Sampling device for loess plateau underground water monitoring

Abstract

The invention relates to the technical field of underground water sampling, in particular to a sampling device for loess plateau underground water monitoring. The existing loess plateau underground water monitoring and sampling device is easy to swing and stir underground water during sampling, and a sampling pipe is easy to damage due to shaking. The cable winding device comprises a winding frame, a composite cable, a connecting frame and the like. A composite cable is wound on a rotating disc of the winding frame, and one end of the composite cable is fixedly connected with a connecting frame. When underground water flows into the sampling pipe, a downward pressing rod frame pushes a sliding column to move downwards and does not block a feeding round opening of a sealing cover any more, at the moment, underground water flows into the sampling pipe from the sealing cover, the downward pressing rod frame moves downwards and drives a rotating seat to move downwards, and when the rotating seat is not blocked by a clamping rod any more, a spring seat resets to drive the rotating seat to move upwards; meanwhile, the clamping rod can drive the rotating seat, the clamping seat and the three sampling pipes to rotate, so that the three sampling pipes alternately rotate and sequentially sample underground water.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater sampling, and particularly to a sampling device for groundwater monitoring in the Loess Plateau. Background Art

[0002] The Loess Plateau is a typical ecologically fragile area and an ecological-climate transition zone in China. In recent years, large-scale vegetation restoration and reconstruction projects have been implemented in the Loess Plateau in order to reasonably and effectively control soil erosion, prevent land desertification and restore the health of the ecosystem. Among them, it is necessary to pre-monitor and sample the groundwater in the Loess Plateau in order to provide strong evidence and support for subsequent projects.

[0003] When the current groundwater sampling device is in use, the sampling cylinder needs to be first placed into a well containing groundwater, and then the groundwater at the bottom of the well is sampled. However, the sediment content of the groundwater in the Loess Plateau is relatively high. During the process of the sampling cylinder penetrating into the groundwater, it is easy to stir up the groundwater, resulting in turbid groundwater and affecting subsequent groundwater sampling. Moreover, the sampling cylinder is prone to shaking during the sampling process, resulting in instability of the sampling cylinder during sampling, and even causing the sampling cylinder to collide with the well wall and break, affecting groundwater sampling. Summary of the Invention

[0004] In view of this, the present invention provides a sampling device for groundwater monitoring in the Loess Plateau, which can limit the sampling pipe through a swing rod, thereby making the sampling pipe more stable during sampling and avoiding stirring up the groundwater.

[0005] The technical implementation solution of the present invention is: a sampling device for groundwater monitoring in the Loess Plateau, including a winding frame, the winding frame includes a base and a turntable rotatably connected to the base, one end of a composite cable is fixedly connected to the turntable of the winding frame, and the composite cable is wound around the turntable of the winding frame. The other end of the composite cable is fixedly connected to a connecting frame, the bottom of the connecting frame is fixedly connected to a fixed seat, the top of the fixed seat is fixedly connected to a driving motor, the output shaft of the driving motor is rotatably connected to the connecting frame, a water intake mechanism is provided on the fixed seat, the water intake mechanism is used for collecting and sampling groundwater, and a switching mechanism is provided on the driving motor, the switching mechanism is used to drive the test tube to rotate, thereby switching the sampled test tube.

[0006] Optionally, the water intake mechanism includes a clamping frame, the clamping frame is rotatably connected to the fixed seat, three sampling pipes are clamped on the clamping frame, a sealing cover is clamped on the top of each sampling pipe, a feeding round opening is opened on the top of each sealing cover, a sliding column is rotatably connected to each sealing cover, the top end of the sliding column is located in the feeding round opening of the sealing cover, and a support spring is connected between the sliding column and the sealing cover.

[0007] Optionally, the switching mechanism includes a reciprocating lead screw fixedly connected to the output shaft of the drive motor. A pressing rod frame is threadedly connected to the reciprocating lead screw. The pressing rod frame is slidably connected to the upper part of the fixed seat. A rotating seat is slidably connected to the clamping frame. The fixed seat is sleeved with the rotating seat. The rotating seat is provided with three arc-shaped inclined surfaces. A spring seat is fixedly connected to the rotating seat. The other end of the spring seat is rotatably connected to the clamping frame. A lower pressing plate frame is fixedly connected to the lower part of the pressing rod frame. The lower pressing plate frame is slidably connected to the fixed seat. A vertical rod is provided on the lower pressing plate frame. A first inclined surface is provided at the bottom of the vertical rod of the lower pressing plate frame. A clamping rod is fixedly connected to the fixed seat. The clamping rod contacts the vertical rod of the lower pressing plate frame and the rotating seat. A second inclined surface is provided at the bottom of the clamping rod.

