A kind of water quality online monitoring equipment and monitoring method of heavy metal mercury

Abstract

The invention discloses an online water quality monitoring device and a monitoring method for heavy metal mercury, which relates to the technical field of water quality monitoring, and comprises a detection box, a protective cover and a panel are installed above the detection box, a removable sampling tube and a digestion tube are installed inside the detection box, a solution box and a feeding pump are installed inside the detection box, the feeding pump pumps the water sample in the sampling tube into the digestion tube, a solution pump is installed on the solution box, the solution pump pumps the solution in the solution box into the digestion tube, a sampling mechanism is installed on the digestion tube, the sampling mechanism transports the doped water sample inside the digestion tube to a spectral analysis and determination system, the spectral analysis and determination system determines the mercury content of the doped water sample, and the spectral analysis and determination system is electrically connected to the control system inside the panel. The spectral analysis and determination system feeds back the analysis and determination results to the control system, and the control system displays the determination results through the panel to realize online monitoring of the mercury content.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality monitoring, and in particular to an online water quality monitoring device and a monitoring method for heavy metal mercury. Background Art

[0002] Mercury is a silvery-white liquid metal that is widely present in nature. It is highly fluid and can evaporate at room temperature. Various natural phenomena can cause mercury to circulate continuously from the surface through the atmosphere, rain and snow, and can be absorbed by plants and animals, and enter the human body through the food chain, causing poisoning. Due to the harmfulness of heavy metal pollution, real-time monitoring of heavy metal pollution is particularly important. In the actual sampling process, the collected water samples contain impurities such as sediment, particulate matter or turbidity. Under the influence of impurities, monitoring equipment often has problems such as pipe and pipe blockage and wear. In actual operation, there is also the problem of frequent replacement of pumps and pipes. Due to the presence of impurities, the sampling time is long and the equipment cleaning is difficult, which affects the normal development of online monitoring. Summary of the invention

[0003] The object of the present invention is to provide an online water quality monitoring device and a monitoring method for heavy metal mercury to solve the problems raised in the above background technology.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: an online water quality monitoring device for heavy metal mercury, including a spectral analysis and measurement system, the monitoring device including a detection box, a protective cover and a panel are installed above the detection box, a removable sampling cylinder and a digestion cylinder are installed inside the detection box, a solution box and a loading pump are installed inside the detection box, the loading pump pumps the water sample in the sampling cylinder into the digestion cylinder, a solution pump is installed on the solution box, the solution pump is connected to a reagent tube, the solution pump pumps the solution (medicine or clean water) in the solution box into the digestion cylinder through the reagent tube, a sampling mechanism is installed on the digestion cylinder, the sampling mechanism transports the doped water sample inside the digestion cylinder to the spectral analysis and measurement system, the spectral analysis and measurement system performs mercury content determination on the doped water sample, and the spectral analysis and measurement system is electrically connected to the control system inside the panel. When it is necessary to collect water samples, open the protective cover and take out the sampling cylinder in the detection box. After the sampling cylinder collects the water sample, put the sampling cylinder into the detection box again and cover it with the protective cover. The loading pump pumps the water sample in the sampling cylinder into the digestion cylinder, and the solution pump pumps the reagent into the digestion cylinder. The reagent and the water sample are mixed. The digestion cylinder heats the doped water sample. After the processing heat reaches the corresponding temperature and time, the doped water sample is cooled. The sampling mechanism samples the doped water sample after the digestion cylinder treatment and sends it to the spectral analysis system for measurement and analysis. In addition to storing reagents, the solution tank also stores clean water. The solution tank is connected to a cleaning pump (not shown in the figure) through a pipeline. The cleaning pump draws clean water and infuses it into the digestion cylinder and the holder. The feeding pump draws clean water from the holder for self-cleaning. A drain pipe (not shown in the figure) is connected to one side of the lower end of the digestion cylinder. The drain pipe is connected in series with a valve. The water after cleaning the digestion cylinder and the water after cleaning the feeding pump flow out of the equipment through the drain pipe.

