Underground water multi-layer sampling device in soil pollution area based on negative pressure method

Abstract

The invention relates to a soil pollution area underground water multi-layer sampling device based on a negative pressure method, and relates to the technical field of environmental monitoring, the soil pollution area underground water multi-layer sampling device comprises a base fixed on the ground and a sampling rod movably penetrating through the base and inserted into a drill hole, and the lower end of the sampling rod is provided with a notch groove; a plurality of negative pressure sampling barrels distributed at equal intervals in the axial direction of the sampling rod are clamped into the notch groove, a plurality of lifting mechanisms distributed in the axial direction of the sampling rod and used for opening the corresponding negative pressure sampling barrels are arranged in a cavity in the upper end of the sampling rod, and a triggering mechanism used for automatically driving the lifting mechanisms in the descending process of the sampling rod is arranged at the top of the base; a water inlet pipe is arranged at the lower end of the side of the negative-pressure sampling barrel. According to the underground water sampling device, water samples of multiple layers of underground water in a soil polluted area can be collected through the multiple negative pressure sampling barrels, the negative pressure sampling barrels are opened through the lifting mechanism during collection, the sampling efficiency is greatly improved, and the position of the lifting mechanism can be adjusted before sampling so as to adapt to sampling at different depths.

Description

Technical Field

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

[0002] Groundwater sampling in soil contaminated areas is an important part of environmental investigation and pollution assessment, which aims to understand the degree, scope and types of groundwater pollution, 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, to accurately assess the impact of soil pollution on groundwater and to provide a key basis for formulating effective treatment measures, it is necessary to sample multiple layers of groundwater. The negative pressure method uses a vacuum pump or other suction device to generate negative pressure in the sampling tube, so that groundwater flows into the sampling tube under the action of pressure difference. This method can avoid disturbing the groundwater during the sampling process, thereby ensuring the representativeness of the sample.

[0003] However, when existing negative pressure groundwater sampling devices are used to take water samples from different layers, due to the complex groundwater environment, existing devices often find it difficult to accurately determine the depth of the sampling point. Water from other layers may be mixed in due to inaccurate depth control, making the water sample unable to accurately reflect the water quality of the target layer. When using electronic measuring equipment, it may be affected by factors such as groundwater flow and well wall friction, which can easily lead to inaccurate measurement results, easy damage, and high cost. In addition, the negative pressure control of existing negative pressure groundwater sampling devices is relatively complicated. While controlling the descent of the sampling device, the sampling personnel need to control the negative pressure component to take samples, which affects the collection speed of water samples.

[0004] To this end, we provide a multi-layer groundwater sampling device for soil contaminated areas based on the negative pressure method to solve the above-mentioned problems. Summary of the invention

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

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

[0007] A multi-layer groundwater sampling device for soil contaminated areas based on a negative pressure method comprises a base fixed on the ground and a sampling rod movably penetrating the base and inserted into a borehole, a notch groove is provided at the lower end of the sampling rod, a plurality of negative pressure sampling tubes equidistantly distributed along the axial direction of the sampling rod are inserted into the notch groove, a plurality of lifting mechanisms distributed along the axial direction of the sampling rod for opening corresponding negative pressure sampling tubes are provided in a cavity at the upper end of the sampling rod, and a trigger mechanism for automatically driving the lifting mechanism during the descent of the sampling rod is provided on the top of the base.

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

[0009] As a further optimization scheme of the present invention, the negative pressure sampling tube and the sampling rod are spliced ​​into a complete cylinder; the top of the valve is movably provided with an adjusting rod for opening and closing the valve, the top of the adjusting rod is fixed with a fixing block, and a first spring is sleeved on the adjusting rod between the fixing block and the valve.

[0010] As a further optimization scheme of the present invention, a guide roller is provided in the fixed seat, and the end of the pull rope extends to the side of the negative pressure sampling cylinder through the guide roller, and the end of the pull rope is fixedly provided with a frame matching the fixed block; one end of the sliding seat is provided with a rotating frame for driving the winding roller to rotate, and the other end is provided with a fastener for locking the rotation of the winding roller; the pulling mechanism also includes a driving unit located on the side of the sliding seat and used to promote its sliding, and the driving unit includes a first mounting seat fixed on the fixed seat and a first movable rod movably passing through the first mounting seat; the outer end of the first movable rod is fixedly provided with a stop block, and a second spring is sleeved on the first movable rod between the stop block and the first mounting seat, and the inner end of the first movable rod is fixedly connected to the sliding seat.