[0008] Optionally, a fixing mechanism is further included. The fixing mechanism is arranged on the rotating seat and includes a pushing frame. The three pushing frames are all fixedly connected to the rotating seat and are evenly spaced. Each pushing frame is slidably connected to the clamping frame. Three connecting blocks are fixedly connected to the bottom of the clamping frame. A swing rod is rotatably connected to each connecting block. Three sliding plates are slidably connected to the clamping frame. The sliding plates are slidably connected to the swing rods. A transmission spring is connected between the sliding plates and the pushing frames.

[0009] Optionally, a covering mechanism is further included. The covering mechanism is arranged on the fixed seat and includes a rotating plate fixedly connected to the top of the fixed seat. Three sliding frames are slidably connected to the rotating plate. A pulling frame is fixedly connected to the lower end of each sliding frame. The pulling frame is slidably connected to the swing rod. Three contact rods are fixedly connected to the bottom of the rotating plate. Each contact rod is vertically arranged. A cover plate is rotatably connected to the bottom of each sliding frame. The cover plate contacts the bottom end of the contact rod. A torsion spring is connected between the cover plate and the sliding frame.

[0010] Optionally, a counterweight is further included and is fixedly connected to the bottom of the fixed seat.

[0011] Optionally, a filter screen is further included and is fixedly connected to the lower part of the pressing rod frame. The diameter of the filter screen is larger than the diameter of the feeding circular opening of the airtight cover. A shielding seat is fixedly connected to the upper part of the fixed seat. The shielding seat is slidably connected to the pressing rod frame. The filter screen is located within the shielding seat.

[0012] The present invention has the following advantages: 1. In the present invention, the driving motor drives the reciprocating lead screw to rotate, and drives the lower pressing rod frame to move downward. When the lower pressing rod frame moves downward, it will push one of the sliding columns downward. When this sliding column moves downward, it no longer blocks the feeding round opening of one of the sealed covers. At this time, groundwater will flow into the sampling tube from the feeding round opening of one of the sealed covers, and then the groundwater is collected in one of the sampling tubes. While the lower pressing rod frame moves downward, it will drive the lower pressing plate frame to move downward. When the lower pressing plate frame moves downward, it will push the rotating seat downward. When the rotating seat moves downward, it will no longer be blocked by the clamping rod. At this time, the spring seat resets and drives the rotating seat to move upward. At the same time, the second inclined surface of the clamping rod will squeeze the rotating seat to rotate and drive the clamping frame to rotate. The rotation of the clamping frame will drive the three sampling tubes to rotate 120 degrees, so that the three sampling tubes rotate alternately and sample the groundwater in turn.

[0013] 2. In the present invention, when the rotating seat moves downward, it will drive the three pushing frames to move downward. When the pushing frames move downward, they will drive the sliding plate to move downward through the transmission spring. When the sliding plate moves downward, it will push the swing rod to swing outward. The outward swing of the three swing rods will contact the well wall of the groundwater, so as to fix the fixed seat, prevent the three sampling tubes from shifting during the sampling process and disturbing the groundwater, keep the groundwater clear and sample the groundwater better, thereby improving the clarity of the sampled groundwater.

[0014] 3. In the present invention, when the swing rod swings outward, it will drive the pulling frame to swing outward. The swing of the pulling frame will drive the sliding frame and the cover plate to swing together to the side away from the top of the sampling tube. When the cover plate swings to no longer cover the sealed cover, the torsion spring resets and drives the cover plate to rotate 90 degrees. The rotation of the cover plate by 90 degrees will pour out the impurities attached to the surface of the cover plate, prevent the impurities on the surface of the cover plate from falling into the sampling tube, effectively ensure that the groundwater can smoothly enter the sampling tube, and can effectively reduce the impurities in the groundwater in the sampling tube, so as to collect clearer groundwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional structural schematic diagram of the present invention.

