Underground water pollutant detection device and detection method

Abstract

The invention relates to the technical field of underground water detection, in particular to an underground water pollutant detection device and a detection method. The structure layout is more reasonable, interference to a water sample of a water taking layer caused by falling of upper-layer soil is effectively prevented, and the underground water pollutant detection precision is improved; comprising a machine frame, a sliding base installed on the machine frame in an up-down sliding mode, a discharging barrel piece fixedly installed at the bottom of the sliding base, a wall protecting barrel detachably connected with the discharging barrel piece, a rotating shaft rotationally installed on the sliding base, and a rotating driver providing power for rotation of the rotating shaft. The water sample detection assembly is installed on the upper portion of the wall protecting cylinder, the isolation soil shoveling assembly is installed at the bottom of the rotating shaft, spiral conveying blades matched with the inner walls of the wall protecting cylinder and the discharging cylinder piece are arranged on the rotating shaft, and the water sample detection assembly is used for detecting an underground water sample; the isolation soil shoveling assembly comprises a piston matched with the inner wall of the wall protecting cylinder and the inner wall of the discharging cylinder part, and a plurality of penetrating openings evenly distributed in the circumferential direction are formed in the piston.

Description

Technical Field

[0001] The present invention relates to the technical field of groundwater detection, and in particular to a groundwater pollutant detection device and a detection method. Background Art

[0002] As we all know, groundwater quality testing is an important part of ensuring the safety and rational use of water resources, involving a series of measurements and analyses of the physical, chemical and biological properties of groundwater. Among them, the more important are organic pollution indicators and heavy metal pollution indicators. Organic pollution indicators include polycyclic aromatic hydrocarbons, pesticides, petroleum, volatile organic compounds, etc. These indicators can reflect the types and concentrations of organic pollutants in groundwater. Heavy metal indicators: such as lead, mercury, cadmium, arsenic, chromium, etc. These elements are harmful to human health. Radioactive substances: such as uranium, thorium, etc. These substances may pose a threat to human health; and the above-mentioned pollutants mostly penetrate gradually from the ground to the underground until they pollute the groundwater aquifer. In order to find out the groundwater pollution situation, accurate sampling of groundwater is the key to the subsequent determination of various pollution indicators in the water body.

[0003] For example, Chinese invention patent CN116735279B discloses a groundwater pollutant extraction device; the extraction device includes an extraction body, a lifting mechanism is provided on one side of the extraction body, a drill rod and a driving member for driving the drill rod to rotate are provided on the lifting mechanism; an electronic detection component is provided inside the drill rod, and the electronic detection component is used to detect the content and composition of pollutants in groundwater to obtain pollution signals; a water sample extraction component is provided outside the drill rod. It extracts water samples when pollutants are detected in groundwater, ensuring that the extracted water samples are truly parallel samples, effectively reducing the problem of pollutant concentration differences in groundwater when underground horizontal sampling is not collected at the same time, and speeding up the collection speed of underground horizontal sampling.

[0004] However, when the inventors implemented this device, they found the following defects: when the drill bit drilled to the sampling location, the soil in the formed borehole was not discharged in time, causing the upper soil to fall into the sampling water layer. The pollutant content in the upper soil is high and easily soluble in water, which causes great interference to the sampling accuracy of groundwater. It is difficult to accurately obtain various actual indicators of groundwater pollution, and there are certain limitations in use. Summary of the invention

[0005] 1. Technical issues to be solved In view of the deficiencies in the prior art, the present invention provides a groundwater pollutant detection device and method with a more reasonable structural layout, which can effectively prevent the falling of the upper soil layer of the groundwater monitoring well from interfering with the water sample of the water extraction layer, and improve the detection accuracy of groundwater pollutants.

[0006] (II) Technical solution To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an underground water pollutant detection device, comprising a frame, a slide seat slidably mounted on the frame up and down, a discharge barrel member fixedly mounted on the bottom of the slide seat, a wall protection barrel detachably connected to the discharge barrel member, a rotating shaft rotatably mounted on the slide seat, a rotating driver providing power for the rotation of the rotating shaft, a water sample detection assembly installed on the upper part of the wall protection barrel and an isolation shoveling assembly installed at the bottom of the rotating shaft, the rotating shaft is provided with a spiral conveying blade that fits with the inner wall of the wall protection barrel and the discharge barrel member, the frame is provided with a lifting driver that provides power for the slide seat to slide up and down, the discharge barrel member is provided with a slag discharge pipe extending to the lower part of the outer part of the wall protection barrel; the water sample detection assembly is used for detecting underground water samples; the isolation shoveling assembly comprises a piston that fits with the inner wall of the wall protection barrel and the inner wall of the discharge barrel member, The piston is provided with a plurality of circumferentially evenly distributed through openings, and a blocking shovel plate that fits with the inner wall of the through opening is rotatably installed in the through opening. A closed inner cavity is provided in the middle of the piston, and a driving member for controlling the rotation of each blocking shovel plate is provided in the closed inner cavity; further, the rotary drive may be an electric motor or a hydraulic motor, etc.; the lifting drive may be a driving cylinder, a mechanical slide or other equivalent member that can drive the slide seat to slide up and down; the driving member may be a plurality of braking stepper motors, and the output shafts of the plurality of braking stepper motors are fixedly connected to the middle of the blocking shovel plate; the driving member may also be other equivalent members that can drive the blocking shovel plate to rotate and stop, and each blocking shovel plate forms an angle of 25°-75° with the horizontal plane when in the shoveling state. When the blocking shovel plate is in a horizontal state, the through opening can be completely blocked, and the discharge port of the slag discharge pipe faces downward.

