown; Figure 4 is Figure 3 a sectional view of the groundwater detection and sampling device shown in the A-A direction; Figure 5 is Figure 4 an enlarged view of part A in; Figure 6 is Figure 4 a schematic structural diagram of the structure in another state; Figure 7 is Figure 6 an enlarged view of part B in; Figure 8 is Figure 4 a schematic structural diagram of the structure in another state; Figure 9 is Figure 2 a schematic structural diagram of the remaining part of the groundwater detection and sampling device after removing the screw shown.

[0017] Wherein: 100. Groundwater detection and sampling device; 10. Sampling mechanism; 11. Sampling cylinder; 111. Main sampling cylinder; 112. End plate; 113. First port; 114. Second port; 115. Sampling inner cavity; 116. Sampling chamber; 117. Sub-sampling chamber; 12. First piston; 13. Intermediate rod; 131. Insertion slot; 132. Limiting member; 14. First one-way valve; 15. Second one-way valve; 16. Elastic rope; 17. Mounting bracket; 171. Positioning through-hole; 172. Guide hole; 173. Threading groove; 174. First guide rod; 175. Second guide rod; 18. Second piston; 19. Connecting rope; 20. Third one-way valve; 21. Connecting cylinder; 22. Fourth one-way valve; 23. Mounting seat; 231. Limiting through-hole; 2311. Sidewall plane; 2312. Sidewall curved surface; 24. Screw; 241. Sealing plane; 242. Limiting block; 25. Rotary drive assembly; 251. Support frame; 2511. Leg; 2512. Central column; 2513. Relief through-hole; 2514. Annular groove; 2515. Annular opening; 252. Runner; 2521. Reel groove; 2522. Threaded through-hole; 253. Second float line; 30. Float mechanism; 31. Float; 32. First float line; 33. Clamping member; 50. Lifting mechanism; 51. Lifting rope; 52. First balance rope; 53. Second balance rope. Detailed implementation manners

[0018] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. The "connection" and "coupling" mentioned in the present invention, unless otherwise specified, both include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0020] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0021] Please refer to Figures 1 - 5 , the present invention provides a groundwater detection and sampling device 100, which is used for sampling water bodies (such as rivers, lakes, etc.). The above-mentioned groundwater detection and sampling device 100 includes a sampling mechanism 10, a float mechanism 30 and a lifting mechanism 50.

[0022] The sampling mechanism 10 is the main structure for water body sampling. The sampling mechanism 10 includes a sampling cylinder 11, a first piston 12, an intermediate rod 13, a first one-way valve 14, a second one-way valve 15, an elastic rope 16 and a mounting bracket 17.

[0023] The sampling cylinder 11 is the external main structure of the sampling mechanism 10. The sampling cylinder 11 includes a sampling main cylinder 111 and an end plate 112. The sampling main cylinder 111 is generally cylindrical. The sampling main cylinder 111 has a first port 113 and a second port 114 along its own axial direction. The end plate 112 is connected to the sampling main cylinder 111 and seals the second port 114. The sampling cylinder 11 is also provided with a sampling inner cavity 115, and the sampling inner cavity 115 is defined by the sampling main cylinder 111 and the end plate 112.

[0024] The first piston 12 is generally disc-shaped. The first piston 12 is movably accommodated in the sampling inner cavity 115. The moving stroke of the first piston 12 in the sampling inner cavity 115 has a first limit position (see Figure 4 ) and a second limit position (see Figure 6), the first limit position is closer to the first port 113 than the second limit position. It should be noted that the first limit position and the second limit position represent two limit positions in the moving stroke of the first piston 12 in the sampling inner cavity 115. The first limit position represents the position closest to the first port 113 that the first piston 12 can move to in the moving stroke in the sampling inner cavity 115, and the second limit position represents the position farthest from the first port 113 that the first piston 12 can move to in the moving stroke in the sampling inner cavity 115. The first piston 12 fits against the inner side wall of the sampling inner cavity 115 to form a sampling chamber 116 between the first piston 12 and the end plate 112. The above sampling chamber 116 is defined and formed by the first piston 12, the end plate 112 and part of the structure of the sampling main cylinder 111. In fact, the sampling chamber 116 is a part of the sampling inner cavity 115.

[0025] The intermediate rod 13 is generally a round rod. The intermediate rod 13 passes through the first port 113. One end of the intermediate rod 13 is connected to the first piston 12, and the other end is located outside the sampling inner cavity 115. A plug-in groove 131 is provided on the intermediate rod 13 (see Figure 6 ).

[0026] The first one-way valve 14 is arranged on the end plate 112. The first one-way valve 14 conducts from the side of the end plate 112 facing away from the sampling chamber 116 to the side close to the sampling chamber 116. Therefore, the water outside the sampling cylinder 11 can enter the sampling chamber 116 through the first one-way valve 14.

[0027] The second one-way valve 15 is arranged on the first piston 12. The second one-way valve 15 conducts from the side of the first piston 12 close to the sampling chamber 116 to the side facing away from the sampling chamber 116. Therefore, the air in the sampling chamber 116 can be discharged from the sampling chamber 116 through the second one-way valve 15.

