Underground water pollution concentration detecting and sampling device

Abstract

The invention discloses a groundwater pollution concentration detection sampling device, and relates to the technical field of sampling detection, and the groundwater pollution concentration detection sampling device comprises a steel cable connected with external pay-off equipment; the pressing assembly is fixed to the end, away from the external pay-off equipment, of the steel cable; the outer cylinder is detachably mounted on the lower end face of the pressing assembly; the bottom plate is fixed on the lower end surface of the outer cylinder; the circumference of one end of each hinge rod is hinged to the outer wall of the outer cylinder; a supporting column is fixed to the other end of the hinge rod, and a torsion spring is arranged at the hinged position of the hinge rod and the outer cylinder. The filtering assembly is fixed on the lower end surface of the bottom plate; the plurality of sampling assemblies are arranged, are mounted on the filtering assembly and are positioned in the outer cylinder; according to the invention, the tedious operation of repeatedly lifting equipment or using a plurality of independent samplers is avoided, the sampling efficiency is obviously improved, and the sampling depth error caused by water flow or equipment shaking can be reduced.

Description

Technical Field

[0001] The invention relates to the technical field of sampling detection devices, in particular to a groundwater pollution concentration detection sampling device. Background Art

[0002] Groundwater pollution primarily refers to the deterioration of groundwater quality caused by changes in its chemical composition, physical properties, and biological characteristics due to human activities. Due to the complex strata beneath the Earth's surface and the slow flow of groundwater, groundwater pollution is characterized by slow progress, difficulty in detection, and difficulty in treatment. Once contaminated, even if the source of the pollution is completely eliminated, it takes a long time for the water quality to recover.

[0003] When sampling groundwater at different depths, the existing groundwater sampling device moves the device to the depth to be sampled, and then starts the pump body to extract and sample. However, when sampling deep groundwater, the pipe connected to the pump body is too long, which affects the suction effect. In addition, the distance of the sensor is often insufficient at deep depths, making it difficult to control the sampling device and unable to accurately determine the sampling depth, which affects the sampling detection effect.

[0004] In view of the above problems, the present invention provides a groundwater pollution concentration detection sampling device to solve the above problems. Summary of the Invention

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a groundwater pollution concentration detection and sampling device, comprising: a steel cable connected to an external wire-laying device; a pressing assembly fixed to one end of the steel cable away from the external wire-laying device; an outer cylinder detachably mounted on the lower end face of the pressing assembly; a base plate fixed to the lower end face of the outer cylinder; a hinged rod configured in plurality, one end of which is circumferentially hinged to the outer wall of the outer cylinder; and a support column fixed to the other end, and a torsion spring is provided at the hinge position between the hinged rod and the outer cylinder; a filter assembly fixed to the lower end face of the base plate; a sampling assembly configured in plurality, mounted on the filter assembly, and located inside the outer cylinder.

[0006] Preferably, the pressing assembly includes: a top plate, on the lower end face of which a plurality of fixed disks are fixed, and the plurality of fixed disks correspond one-to-one to the plurality of sampling assemblies; a guide column, which is slidably arranged in the fixed disk and on the outer wall of which a pressing spring is sleeved; and a pressing chamber, which is fixed on the lower end face of the guide column.

[0007] Preferably, the filter assembly includes: a support plate, fixed to the lower end surface of the base plate, and provided with a plurality of placement slots corresponding to the sampling assembly on the support plate; a filter bin, which is hemispherical and fixed to the lower end surface of the support plate, and provided with a plurality of filter holes on the filter bin; a rotating shaft, rotatably arranged at the axial position of the support plate; a connecting shaft, one end of which is fixed in the rotating shaft, and the other end is rotatably arranged in the filter bin; a plurality of water flow blades, which are circumferentially fixed to the outer wall of the rotating shaft; a cleaning rod, which is an arc-shaped rod, fixed to one end of the connecting shaft close to the filter bin, and the cleaning rod has the same curvature as the filter bin, and a plurality of flexible brushes are fixed on the side of the cleaning rod close to the filter bin.

[0008] Preferably, the sampling assembly includes: a sampling cylinder, which is installed in the placement groove and is pressed and fixed by the pressing assembly; at least two limiting assemblies, which are symmetrically installed near the bottom end of the sampling cylinder; a plug, which corresponds one-to-one to the limiting assembly and is sealed in the sampling cylinder; a pressure regulating assembly, which is coaxially fixed in the sampling cylinder; and a piston, which is slidably arranged in the sampling cylinder.