[0007] Preferably, the driving member includes a plurality of rod shafts fixedly connected with the corresponding blocking shovel plates, a gear fixedly mounted on the end of the rod shaft and a plurality of racks, the racks are fixedly mounted on the bottom end of the rotating shaft, the racks are meshed with the corresponding gears, a guide core barrel is provided on the top of the piston, a guide sleeve is provided at the bottom of the rotating shaft, an annular sliding cavity is formed between the guide sleeve and the outer wall of the rotating shaft, the guide core barrel can be slidably installed in the annular sliding cavity up and down, a limiting ring plate is provided at the bottom of the guide sleeve, an inner concave ring groove is provided on the guide sleeve, which matches the limiting ring plate, the inner diameter of the limiting ring plate matches the outer diameter of the inner concave ring groove, and the limiting ring plate slides up and down along the outer wall of the inner concave ring groove; further, the rod shaft is arranged along the radial direction of the piston, and the rack is arranged parallel to the central axis of the rotating shaft; the inner diameter of the inner concave ring groove is at least 3 cm smaller than the outer diameter of the guide core barrel to prevent the limiting ring plate from falling off from the inner concave ring groove; the height of the inner concave ring groove is greater than the thickness of the limiting ring plate to provide space for the upper and lower movement of the limiting ring plate.

[0008] Preferably, the water sample detection assembly includes a conical valve body connected to the interior of the wall protection tube, a conical valve plug, a screw threaded on the conical valve body and a water sample detection sensor, the shape of the conical valve plug matches the connection point of the conical valve body and the wall protection tube, the top and bottom of the conical valve body are provided with a mounting tube and a sampling tube connected to the interior of the conical valve body, and the water sample detection sensor is installed in the mounting tube; further, the conical valve plug cannot move along the axial direction of the screw; the conical valve plug includes a conical portion and a straight portion, and the straight portion completely blocks the connection point between the conical valve body and the wall protection tube to reduce the residue of soil at the connection point between the conical valve body and the wall protection tube; the water sample detection sensor is connected to the signal of an external water sample analyzer, and the water sample detection sensor can adopt one or more of a biosensor, an electrochemical sensor or an optical sensor.

[0009] Preferably, a spring is fixedly installed in the closed inner cavity, and the piston is elastically connected to the rotating shaft through the spring; further, one end of the spring abuts against the bottom of the rotating shaft, and the other end of the spring abuts against the bottom wall of the closed inner cavity.

[0010] Preferably, a plurality of circumferentially arranged guide rails are fixedly installed on the inner wall of the annular sliding cavity, a sliding groove matching the guide rails is provided on the guide core tube, the guide rails are slidably installed in the corresponding sliding grooves, a plurality of guide rail grooves are fixedly installed in the closed inner cavity, and the rack is slidably installed in the corresponding guide rail groove.

[0011] Preferably, a spiral positioning drill bit is installed at the bottom of the piston, and the bottom of the spiral positioning drill bit is at least 5 cm lower than the bottom of the piston; so as to ensure that there is space for the sealing shovel plate to rotate when the bottom of the piston is in initial contact with the soil layer.

[0012] Preferably, a pipe connector is installed between the discharge barrel and the wall protection barrel, and the discharge barrel and the wall protection barrel are detachably connected through the pipe connector; further, the pipe connector can adopt flanges and bolts or oil joints; the pipe connector can also adopt socket joints, threaded joints or other equivalent parts with detachable effect.

[0013] Preferably, a first flexible sealing ring is provided on the inner wall of the through-hole, and a second flexible sealing ring is provided on the outer wall of the piston.

[0014] Preferably, the bottom of the wall protection tube is provided with seepage holes evenly distributed in the circumferential direction, and a percolation net is provided at the seepage holes; further, the mesh hole diameter of the percolation net allows water to pass through but does not allow soil particles to pass through.

