A multi-layer groundwater sampling device for soil pollution areas based on the negative pressure method

Abstract

The present invention relates to a multi-layer groundwater sampling device for soil pollution areas based on the negative pressure method, belonging to the technical field of environmental monitoring. It includes a base fixed on the ground and a sampling rod that movably penetrates through the base and is inserted into a borehole. A notch groove is provided at the lower end of the sampling rod, and a plurality of negative pressure sampling cylinders evenly distributed at equal intervals along the axial direction of the sampling rod are clamped in the notch groove. A plurality of lifting mechanisms for opening the corresponding negative pressure sampling cylinders are provided in the upper cavity of the sampling rod along the axial direction of the sampling rod. A trigger mechanism for automatically driving the lifting mechanism during the descent of the sampling rod is provided at the top of the base; a water inlet pipe is provided at the lower end of the side surface of the negative pressure sampling cylinder. This groundwater sampling device can collect water samples from multiple layers of groundwater in soil pollution areas through a plurality of negative pressure sampling cylinders, and the negative pressure sampling cylinders are opened by the lifting mechanism during collection, greatly improving the sampling efficiency. The position of the lifting mechanism can be adjusted before sampling to adapt to sampling at different depths.

Description

Technical Field

[0001] The present invention belongs to the technical field of environmental monitoring, and specifically relates to a multi-layer groundwater sampling device for soil pollution areas based on the negative pressure method. Background Art

[0002] Groundwater sampling in soil pollution areas is an important link in environmental investigation and pollution assessment, aiming to understand the degree, scope and types of pollutants in groundwater, and provide a scientific basis for soil and groundwater pollution assessment and ecological restoration. In order to more comprehensively understand the distribution of pollution in groundwater layers at different depths, and to provide a key basis for accurately evaluating the impact of soil pollution on groundwater and formulating effective treatment measures, it is necessary to sample groundwater at multiple layers. The negative pressure method uses a vacuum pump or other air extraction device to generate negative pressure in the sampling pipe, so that groundwater flows into the sampling pipe under the action of the pressure difference. This method can avoid disturbing the groundwater during the sampling process, thus ensuring the representativeness of the sample.

[0003] However, when the existing negative pressure method groundwater sampling device takes water samples from different layers, due to the complex groundwater environment, it is often difficult for the existing device to accurately determine the depth of the sampling point, and water from other layers may be mixed in due to inaccurate depth control, resulting in the water sample not being able to accurately reflect the water quality of the target layer. When using electronic measurement equipment, it may be affected by factors such as underground water flow and wellbore friction, easily leading to inaccurate measurement results, being prone to damage, and having a high cost; moreover, the negative pressure control of the existing negative pressure method groundwater sampling device is relatively complex. When the sampling personnel control the descent of the sampling device, they need to control the negative pressure component for sampling, which affects the sampling speed of the water sample.

[0004] Therefore, we provide a multi-layer groundwater sampling device for soil pollution areas based on the negative pressure method to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-layer groundwater sampling device for soil pollution areas based on the negative pressure method in view of the problems in the background art.

[0006] The present invention achieves the above purpose through the following technical solutions:

[0007] A multi-layer groundwater sampling device for soil pollution areas based on the negative pressure method includes a base fixed on the ground and a sampling rod that movably penetrates through the base and inserts into a drill hole. A notch groove is provided at the lower end of the sampling rod, and a plurality of negative pressure sampling cylinders are clamped in the notch groove and are equally spaced along the axial direction of the sampling rod. A plurality of lifting mechanisms for opening the corresponding negative pressure sampling cylinders are provided in the upper cavity of the sampling rod along the axial direction of the sampling rod, and a triggering mechanism for automatically driving the lifting mechanism during the descent of the sampling rod is provided at the top of the base.

[0008] The lower end of the side of the negative pressure sampling cylinder is provided with a water inlet pipe, and a valve is provided at the end of the water inlet pipe; the lifting mechanism includes a fixed seat and a sliding seat slidably arranged on the top of the fixed seat. A winding roller is rotatably arranged in the sliding seat, and a pulling rope for opening the valve is wound around the winding roller.

[0009] As a further optimized solution of the present invention, the negative pressure sampling cylinder and the sampling rod are spliced into a complete cylinder; a regulating rod for opening and closing the valve is movably arranged on the top of the valve. A fixed block is fixedly arranged at the top end of the regulating rod, and a first spring is sleeved on the regulating rod between the fixed block and the valve.