[0009] Preferably, an air pressure chamber is provided inside the sampling tube, the piston seal is slidably arranged in the air pressure chamber, and the top of the air pressure chamber is pressure-regulated by air intake through an air inlet, a valve is installed on the air inlet, and a connecting chamber is provided in the middle ring shape of the inner wall of the sampling tube, the top of the connecting chamber is connected to the air pressure chamber, and the bottom of the connecting chamber is connected to the limit assembly.

[0010] Preferably, the limit assembly includes: a sliding column, which is sealed and slidably arranged in the connecting chamber; an adjusting block, which is threadedly connected in the connecting chamber, and a tension spring is arranged between it and the sliding column, a straight groove is provided at the end of the adjusting block away from the sliding column, and an air hole is provided in the middle position of the adjusting block; a limit block, which is fixed on the end of the sliding column away from the adjusting block, and a guide surface is provided on the limit block.

[0011] Preferably, the pressure regulating assembly includes: a pressure regulating chamber, fixed in the sampling tube; at least two limiting holes, symmetrically opened on the pressure regulating chamber, and corresponding one-to-one to the positions of the limiting blocks; a water inlet, obliquely opened on the outer wall of the pressure regulating chamber; a second plug, sealingly installed at the bottom of the pressure regulating chamber; a pressure regulating column, slidingly arranged in the pressure regulating chamber; a pressure regulating disk, threadedly connected in the pressure regulating chamber, and slidingly connected to the pressure regulating column by a sliding block, and a plurality of through holes are opened on the circumference of the pressure regulating disk; a pressure regulating spring, installed between the pressure regulating disk and the pressure regulating column.

[0012] Preferably, a limiting groove is provided on the side wall of the pressure regulating column, the sliding block is slidably arranged in the sliding groove, a limiting disk is fixed to the position of the pressure regulating column near the limiting hole, an annular limiting groove is provided on the side wall of the limiting disk, a sealing head is fixed on the lower end face of the limiting disk, the sealing head is a conical structure, a cross groove is provided on the bottom thereof, the cross groove corresponds to the plug 2, and a plurality of through holes 1 are provided on the circumference of the limiting disk.

[0013] Compared with the prior art, the present invention provides a groundwater pollution concentration detection sampling device with the following beneficial effects: in the present invention, a plurality of independent sampling components are combined with a pressing component and a pressure regulating component, and different sampling tubes can be triggered sequentially or selectively for sampling after the device is lowered to the target depth once, avoiding the tedious operation of repeatedly lifting the equipment or using multiple independent samplers, significantly improving the sampling efficiency, and before sampling, by injecting different air pressures into the sampling component and jointly adjusting the pressure through the pressure regulating component, automatic sampling is achieved when the sampling depth is reached, avoiding the problem of sensor failure caused by triggering the sensor at a greater depth, and connecting the external wire-laying equipment through a steel cable, combined with the support positioning of the support column on the well wall, ensuring that the device can stably stay at the preset precise depth for sampling, reducing the sampling depth error caused by water flow or equipment shaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic cross-sectional view of the overall structure of the present invention; Figure 3 Schematic diagram of the cross-sectional structure of the filter assembly of the present invention; Figure 4 Schematic diagram of the cross-sectional structure of the sampling assembly of the present invention; Figure 5 for Figure 4 A schematic diagram of the enlarged structure at point A; Figure 6 Schematic diagram of the structure of the voltage regulating assembly in the present invention; Figure 7 Schematic diagram of the structure of the pressure regulating column in the present invention; Figure: 1, steel cable; 2, pressing assembly; 3, outer cylinder; 4, bottom plate; 5, hinged rod; 6, support column; 7, filter assembly; 8, sampling assembly; 21, top plate; 22, fixing plate; 23, guide column; 24, pressing chamber; 71, support plate; 72, filter chamber; 73, placement slot; 74, rotating shaft; 75, connecting shaft; 76, water flow blade; 77, cleaning rod; 81, sampling cylinder; 82, air pressure chamber; 83, connecting chamber; 84, air inlet; 85, plug 1; 86, limit group Parts; 87, pressure regulating assembly; 88, piston; 861, sliding column; 862, adjusting block; 863, limiting block; 871, pressure regulating chamber; 872, limiting hole; 873, water inlet; 874, plug 2; 875, pressure regulating column; 876, pressure regulating plate; 877, through hole 2; 878, sliding block; 879, pressure regulating spring; 8751, sliding groove; 8752, limiting plate; 8753, through hole 1; 8754, limiting groove; 8755, plugging head; 8756, cross slot. DETAILED DESCRIPTION