[0028] The elastic rope 16 is a rope-like structure with elasticity and a telescopic length. Specifically, it can be a rubber band, an elastic band or other structures. One end of the elastic rope 16 is fixedly connected to the first piston 12, and the other end passes through the first port 113 and is fixedly connected to the outer side wall of the sampling main cylinder 111. The elastic rope 16 is used to pull the first piston 12 in the direction close to the first port 113.

[0029] The mounting bracket 17 is fixedly connected to the sampling main cylinder 111 and is located at the first port 113. A positioning through hole 171 is provided on the mounting bracket 17. The axial direction of the positioning through hole 171 is the same as the radial direction of the intermediate rod 13.

[0030] The float mechanism 30 includes a float 31, a first float line 32, and a clamping member 33. The float 31 can be a hollow sphere that can float on the water surface. The length of the first float line 32 is fixed. One end of the first float line 32 is connected to the float 31, and the other end is connected to the clamping member 33. The clamping member 33 can be a rod-shaped structure. The clamping member 33 passes through the positioning through hole 171. When the first piston 12 is in the second extreme position, at least part of the structure of the clamping member 33 can be inserted into the insertion slot 131 so that the relative position of the intermediate rod 13 and the mounting member is fixed.

[0031] The lifting mechanism 50 includes a lifting rope 51. One end of the lifting rope 51 is connected to the sampling cylinder 11, and the other end is for a staff member to hold or for connection to a lifting device.

[0032] The specific operation process for a staff member to use the above groundwater detection sampling device 100 for underwater sampling is as follows: First, the staff member pushes the first piston 12 towards the end plate 112 through the intermediate rod 13 to the second extreme position (see Figure 6 ). During the above process, the air in the sampling chamber 116 can be discharged through the second one-way valve 15. When the first piston 12 is in the second extreme position, the insertion slot 131 on the intermediate rod 13 is aligned with the positioning through hole 171 on the mounting frame 17. At this time, a part of the clamping member 33 can pass through the positioning through hole 171 and be inserted into the insertion slot 131, so that the relative position of the intermediate rod 13 and the mounting frame 17 is fixed, that is, the first piston 12 and the sampling main cylinder 111 are kept relatively stationary. Then, the staff member can hold the lifting rope 51 by hand or connect the lifting rope 51 to a lifting device, and place both the sampling cylinder 11 and the float 31 into the water body to be sampled and keep the sampling cylinder 11 roughly horizontal (such as Figure 1 and Figure 2 shown state). At this time, the float 31 will float on the water surface and the position of the float 31 hardly changes, while the sampling cylinder 11 will sink in the water body. The staff member lowers the sampling cylinder 11 to the expected sampling depth in the water body through the lifting rope 51. When the sampling cylinder 11 reaches the expected sampling depth, the first float line 32 is roughly straightened in the vertical direction and just pulls the clamping member 33 out of the insertion slot 131. At this time, the elastic rope 16 can pull the first piston 12 towards the first port 113. Under the action of pressure, the water outside the sampling cylinder 11 can enter the sampling chamber 116 through the first one-way valve 14 to achieve sampling of the water body at the expected sampling depth. When the first piston 12 moves to the first extreme position, the sampling ends. Then, the staff member pulls the device out of the water through the lifting rope 51, and the entire sampling process ends.

[0033] In summary, the above groundwater detection sampling device 100 can achieve underwater sampling of water bodies without setting up power components such as water pumps, and the entire sampling process can be fully realized by mechanical equipment (when the lifting rope 51 is connected to the lifting device). Therefore, the above groundwater detection sampling device 100 has beneficial effects such as simple structure, low production cost, safety and reliability, and convenient use.

[0034] In some embodiments, the lifting mechanism 50 further includes a first balance rope 52 and a second balance rope 53. One end of the first balance rope 52 is connected to the lifting rope 51, and the other end is connected to the outer side wall of the sampling main cylinder 111. One end of the second balance rope 53 is connected to the lifting rope 51, and the other end is connected to the outer side wall of the sampling main cylinder 111. The connection position of the first balance rope 52 and the sampling main cylinder 111 is farther from the end plate 112 than the connection position of the second balance rope 53 and the sampling main cylinder 111. The first balance rope 52, the second balance rope 53 and the sampling main cylinder 111 generally form a triangular structure.

[0035] Through the above settings, the stability of the lifting rope 51 pulling the sampling cylinder 11 to move up and down underwater can be improved, which is beneficial to the sampling cylinder 11 always maintaining a horizontal state during the underwater movement, and thus improves the sampling accuracy.

[0036] In some embodiments, a first installation ring groove (not shown in the figure) is provided on the outer side wall of the first piston 12, and a first sealing ring (not shown in the figure) is embedded in the first installation ring groove. The first sealing ring is clamped by the inner bottom wall of the first installation ring groove and the inner side wall of the sampling inner cavity 115.

[0037] Through the above settings, the first sealing ring can form a sealing structure between the outer side wall of the first piston 12 and the inner side wall of the sampling inner cavity 115, thereby preventing air leakage or water leakage in the sampling chamber 116, ensuring that the sampling process can proceed smoothly and ensuring the accuracy and reliability of the sampling results.

[0038] Please refer to Figures 3 - 8 , in some embodiments, the sampling mechanism 10 further includes a plurality of second pistons 18, a plurality of connecting ropes 19 with fixed and equal lengths, a plurality of third one-way valves 20, a plurality of connecting cylinders 21, a plurality of fourth one-way valves 22, a mounting seat 23, a screw 24 and a rotary driving assembly 25.