[0015] A method for detecting groundwater pollutants, using the above-mentioned groundwater pollutant detection device to detect water quality, comprises the following steps: S1. Drilling operation: install the frame in place. In the initial state, under the action of the spring, the piston moves away from the rotating shaft, the blocking shovel plate is in a closed state, the lifting drive drives the slide seat to move downward, the rotating drive drives the rotating shaft to rotate, the spiral positioning drill bit contacts the soil layer and locates the drilling point; the guide core cylinder moves upward along the annular sliding cavity, and the piston moves upward relative to the rotating shaft until the top of the limit ring plate contacts the inner bottom wall of the inner concave ring groove, and the gear rolls upward along the corresponding rack, and the gear drives the rod shaft and the blocking shovel plate to rotate to the open state; the rotating shaft drives the piston to rotate synchronously during the rotation process, and the blocking shovel plate shovels the soil into the wall protection tube through the penetration port, and the spiral conveying blade transports the slag in the wall protection tube to the discharge tube, and the slag is discharged through the slag discharge pipe. A hole with a diameter of 10-30cm is drilled at the sampling point, and the drilling depth of the hole is 10cm below the average water layer depth of the sampling site; S2. Pumping operation: When the required water sample collection depth is reached, the discharge cylinder is detached from the wall protection cylinder, the wall protection cylinder is inserted into the formed drilled hole, the lifting driver drives the slide seat and the rotating shaft to move upward, and the piston moves upward along the inner wall of the wall protection cylinder until the top of the limit ring plate contacts the inner top wall of the concave ring groove. During this process, the gear rolls downward relatively along the corresponding rack, and the rod shaft drives the sealing shovel plate to reset and completely seal the through-hole. During the upward movement of the piston, negative pressure is generated inside the wall protection cylinder, and groundwater is sucked into the wall protection cylinder under the action of negative pressure. The piston moves to above the water sample detection component until the liquid level in the wall protection cylinder submerges the water sample detection component; S3, water sample detection operation: after the water sample in the wall protection tube is left to settle for 5-10 minutes, the screw is turned, the conical valve plug moves to the side away from the wall protection tube, the conical valve plug is separated from the blockage of the conical valve body, and the water in the wall protection tube flows into the conical valve body. The water sample is detected in real time by the water sample detection sensor. At least 5 groups of water data are measured on site, and 5 water samples are retained at the sampling tube at the same time; the average value of the 5 groups of data measured by the water sample detection sensor is taken and compared with the standard value of water pollution data. If it exceeds the standard value of water pollution data, it means that the water body has been polluted. If the data is lower than the standard value of water pollution data, it means that the water body is not polluted; S4. Laboratory re-testing: Re-test the five retained water samples in the laboratory, record the test data and calculate the average value; S5. Data comparison and processing: Compare the average value of water sample data measured by the on-site water sample detection sensor with the average value of water sample data measured in the laboratory. If the difference between the two is within the allowable error range, it means that the water pollution detection data is accurate; if the difference between the two exceeds the allowable error range, analyze the cause, eliminate related factors, and re-determine the sampling point within 1m of the sampling point. Resample the water and retest according to the above steps until the difference between the water sample detection data and the laboratory detection data is within the allowable error range.

[0016] (III) Beneficial effects Compared with the prior art, the present invention provides a groundwater pollutant detection device and detection method, which have the following beneficial effects: in the groundwater pollutant detection device and detection method, when drilling, the plugging shovel plate is in an open state, the lifting drive drives the slide seat to move downward, the rotating drive drives the rotating shaft to rotate, the plugging shovel plate shovels the soil into the wall protection tube through the penetration port, and the spiral conveying blades convey the slag in the wall protection tube to the discharge tube part, and the slag is discharged to the outside through the slag discharge pipe. When the required water sample collection depth is reached, the driving part drives the plugging shovel plate to rotate and completely seal the penetration port, the discharge tube part is detached from the wall protection tube, and the wall protection tube is inserted into the formed borehole. , the lifting drive drives the slide and the rotating shaft to move upward, and the piston moves upward along the inner wall of the wall protection tube. During the upward movement of the piston, negative pressure is generated inside the wall protection tube, and groundwater is sucked into the wall protection tube under the action of negative pressure. When the piston moves to the top of the water sample detection component and the liquid level in the wall protection tube submerges the water sample detection component, the water sample is detected by the water sample detection component. The soil in the drilling process always moves from bottom to top in the wall protection tube, and the plugging shovel will block the penetration during the pumping process. The piston effectively isolates the sampled water from the soil in the wall protection tube, effectively preventing the upper soil of the groundwater monitoring well from falling and interfering with the water sample of the water layer, thereby improving the detection accuracy of groundwater pollutants. The groundwater pollutant detection device and detection method make the water sampling, especially the water sampling in the heavily polluted soil area, more representative, effectively avoid the problem of high concentration of pollutants in the groundwater sample caused by the upper polluted soil of the groundwater monitoring well falling into the sampling aquifer, and make the detection results more real and accurate to reflect the groundwater environmental quality in the sampling area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a bottom upward plan view of the structure of the present invention; Figure 3 The present invention Figure 2 Schematic diagram of the cross-section structure at AA in the middle; Figure 4 It is a three-dimensional structural schematic diagram of the piston of the present invention in a state where the plugging shovel plate closes the through opening; Figure 5 It is a three-dimensional structural schematic diagram of the piston of the present invention in an open state of the blocking shovel plate; Figure 6 It is a schematic diagram of the planar structure of the piston of the present invention when viewed from above; Figure 7 It is a schematic diagram of the internal cross-sectional structure of the water sample detection component of the present invention; Figure 8 The present invention Figure 1 A schematic diagram of the partially enlarged structure at B in the middle; Fig. 9 The present invention Figure 1 A schematic diagram of the partially enlarged structure at C in the middle; Fig.10 The present invention Figure 3 The schematic diagram of the local enlarged structure at D in the middle; Fig.11 The present invention Figure 3 The schematic diagram of the local enlarged structure at E in the middle; Fig.12 The present invention Fig.11 The schematic diagram of the partial enlarged structure at F in the middle; Markings in the attached drawings: 1. frame; 2. slide seat; 3. discharge barrel; 4. wall protection barrel; 5. rotating shaft; 6. rotary drive; 7. spiral conveying blade; 8. lifting drive; 9. slag discharge pipe; 10. piston; 11. through-hole; 12. sealing shovel plate; 13. closed inner cavity; 14. rod shaft; 15. gear; 16. rack; 17. guide core barrel; 18. guide sleeve; 19. limit ring plate; 20. concave ring groove; 21. conical valve body; 22. conical valve plug; 23. screw; 24. water sample detection sensor; 25. installation tube; 26. sampling tube; 27. spring; 28. guide rail; 29. ​​slide groove; 30. guide rail groove; 31. spiral positioning drill bit; 32. pipeline connector; 33. first flexible sealing ring; 34. second flexible sealing ring; 35. percolation net. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the invention, the technical solutions in the embodiments of the invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the invention. Obviously, the described embodiments are only embodiments of a part of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the invention.