[0010] As a further optimized solution of the present invention, a guide roller is arranged in the fixed seat. The end of the pulling rope extends to the side of the negative pressure sampling cylinder through the guide roller, and a frame body matching the fixed block is fixedly arranged at the end of the pulling rope; a rotating frame for driving the winding roller to rotate is arranged at one end of the sliding seat, and a fastening member for locking the rotation of the winding roller is arranged at the other end; the lifting mechanism further includes a driving unit located on the side of the sliding seat and used for pushing it to slide. The driving unit includes a first mounting seat fixed on the fixed seat and a first movable rod movably penetrating through the first mounting seat; a resisting block is fixedly arranged at the outer end of the first movable rod, a second spring is sleeved on the first movable rod between the resisting block and the first mounting seat, and the inner end of the first movable rod is fixedly connected with the sliding seat.

[0011] As a further optimized solution of the present invention, a first groove is arranged on the upper end surface of the sampling rod, and the resisting block is located in the first groove.

[0012] As a further optimized solution of the present invention, the triggering mechanism includes a second mounting seat fixed on the top of the base and a second movable rod movably penetrating through the second mounting seat; a wheel seat is fixedly arranged at the end of the second movable rod close to the sampling rod. A roller matching the first groove is rotatably arranged in the wheel seat, and a third spring is sleeved on the second movable rod between the wheel seat and the second mounting seat.

[0013] As a further optimized solution of the present invention, a water inlet hole is arranged on the sampling rod at the water inlet pipe, and a filter screen is arranged in the water inlet hole; a clamping block is fixedly arranged on the upper end of the side of the negative pressure sampling cylinder. A threaded hole is arranged on the clamping block, a clamping groove clamped and matched with the clamping block is arranged on the sampling rod at the clamping block, a mounting groove is arranged above the clamping groove, and a threaded rod for locking the clamping block is arranged in the mounting groove.

[0014] As a further optimization solution of the present invention, a counterweight is provided at the bottom of the sampling rod, and a lifting ring and an indicator light are respectively provided at the top of the sampling rod; the driving unit further includes a first conductive block fixed on the first mounting seat and a second conductive block fixed on the abutting block, and the second conductive block contacts the first conductive block to connect the circuit of the indicator light.

[0015] As a further optimization solution of the present invention, a slider is fixedly provided on the side surface of the fixed seat, and a second groove slidably matched with the slider is further provided on the upper end surface of the sampling rod. A third groove is provided on the side of the second groove, and a fastener for locking the slider is provided in the third groove.

[0016] As a further optimization solution of the present invention, three ground plugs distributed in an equilateral triangle are hinged at the bottom of the base.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. By providing a negative pressure sampling cylinder and a lifting mechanism, the present invention can collect water samples at multiple levels of groundwater in the soil pollution area through multiple negative pressure sampling cylinders, and when collecting, the negative pressure sampling cylinder is opened through the lifting mechanism, which is convenient for the sampling personnel to control the sampling of the negative pressure sampling cylinder on the ground, and the sampling efficiency is greatly improved.

[0019] 2. By providing a second groove and a slider, the position of the lifting mechanism on the sampling rod can be freely adjusted, which is convenient for sampling groundwater at different depths. Before sampling, the position of the lifting mechanism can be adjusted on the ground based on the sampling depth, solving the problem that it is difficult to conveniently control the sampling depth when the existing groundwater sampling device takes water samples at different levels, the cost of using sensors for control is relatively high, and it is easy to be damaged.

[0020] 3. By providing a triggering mechanism, the convenience of controlling the opening and closing of the valve of the negative pressure sampling cylinder is effectively improved. The sampling personnel can operate the hoisting equipment in the surrounding safe area. When the sampling rod descends to the sampling position, the valve is automatically opened through the triggering mechanism, without the sampling personnel directly contacting the sampling device, thereby avoiding direct contact with the water body and reducing the operation risk. Description of the Drawings

[0021] Figure 1 is a three-dimensional schematic diagram of the overall structure of the present invention;

[0022] Figure 2 is a schematic diagram of the connection structure between the negative pressure sampling cylinder and the lifting mechanism of the present invention Figure 1 ;

[0023] Figure 3 is a schematic diagram of the connection structure between the negative pressure sampling cylinder and the lifting mechanism of the present invention Figure 2 ;

[0024] Figure 4 For the present invention Figure 3 A schematic diagram of the structure enlargement in the middle;

[0025] Figure 5 A top cross-sectional view of the upper end structure of the sampling rod of the present invention;

[0026] Figure 6 It is a schematic diagram of the base and trigger mechanism structure of the present invention;

[0027] Figure 7 It is a schematic diagram of the sampling rod structure of the present invention.