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

[0012] As a further optimization scheme of the present invention, the trigger mechanism includes a second mounting seat fixed on the top of the base and a second movable rod that movably runs through the second mounting seat; a wheel seat is fixedly provided at the end of the second movable rod close to the sampling rod, a roller matching the first groove is rotatably provided 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 optimization scheme of the present invention, a water inlet hole is provided on the sampling rod at the water inlet pipe, and a filter is provided in the water inlet hole; a clamping block is fixedly provided on the upper end of the side of the negative pressure sampling cylinder, and the clamping block is provided with a threaded hole, and a clamping groove for clamping with the clamping block is provided on the sampling rod at the clamping block, and an installation groove is provided above the clamping groove, and a threaded rod for locking the clamping block is provided in the installation groove.

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

[0015] As a further optimization scheme of the present invention, a slider is fixedly provided on the side of the fixed seat, and a second groove slidably matched with the slider is also 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 hingedly provided at the bottom of the base.

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

[0018] 1. The present invention is provided with a negative pressure sampling tube and a pulling mechanism, so that water samples from multiple layers of groundwater in a soil contaminated area can be collected through multiple negative pressure sampling tubes. When collecting, the negative pressure sampling tube is opened by the pulling mechanism, which is convenient for the sampling personnel to control the sampling of the negative pressure sampling tube on the ground, and the sampling efficiency is greatly improved.

[0019] 2. The present invention arranges a second groove and a slider so that 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, thereby solving the problems of the existing groundwater sampling device that the sampling depth is difficult to control when taking water samples from different layers, the use of sensors has high control costs, and is easy to damage.

[0020] 3. The present invention effectively improves the convenience of controlling the opening and closing of the valve of the negative pressure sampling tube by setting a trigger mechanism. The sampling personnel can operate the lifting equipment in the surrounding safe area. When the sampling rod descends to the sampling position, the valve is automatically opened by the trigger mechanism. The sampling personnel do not need to directly contact the sampling device, thereby avoiding direct contact with the water body and reducing operational risks. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 Schematic diagram of the connection structure between the negative pressure sampling tube and the lifting mechanism of the present invention Figure 1 ;

[0023] Figure 3 Schematic diagram of the connection structure between the negative pressure sampling tube 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 1The present invention provides a multi-layer groundwater sampling device for soil contaminated areas based on the negative pressure method, comprising a sampling rod 1 inserted into a borehole, a notch groove 101 provided at the lower end of the sampling rod 1, a plurality of negative pressure sampling tubes 2 distributed at equal intervals along the axial direction of the sampling rod 1 inserted into the notch groove 101, the negative pressure sampling tubes 2 and the sampling rod 1 are spliced ​​into a complete cylinder, and a plurality of lifting mechanisms 3 for opening the corresponding negative pressure sampling tubes 2 distributed along the axial direction of the sampling rod 1 are provided in the upper end cavity of the sampling rod 1. Water samples of multiple layers of groundwater in soil contaminated areas can be collected through multiple negative pressure sampling tubes 2, and the negative pressure sampling tubes 2 are opened by the lifting mechanism 3 during collection, which is convenient for sampling personnel to control the sampling of the negative pressure sampling tubes 2 on the ground, and the sampling efficiency is greatly improved.

[0033] like Figure 2-Figure 3 , Figure 7 As shown, a water inlet pipe 201 is provided at the lower end of the side of the negative pressure sampling tube 2, a water inlet hole 105 is provided on the sampling rod 1 at the water inlet pipe 201, a filter screen 106 is provided in the water inlet hole 105, the filter screen 106 filters out impurities to avoid clogging 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 fixed at the top of the adjusting rod 203, and a first spring 205 is sleeved on the adjusting rod 203 between the fixing block 204 and the valve 202. The negative pressure sampling tube 2 is a cylinder body that has been pumped with negative pressure, and a vacuum pump or other vacuum equipment is used to pump out the air inside the cylinder body, and a negative pressure environment is formed in the cylinder body before sampling. When the cylinder body is placed in the liquid to be sampled, the liquid will be automatically sucked into the cylinder body due to the pressure difference between the inside and outside of the cylinder, thereby realizing automatic sampling without external force driving.