[0019] It should be noted that, in the absence of conflict, the embodiments of the invention and the features and technical solutions in the embodiments may be combined with each other.

[0020] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings. Example 1

[0021] Please refer to Figure 1-3, a groundwater pollutant detection device, comprising: a frame 1, a slide seat 2 slidably mounted on the frame 1, a discharge barrel 3 fixedly mounted on the bottom of the slide seat 2, a wall protection barrel 4 detachably connected to the discharge barrel 3, a rotating shaft 5 rotatably mounted on the slide seat 2, a rotary driver 6 providing power for the rotation of the rotating shaft 5, a water sample detection component mounted on the upper part of the wall protection barrel 4 and an isolation shovel component mounted at the bottom of the rotating shaft 5, a spiral conveying blade 7 that fits with the inner wall of the wall protection barrel 4 and the discharge barrel 3 is provided on the rotating shaft 5, and a screw conveying blade 7 that fits with the inner wall of the wall protection barrel 4 and the discharge barrel 3 is installed on the frame 1. A powered lifting driver 8 is provided, and a slag discharge pipe 9 extending downward to the outside of the wall protection tube 4 is provided on the discharge tube 3; a water sample detection assembly is used for detecting underground water samples; the isolation shovel assembly includes a piston 10 that fits with the inner wall of the wall protection tube 4 and the inner wall of the discharge tube 3, and the piston 10 is provided with a plurality of circumferentially uniformly distributed through holes 11, and a blocking shovel plate 12 that fits with the inner wall of the through hole 11 is rotatably installed in the through hole 11, and a closed inner cavity 13 is provided in the middle of the piston 10, and a driving member for controlling the rotation of each blocking shovel plate 12 is provided in the closed inner cavity 13; further, the rotary driver 6 can be adopted An electric motor or a hydraulic motor is used; the lifting driver 8 can be a driving cylinder, a mechanical slide or other equivalent parts that can drive the slide seat 2 to slide up and down; the driving part can be a plurality of braking stepper motors, and the output shafts of the plurality of braking stepper motors are fixedly connected to the middle of the blocking shovel plate 12; the driving part can also be other equivalent parts that can drive the blocking shovel plate 12 to rotate and stop, and each blocking shovel plate 12 forms an angle of 25°-75° with the horizontal plane when in the shoveling state. When the blocking shovel plate 12 is in a horizontal state, the through-hole 11 can be completely blocked, and the discharge port of the slag discharge pipe 9 faces downward; The continuous operation of drilling and groundwater sampling is realized without the need for a complex external water pump structure; the blocking shovel plate 12 can improve the smoothness of soil debris entering the wall protection tube 4 through the penetration port 11 during drilling, and can also effectively reduce the falling of the upper soil; especially when extracting and testing groundwater samples, the blocking shovel plate 12 completely blocks the penetration port 11, thereby completely isolating the water sample from the upper soil layer, and effectively preventing the upper soil from mixing into the water sample; the continuous operation of drilling, water sampling and water sampling testing is realized, thereby improving the water sampling testing efficiency while ensuring the water sampling accuracy.

[0022] For details, please refer to Figure 8 A pipe connector 32 is installed between the discharge barrel 3 and the wall protection barrel 4, and the discharge barrel 3 and the wall protection barrel 4 are detachably connected through the pipe connector 32; further, the pipe connector 32 can adopt flanges and bolts or oil joints; the pipe connector 32 can also adopt socket joints, threaded joints or other equivalent parts with detachable effect; the pipe connector 32 is used to realize quick disassembly and assembly between the discharge barrel 3 and the wall protection barrel 4.

[0023] For details, please refer to Figure 4-5; A first flexible sealing ring 33 is provided on the inner wall of the through-port 11, and a second flexible sealing ring 34 is provided on the outer wall of the piston 10; the first flexible sealing ring 33 and the second flexible sealing ring 34 are preferably wear-resistant rubber rings; when the sealing shovel plate 12 blocks the through-port 11, the first flexible sealing ring 33 is deformed to ensure that the sealing shovel plate 12 rotates smoothly at the through-port 11, effectively ensuring the sealing of the sealing shovel plate 12 and the through-port 11; the second flexible sealing ring 34 can improve the sealing between the piston 10 and the inner wall of the wall protection tube 4. Under the action of the first flexible sealing ring 33 and the second flexible sealing ring 34, it can be ensured that the piston 10 generates a vacuum effect at the lower part of the wall protection tube 4 during the upward movement of the wall protection tube 4, thereby prompting the water in the sampling water layer to quickly enter the wall protection tube 4 through the bottom of the wall protection tube 4.