[0028] In the figure:

[0029] 1. Sampling rod; 101. Notch groove; 102. First groove; 103. Second groove; 104. Third groove; 105. Water inlet hole; 106. Filter screen; 107. Slot; 108. Mounting groove; 109. Counterweight; 110. Lifting ring; 111. Indicator light; 2. Negative pressure sampling tube; 201. Water inlet pipe; 202. Valve; 203. Adjusting rod; 204. Fixing block; 205. First spring; 206. Slot; 3. Lifting mechanism; 301. Fixing seat; 301a. Sliding block; 302 , sliding seat; 302a, rotating frame; 303, winding roller; 304, guide roller; 305, pull rope; 306, frame; 307, driving unit; 307a, first mounting seat; 307b, first movable rod; 307c, stop block; 307d, second spring; 307e, first conductive block; 307f, second conductive block; 4, base; 401, ground plug; 5, trigger mechanism; 501, second mounting seat; 502, second movable rod; 503, wheel seat; 504, third spring; 505, roller. DETAILED DESCRIPTION

[0030] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0031] Embodiment 1

[0032] In order to solve the problem that the sampling depth of existing groundwater sampling devices is difficult to control when sampling water from different layers, the cost of using sensors for control is high, and they are easy to damage, please refer to Figure 1, a multi-layer groundwater sampling device for soil pollution areas based on the negative pressure method provided by the present invention includes a sampling rod 1 inserted into a borehole. A notch groove 101 is provided at the lower end of the sampling rod 1, and a plurality of negative pressure sampling cylinders 2 evenly distributed at equal intervals along the axial direction of the sampling rod 1 are clamped in the notch groove 101. The negative pressure sampling cylinder 2 and the sampling rod 1 are spliced into a complete cylinder. A plurality of lifting mechanisms 3 for opening the corresponding negative pressure sampling cylinder 2 are provided in the upper cavity of the sampling rod 1 along the axial direction of the sampling rod 1. It can collect water samples from multiple layers of groundwater in soil pollution areas through a plurality of negative pressure sampling cylinders 2, and when collecting, the negative pressure sampling cylinder 2 is opened by the lifting mechanism 3, which is convenient for sampling personnel to control the sampling of the negative pressure sampling cylinder 2 on the ground, and the sampling efficiency is greatly improved.

[0033] As Figures 2 - 3 , Figure 7 shown, a water inlet pipe 201 is provided at the lower end of the side surface of the negative pressure sampling cylinder 2. An inlet water hole 105 is provided on the sampling rod 1 at the position of the water inlet pipe 201. A filter screen 106 is provided in the inlet water hole 105. The filter screen 106 filters out impurities to avoid blocking of the water inlet pipe 201 and ensure the purity of the water sample. A valve 202 is provided at the end of the water inlet pipe 201. An adjusting rod 203 for opening and closing the valve 202 is movably provided at the top of the valve 202. A fixing block 204 is fixedly provided at the top end of the adjusting rod 203. A first spring 205 is sleeved on the adjusting rod 203 between the fixing block 204 and the valve 202. The negative pressure sampling cylinder 2 is a cylinder with negative pressure already pumped. The air inside the cylinder is pumped away by a vacuum pump or other vacuum equipment to form a negative pressure environment inside the cylinder in advance before sampling. When the cylinder is placed in the liquid to be sampled, due to the pressure difference inside and outside the cylinder, the liquid will be automatically sucked into the cylinder, thus realizing automatic sampling without external force drive.