[0039] The second piston 18 is generally in the shape of a round cake. A plurality of second pistons 18 are movably accommodated in the sampling chamber 116. The plurality of second pistons 18 are arranged at intervals and are in contact with the inner side wall of the sampling chamber 116 to divide the sampling chamber 116 into a plurality of sampling sub-chambers 117. It should be noted that the sampling sub-chamber 117 can be between two opposite second pistons 18, or between the first piston 12 and the second piston 18 adjacent to the first piston 12, or between the end plate 112 and the second piston 18 adjacent to the end plate 112; the sampling sub-chamber 117 is actually a part of the sampling chamber 116 and also a part of the sampling inner cavity 115.

[0040] At least one connecting rope 19 is connected between the first piston 12 and the second piston 18 adjacent thereto. At least one connecting rope 19 is connected between the end plate 112 and the second piston 18 adjacent thereto. At least one connecting rope 19 is connected between two adjacent second pistons 18. Through the above settings, when the first piston 12 moves to the first extreme position, each connecting rope 19 is in a completely straightened state, and at this time, the volumes of the respective sampling sub-chambers 117 are the same.

[0041] At least one third one-way valve 20 is provided on each second piston 18. The third one-way valve 20 conducts from the side of the second piston 18 close to the end plate 112 to the side away from the end plate 112, so that the gas in each sampling sub-chamber 117 can be discharged from the sampling chamber 116 through the third one-way valve 20 and the second one-way valve 15.

[0042] The connecting cylinder 21 is generally in the shape of a cylinder. The number of connecting cylinders 21 is the same as the number of second pistons 18. One end of the connecting cylinder 21 is connected to the outer side wall of the sampling main cylinder 111, and the other end protrudes from the outer side wall of the sampling main cylinder 111. The connecting cylinder 21 communicates with the sampling chamber 116. The plurality of connecting cylinders 21 are arranged at intervals along the axial direction of the sampling main cylinder 111. The distance between two adjacent connecting cylinders 21 is the same as the length of the connecting rope 19. The distance between the connecting cylinder 21 closest to the end plate 112 and the end plate 112 is greater than the length of the connecting rope 19. Through the above settings, when the first piston 12 moves to the first extreme position, except for the sampling sub-chamber 117 between the end plate 112 and the second piston 18 adjacent thereto, the remaining plurality of sampling sub-chambers 117 just correspond to and communicate with the plurality of connecting cylinders 21 one by one.

[0043] The fourth one-way valve 22 is provided in each connecting cylinder 21. The fourth one-way valve 22 conducts from the side away from the sampling chamber 116 to the side close to the sampling chamber 116, so that the water outside the sampling cylinder 11 can enter the sampling chamber 116 through the fourth one-way valve 22.

[0044] The mounting base 23 is arranged on the outer side wall of the main sampling cylinder 111. A limiting through hole 231 is provided on the mounting base 23. The inner side wall of the limiting through hole 231 is a smooth surface, and the axial direction of the limiting through hole 231 is parallel to the axial direction of the main sampling cylinder 111. Please refer to Figure 4 and Figure 9 , the inner side wall of the limiting through hole 231 has a side wall plane 2311 and a side wall curved surface 2312. The side wall plane 2311 is a plane, and the side wall plane 2311 is coplanar with the plane where the port at the end of the connecting cylinder 21 away from the main sampling cylinder 111 is located. The side wall curved surface 2312 is generally an arc-shaped curved surface that bends towards the main sampling cylinder 111. The side wall plane 2311 and the side wall curved surface 2312 jointly enclose the inner side wall of the limiting through hole 231.

[0045] The screw rod 24 is generally a cylindrical threaded rod. The screw rod 24 is movably inserted through the limiting through hole 231 and is restricted from rotating by the limiting through hole 231. The screw rod 24 is provided with a blocking plane 241. The blocking plane 241 extends along the axial direction of the screw rod 24, and the blocking plane 241 is used to block the port at the end of the connecting cylinder 21 away from the main sampling cylinder 111. Specifically, the blocking plane 241 of the screw rod 24 fits with the side wall plane 2311 of the limiting through hole 231. Therefore, the limiting through hole 231 can prevent the screw rod 24 from rotating inside the limiting through hole 231, and since the blocking plane 241 can fit with the end face at the end of the connecting cylinder 21 away from the main sampling cylinder 111, the blocking plane 241 can block the port at the end of the connecting cylinder 21 away from the main sampling cylinder 111.

[0046] The rotation driving assembly 25 is connected between the mounting frame 17 and the floating ball 31 and is connected to the screw rod 24. During the process of the sampling cylinder 11 moving downward in water, the rotation driving assembly 25 is used to drive the screw rod 24 to move towards the end plate 112 until the screw rod 24 blocks all of the connecting cylinder 21. During the process of the sampling cylinder 11 moving upward in water, the rotation driving assembly 25 is used to drive the screw rod 24 to move away from the end plate 112, and the first piston 12 moves from the second limit position to the first limit position. When the first piston 12 moves to the first limit position, the screw rod 24 separates from all of the connecting cylinder 21; when the connecting ropes 19 on the side of each second piston 18 facing the end plate 112 are completely straightened, the nearest connecting cylinder 21 on the side of this second piston 18 facing away from the end plate 112 separates from the screw rod 24.