[0024] For details, please refer to Fig. 9 The bottom of the wall protection tube 4 is provided with seepage holes evenly distributed in the circumference, and a percolation net 35 is provided at the seepage holes; further, the mesh aperture of the percolation net 35 allows water to pass through but does not allow soil particles to pass through. The percolation net 35 at the seepage hole allows water in the sampling water layer to enter the wall protection tube 4, increasing the water inlet area of ​​the wall protection tube 4 at the sampling water layer, thereby increasing the flow rate of water samples entering the wall protection tube 4, shortening the water sample extraction time, and providing a guarantee for improving the water sample detection efficiency.

[0025] For details, please refer to Figure 4-6 as well as Figure 11-12 The driving member includes a plurality of rod shafts 14 fixedly connected to the corresponding blocking shovel plates 12, a gear 15 fixedly installed at the end of the rod shaft 14, and a plurality of racks 16. The rack 16 is fixedly installed at the bottom end of the rotating shaft 5, and the rack 16 is meshed with the corresponding gear 15. A guide core cylinder 17 is provided at the top of the piston 10, and a guide sleeve 18 is provided at the bottom of the rotating shaft 5. An annular sliding cavity is formed between the guide sleeve 18 and the outer wall of the rotating shaft 5. The guide core cylinder 17 can be slidably installed in the annular sliding cavity up and down. A limiting ring plate 19 is provided at the bottom of the guide sleeve 18. An inner concave ring groove 20 that matches the limiting ring plate 19 is provided on the guide sleeve 18. The inner diameter of the limiting ring plate 19 matches the outer diameter of the inner concave ring groove 20, and the limiting ring plate 19 slides up and down along the outer wall of the inner concave ring groove 20; further In the embodiment of the present invention, the rod shaft 14 is arranged along the radial direction of the piston 10, and the rack 16 is arranged parallel to the central axis of the rotating shaft 5; the inner diameter of the concave ring groove 20 is at least 3 cm smaller than the outer diameter of the guide core tube 17 to prevent the limiting ring plate 19 from falling off from the concave ring groove 20; the height of the concave ring groove 20 is greater than the thickness of the limiting ring plate 19 to provide space for the upward and downward movement of the limiting ring plate 19; when drilling, the bottom of the piston 10 contacts the soil layer to be drilled, and the guide core tube 17 moves up along the annular sliding cavity, that is, the piston 10 moves upward relative to the rotating shaft 5 until the top of the limiting ring plate 19 contacts the inner bottom wall of the concave ring groove 20, and the gear 15 rolls upward along the corresponding rack 16, and the gear 15 drives the rod shaft 14 and the blocking shovel plate 12 to rotate to the position as shown in the figure. Figure 5The state shown; in this way, the blocking shovel plate 12 is automatically opened during the drilling operation; when the water sample is extracted after reaching the drilling depth, the piston 10 moves up along the inner wall of the wall protection tube 4, and under the action of the internal friction of the wall protection tube 4 and the gravity of the residual soil residue in the wall protection tube 4, the piston 10 slides downward relative to the rotating shaft 5 until the top of the limit ring plate 19 contacts the inner top wall of the concave ring groove 20 (please refer to Fig.11 ), at this time, the blocking shovel plate 12 is in a horizontal state and seals the through-opening 11; no complicated electronic control equipment is required, and the automatic opening and closing of the blocking shovel plate 12 can be achieved by relying on a simple mechanical structure. The structure is scientific and simple, which reduces the frequency of subsequent maintenance and overhaul.

[0026] For details, please refer to Fig.11 A spring 27 is fixedly installed in the closed inner cavity 13, and the piston 10 is elastically connected to the rotating shaft 5 through the spring 27; further, one end of the spring 27 abuts against the bottom of the rotating shaft 5, and the other end of the spring 27 abuts against the inner bottom wall of the closed inner cavity 13; under the elastic force of the spring 27, the piston 10 can be urged to move downward relative to the rotating shaft 5 with a downward trend, ensuring that the sealing shovel plate 12 quickly returns to a horizontal state after the piston 10 is out of contact with the soil layer, so as to reduce the soil debris above the piston 10 from falling through the through-hole 11 to the sampling water layer.

[0027] For details, please refer to Figure 4-5 as well as Figure 10-11 A plurality of circumferentially arranged guide rails 28 are fixedly installed on the inner wall of the annular sliding cavity, a slide groove 29 matching the guide rail 28 is provided on the guide core tube 17, the guide rail 28 is slidably installed in the corresponding slide groove 29, a plurality of guide rail grooves 30 are fixedly installed in the closed inner cavity 13, and the rack 16 is slidably installed in the corresponding guide rail groove 30; under the action of the guide rail groove 30 and the slide groove 29, the piston 10 can be ensured to slide up and down along the annular sliding cavity, and the piston 10 can be prevented from rotating around the rotating shaft 5, so as to ensure that the blocking shovel plate 12 can shovel the soil smoothly.

[0028] For details, please refer to Fig.10 A spiral positioning drill bit 31 is installed at the bottom of the piston 10, and the bottom of the spiral positioning drill bit 31 is at least 5 cm lower than the bottom of the piston 10; to ensure that the bottom of the piston 10 is in initial contact with the soil layer, leaving space for the sealing shovel plate 12 to rotate; the spiral positioning drill bit 31 can improve the grip between the piston 10 and the soil layer to be drilled, reduce the inclination rate of the drilling, improve the drilling smoothness and drilling progress, and the distance between the bottom of the spiral positioning drill bit 31 and the bottom of the piston 10 can allow the initial sealing shovel plate 12 to be opened smoothly.