[0034] As Figures 2 - 5As shown in the figure, the lifting mechanism 3 includes a fixed seat 301 and a sliding seat 302 slidably disposed on the top of the fixed seat 301. A winding roller 303 is rotatably disposed in the sliding seat 302. A pulling rope 305 for opening the valve 202 is wound around the winding roller 303. A guide roller 304 is disposed in the fixed seat 301. The end of the pulling rope 305 extends to the side of the negative pressure sampling cylinder 2 through the guide roller 304, and a frame body 306 matching the fixed block 204 is fixedly disposed at the end of the pulling rope 305. The lifting mechanism 3 further includes a driving unit 307 located on the side of the sliding seat 302 and used to push it to slide. The driving unit 307 includes a first mounting seat 307a fixed on the fixed seat 301 and a first movable rod 307b movably penetrating through the first mounting seat 307a. An abutting block 307c is fixedly disposed at the outer end of the first movable rod 307b. A second spring 307d is sleeved on the first movable rod 307b between the abutting block 307c and the first mounting seat 307a. The inner end of the first movable rod 307b is fixedly connected to the sliding seat 302. A first groove 102 is provided on the upper end surface of the sampling rod 1, and the abutting block 307c is located in the first groove 102.

[0035] When the lifting mechanism 3 is specifically used, the sampling personnel apply pressure to the abutting block 307c. The abutting block 307c drives the first movable rod 307b to move inward. At this time, the second spring 307d is compressed. The first movable rod 307b drives the sliding seat 302 to move horizontally along the fixed seat 301. The sliding seat 302 drives the winding roller 303 therein to move horizontally. The winding roller 303 pulls the pulling rope 305 upward. The pulling rope 305 pulls the fixed block 204 upward through the frame body 306. The fixed block 204 drives the adjusting rod 203 to move upward. At this time, the first spring 205 is stretched. The adjusting rod 203 drives the valve core in the valve 202 to move, thereby opening the valve 202. Under the negative pressure of the negative pressure sampling cylinder 2, the water sample in the drilling hole is filtered by the filter screen 106 and enters the negative pressure sampling cylinder 2 from the water inlet pipe 201. When the sampling personnel stop applying pressure to the abutting block 307c, under the restoring force of the second spring 307d, the abutting block 307c resets. Under the restoring force of the first spring 205, the valve 202 closes and stops collecting the water sample.

[0036] In order to improve the installation firmness of the negative pressure sampling cylinder 2, a clamping block 206 is fixedly disposed at the upper end of the side of the negative pressure sampling cylinder 2. A threaded hole is provided on the clamping block 206. A clamping groove 107 that is clamped and matched with the clamping block 206 is provided on the sampling rod 1 at the position of the clamping block 206. An installation groove 108 is provided above the clamping groove 107. A threaded rod for locking the clamping block 206 is disposed in the installation groove 108. When the negative pressure sampling cylinder 2 is installed, the clamping block 206 is snapped into the clamping groove 107. At this time, the fixed block 204 is snapped into the frame body 306. Then, the threaded rod passes through the threaded hole on the clamping block 206 to tightly fix the clamping block 206 on the sampling rod 1, avoiding the negative pressure sampling cylinder 2 from falling during the lifting and lowering process of the sampling rod 1.

[0037] Embodiment 2

[0038] On the basis of Embodiment 1, in order to improve the convenience of controlling the opening and closing of the valve 202 of the negative pressure sampling cylinder 2, as Figure 1 、 Figure 6 shown, it further includes a base 4 fixed on the ground. The sampling rod 1 movably penetrates through the base 4, and a trigger mechanism 5 for automatically driving the lifting mechanism 3 during the descent of the sampling rod 1 is provided at the top of the base 4. When the sampling personnel control the descent of the sampling rod 1 through a hoisting device or other lifting equipment, when the trigger mechanism 5 abuts against the lifting mechanism 3, the trigger mechanism 5 drives the driving unit 307 of the lifting mechanism 3 to move horizontally. The driving unit 307 drives the sliding seat 302 to move horizontally. The sliding seat 302 drives the winding roller 303 therein to move horizontally. The winding roller 303 pulls up the pulling rope 305, thereby opening the valve 202 to collect the water sample. The sampling personnel can operate the hoisting device in the surrounding safe area. When the sampling rod 1 descends to the sampling position, the valve 202 is automatically opened through the trigger mechanism 5, without the sampling personnel directly contacting the sampling device, thus avoiding direct contact with the water body and reducing the operation risk.