[0015] Reference Figure 1-Figure 7 The present invention provides a technical solution: a groundwater pollution concentration detection and sampling device, comprising: a steel cable 1, connected to an external wire-laying device; a pressing component 2, fixed at one end of the steel cable 1 away from the external wire-laying device; an outer cylinder 3, detachably mounted on the lower end surface of the pressing component 2; a bottom plate 4, fixed on the lower end surface of the outer cylinder 3; a hinged rod 5, configured as a plurality of, one end of which is circumferentially hinged to the outer wall of the outer cylinder 3; and a support column 6 is fixed at the other end, and a torsion spring is provided at the hinge position between the hinged rod 5 and the outer cylinder 3; a filter component 7, fixed on the lower end surface of the bottom plate 4; a sampling component 8, configured as a plurality of, mounted on the filter component 7, and located inside the outer cylinder 3.

[0016] It should be noted that before sampling, the water pressure at the sampling depth needs to be measured, so that the sampling component 8 can be adaptively adjusted according to the water pressure at different depths, and finally automatic sampling can be completed in place.

[0017] Among them, through multiple independent sampling components 8, after the device is lowered to the target depth once, different sampling components 8 can be triggered sequentially or selectively for sampling, avoiding the tedious operation of repeatedly lifting the equipment or using multiple independent samplers, and significantly improving the sampling efficiency.

[0018] In this embodiment, the pressing assembly 2 includes: a top plate 21, on the lower end face of which are fixed a plurality of fixed disks 22, and the plurality of fixed disks 22 correspond one-to-one to the plurality of sampling assemblies 8; a guide column 23, which is slidably arranged in the fixed disk 22, and on the outer wall of which is sleeved a pressing spring; and a pressing chamber 24, which is fixed on the lower end face of the guide column 23.

[0019] That is, the sampling assembly 8 can be quickly disassembled by the pressing assembly 2, and the sampling assemblies 8 of different heights can be pressed and clamped by the pressing spring of the pressing chamber 24, thereby improving adaptability. In addition, when pressing and clamping the sampling component 8, first lift the pressing component 2 as a whole to separate it from the outer cylinder 3, and then place multiple adjusted sampling components 8 in turn into the upper end surface of the filter component 7, that is, inside the outer cylinder 3, and then install the pressing component 2 on the outer cylinder 3. At this time, multiple pressing chambers 24 need to correspond one-to-one with multiple sampling components 8 to complete the installation of the sampling component 8.

[0020] In this embodiment, the filter assembly 7 includes: a support plate 71, which is fixed to the lower end surface of the base plate 4, and the support plate 71 is provided with a plurality of placement grooves 73 corresponding to the sampling assembly 8; a filter bin 72, which is hemispherical, fixed to the lower end surface of the support plate 71, and the filter bin 72 is provided with a plurality of filter holes; a rotating shaft 74, which is rotatably arranged at the axial position of the support plate 71; a connecting shaft 75, one end of which is fixed in the rotating shaft 74, and the other end is rotatably arranged in the filter bin 72; water flow blades 76, which are configured as a plurality of blades and are circumferentially fixed to the outer wall of the rotating shaft 74; a cleaning rod 77, which is an arc-shaped rod, fixed to one end of the connecting shaft 75 close to the filter bin 72, and the cleaning rod 77 has the same curvature as the filter bin 72, and a plurality of flexible brushes are fixed on the side of the cleaning rod 77 close to the filter bin 72.

[0021] Among them, when the device is descending, the groundwater is filtered through the filter holes of the filter chamber 72. At this time, the water flows into the filter chamber 72 through the filter holes and provides rotational power for the water flow blades 76. At this time, the rotation of the rotating shaft 74 can drive the connecting shaft 75 to rotate, so that the flexible brush on the cleaning rod 77 cleans the filter holes to prevent debris in the groundwater from clogging the filter holes. The rotation of the water flow blades 76 can also drain the water entering the filter chamber 72, so that when the sampling component 8 is not opened, the water in the filter chamber 72 is in a flowing state, avoiding carrying shallow groundwater into the deep layer and affecting the sampling results.