[0029] The groundwater pollutant detection device provided in this embodiment, through the above-mentioned structure, can realize the rapid and continuous operations of drilling holes in the soil layer, extracting water samples and detecting water samples in a single time, and effectively avoids the upper soil layer from falling into the sampling water layer, thereby ensuring the accuracy of water sample detection and effectively improving the detection efficiency of water samples. Example 2

[0030] For details, please refer to Figure 7-Figure 8 ; The water sample detection component includes a conical valve body 21 connected to the interior of the wall protection tube 4, a conical valve plug 22, a screw 23 screwed on the conical valve body 21 and a water sample detection sensor 24. The shape of the conical valve plug 22 matches the connection point of the conical valve body 21 and the wall protection tube 4. The top and bottom of the conical valve body 21 are provided with a mounting tube 25 and a sampling tube 26 connected to the interior of the conical valve body 21, and the water sample detection sensor 24 is installed in the mounting tube 25; further, the conical valve plug 22 cannot move axially along the screw 23; the conical valve plug 22 includes a conical portion and a straight portion, and the straight portion completely blocks the connection point between the conical valve body 21 and the wall protection tube 4 to reduce the soil residue at the connection point between the conical valve body 21 and the wall protection tube 4; the water sample detection sensor 24 is connected to the signal of an external water sample analyzer, and the water sample detection sensor 24 can adopt a biosensor, an electrochemical sensor or One or more optical sensors can perform diverse detection of pollutants in water samples; in another embodiment, the water sample detection sensor 24 can be detachably installed in the installation tube 25, and water sample detection sensors 24 with different detection functions can be installed in the installation tube 25 according to the detection requirements of different pollutants, so as to improve the diversity of the detection functions of the water sample detection component for water samples; the water sample detection sensor 24 is connected to the external analyzer signal, and the detected electrical signal is transmitted to the external analyzer through the water sample detection sensor 24, and the water sample is analyzed by the analyzer to finally obtain the actual pollution data of the groundwater; the conical valve plug 22 in the non-sampling state completely blocks the inside of the conical valve body 21, and the end of the conical valve plug 22 is flush with the inner wall of the wall protection tube 4 to prevent the soil in the wall protection tube 4 from entering the conical valve body 21, so as to further ensure the sampling accuracy of the water body.

[0031] The groundwater pollutant detection device provided in this embodiment has the function of rotating the screw 23 to move the conical valve plug 22 away from the wall protection tube 4 when the water level in the wall protection tube 4 is higher than the water sample detection component. The conical valve plug 22 is separated from the blockage of the conical valve body 21, and the water in the wall protection tube 4 flows into the conical valve body 21. The water sample is detected in real time by the water sample detection sensor 24, and the operator can collect the water flowing out through the sampling tube 26 for sampling so as to re-inspect or further detect the water later.

[0032] A method for detecting groundwater pollutants, using the above-mentioned groundwater pollutant detection device to detect water quality, comprises the following steps: S1. Drilling operation: Install the frame 1 in place. In the initial state, under the action of the spring 27, the piston 10 moves away from the rotating shaft 5, the blocking shovel plate 12 is in a closed state, the lifting driver 8 drives the slide 2 to move downward, the rotary driver 6 drives the rotating shaft 5 to rotate, the spiral positioning drill bit 31 contacts the soil layer and locates the drilling point; the guide core cylinder 17 moves upward along the annular sliding cavity, and the piston 10 moves upward relative to the rotating shaft 5 until the top of the limit ring plate 19 contacts the inner bottom wall of the concave ring groove 20, and the gear 1 5 rolls upward along the corresponding rack 16, and the gear 15 drives the rod shaft 14 and the plugging shovel plate 12 to rotate to the open state; during the rotation of the shaft 5, the piston 10 is driven to rotate synchronously, and the plugging shovel plate 12 shovels the soil into the wall protection tube 4 through the through hole 11, and the spiral conveying blade 7 conveys the slag in the wall protection tube 4 to the discharge tube 3, and the slag is discharged through the slag discharge pipe 9. A borehole with a diameter of 10-30cm is drilled at the sampling point, and the drilling depth of the borehole is 10cm below the average water layer depth of the sampling site; S2. Pumping operation: When the required water sample collection depth is reached, the discharge cylinder 3 is detached from the wall protection cylinder 4, and the wall protection cylinder 4 is inserted into the formed borehole. The lifting driver 8 drives the slide 2 and the rotating shaft 5 to move upward, and the piston 10 moves upward along the inner wall of the wall protection cylinder 4 until the top of the limit ring plate 19 contacts the inner top wall of the concave ring groove 20. During this process, the gear 15 rolls downward relatively along the corresponding rack 16, and the rod shaft 14 drives the sealing shovel plate 12 to reset and completely block the through-hole 11. During the upward movement of the piston 10, negative pressure is generated inside the wall protection cylinder 4, and the groundwater is sucked into the wall protection cylinder 4 under the action of the negative pressure. The piston 10 moves above the water sample detection component until the liquid level in the wall protection cylinder 4 submerges the water sample detection component; S3, water sample detection operation: after the water sample in the wall protection tube 4 is allowed to settle for 5-10 minutes, the screw 23 is rotated, the conical valve plug 22 moves to the side away from the wall protection tube 4, the conical valve plug 22 is separated from the blockage of the conical valve body 21, and the water in the wall protection tube 4 flows into the conical valve body 21, and the water sample is detected in real time by the water sample detection sensor 24, and at least 5 groups of water body data are measured on site, and 5 water body samples are retained at the sampling tube 26 at the same time; the average value of the 5 groups of data measured by the water sample detection sensor 24 is taken and compared with the standard value of water body pollution data, if it exceeds the standard value of water body pollution data, it means that the water body has been polluted, and if the data is lower than the standard value of water body pollution data, it means that the water body is not polluted; S4. Laboratory re-testing: Re-test the five retained water samples in the laboratory, record the test data and calculate the average value; S5. Data comparison and processing: compare the average value of the water sample data measured by the on-site water sample detection sensor 24 with the average value of the water sample data measured in the laboratory. If the difference between the two is within the allowable error range, it means that the water pollution detection data is accurate; if the difference between the two exceeds the allowable error range, after analyzing the cause, eliminate the relevant factors, re-determine the sampling point within 1m of the sampling point, re-sample the water body and re-test according to the above steps until the difference between the water sample detection data and the laboratory detection data is within the allowable error range.