[0034] like Figure 2-Figure 5As shown, the lifting mechanism 3 includes 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 on the winding roller 303, a guide roller 304 is arranged in the fixed seat 301, the end of the pull rope 305 extends to the side of the negative pressure sampling tube 2 through the guide roller 304, and a frame 306 matching the fixed block 204 is fixedly arranged at the end of the pull rope 305. The lifting mechanism 3 also 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 that movably passes through the first mounting seat 307a; a stop block 307c is fixedly arranged at the outer end of the first movable rod 307b, and a second spring 307d is sleeved on the first movable rod 307b between the stop block 307c and the first mounting seat 307a, and the inner end of the first movable rod 307b is fixedly connected to the sliding seat 302; a first groove 102 is arranged on the upper end surface of the sampling rod 1, and the stop block 307c is located in the first groove 102.

[0035] When the lifting mechanism 3 is used, the sampling personnel applies pressure to the block 307c, and the block 307c drives the first movable rod 307b to move inward. At this time, the second spring 307d is compressed, and 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 pull rope 305 upward, and the pull rope 305 pulls the fixed block 204 upward through the frame 306, and the fixed block 204 drives the adjusting rod 203 to move upward. At this time, the first spring 205 is stretched, and 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 tube 2, the water sample in the borehole is filtered by the filter screen 106 and enters the negative pressure sampling tube 2 from the water inlet pipe 201; when the sampling personnel stop applying pressure to the block 307c, the block 307c is reset under the reset force of the second spring 307d, and the valve 202 is closed under the reset force of the first spring 205, and the water sampling is stopped.

[0036] In order to improve the installation firmness of the negative pressure sampling tube 2, a clamping block 206 is fixedly provided at the upper end of the side of the negative pressure sampling tube 2, and a threaded hole is provided on the clamping block 206. 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, and a mounting groove 108 is provided above the clamping groove 107. A threaded rod for locking the clamping block 206 is provided in the mounting groove 108. When the negative pressure sampling tube 2 is installed, the clamping block 206 is clamped into the clamping groove 107, and the fixing block 204 is clamped into the frame 306 at this time, and then the threaded rod passes through the threaded hole on the clamping block 206, and the clamping block 206 is tightly fixed on the sampling rod 1 to prevent the sampling rod 1 from falling during the lifting process of the negative pressure sampling tube 2.

[0037] Embodiment 2

[0038] On the basis of the first embodiment, in order to improve the convenience of controlling the opening and closing of the valve 202 of the negative pressure sampling tube 2, as Figure 1 , Figure 6 As shown, it also includes a base 4 fixed on the ground, and the sampling rod 1 is movably penetrated on the base 4. The top of the base 4 is provided with a trigger mechanism 5 for automatically driving the lifting mechanism 3 during the descent of the sampling rod 1. When the sampling personnel control the descent of the sampling rod 1 through the hoisting equipment or other lifting equipment, when the trigger mechanism 5 conflicts with 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, and the winding roller 303 pulls the pull rope 305 upward, thereby opening the valve 202 to collect water samples; the sampling personnel can operate the hoisting equipment in the surrounding safe area, and when the sampling rod 1 descends to the sampling position, the valve 202 is automatically opened through the trigger mechanism 5, and the sampling personnel do not need to directly contact the sampling device, thereby 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 that is movable and runs through the second mounting seat 501; a wheel seat 503 is fixedly provided at the end of the second movable rod 502 near the sampling rod 1, and a roller 505 that matches 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, and the third spring 504 is in a compressed state. When in use, the roller 505 contacts the surface of the sampling rod 1, and drives the roller 505 to rotate during the descent of the sampling rod 1. When the sampling rod 1 continues to descend, the roller 505 is immediately stuck in the first groove 102. As the sampling rod 1 continues to descend, when the roller 505 contacts the stop block 307c, the stop block 307c is squeezed inward by the roller 505 under the reset force of the third spring 504, 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, the sampling personnel can more easily grasp the contact situation between the trigger mechanism 5 and the driving unit 307, such as Figure 4 , Figure 7As shown, 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 also includes a first conductive block 307e fixed on the first mounting seat 307a and a second conductive block 307f fixed on the stop block 307c, and the second conductive block 307f contacts the first conductive block 307e to connect the circuit of the indicator light 111. When the stop block 307c is squeezed inward by the roller 505, the stop block 307c drives the second conductive block 307f to move toward the first conductive block 307e, and when the first conductive block 307e contacts the second conductive block 307f, the circuit of the indicator light 111 is connected and emits a bright light, so that the sampling personnel can easily grasp that the trigger mechanism 5 and the driving unit 307 are in contact at this time, and the negative pressure sampling cylinder 2 is sampling water. After the set sampling time, the sampling personnel continue to control the sampling rod 1 to descend by controlling the lifting device.