[0047] The specific operation process for underwater sampling by the staff using the groundwater detection sampling device 100 in the above embodiment is as follows: First, the staff moves the screw rod 24 away from the end plate 112 through the rotation drive assembly 25 so that the screw rod 24 is separated from all the connecting cylinders 21. Then, the staff pushes the first piston 12 and the second piston 18 towards the end plate 112 through the intermediate rod 13. During this process, the air in the multiple sampling sub-chambers 117 can be discharged through the third one-way valve 20 and the second one-way valve 15. When the first piston 12 moves to the second limit position, the insertion slot 131 on the intermediate rod 13 is aligned with the positioning through-hole 171 on the mounting bracket 17. At this time, a part of the clamping member 33 can pass through the positioning through-hole 171 and be inserted into the insertion slot 131, so that the position of the intermediate rod 13 and the mounting bracket 17 is relatively fixed, that is, the first piston 12 is kept relatively stationary with respect to the sampling main cylinder 111. Then, the staff can hold the lifting rope 51 by hand or connect the lifting rope 51 to a lifting device, and put both the sampling cylinder 11 and the floating ball 31 into the water body to be sampled and keep the sampling cylinder 11 roughly horizontal (such as Figure 1 and Figure 2In the state shown, the floating ball 31 will float on the surface of the water body and its position on the water surface will hardly change, while the sampling cylinder 11 will sink in the water body. During the sinking process of the sampling cylinder 11, the rotary drive assembly 25 will continuously drive the screw rod 24 to move towards the end plate 112, so the screw rod 24 will gradually block all the connecting cylinders 21. During the sinking process of the sampling cylinder 11, the minimum pressure required for the fourth one-way valve 22 to conduct is always greater than the water pressure outside the sampling cylinder 11, so the water outside the sampling cylinder 11 will not enter the interior of the main sampling cylinder 111 from the connecting cylinder 21. Similarly, the minimum pressure required for the first one-way valve 14 to conduct is also always greater than the water pressure outside the sampling cylinder 11, so the water outside the sampling cylinder 11 will not enter the interior of the main sampling cylinder 111 from the first one-way valve 14. When the staff lowers the sampling cylinder 11 to the position of the first expected sampling depth (the deepest sampling depth) in the water body through the lifting rope 51 (at this time, the screw rod 24 has blocked all the connecting cylinders 21), the first floating ball wire 32 is stretched straight along the vertical direction and just pulls the clamping member 33 out of the insertion slot 131. At this time, the elastic rope 16 can pull the first piston 12 towards the first port 113. Since the screw rod 24 blocks all the connecting cylinders 21 at this moment, several sampling sub-chambers 117 that are not adjacent to the end plate 112 are in a sealed state. So when the first piston 12 starts to move away from the end plate 112, the first piston 12 will first move a certain distance away from the end plate 112, so that a negative pressure environment is formed in the sampling sub-chamber 117 between the first piston 12 and the adjacent second piston 18 (the second piston 18 farthest from the end plate 112), so that the second piston 18 farthest from the end plate 112 moves a certain distance away from the end plate 112. Similarly, the remaining second pistons 18 will also be moved a certain distance away from the end plate 112 in the order from far to near the end plate 112. Finally, as the elastic rope 16 continues to pull the first piston 12 away from the end plate 112, the first piston 12 and all the second pistons 18 will move synchronously away from the end plate 112, so that the volume of the sampling sub-chamber 117 between the end plate 112 and the adjacent second piston 18 (that is, the sampling sub-chamber 117 closest to the end plate 112) increases, so that a negative pressure environment is formed inside the sampling sub-chamber 117 closest to the end plate 112. Under the combined action of the negative pressure in the above sampling sub-chamber 117 and the water pressure outside the sampling cylinder 11 (the resultant force of the negative pressure in the above sampling sub-chamber 117 and the water pressure outside the sampling cylinder 11 is greater than the minimum pressure required for the first one-way valve 14 to conduct), the water outside the sampling cylinder 11 can enter the sampling sub-chamber 117 closest to the end plate 112 through the first one-way valve 14 to achieve sampling of the water body at the first expected sampling depth;After pausing for a moment until the sampling at the position of the first predicted sampling depth is completed, at this time, the connecting rope 19 between the end plate 112 and the adjacent second piston 18 is completely straightened, and the screw rod 24 still remains in a state of blocking all the connecting cylinders 21. Then, the staff manually lifts or uses a lifting device to lift the sampling cylinder 11 so that the sampling cylinder 11 moves upward approximately vertically underwater. During the above process, the rotary drive assembly 25 drives the screw rod 24 to move away from the end plate 112. When the sampling cylinder 11 moves upward to the position of the second predicted sampling depth (the second deepest sampling depth), at this time, the screw rod 24 separates from the connecting cylinder 21 closest to the end plate 112 and blocks the remaining connecting cylinders 21. As the first piston 12 continues to move away from the end plate 112, the second piston 18 closest to the end plate 112 is restricted by the connecting rope 19 between itself and the end plate 112 and cannot move, and the remaining second pistons 18 continue to move synchronously with the first piston 12 away from the end plate 112, so that the volume of the sampling sub-chamber 117 (i.e., the sampling sub-chamber 117 second closest to the end plate 112) between the second piston 18 closest to the end plate 112 and the second piston 18 second closest to the end plate 112 increases, thereby creating a negative pressure environment inside the sampling sub-chamber 117 second closest to the end plate 112. Under the combined action of the negative pressure in the above sampling sub-chamber 117 and the water pressure outside the sampling cylinder 11 (the resultant force of the negative pressure in the above sampling sub-chamber 117 and the water pressure outside the sampling cylinder 11 is greater than the minimum pressure required for the fourth one-way valve 22 to conduct), the water outside the sampling cylinder 11 enters the sampling sub-chamber 117 second closest to the end plate 112 through the fourth one-way valve 22 closest to the end plate 112 to achieve sampling of the water body at the second predicted sampling depth; after pausing for a moment until the sampling at the position of the second predicted sampling depth is completed, at this time, the connecting rope 19 between the second piston 18 closest to the end plate 112 and the second piston 18 second closest to the end plate 112 is completely straightened, and in addition to separating from the connecting cylinder 21 closest to the end plate 112, the screw rod 24 blocks all the remaining connecting cylinders 21. Then, the staff manually lifts or uses a lifting device to lift the sampling cylinder 11 so that the sampling cylinder 11 moves upward approximately vertically underwater to the third predicted sampling depth (the third deepest sampling depth) to achieve sampling of the water body at the third predicted sampling depth; the above process is continuously repeated until the first piston 12 moves to the first limit position, at which time the screw rod 24 separates from all the connecting cylinders 21, and each sampling sub-chamber 117 has also completed sampling. Specifically, the closer the sampling sub-chamber 117 is to the end plate 112, the deeper the sampling depth of the water sample obtained by the sampling sub-chamber 117.