[0033] The groundwater pollutant detection method can further improve the accuracy of groundwater pollution detection. By relying on the groundwater pollutant detection method to detect water samples and eliminate the influence of the upper soil on the water sample detection accuracy, the sampling accuracy of the water sample can be effectively guaranteed, thereby ensuring the accuracy of the water sample detection.

[0034] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be fixedly connected, detachably connected, or integrated; it can be mechanically connected, electrically connected, or able to communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

Claims

1. A groundwater pollutant detection device, characterized in that: The invention comprises a frame (1), a slide seat (2) mounted on the frame (1) for sliding up and down movement, a discharge barrel (3) fixedly mounted on the bottom of the slide seat (2), a wall protection barrel (4) detachably connected to the discharge barrel (3), a rotating shaft (5) mounted on the slide seat (2), a rotary driver (6) for providing power for the rotation of the rotating shaft (5), a water sample detection component mounted on the upper part of the wall protection barrel (4), and an isolation shovel component mounted on the bottom of the rotating shaft (5), wherein the rotating shaft (5) is provided with a spiral conveying blade (7) which fits with the inner wall of the wall protection barrel (4) and the discharge barrel (3), and the frame (1) is provided with a lifting device (6) for providing power for the slide seat (2) to slide up and down. A descending drive (8), wherein the discharge barrel (3) is provided with a slag discharge pipe (9) extending downwardly to the outside of the wall protection barrel (4); the water sample detection assembly is used for detecting underground water samples; the isolation shovel assembly comprises a piston (10) which is matched with the inner wall of the wall protection barrel (4) and the inner wall of the discharge barrel (3); the piston (10) is provided with a plurality of circumferentially uniformly distributed through openings (11); a sealing shovel plate (12) which is matched with the inner wall of the through opening (11) is rotatably installed in the through opening (11); a closed inner cavity (13) is provided in the middle of the piston (10); a driving member for controlling the rotation of each sealing shovel plate (12) is provided in the closed inner cavity (13).

2. The groundwater pollutant detection device according to claim 1, characterized in that: The driving member comprises a plurality of rod shafts (14) fixedly connected to corresponding plugging shovel plates (12), a gear (15) fixedly mounted on the end of the rod shaft (14), and a plurality of racks (16), wherein the racks (16) are fixedly mounted on the bottom end of the rotating shaft (5), and the racks (16) mesh with the corresponding gears (15). A guide core cylinder (17) is provided at the top of the piston (10), and a guide sleeve (18) is provided at the bottom of the rotating shaft (5). The guide sleeve (18) is provided at the bottom of the rotating shaft (5). An annular sliding cavity is formed between the guide sleeve (18) and the outer wall of the rotating shaft (5), and the guide core tube (17) is installed in the annular sliding cavity so as to slide up and down. A limiting ring plate (19) is provided at the bottom of the guide sleeve (18), and an inner concave ring groove (20) is provided on the guide sleeve (18) and matches with the limiting ring plate (19). The inner diameter of the limiting ring plate (19) matches with the outer diameter of the inner concave ring groove (20), and the limiting ring plate (19) slides up and down along the outer wall of the inner concave ring groove (20).

3. The groundwater pollutant detection device according to claim 2, characterized in that: The water sample detection assembly comprises a conical valve body (21) connected to the interior of the wall protection tube (4), a conical valve plug (22), a screw (23) screwed onto the conical valve body (21), and a water sample detection sensor (24); the conical valve plug (22) has an outer shape that matches the connection point between the conical valve body (21) and the wall protection tube (4); the top and bottom of the conical valve body (21) are provided with a mounting tube (25) and a sampling tube (26) connected to the interior of the conical valve body (21); and the water sample detection sensor (24) is mounted in the mounting tube (25).