[0039] The trigger mechanism 5 includes a second mounting seat 501 fixed on the top of the base 4 and a second movable rod 502 movably penetrating through the second mounting seat 501. A wheel seat 503 is fixedly provided at the end of the second movable rod 502 close to the sampling rod 1. A roller 505 matching the first groove 102 is rotatably provided in the wheel seat 503. A third spring 504 is sleeved on the second movable rod 502 between the wheel seat 503 and the second mounting seat 501, and the third spring 504 is in a compressed state. During use, the roller 505 abuts against the surface of the sampling rod 1. During the descent of the sampling rod 1, the roller 505 is driven to rotate. When the sampling rod 1 continues to descend, the roller 505 is immediately caught in the first groove 102. As the sampling rod 1 continues to descend, when the roller 505 contacts the abutting block 307c, under the restoring force of the third spring 504, the abutting block 307c is squeezed inward by the roller 505, thereby driving the sliding seat 302 to move along the fixed seat 301.

[0040] In order to improve the intuitiveness of the trigger mechanism 5, so that the sampling personnel can more conveniently master the contact situation between the trigger mechanism 5 and the driving unit 307, as Figure 4 、 Figure 7As shown, a counterweight 109 is provided at the bottom of the sampling rod 1, and a lifting ring 110 and an indicator light 111 are respectively provided at the top of the sampling rod 1; the driving unit 307 further includes a first conductive block 307e fixed on the first mounting seat 307a and a second conductive block 307f fixed on the abutting block 307c. The second conductive block 307f contacts the first conductive block 307e to connect the circuit of the indicator light 111. When the abutting block 307c is pushed inward by the roller 505 and moves, the abutting block 307c drives the second conductive block 307f to move towards the first conductive block 307e. When the first conductive block 307e contacts the second conductive block 307f, the circuit of the indicator light 111 is connected and emits light, so as to facilitate the sampling personnel to know that the triggering mechanism 5 and the driving unit 307 are in contact at this time, and the negative pressure sampling cylinder 2 is taking water samples. After the set sampling time has passed, at this time, the sampling personnel control the lifting device to continue to control the sampling rod 1 to descend.

[0041] In order to facilitate the fixing of the base 4, three ground plugs 401 distributed in an equilateral triangle are hingedly provided at the bottom of the base 4.

[0042] Embodiment III

[0043] On the basis of Embodiment I and Embodiment II, in order to improve the practicability of the sampling device and facilitate sampling of groundwater at different depths, as Figure 2 、 Figure 5 shown, a slider 301a is fixedly provided on the side surface of the fixing seat 301, and a second groove 103 slidably matched with the slider 301a is further provided on the upper end surface of the sampling rod 1. A third groove 104 is provided on the side of the second groove 103, and a fastener for locking the slider 301a is provided in the third groove 104; one end of the sliding seat 302 is provided with a rotating frame 302a for driving the winding roller 303 to rotate, and the other end is provided with a fastener for locking the rotation of the winding roller 303. Before sampling, by adjusting the position of the lifting mechanism 3 on the sampling rod 1 on the ground, the distance between the lifting mechanism 3 and the corresponding negative pressure sampling cylinder 2, that is, the sampling depth, can be adjusted to facilitate sampling of groundwater at different depths. During adjustment, loosen the fastener on the side of the winding roller 303. At this time, the winding roller 303 can rotate freely in the sliding seat 302. Then loosen the fastener on the side of the slider 301a, push the slider 301a to slide along the second groove 103 to the required position, then tighten the fastener on the side of the slider 301a, and then rotate the winding roller 303 through the rotating frame 302a to tighten the pulling rope 305, that is, the adjustment of the position of the lifting mechanism 3 on the sampling rod 1 is completed.

[0044] In order to more conveniently adjust the position of the lifting mechanism 3 on the sampling rod 1, multiple scale lines can be provided on the surface of the sampling rod 1. Each scale line corresponds to a negative pressure sampling cylinder 2, and the distance between the negative pressure sampling cylinder 2 and the lifting mechanism 3 can be accurately adjusted through the scale lines.

[0045] The above-described embodiments merely represent one implementation mode of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent for 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 fall within the protection scope of the present invention.