[0048] In summary, the above groundwater detection sampling device 100 can achieve automatic sampling at different depth positions of the water body without setting up power components such as water pumps, and the entire sampling process can be completely realized by mechanical equipment (when the lifting rope 51 is connected to the lifting device). Therefore, the above groundwater detection sampling device 100 has the beneficial effects of simple structure, low production cost, safety and reliability, convenient use, and the ability to sample water layers.

[0049] In some embodiments, a second installation ring groove (not shown in the figure) is provided on the outer side wall of the second piston 18, and a second sealing ring (not shown in the figure) is embedded in the second installation ring groove. The second sealing ring is clamped by the inner bottom wall of the second installation ring groove and the inner side wall of the sampling inner cavity 115.

[0050] Through the above setting, the second sealing ring can form a sealing structure between the outer side wall of the second piston 18 and the inner side wall of the sampling inner cavity 115, thereby avoiding air leakage or water leakage in the sampling sub-chamber 117, ensuring that the sampling process can proceed smoothly and ensuring the accuracy and reliability of the sampling results.

[0051] In some embodiments, the rotary drive assembly 25 includes a support frame 251, a runner 252, a coil spring (not shown in the figure), and a second floating ball wire 253.

[0052] The support frame 251 includes support legs 2511 and a central column 2512. The central column 2512 is generally cylindrical, and the support legs 2511 are connected between the mounting frame 17 and the central column 2512. The axis of the central column 2512 is parallel to the axis of the intermediate rod 13. The central column 2512 is provided with a relief through hole 2513 along its own axis. An annular groove 2514 is provided on the outer side wall of the central column 2512, and an annular port 2515 communicating with the relief through hole 2513 is provided on the inner bottom wall of the annular groove 2514.

[0053] The runner 252 is generally disc-shaped, and the runner 252 is rotatably connected to the central column 2512. A winding ring groove 2521 is provided on the outer side wall of the runner 252, and a threaded through hole 2522 is provided at the center of the runner 252. At least part of the structure of the runner 252 is embedded in the annular groove 2514, so that a part of the inner side wall of the threaded through hole 2522 contacts the inner bottom wall of the annular groove 2514, and the other part of the inner side wall fills the annular port 2515. The screw rod 24 passes through the relief through hole 2513 and the threaded through hole 2522, and the screw rod 24 is in threaded connection with the threaded through hole 2522.

[0054] One end of the coil spring is fixedly connected to the runner 252, and the other end of the coil spring is fixedly connected to the central column 2512. The coil spring is used to drive the runner 252 to rotate.

[0055] One end of the second floating ball wire 253 is connected to the rotating wheel 252, and the other end is connected to the floating ball 31. The second floating ball wire 253 is wound and coiled in the winding ring groove 2521, and the length of the second floating ball wire 253 is greater than that of the first floating ball wire 32.

[0056] During the process of the sampling cylinder 11 moving downward in the water, the second floating ball wire 253 is used to unwind on the rotating wheel 252 to drive the rotating wheel 252 to rotate along the first direction against the elastic force of the spiral spring, thereby driving the screw rod 24 to move in the direction close to the end plate 112.

[0057] During the process of the sampling cylinder 11 moving upward in the water, the spiral spring is used to drive the rotating wheel 252 to rotate along the second direction to wind up the second floating ball wire 253, thereby driving the screw rod 24 to move in the direction away from the end plate 112, and the second direction is opposite to the first direction.