[0022] As a preferred embodiment, the sampling assembly 8 includes: a sampling cylinder 81, which is installed in the placement groove 73 and is pressed and fixed by the pressing assembly 2; at least two limiting assemblies 86, which are symmetrically installed near the bottom end of the inside of the sampling cylinder 81; a plug 85, which corresponds one-to-one to the limiting assembly 86 and is sealed in the sampling cylinder 81; a pressure regulating assembly 87, which is coaxially fixed in the sampling cylinder 81; and a piston 88, which is slidably arranged in the sampling cylinder 81.

[0023] As a preferred embodiment, an air pressure chamber 82 is opened inside the sampling tube 81, the piston 88 is sealingly and slidingly arranged in the air pressure chamber 82, and the top of the air pressure chamber 82 is pressurized by air intake 84, and a valve is installed on the air intake 84. A connecting chamber 83 is opened in the middle ring shape of the inner wall of the sampling tube 81, the top of the connecting chamber 83 is connected to the air pressure chamber 82, and the bottom of the connecting chamber 83 is connected to the limit assembly 86.

[0024] Among them, before using the sampling component 8, the distance from the limit component 86 to the pressure regulating component 87 is facilitated by disassembling the plug 85, so as to adapt to sampling at different depths. Then, the pressure of the pressure regulating component 87 is adjusted, and high-pressure gas is injected into the air inlet 84 through an external pressurizing device, so as to adaptively adjust according to the water pressure of the groundwater at different depths (the water pressure at the sampling depth must be greater than the overall pressure of the pressure regulating component 87 and the air pressure chamber 82). That is to say, the deeper the sampling depth, the higher the water pressure of the groundwater. At this time, the higher the pressure in the air pressure chamber 82, the farther the distance from the limit component 86 to the pressure regulating component 87, thereby ensuring that the water pressure after reaching the sampling depth can enter the air pressure chamber 82 through the pressure regulating component 87. At the same time, the water entering pushes the piston 88 away from the pressure regulating component 87, thereby completing negative pressure extraction, realizing automatic sampling in place, and improving the accuracy of the sampling depth.

[0025] As a preferred embodiment, the limiting assembly 86 includes: a sliding column 861, which is sealed and slidingly arranged in the connecting chamber 83; an adjusting block 862, which is threadedly connected in the connecting chamber 83, and a tension spring is arranged between it and the sliding column 861, and a straight groove is provided at the end of the adjusting block 862 away from the sliding column 861; and an air hole is provided in the middle position of the adjusting block 862.

[0026] The limiting block 863 is fixed to one end of the sliding column 861 away from the adjusting block 862 , and a guide surface is provided on the limiting block 863 .

[0027] Among them, when the piston 88 is pushed away from the pressure regulating assembly 87 by the groundwater, the piston 88 pushes the gas in the air pressure chamber 82 to the connecting chamber 83, so that the gas pushes the sliding column 861. When the piston 88 is located at the top of the air pressure chamber 82, the limit block 863 on the sliding column 861 is inserted into the pressure regulating assembly 87, thereby resetting the pressure regulating assembly 87, closing the pressure regulating assembly 87, and completing the sampling.

[0028] In addition, when adjusting the distance of the limit assembly 86, the slot of the adjustment block 862 is engaged by an external tool, so that the adjustment block 862 is threaded and rotated to complete the adjustment of the distance between the adjustment block 862 and the pressure regulating assembly 87. It should be noted that the sliding column 861 can only slide, and the closer the distance between the adjustment block 862 and the pressure regulating assembly 87 is, the smaller the pressure required to push the sliding column 861 and the limit block 863 (that is, the smaller the force required to stretch the tension spring), thereby completing the automatic limit closure after sampling is completed, thereby improving the sampling accuracy.

[0029] As a preferred embodiment, the pressure regulating assembly 87 includes: a pressure regulating chamber 871, fixed in the sampling tube 81; at least two limiting holes 872, symmetrically opened on the pressure regulating chamber 871, and corresponding one-to-one to the positions of the limiting blocks 863; a water inlet 873, obliquely opened on the outer wall of the pressure regulating chamber 871; a second plug 874, sealingly installed at the bottom of the pressure regulating chamber 871; a pressure regulating column 875, slidingly arranged in the pressure regulating chamber 871; a pressure regulating disk 876, threadedly connected in the pressure regulating chamber 871, and slidingly connected to the pressure regulating column 875 by a sliding block 878, and a plurality of through holes 877 are opened on the circumference of the pressure regulating disk 876; a pressure regulating spring 879, installed between the pressure regulating disk 876 and the pressure regulating column 875.