[0016] Figure 2 is a first partial three-dimensional structural schematic diagram of the present invention.

[0017] Figure 3 is a second partial three-dimensional structural schematic diagram of the present invention.

[0018] Figure 4 is the present invention Figure 3 is an enlarged three-dimensional structural schematic diagram of A in the present invention.

[0019] Figure 5 is a partial three-dimensional structural schematic diagram of the water intake mechanism, switching mechanism and fixing mechanism of the present invention.

[0020] Figure 6 This is a schematic perspective view of a partial cross-section of the water intake mechanism of the present invention.

[0021] Figure 7 This is a schematic perspective view of a partial disassembled structure of the present invention.

[0022] Figure 8 This is a schematic perspective view of a partial structure of the fixing mechanism and the covering mechanism of the present invention.

[0023] Figure 9 This is a schematic perspective view of the pressing rod frame, the filter screen and the shielding seat of the present invention.

[0024] The meanings of the reference numerals in the figure: 1: winding frame, 2: composite cable, 3: connecting frame, 4: fixing seat, 5: driving motor, 71: clamping frame, 72: sampling tube, 73: sealing cover, 74: sliding column, 75: supporting spring, 81: reciprocating lead screw, 82: pressing rod frame, 83: rotating seat, 84: spring seat, 85: lower pressing plate frame, 86: clamping rod, 91: pushing frame, 92: connecting block, 93: swinging rod, 94: sliding plate, 95: transmission spring, 101: rotating plate, 102: sliding frame, 103: pulling frame, 104: contact rod, 105: cover plate, 106: torsion spring, 11: counterweight, 121: filter screen, 122: shielding seat. Detailed implementation manners

[0025] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Embodiment 1: A sampling device for groundwater monitoring in the Loess Plateau, as Figures 1 - 9 shown, includes a winding frame 1. A base, a turntable are provided on the winding frame 1. The turntable of the winding frame 1 is rotatably connected to the base of the winding frame 1. The [description seems incomplete here, something is missing after 'is fixedly connected to' in the original Chinese] of the winding frame 1 is fixedly connected to the center of the turntable of the winding frame 1. A composite cable 2 is wound on the turntable of the winding frame 1. One end of the composite cable 2 is tied with a connecting frame 3. The bottom of the connecting frame 3 is bolted to a fixing seat 4. The top of the fixing seat 4 is bolted to a driving motor 5. A water intake mechanism is provided on the fixing seat 4. The water intake mechanism is used for collecting and sampling groundwater. A switching mechanism is provided on the driving motor 5. The switching mechanism is used to drive the test tube for sampling to rotate, thereby switching the test tube for sampling.

[0027] The water intake mechanism includes a clamping frame 71, the clamping frame 71 is rotatably connected to the fixed seat 4, three sampling tubes 72 are clamped on the clamping frame 71, a sealing cover 73 is threadedly connected to the top of each sampling tube 72, a feeding round opening is formed at the top of each sealing cover 73, the sealing cover 73 is communicated with the sampling tube 72, a sliding column 74 is rotatably connected to each sealing cover 73, the sliding column 74 exactly blocks the feeding round opening on the sealing cover 73, and a support spring 75 is connected between the sliding column 74 and the sealing cover 73.

[0028] The switching mechanism includes a reciprocating lead screw 81, the reciprocating lead screw 81 is fixedly connected to the output shaft of the driving motor 5, a pressing rod frame 82 is threadedly connected to the reciprocating lead screw 81, the pressing rod frame 82 is slidably connected to the upper part of the fixed seat 4, a rotating seat 83 is rotatably connected to the fixed seat 4, three arc-shaped inclined surfaces are provided on the rotating seat 83, the rotating seat 83 is slidably connected to the clamping frame 71, a spring seat 84 is provided between the rotating seat 83 and the clamping frame 71, two ends of the spring seat 84 are respectively in contact with the rotating seat 83 and the clamping frame 71, a lower pressing plate frame 85 is bolted to the lower part of the pressing rod frame, the lower pressing plate frame 85 is slidably connected to the fixed seat 4, a vertical rod is provided on the lower pressing plate frame 85, a first inclined surface is provided at the bottom of the vertical rod of the lower pressing plate frame 85, a clamping rod 86 is bolted to the fixed seat 4, the clamping rod 86 is in contact with the lower pressing plate frame 85, the clamping rod 86 is also in contact with the rotating seat 83, and a second inclined surface is provided at the bottom of the clamping rod 86.