[0058] Through the above settings, during the process of the sampling cylinder 11 moving downward in the water, since the floating ball 31 is connected to one end of the second floating ball wire 253, and the other end of the second floating ball wire 253 sinks following the sampling cylinder 11, the second floating ball wire 253 will drive the rotation to rotate along the first direction to achieve unwinding. During the above process, since the rotating wheel 252 rotates relative to the central column 2512 (this process will overcome the elastic force of the spiral spring), the threaded through hole 2522 on the rotating wheel 252 is in threaded cooperation with the screw rod 24, and the screw rod 24 is restricted from rotating, so the screw rod 24 will move in the axial direction of the central column 2512 in the direction close to the end plate 112 to achieve the sealing of the connecting cylinder 21. During the process of the sampling cylinder 11 being lifted and moving upward in the water, since the compressed spiral spring is released, the elastic force of the spiral spring will drive the rotating wheel 252 to rotate along the second direction to achieve the winding of the second floating ball wire 253. Since the second direction is opposite to the first direction, the rotating wheel 252 will drive the screw rod 24 to move in the axial direction of the central column 2512 in the direction away from the end plate 112 to achieve the successive separation of the screw rod 24 from the plurality of connecting cylinders 21, thereby realizing the layered sampling of the water bodies at different depths by the sampling cylinder 11. The realization of the above functions can be achieved by designing appropriate production parameters, and the production parameters at least include the following data: the length of the connecting rope 19, the pitch of the screw rod 24, the diameter of the rotating wheel 252, etc.

[0059] In some embodiments, the rotating wheel 252 is detachably connected to the central column 2512. By replacing the rotating wheel 252 with different diameters, the staff can change the deepest sampling depth that the sampling cylinder 11 can sample, and can also change the spacing between two adjacent sampling depths.

[0060] In some embodiments, a limiting block 242 is provided at one end of the screw rod 24 away from the end plate 112, and at least part of the structure of the limiting block 242 is in contact with the end face on the side of the central column 2512 facing away from the end plate 112. Through the above arrangement, the limiting block 242 can prevent the screw rod 24 from separating from the runner 252 during the process of moving towards the end plate 112, and can improve the connection stability between the screw rod 24 and the runner 252.

[0061] In some embodiments, a guiding hole 172 is provided at the center of the mounting frame 17. The guiding hole 172 is coaxially arranged with the sampling main cylinder 111. The intermediate rod 13 passes through the guiding hole 172 and is in contact with the inner side wall of the guiding hole 172. Through the above arrangement, the guiding hole 172 can guide the movement of the intermediate rod 13, so that the intermediate rod 13 moves stably along the axial direction of the sampling main cylinder 111 to improve the stability of the sampling process. In some embodiments, a limiting member 132 is provided on the outer side wall of the intermediate rod 13. The limiting member 132 can specifically be a block structure or an annular structure. The limiting member 132 is located between the mounting frame 17 and the first piston 12. When the limiting member 132 is in contact with the mounting frame 17 (see Figure 5 ), the first piston 12 is in the first extreme position. Through the above arrangement, the limiting member 132 is used to prevent the first piston 12 from continuously moving in the direction away from the end plate 112 to avoid the first piston 12 being completely removed from the sampling main cylinder 111.

[0062] In some embodiments, the mounting bracket 17 is provided with a wire threading groove 173. The inner side walls of the wire threading groove 173 are provided with a first guide rod 174 and a second guide rod 175. Both the first guide rod 174 and the second guide rod 175 are round rods. The distance from the first guide rod 174 to the central axis of the sampling main cylinder 111 is greater than the radius of the sampling main cylinder 111, and the distance from the second guide rod 175 to the central axis of the sampling main cylinder 111 is less than the radius of the sampling main cylinder 111. The elastic rope 16 abuts against one side of the first guide rod 174 away from the end plate 112, and the elastic rope 16 also abuts against one side of the second guide rod 175 away from the end plate 112. Through the above arrangement, the first guide rod 174 and the second guide rod 175 are used to change the extending direction of the elastic rope 16, so that one end of the elastic rope 16 can be connected to the first piston 12 and the other end can be connected to the outer side wall of the sampling main cylinder 111. Moreover, the first guide rod 174 and the second guide rod 175 can stretch the elastic rope 16 under force, so that the elastic rope 16 can generate a pulling force that pulls the first piston 12 towards the first port 113. Further, since the distance from the first guide rod 174 to the central axis of the sampling main cylinder 111 is greater than the radius of the sampling main cylinder 111, the part of the elastic rope 16 located outside the sampling main cylinder 111 hardly fits against the outer side wall of the sampling main cylinder 111, which can reduce the friction between the elastic rope 16 and the outer side wall of the sampling main cylinder 111; since the distance from the second guide rod 175 to the central axis of the sampling main cylinder 111 is less than the radius of the sampling main cylinder 111, the part of the elastic rope 16 located inside the sampling main cylinder 111 (i.e., located in the sampling inner cavity 115) hardly fits against the inner side wall of the sampling main cylinder 111 (i.e., the inner side wall of the sampling inner cavity 115), which can reduce the friction between the elastic rope 16 and the inner side wall of the sampling main cylinder 111.

[0063] In some embodiments, a plurality of elastic ropes 16 are provided. The plurality of elastic ropes 16 are evenly distributed at intervals along the circumferential direction of the sampling main cylinder 111. There are multiple groups of the wire threading groove 173, the first guide rod 174 and the second guide rod 175 corresponding to the elastic ropes 16. As a specific example, in this embodiment, three elastic ropes 16 are provided. In other embodiments, the elastic ropes 16 can also be provided with any number such as two, four, five, etc.