[0030] As a preferred embodiment, the side wall of the pressure regulating column 875 is provided with a sliding groove 8751, and the sliding block 878 is slidably set in the sliding groove 8751. The pressure regulating column 875 is fixed with a limiting plate 8752 near the limiting hole 872, and the side wall of the limiting plate 8752 is provided with an annular limiting groove 8754. The lower end face of the limiting plate 8752 is fixed with a sealing head 8755. The sealing head 8755 is a conical structure, and a cross groove 8756 is provided at the bottom thereof. The cross groove 8756 corresponds to the plug 2 874, and a plurality of through holes 8753 are provided on the circumference of the limiting plate 8752.

[0031] That is to say, when adjusting the pressure regulating assembly 87 before sampling, first remove the plug 874, and then use an external tool to rotate the cross slot 8756 of the plug 8755, thereby driving the pressure regulating disk 876 to rotate, so that it moves up and down through the threaded connection with the pressure regulating chamber 871, completing the adjustment of the pressure regulating spring 879, and thus adjusting the overall pressure in conjunction with the air pressure in the air pressure chamber 82, adapting to sampling at various depths, and through double pressure regulation, the water pressure at a deeper depth can be adjusted, thereby completing the process of automatic sampling in place.

[0032] It should be noted that when the water pressure of the groundwater pushes the sealing head 8755 to slide open, the bottom height of the limit plate 8752 does not exceed the lowest point of the limit hole 872, preventing groundwater from flowing out through the limit hole 872, and when the piston 88 slides to the top of the air pressure chamber 82, the limit block 863 contacts the limit groove 8754 through the guide surface, thereby pushing the sealing head 8755 to slide down and reset, completing the closure, and preventing groundwater at different depths from mixing, thereby affecting the sampling accuracy.

[0033] Specifically, by using multiple independent sampling components 8 in conjunction with the pressing component 2 and the pressure regulating component 87, different sampling tubes 81 can be triggered sequentially or selectively for sampling after the device is lowered to the target depth once. That is, by adjusting the pressure inside the sampling component 8 to adapt to the groundwater pressure at different depths, selective triggering is performed, avoiding the tedious operation of repeatedly lifting the equipment or using multiple independent samplers, significantly improving the sampling efficiency, and after the sampling is completed, the pressure regulating component 87 can be reset and closed by the limit component 86 to avoid mixing of groundwater at different depths, and before sampling, different air pressures are injected into the sampling component 8 and the pressure regulating component 87 are used to jointly adjust the internal pressure of the sampling component 8, thereby achieving automatic sampling when reaching the sampling depth, avoiding the problem of sensor failure caused by triggering the sensor at a greater depth, and connecting the external wire-laying equipment through the steel cable 1, combined with the support positioning of the support column 6 on the well wall, ensuring that the device can stably stay at the preset precise depth for sampling, reducing the sampling depth error caused by water flow or equipment shaking.

[0034] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A groundwater pollution concentration detection sampling device, characterized in that: include: A steel cable (1) connected to an external pay-out device; A pressing assembly (2) fixed to an end of the steel cable (1) away from an external pay-off device; An outer cylinder (3) is detachably mounted on the lower end surface of the pressing assembly (2); A bottom plate (4) fixed to the lower end surface of the outer cylinder (3); The hinged rod (5) is configured as a plurality of hinged rods, one end of which is circumferentially hinged to the outer wall of the outer cylinder (3); and the other end is fixed with a support column (6), and a torsion spring is provided at the hinged position between the hinged rod (5) and the outer cylinder (3); A filter assembly (7) fixed to the lower end surface of the bottom plate (4); The sampling assembly (8) is configured as a plurality of sampling assemblies, mounted on the filter assembly (7), and located in the outer cylinder (3).

2. A groundwater pollution concentration detection sampling device according to claim 1, characterized in that: The pressing component (2) comprises: A top plate (21) having a plurality of fixed disks (22) fixed on its lower end surface, wherein the plurality of fixed disks (22) correspond one-to-one to the plurality of sampling assemblies (8); A guide column (23) is slidably disposed in the fixed disk (22), and a pressing spring is sleeved on its outer wall; The pressing chamber (24) is fixed to the lower end surface of the guide column (23).