Claims

1. A multi-layer groundwater sampling device for soil contaminated areas based on a negative pressure method, comprising a base (4) fixed to the ground and a sampling rod (1) movably penetrating the base (4) and inserted into a borehole, characterized in that: The lower end of the sampling rod (1) is provided with a notch groove (101), and a plurality of negative pressure sampling tubes (2) distributed along the axial direction of the sampling rod (1) are inserted into the notch groove (101). A plurality of lifting mechanisms (3) distributed along the axial direction of the sampling rod (1) and used to open corresponding negative pressure sampling tubes (2) are provided in the upper end cavity of the sampling rod (1), and a trigger mechanism (5) is provided on the top of the base (4) for automatically driving the lifting mechanism (3) during the descent of the sampling rod (1); A water inlet pipe (201) is provided at the lower end of the side of the negative pressure sampling tube (2), and a valve (202) is provided at the end of the water inlet pipe (201). The negative pressure sampling tube (2) and the sampling rod (1) are spliced ​​into a complete cylinder; The lifting mechanism (3) comprises a fixed seat (301) and a sliding seat (302) slidably arranged on the top of the fixed seat (301); a winding roller (303) is rotatably arranged in the sliding seat (302); a pull rope (305) for opening the valve (202) is wound around the winding roller (303); a rotating frame (302a) for driving the winding roller (303) to rotate is arranged at one end of the sliding seat (302); and a fastener for locking the winding roller (303) to rotate is arranged at the other end; The lifting mechanism (3) further comprises a driving unit (307) located on the side of the sliding seat (302) and used to push the sliding seat (302), the driving unit (307) comprising a first mounting seat (307a) fixed on the fixing seat (301) and a first movable rod (307b) movably penetrating the first mounting seat (307a), a stop block (307c) being fixedly provided at the outer end of the first movable rod (307b), a second spring (307d) being sleeved on the first movable rod (307b) between the stop block (307c) and the first mounting seat (307a), and an inner end of the first movable rod (307b) being fixedly connected to the sliding seat (302); A first groove (102) is provided on the upper end surface of the sampling rod (1), and the stop block (307c) is located in the first groove (102); The trigger mechanism (5) comprises a second mounting seat (501) fixed on the top of the base (4) and a second movable rod (502) movably extending through the second mounting seat (501); a wheel seat (503) is fixedly provided at the end of the second movable rod (502) close to the sampling rod (1); a roller (505) matching the first groove (102) is rotatably provided in the wheel seat (503); and a third spring (504) is sleeved on the second movable rod (502) between the wheel seat (503) and the second mounting seat (501); A sliding block (301a) is fixedly provided on the side surface of the fixing seat (301), and a second groove (103) slidably matched with the sliding block (301a) is also provided on the upper end surface of the sampling rod (1), and a third groove (104) is provided on the side of the second groove (103), and a fastener for locking the sliding block (301a) is provided in the third groove (104).

2. According to claim 1, a multi-layer groundwater sampling device for soil contaminated areas based on negative pressure method is characterized by: The top of the valve (202) is movably provided with an adjusting rod (203) for opening and closing the valve (202), the top of the adjusting rod (203) is fixedly provided with a fixing block (204), and the adjusting rod (203) between the fixing block (204) and the valve (202) is sleeved with a first spring (205).

3. The multi-layer groundwater sampling device for soil contaminated areas based on negative pressure method according to claim 2 is characterized by: A guide roller (304) is provided in the fixing seat (301), and the end of the pull rope (305) extends to the side of the negative pressure sampling cylinder (2) through the guide roller (304), and a frame (306) matching the fixing block (204) is fixedly provided at the end of the pull rope (305).

4. The multi-layer groundwater sampling device for soil contaminated areas based on negative pressure method according to claim 1 is characterized by: A water inlet hole (105) is provided on the sampling rod (1) at the water inlet pipe (201), and a filter screen (106) is provided in the water inlet hole (105); A clamping block (206) is fixedly provided at the upper end of the side surface of the negative pressure sampling cylinder (2), the clamping block (206) being provided with a threaded hole, a clamping groove (107) for clamping and cooperating with the clamping block (206) is provided on the sampling rod (1) at the clamping block (206), a mounting groove (108) is provided above the clamping groove (107), and a threaded rod for locking the clamping block (206) is provided in the mounting groove (108).

5. The multi-layer groundwater sampling device for soil contaminated areas based on negative pressure method according to claim 1 is characterized by: A counterweight block (109) is provided at the bottom of the sampling rod (1), and a hanging ring (110) and an indicator light (111) are provided at the top of the sampling rod (1); The driving unit (307) further comprises a first conductive block (307e) fixed on the first mounting seat (307a) and a second conductive block (307f) fixed on the stop block (307c), wherein the second conductive block (307f) contacts the first conductive block (307e) to connect the circuit of the indicator light (111).

6. The multi-layer groundwater sampling device for soil contaminated areas based on negative pressure method according to claim 1 is characterized by: The bottom of the base (4) is hingedly provided with three ground plugs (401) distributed in an equilateral triangle.

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