[0064] Through the above arrangement, the plurality of elastic ropes 16 can improve the stability of the pulling force on the first piston 12, so that the movement of the first piston 12 towards the first port 113 is smoother and more stable, and further the process of the water outside the sampling cylinder 11 entering the sampling chamber 116 during the sampling process is more stable and reliable, that is, the stability of the sampling cylinder 11 for water sampling can be improved.

[0065] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0066] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. A groundwater detection and sampling device, characterized in that, The invention comprises a sampling mechanism (10), wherein the sampling mechanism (10) comprises: A sampling cylinder (11), comprising a sampling main cylinder (111) and an end plate (112), wherein the sampling main cylinder (111) has a first port (113) and a second port (114) along its own axial direction, and the end plate (112) is connected to the sampling main cylinder (111) and blocks the second port (114); the sampling cylinder (11) is further provided with a sampling inner cavity (115); a first piston (12) movably accommodated in the sampling inner cavity (115); a movement stroke of the first piston (12) in the sampling inner cavity (115) having a first limit position and a second limit position, wherein the first limit position is closer to the first port (113) than the second limit position; the first piston (12) is in contact with the inner side wall of the sampling inner cavity (115) to form a sampling chamber (116) between the first piston (12) and the end plate (112); An intermediate rod (13) is provided through the first port (113), one end of the intermediate rod (13) is connected to the first piston (12), and the other end is located outside the sampling cavity (115); a plug-in slot (131) is provided on the intermediate rod (13); a first one-way valve (14) disposed on the end plate (112), the first one-way valve (14) being connected from a side of the end plate (112) away from the sampling chamber (116) to a side close to the sampling chamber (116); a second one-way valve (15) disposed on the first piston (12), the second one-way valve (15) being connected from a side of the first piston (12) close to the sampling chamber (116) to a side away from the sampling chamber (116); an elastic cord (16), one end of which is fixedly connected to the first piston (12), and the other end of which passes through the first port (113) and is fixedly connected to the outer wall of the sampling main cylinder (111), the elastic cord (16) being used to pull the first piston (12) toward the first port (113); A mounting frame (17) is fixedly connected to the sampling main cylinder (111) and is located at the first port (113); a positioning through hole (171) is provided on the mounting frame (17); and the hole axis direction of the positioning through hole (171) is the same as the radial direction of the intermediate rod (13); The groundwater detection sampling device further comprises a float mechanism (30), the float mechanism (30) comprising a float (31), a first float line (32) and a clamping member (33); one end of the first float line (32) is connected to the float (31), and the other end is connected to the clamping member (33); the clamping member (33) is passed through the positioning through hole (171), and when the first piston (12) is in the second extreme position, at least a part of the structure of the clamping member (33) can be inserted into the insertion groove (131); The groundwater detection sampling device further includes a lifting mechanism (50), and the lifting mechanism (50) includes a lifting rope (51), and one end of the lifting rope (51) is connected to the sampling cylinder (11).

2. The groundwater detection and sampling device according to claim 1, wherein, The sampling mechanism (10) further includes: a plurality of second pistons (18), the plurality of second pistons (18) are movably accommodated in the sampling chamber (116), the plurality of second pistons (18) are arranged at intervals and are in contact with the inner side wall of the sampling chamber (116) to divide the sampling chamber (116) into a plurality of sampling sub-chambers (117); a plurality of connecting ropes (19) with fixed and the same length; at least one of the connecting ropes (19) is connected between the first piston (12) and the adjacent second piston (18); at least one of the connecting ropes (19) is connected between the end plate (112) and the adjacent second piston (18); at least one connecting rope (19) is connected between two adjacent second pistons (18); a plurality of third one-way valves (20), at least one of the third one-way valves (20) is arranged on each second piston (18), and the third one-way valve (20) is conducted from the side of the second piston (18) close to the end plate (112) to the side away from the end plate (112); a plurality of connecting cylinders (21), the number of the connecting cylinders (21) is the same as the number of the second pistons (18), one end of the connecting cylinder (21) is connected to the outer side wall of the sampling main cylinder (111), and the other end protrudes from the outer side wall of the sampling main cylinder (111), and the connecting cylinder (21) communicates with the sampling chamber (116); the plurality of connecting cylinders (21) are arranged at intervals along the axial direction of the sampling main cylinder (111), the distance between two adjacent connecting cylinders (21) is the same as the length of the connecting rope (19), and the distance between the connecting cylinder (21) closest to the end plate (112) and the end plate (112) is greater than the length of the connecting rope (19); a plurality of fourth one-way valves (22), the fourth one-way valve (22) is arranged in each connecting cylinder (21), and the fourth one-way valve (22) is conducted from the side away from the sampling chamber (116) to the side close to the sampling chamber (116); a mounting seat (23), arranged on the outer side wall of the sampling main cylinder (111), and a limiting through hole (231) is arranged on the mounting seat (23); a screw rod (24), movably passing through the limiting through hole (231) and being restricted from rotating by the limiting through hole (231), the screw rod (24) is provided with a blocking plane (241), and the blocking plane (241) is used for blocking the port of the connecting cylinder (21) away from the sampling main cylinder (111); A rotation drive assembly (25) is connected between the mounting bracket (17) and the floating ball (31) and is connected to the screw rod (24); during the process of the sampling cylinder (11) moving downward in water, the rotation drive assembly (25) is used to drive the screw rod (24) to move towards the end plate (112) until the screw rod (24) blocks all of the connecting cylinders (21). During the process of the sampling cylinder (11) moving upward in water, the rotation drive assembly (25) is used to drive the screw rod (24) to move away from the end plate (112), and the first piston (12) moves from the second limit position to the first limit position. When the first piston (12) moves to the first limit position, the screw rod (24) separates from all of the connecting cylinders (21); when the connecting ropes (19) on the side of each second piston (18) facing the end plate (112) are completely straightened, the nearest connecting cylinder (21) on the side of this second piston (18) facing away from the end plate (112) separates from the screw rod (24).