[0029] In actual operation, the staff first place the take-up rack 1 around the groundwater well, and place the fixing seat 4 into the groundwater well. Then, the staff rotate the turntable of the take-up rack 1 to unwind the composite cable 2. The fixing seat 4 will move downward under the action of gravity to the bottom of the groundwater well. When the fixing seat 4 moves downward to contact the bottom of the groundwater well, the staff start the driving motor 5. The output shaft of the driving motor 5 rotates to drive the reciprocating lead screw 81 to rotate. The rotation of the reciprocating lead screw 81 will first drive the downward pressure rod frame 82 to move downward. The downward movement of the downward pressure rod frame 82 will contact one of the sliding columns 74 and push one of the sliding columns 74 downward. One of the support springs 75 is compressed. One of the sliding columns 74 moves downward and no longer blocks the feeding round opening of one of the sealed covers 73. At this time, groundwater will flow into the sampling tube 72 from the feeding round opening of one of the sealed covers 73, and thus the groundwater is collected in one of the sampling tubes 72. While the downward pressure rod frame 82 moves downward, it will drive the lower pressure plate frame 85 to move downward. The downward movement of the lower pressure plate frame 85 will first contact one of the arc-shaped inclined surfaces of the rotating seat 83, and then push the rotating seat 83 to move downward. The spring seat 84 is compressed. The rotating seat 83 moves downward and will no longer be blocked by the clamping rod 86. At this time, the reset of the spring seat 84 will drive the rotating seat 83 to move upward. At the same time, the second inclined surface of the clamping rod 86 will squeeze one of the arc-shaped inclined surfaces of the rotating seat 83, causing the rotating seat 83 to rotate and drive the clamping frame 71 to rotate. The rotation of the clamping frame 71 will drive the three sampling tubes 72 to rotate 120 degrees. At the same time, the continuous rotation of the reciprocating lead screw 81 will drive the downward pressure rod frame 82 to move upward. The upward movement of the downward pressure rod frame 82 will drive the lower pressure plate frame 85 to move upward together. The upward movement of the lower pressure plate frame 85 will be disengaged from the rotating seat 83. Then, the continuous rotation of the reciprocating lead screw 81 will drive the downward pressure rod frame 82 to move downward again, causing the downward pressure rod frame 82 to push another sliding column 74 downward and open the feeding round opening of another sealed cover 73. By repeating the above operations, the three sampling tubes 72 will rotate alternately and sample the groundwater in sequence.

[0030] Embodiment 2: On the basis of Embodiment 1, as Figures 2 - 8 shown, it further includes a fixing mechanism. The fixing mechanism is provided on the rotating seat 83. The fixing mechanism includes a pushing frame 91. The three pushing frames 91 are connected to the rotating seat 83 by bolts, and the three pushing frames 91 are evenly and equidistantly arranged. Each pushing frame 91 is slidably connected to the clamping frame 71. The bottom of the clamping frame 71 is connected with three connecting blocks 92 by bolts. Each connecting block 92 is rotatably connected with a swing rod 93. Three sliding plates 94 are slidably connected to the clamping frame 71, and the sliding plates 94 are slidably connected with the swing rods 93. A transmission spring 95 is connected between the sliding plates 94 and the pushing frames 91.

[0031] When the rotating seat 83 moves downward, it will drive the three pushing frames 91 to move downward together. When the pushing frame 91 moves downward, it will drive the sliding plate 94 to move downward through the transmission spring 95. When the sliding plate 94 moves downward, it will push the swing rod 93 to swing outward. The three swing rods 93 swinging outward will contact the well wall of the groundwater, thereby fixing the fixed seat 4, preventing the three sampling tubes 72 from shifting during sampling and disturbing the groundwater, so as to keep the groundwater clear and better sample the groundwater. When the rotating seat 83 moves upward, it will drive the three pushing frames 91 to move upward together. When the pushing frame 91 moves upward, it will drive the sliding plate 94 to move upward through the transmission spring 95. When the sliding plate 94 moves upward, it will drive the swing rod 93 to swing inward, facilitating the conversion of the three sampling tubes 72.