[0041] In order to facilitate 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 3

[0043] On the basis of the first and second embodiments, in order to improve the practicability of the sampling device and make it convenient to sample groundwater at different depths, Figure 2 , Figure 5 As shown, a slider 301a is fixedly provided on the side of the fixed seat 301, and a second groove 103 slidably matched with the slider 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 slider 301a is provided in the third groove 104; a rotating frame 302a for driving the winding roller 303 to rotate is provided at one end of the sliding seat 302, and a fastener for locking the winding roller 303 to rotate is provided at the other end. Before sampling, the position of the lifting mechanism 3 on the sampling rod 1 is adjusted on the ground to adjust the distance between the lifting mechanism 3 and the corresponding negative pressure sampling tube 2, that is, the sampling depth, so as to facilitate sampling of groundwater at different depths. When adjusting, the fasteners on the side of the winding roller 303 are loosened. At this time, the winding roller 303 can rotate freely in the sliding seat 302, and then the fasteners on the side of the slider 301a are loosened to push the slider 301a to slide along the second groove 103 to the desired position, and then the fasteners on the side of the slider 301a are tightened, and then the winding roller 303 is rotated by the rotating frame 302a to tighten the pull rope 305, thereby completing the adjustment of the position of the lifting mechanism 3 on the sampling rod 1.

[0044] In order to facilitate the adjustment of the position of the lifting mechanism 3 on the sampling rod 1, a plurality of scale lines may be provided on the surface of the sampling rod 1, each scale line corresponding to a negative pressure sampling cylinder 2, and the distance between the negative pressure sampling cylinder 2 and the lifting mechanism 3 may be accurately adjusted through the scale lines.

[0045] The above-mentioned embodiment only expresses one implementation mode of the present invention, and its description is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to 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); a trigger mechanism (5) for automatically driving the lifting mechanism (3) during the descent of the sampling rod (1) is provided on the top of the base (4); 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 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 inside the sliding seat (302), and a pull rope (305) for opening the valve (202) is wound around the winding roller (303).

2. According to claim 1, a multi-layer groundwater sampling device for soil contaminated areas based on negative pressure method is characterized by: The negative pressure sampling tube (2) and the sampling rod (1) are spliced ​​into a complete cylinder; 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 of the adjusting rod (203), and a first spring (205) is sleeved on the adjusting rod (203) between the fixing block (204) and the valve (202).

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); 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 winding roller (303) to rotate; 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) to slide, wherein the driving unit (307) comprises a first mounting seat (307a) fixed on the fixing seat (301) and a first movable rod (307b) movable through the first mounting seat (307a); A stop block (307c) is fixedly provided at the outer end of the first movable rod (307b), a second spring (307d) is sleeved on the first movable rod (307b) between the stop block (307c) and the first mounting seat (307a), and the inner end of the first movable rod (307b) is fixedly connected to the sliding seat (302).

4. The multi-layer groundwater sampling device for soil contaminated areas based on the negative pressure method according to claim 3 is characterized by: 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).

5. The multi-layer groundwater sampling device for soil contaminated areas based on negative pressure method according to claim 4 is characterized by: 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 penetrating 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).

6. 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), and a threaded hole is provided on the clamping block (206). A clamping groove (107) for clamping with the clamping block (206) is provided on the sampling rod (1) at the clamping block (206), and 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).

7. The multi-layer groundwater sampling device for soil contaminated areas based on negative pressure method according to claim 3 is characterized by: A counterweight (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).

8. The multi-layer groundwater sampling device for soil contaminated areas based on negative pressure method according to claim 1 is characterized by: 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).

9. 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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