3. The groundwater detection and sampling device according to claim 2, characterized in that, The rotation drive assembly (25) includes: A support frame (251), including legs (2511) and a central column (2512), the legs (2511) are connected between the mounting bracket (17) and the central column (2512); the axial direction of the central column (2512) is parallel to the axial direction of the intermediate rod (13), a relief through hole (2513) is provided along the axial direction of the central column (2512), an annular groove (2514) is provided on the outer side wall of the central column (2512), and an annular opening (2515) communicating with the relief through hole (2513) is provided on the inner bottom wall of the annular groove (2514). A runner (252) is rotatably connected to the central column (2512), a winding ring groove (2521) is provided on the outer side wall of the runner (252), a threaded through hole (2522) is provided at the center of the runner (252), at least part of the structure of the runner (252) is embedded in the annular groove (2514) so that a part of the inner side wall of the threaded through hole (2522) contacts the inner bottom wall of the annular groove (2514), and another part of the inner side wall fills the annular opening (2515); the screw rod (24) passes through the relief through hole (2513) and the threaded through hole (2522), and the screw rod (24) is in threaded connection with the threaded through hole (2522). A torsion spring, one end of the torsion spring is fixedly connected to the runner (252), and the other end is fixedly connected to the central column (2512). A second floating ball wire (253), one end is connected to the runner (252), and the other end is connected to the floating ball (31), the second floating ball wire (253) is wound and wound in the winding ring groove (2521), and the length of the second floating ball wire (253) is greater than the length of the first floating ball wire (32). When the sampling cylinder (11) moves downward in the water, the second float line (253) is used to unwind on the rotating wheel (252) to drive the rotating wheel (252) to overcome the elastic force of the coil spring and rotate along the first direction, thereby driving the screw (24) to move in a direction close to the end plate (112); When the sampling tube (11) moves upward in the water, the coil spring is used to drive the rotating wheel (252) to rotate in a second direction to reel in the second float line (253), thereby driving the screw (24) to move in a direction away from the end plate (112), and the second direction is opposite to the first direction.

4. The groundwater detection and sampling device according to claim 3, wherein, A limit block (242) is provided at one end of the screw rod (24) away from the end plate (112), and at least a portion of the structure of the limit block (242) is in contact with the end surface of the center column (2512) away from the end plate (112).

5. The groundwater detection and sampling device according to claim 1, characterized in that, A guide hole (172) is provided at the center of the mounting frame (17), and the guide hole (172) is coaxially arranged with the sampling main cylinder (111). The intermediate rod (13) passes through the guide hole (172) and fits with the inner wall of the guide hole (172).

6. The groundwater detection and sampling device according to claim 5, characterized in that, A limiting member (132) is provided on the outer side wall of the intermediate rod (13), and the limiting member (132) is located between the mounting frame (17) and the first piston (12). When the limiting member (132) is in contact with the mounting frame (17), the first piston (12) is in a first limit position.

7. The groundwater detection and sampling device according to claim 1, characterized in that, The mounting frame (17) is provided with a threading groove (173), and the inner side wall of the threading groove (173) is provided with a first guide rod (174) and a second guide rod (175), the distance between the first guide rod (174) and the central axis of the sampling main cylinder (111) is greater than the radius of the sampling main cylinder (111), and the distance between the second guide rod (175) and the central axis of the sampling main cylinder (111) is less than the radius of the sampling main cylinder (111), and the elastic rope (16) is supported on the side of the first guide rod (174) away from the end plate (112), and the elastic rope (16) is also supported on the side of the second guide rod (175) away from the end plate (112).

8. The groundwater detection and sampling device according to claim 7, characterized in that, There are multiple elastic ropes (16), and the multiple elastic ropes (16) are evenly distributed along the circumference of the sampling main cylinder (111); the threading groove (173), the first guide rod (174) and the second guide rod (175) are arranged in multiple groups corresponding to the elastic ropes (16).

9. The groundwater detection and sampling device according to claim 1, wherein The outer side wall of the first piston (12) is provided with a first mounting ring groove, in which a first sealing ring is embedded. The first sealing ring is clamped by the inner bottom wall of the first mounting ring groove and the inner side wall of the sampling cavity (115).

10. The groundwater detection and sampling device according to claim 2, characterized in that, The outer side wall of the second piston (18) is provided with a second mounting ring groove, a second sealing ring is embedded in the second mounting ring groove, and the second sealing ring is clamped by the inner bottom wall of the second mounting ring groove and the inner side wall of the sampling cavity (115).

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