3. A groundwater pollution concentration detection sampling device according to claim 1, characterized in that: The filter assembly (7) comprises: A support plate (71) is fixed to the lower end surface of the base plate (4), and the support plate (71) is provided with a plurality of placement slots (73) corresponding to the sampling components (8); The filter bin (72) is hemispherical and fixed to the lower end surface of the support plate (71), and a plurality of filter holes are provided on the filter bin (72); A rotating shaft (74) is rotatably arranged at the axis center of the support plate (71); A connecting shaft (75), one end of which is fixed in the rotating shaft (74) and the other end of which is rotatably disposed in the filter chamber (72); Water flow blades (76), configured as a plurality of blades, circumferentially fixed to the outer wall of the rotating shaft (74); The cleaning rod (77) is an arc-shaped rod, fixed to one end of the connecting shaft (75) close to the filter bin (72), and the cleaning rod (77) has the same arc as the filter bin (72). A plurality of flexible brushes are fixed to one side of the cleaning rod (77) close to the filter bin (72).

4. A groundwater pollution concentration detection sampling device according to claim 3, characterized in that: The sampling assembly (8) comprises: A sampling cylinder (81) is installed in the placement groove (73) and is pressed and fixed by the pressing assembly (2); At least two limiting assemblies (86) are symmetrically mounted near the bottom end of the sampling cylinder (81); A plug (85) corresponds one-to-one with the limit assembly (86) and is sealed and installed in the sampling tube (81); A pressure regulating assembly (87) is coaxially fixed in the sampling tube (81); The piston (88) is slidably disposed in the sampling cylinder (81).

5. A groundwater pollution concentration detection sampling device according to claim 4, characterized in that: An air pressure chamber (82) is provided inside the sampling tube (81), the piston (88) is sealingly and slidably arranged in the air pressure chamber (82), and the top of the air pressure chamber (82) is air-intaken and pressure-regulated by an air inlet (84), a valve is installed on the air inlet (84), and a connecting chamber (83) is provided in the middle ring shape of the inner wall of the sampling tube (81), the top of the connecting chamber (83) is connected to the air pressure chamber (82), and the bottom of the connecting chamber (83) is connected to the limit assembly (86).

6. A groundwater pollution concentration detection sampling device according to claim 5, characterized in that: The limiting assembly (86) includes: A sliding column (861) is sealingly and slidingly disposed in the communication chamber (83); An adjusting block (862) is threadedly connected to the communicating chamber (83), and a tension spring is provided between the adjusting block (862) and the sliding column (861). A slot is provided at one end of the adjusting block (862) away from the sliding column (861), and an air hole is provided in the middle of the adjusting block (862); The limiting block (863) is fixed to one end of the sliding column (861) away from the adjusting block (862), and a guide surface is provided on the limiting block (863).

7. A groundwater pollution concentration detection sampling device according to claim 6, characterized in that: The pressure regulating assembly (87) comprises: A pressure regulating chamber (871) is fixed in the sampling cylinder (81); There are at least two limiting holes (872), which are symmetrically arranged on the pressure regulating chamber (871) and correspond one-to-one to the positions of the limiting blocks (863); A water inlet (873) is obliquely opened on the outer wall of the pressure regulating chamber (871); A second plug (874) is sealingly mounted on the bottom of the pressure regulating chamber (871); A pressure regulating column (875) is slidably disposed in the pressure regulating chamber (871); A pressure regulating disc (876) is threadedly connected to the pressure regulating chamber (871) and is slidably connected to the pressure regulating column (875) by a sliding block (878), and a plurality of through holes (877) are formed on the circumference of the pressure regulating disc (876); A pressure regulating spring (879) is installed between the pressure regulating disk (876) and the pressure regulating column (875).

8. A groundwater pollution concentration detection sampling device according to claim 7, characterized in that: The side wall of the pressure regulating column (875) is provided with a sliding groove (8751), and the sliding block (878) is slidably arranged in the sliding groove (8751). A limiting plate (8752) is fixed to the position of the pressure regulating column (875) near the limiting hole (872), and an annular limiting groove (8754) is provided on the side wall of the limiting plate (8752). A sealing head (8755) is fixed to the lower end face of the limiting plate (8752). The sealing head (8755) is a conical structure, and a cross groove (8756) is provided at the bottom thereof. The cross groove (8756) corresponds to the second plug (874), and a plurality of through holes (8753) are provided on the circumference of the limiting plate (8752).

Images