4. The groundwater pollutant detection device according to claim 2, characterized in that: A spring (27) is fixedly installed in the closed inner cavity (13), and the piston (10) is elastically connected to the rotating shaft (5) via the spring (27).

5. The groundwater pollutant detection device according to claim 2, characterized in that: A plurality of circumferentially arranged guide rails (28) are fixedly mounted on the inner wall of the annular sliding cavity, a slide groove (29) matching the guide rail (28) is provided on the guide core tube (17), the guide rail (28) is slidably mounted in the corresponding slide groove (29), a plurality of guide rail grooves (30) are fixedly mounted in the closed inner cavity (13), and the rack (16) is slidably mounted in the corresponding guide rail groove (30).

6. The groundwater pollutant detection device according to claim 1, characterized in that: A spiral positioning drill bit (31) is installed at the bottom of the piston (10), and the bottom of the spiral positioning drill bit (31) is at least 5 cm lower than the bottom of the piston (10).

7. The groundwater pollutant detection device according to claim 1, characterized in that: A pipe connecting piece (32) is installed between the material discharging cylinder (3) and the wall protecting cylinder (4), and the material discharging cylinder (3) and the wall protecting cylinder (4) are detachably connected via the pipe connecting piece (32).

8. The groundwater pollutant detection device according to claim 1, characterized in that: A first flexible sealing ring (33) is provided on the inner wall of the through-hole (11), and a second flexible sealing ring (34) is provided on the outer wall of the piston (10).

9. The groundwater pollutant detection device according to claim 1, characterized in that: The bottom of the wall protection tube (4) is provided with water seepage openings evenly distributed in the circumferential direction, and a filter net (35) is provided at the water seepage openings.

10. A method for detecting groundwater pollutants, using the groundwater pollutant detection device described in any one of claims 1 to 9 to detect groundwater quality, characterized in that: The following steps are involved: S1. Drilling operation: The frame (1) is installed in place. In the initial state, under the action of the spring (27), the piston (10) moves away from the rotating shaft (5), the blocking shovel plate (12) is in a closed state, the lifting drive (8) drives the slide seat (2) to move downward, the rotary drive (6) drives the rotating shaft (5) to rotate, the spiral positioning drill bit (31) contacts the soil layer and locates the drilling point; the guide core cylinder (17) moves upward along the annular sliding cavity, and the piston (10) moves upward relative to the rotating shaft (5) until the top of the limit ring plate (19) contacts the inner bottom wall of the concave annular groove (20), and the gear (15) rolls upward along the corresponding rack (16), and the gear (15) drives the rod shaft (14) and the plugging shovel plate (12) to rotate to the open state; the rotating shaft (5) drives the piston (10) to rotate synchronously during the rotation process, and the plugging shovel plate (12) shovels the soil into the wall protection tube (4) through the penetration opening (11), and the spiral conveying blade (7) conveys the slag in the wall protection tube (4) to the discharge tube (3), and the slag is discharged outside through the slag discharge pipe (9), and a borehole with a diameter of 10-30 cm is drilled at the sampling point, and the drilling depth of the borehole is 10 cm below the average water layer depth of the sampling site; S2, pumping operation: when the required water sample collection depth is reached, the discharge cylinder (3) is detached from the wall protection cylinder (4), the wall protection cylinder (4) is inserted into the formed borehole, the lifting drive (8) drives the slide seat (2) and the rotating shaft (5) to move upward, and the piston (10) moves upward along the inner wall of the wall protection cylinder (4) until the top of the limit ring plate (19) contacts the inner top wall of the concave ring groove (20). During this process, the gear (15) rolls downward along the corresponding rack (16), the rod shaft (14) drives the sealing shovel plate (12) to reset and completely block the through-hole (11). During the upward movement of the piston (10), negative pressure is generated inside the wall protection cylinder (4), and groundwater is sucked into the wall protection cylinder (4) under the action of the negative pressure. The piston (10) moves to above the water sample detection component until the liquid level in the wall protection cylinder (4) submerges the water sample detection component; S3, water sample detection operation: after the water sample in the wall protection tube (4) is allowed to settle for 5-10 minutes, the screw (23) is rotated, the conical valve plug (22) moves to the side away from the wall protection tube (4), the conical valve plug (22) is separated from the blockage of the conical valve body (21), and the water in the wall protection tube (4) flows into the conical valve body (21). The water sample is detected in real time by the water sample detection sensor (24), and at least 5 groups of water body data are measured on site. 5 water body samples are simultaneously retained at the sampling tube (26); the average value of the 5 groups of data measured by the water sample detection sensor (24) is taken and compared with the standard value of water body pollution data. If the data exceeds the standard value of water body pollution data, it means that the water body has been polluted. If the data is lower than the standard value of water body pollution data, it means that the water body is not polluted; S4. Laboratory re-testing: Re-test the five retained water samples in the laboratory, record the test data and calculate the average value; S5, data comparison and processing operation: compare the average value of the water sample data measured by the on-site water sample detection sensor (24) with the average value of the water sample data measured in the laboratory. If the difference between the two is within the allowable error range, it means that the water pollution detection data is accurate. If the difference between the two is beyond the allowable error range, analyze the cause, eliminate the relevant factors, re-determine the sampling point within 1m of the sampling point, re-sample the water body and re-test according to the above steps until the difference between the water sample detection data and the laboratory detection data is within the allowable error range.

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