[0032] Embodiment 3: On the basis of Embodiment 2, as Figures 2 - 8 shown, it further includes a covering mechanism. The covering mechanism is provided on the fixed seat 4. The covering mechanism includes a rotating plate 101. The rotating plate 101 is connected to the bottom of the fixed seat 4 by bolts. Three sliding frames 102 are slidably connected to the rotating plate 101. A pulling frame 103 is connected to each sliding frame 102 by bolts. The pulling frame 103 is rotatably connected to the swing rod 93. Three contact rods 104 are connected to the bottom of the rotating plate 101 by bolts. The contact rods 104 are vertically arranged. A cover plate 105 is slidably connected to the bottom of each sliding frame 102. The cover plate 105 contacts the bottom end of the contact rod 104. A torsion spring 106 is connected between the cover plate 105 and the sliding frame 102.

[0033] Initially, the torsion spring 106 is twisted, and the cover plate 105 will cover the sampling tube 72 to prevent impurities from falling into the sampling tube 72. When the swing rod 93 swings outward, it will drive the pulling frame 103 to swing outward. The swinging of the pulling frame 103 will drive the sliding frame 102 and the cover plate 105 to swing together to the side away from the top end of the sampling tube 72. When the cover plate 105 swings to no longer cover the sealing cover 73, the reset of the torsion spring 106 will drive the cover plate 105 to rotate 90 degrees. The rotation of the cover plate 105 by 90 degrees will pour out the impurities attached to the surface of the cover plate 105, preventing the impurities on the surface of the cover plate 105 from falling into the sampling tube 72. Then the sampling tube 72 will collect the groundwater sample. When the sampling tube 72 finishes sampling, the inward swing of the swing rod 93 will drive the pulling frame 103 to move in the reverse direction. The reverse movement of the pulling frame 103 will drive the sliding frame 102 and the cover plate 105 to move in the reverse direction together. The reverse movement of the cover plate 105 will cover the sealing cover 73 again, and the torsion spring 106 is twisted, so as to effectively ensure that the groundwater can smoothly enter the sampling tube 72 and can effectively reduce the impurities in the groundwater in the sampling tube 72, so as to collect clearer groundwater.

[0034] Embodiment 4: On the basis of Embodiment 3, as Figures 1 - 9 shown, it further includes a counterweight block 11, and the counterweight block 11 is connected to the bottom of the fixed seat 4 by bolts.

[0035] It further includes a filter screen 121, and the filter screen 121 is connected to the lower part of the lower pressing rod frame 82 by bolts, and the diameter of the filter screen 121 is larger than the diameter of the feeding round opening of the sealing cover 73. A shielding seat 122 is connected to the upper part of the fixed seat 4 by bolts, and the shielding seat 122 is slidably connected to the lower pressing rod frame 82.

[0036] The counterweight block 11 can counterweight the sampling pipe 72, etc., so that the sampling pipe 72, etc. is more stable during the up and down movement, and thus avoid collisions between the sampling pipe 72, etc. and the groundwater well wall during the up and down movement.

[0037] When the lower pressing rod frame 82 moves downward and squeezes the sliding column 74, the filter screen 121 will contact the feeding round opening of the sealing cover 73 and seal the feeding round opening of the sealing cover 73, thereby preventing impurities in the groundwater from entering the sampling pipe 72.

[0038] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sampling device for groundwater monitoring in the Loess Plateau, characterized by: The invention comprises a winding frame (1), wherein the winding frame (1) comprises a base and a turntable rotatably connected to the base, one end of a composite cable (2) is fixedly connected to the turntable of the winding frame (1), and the composite cable (2) is wound on the turntable of the winding frame (1), and the other end of the composite cable (2) is fixedly connected to a connecting frame (3), the bottom of the connecting frame (3) is fixedly connected to a fixing seat (4), the top of the fixing seat (4) is fixedly connected to a driving motor (5), the output shaft of the driving motor (5) is rotatably connected to the connecting frame (3), a water intake mechanism is provided on the fixing seat (4), and the water intake mechanism is used to collect and sample groundwater, and a switching mechanism is provided on the driving motor (5), and the switching mechanism is used to drive a test tube to rotate, thereby switching a test tube for sampling.

2. The sampling device for groundwater monitoring in the Loess Plateau according to claim 1 is characterized in that: The water intake mechanism comprises a bracket (71), the bracket (71) is rotatably connected to the fixed seat (4), three sampling tubes (72) are clamped on the bracket (71), a sealed cover (73) is clamped on the top of each sampling tube (72), a feeding circular opening is opened on the top of each sealed cover (73), a sliding column (74) is rotatably connected to each sealed cover (73), the top of the sliding column (74) is located in the feeding circular opening of the sealed cover (73), and a supporting spring (75) is connected between the sliding column (74) and the sealed cover (73).

3. The sampling device for groundwater monitoring in the Loess Plateau according to claim 2 is characterized in that: The switching mechanism comprises a reciprocating screw rod (81), the reciprocating screw rod (81) is fixedly connected to the output shaft of the driving motor (5), a lower pressure rod frame (82) is connected to the reciprocating screw rod (81) by threading, the lower pressure rod frame (82) is slidably connected to the upper part of the fixed seat (4), a rotating seat (83) is slidably connected to the bracket (71), the fixed seat (4) is sleeved with the rotating seat (83), three arc inclined surfaces are provided on the rotating seat (83), a spring seat (84) is fixedly connected to the rotating seat (83), and the spring seat The other end of the clamping frame (71) is rotatably connected, the lower part of the lower pressure rod frame (82) is fixedly connected with a lower pressure plate frame (85), the lower pressure plate frame (85) is slidably connected with the fixed seat (4), a vertical rod is provided on the lower pressure plate frame (85), the bottom of the vertical rod of the lower pressure plate frame (85) is provided with an inclined surface 1, a clamping rod (86) is fixedly connected to the fixed seat (4), the clamping rod (86) is in contact with the vertical rod of the lower pressure plate frame (85), the clamping rod (86) is in contact with the rotating seat (83), and the bottom of the clamping rod (86) is provided with an inclined surface 2.

4. The sampling device for groundwater monitoring in the Loess Plateau according to claim 3 is characterized in that: The invention also comprises a fixing mechanism, wherein the fixing mechanism is arranged on the rotating seat (83), and the fixing mechanism comprises a pushing frame (91). The three pushing frames (91) are fixedly connected to the rotating seat (83), and the three pushing frames (91) are evenly spaced, and each pushing frame (91) is slidably connected to the card frame (71). The bottom of the card frame (71) is fixedly connected with three connecting blocks (92), and each connecting block (92) is rotatably connected with a swing rod (93). The card frame (71) is slidably connected with three slide plates (94), and the slide plates (94) are slidably connected with the swing rod (93), and a transmission spring (95) is connected between the slide plates (94) and the pushing frame (91).

5. The sampling device for groundwater monitoring in the Loess Plateau according to claim 4 is characterized in that: The invention also comprises a covering mechanism, wherein the covering mechanism is arranged on the fixed seat (4), and the covering mechanism comprises a rotating plate (101), wherein the rotating plate (101) is fixedly connected to the top of the fixed seat (4), and three sliding frames (102) are slidably connected to the rotating plate (101), and each of the sliding frames (102) is fixedly connected to a pulling frame (103) at the lower end, and the pulling frame (103) is slidably connected to the swing rod (93); three contact rods (104) are fixedly connected to the bottom of the rotating plate (101), and each of the contact rods (104) is vertically arranged; and a cover plate (105) is rotatably connected to the bottom of each of the sliding frames (102), and the cover plate (105) contacts the bottom end of the contact rod (104); and a torsion spring (106) is connected between the cover plate (105) and the sliding frame (102).

6. The sampling device for groundwater monitoring in the Loess Plateau according to claim 5 is characterized in that: It also includes a counterweight block (11), which is fixedly connected to the bottom of the fixing seat (4).

7. The sampling device for groundwater monitoring in the Loess Plateau according to claim 6 is characterized in that: It also includes a filter screen (121), the filter screen (121) is fixedly connected to the lower part of the lower pressure rod frame (82), and the diameter of the filter screen (121) is larger than the diameter of the feeding circular opening of the sealing cover (73), and the upper part of the fixed seat (4) is fixedly connected to a shielding seat (122), the shielding seat (122) is slidably connected to the lower pressure rod frame (82), and the filter screen (121) is located in the shielding seat (122).

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