[0005] A handle is installed on the sampling cylinder, a base is provided below the sampling cylinder, a through groove is provided at the lower end of the sampling cylinder, a filter screen and an aperture are installed on the inner side of the base, the aperture is located below the filter screen, a central axis is installed in the middle of the filter screen, a driving mechanism is provided on the sampling cylinder, the driving mechanism provides power for the aperture, a holder is provided inside the detection box, a supporting ring is installed on the inner side of the holder, at least two suction ports are provided on the holder, the feeding pump is connected to the suction port through a material pipe, an arc-shaped groove is provided on the outer side of the lower end of the base, the upper end face of the supporting ring is an arc surface, the inner diameter of the holder is equal to the outer diameter of the base, at least four slots are provided above the holder, a buckle is installed in the slot by sliding through a spring, the buckle is in a "Z" shape, a fillet is provided above one end of the buckle, and the buckle fixes the base in the holder. The sampling tube is placed in the holder through the base. During the placement process, the base will contact the rounded corner of the upper end of the buckle. The arc-shaped groove at the lower end of the base cooperates with the rounded corner to push the buckle outward, so that the buckle makes way for the movement path of the base. After the base moves to the inside of the holder and contacts the support ring, the buckle is reset by the spring and snaps on the top of the base to fix the position of the base. The aperture and the central axis cooperate with each other to control the flow of water samples. The aperture controls the cross-sectional area of ​​the flow channel when the water sample flows. When the sampling tube needs to draw water samples from the outside, the driving mechanism provides power to the aperture, and the aperture opens the flow channel. When the water sample enters the sampling tube through the aperture and the filter, the filter filters the water sample. After the sampling tube draws enough water samples, the sampling tube discharges part of the water backflowing outward, and the filter is cleaned by the refluxed water sample. Place the sampling cylinder containing the water sample in the holder. The arc groove on the base matches the arc surface on the support ring, increasing the contact area between the base and the support ring, thereby improving the sealing between the base and the support ring, and preventing the water sample from flowing out from between the base and the support ring and between the base and the holder. The water sample flows from the sampling cylinder into the holder, and the feeding pump pumps the water sample into the digestion cylinder through the suction port and the material pipe.

[0006] A middle tube is installed in the middle of the lower end of the sampling tube, and the height of the middle tube is lower than that of the sampling tube. The through groove is composed of three cylindrical grooves with successively increasing diameters. The cylindrical groove with a small diameter is connected to the interior of the sampling tube. A sealing plate is slidably installed in the cylindrical groove in the middle, and a pressure spring is installed between the sealing plate and the cylindrical groove with a large diameter. A plurality of through holes are arranged around the pressure spring at the lower end of the through groove. An upper push cylinder is installed in the middle position of the base inside the detection box, and the central axis is slidably connected to the filter. The central axis is located directly above the upper push cylinder, and the outer diameter of the central axis is equal to the inner diameter of the middle tube. When the pressure spring is located between the sealing plate and the cylindrical groove with a large diameter, it is in an incompletely compressed state. The pressure exerted by the water sample in the sampling cylinder on the sealing plate is less than the elastic force exerted by the pressure spring on the sealing plate. When there is a water sample in the sampling cylinder, the sealing plate and the pressure spring cooperate with each other to seal and open the through groove. When blocked, the water sample will not flow out of the sampling cylinder from the through groove. After the sampling cylinder is placed on the holder, the upper push cylinder pushes the central axis into the middle tube to seal the middle tube. Then the feeding pump draws air from the holder through the material pipe to reduce the air pressure in the holder. When the pressure inside and outside the sampling cylinder is unbalanced, coupled with the pressure of the water sample on the sealing plate, the pressure spring is compressed, causing the sealing plate to open the through groove, and the water sample flows out of the through groove and flows into the holder through the filter screen. The feeding pump draws the water sample and pumps it into the digestion cylinder. When the sampling tube needs to be removed from the holder, the upper push cylinder pulls the central axis out of the middle tube, so that the inside of the sampling tube is connected to the internal space of the holder, so that the air pressure inside and outside the sampling tube is consistent, and the sealing plate is reset under the support of the pressure spring. The middle tube divides the internal space of the sampling tube into a storage bin and a liquid inlet channel. When the sampling tube collects water samples, the water samples enter the storage bin through the liquid inlet channel. When enough water samples are collected, the water samples exceeding the middle tube and the water samples inside the middle tube flow back in the process of lifting the sampling tube. The refluxed water samples rinse the filter screen and clean the impurities remaining on the filter screen.

[0007] The base is provided with four release blocks, which are triangular pyramid structures, one end of which is attached to the outside of the sampling tube, and the end face of the release block close to the buckle is an arc surface, and a rounded corner is provided below the end of the buckle close to the base. The side length of one end of the release block is equal to the distance from the outer diameter of the base to the outer diameter of the sampling tube. When the sampling tube needs to be removed from the holder, the sampling tube is rotated by the handle so that the release block is inserted from the rounded corner position at the lower end of the buckle. As the sampling tube rotates continuously, the release block detaches the buckle from the base through the continuous arc surface and the increasing diameter, and pushes the buckle into the card slot, and then the sampling tube is extracted upward to separate the sampling tube from the holder.

[0008] Two symmetrical slideways are arranged inward from the outside of the sampling cylinder, the handle is "C"-shaped, and the two ends of the handle are "L"-shaped and are respectively located in the two slideways, a support spring is vertically installed between the "L" end of the handle and the slideway, a bellows is sleeved on the outside of the support spring, the bellows is sealedly connected to the "L" end of the handle and the upper end of the slideway, an air bin protruding outward is arranged in the middle of the upper end of the handle, a piston bin is arranged inside the "L" of the handle, the air bin is connected with the piston bin through an airway arranged on the handle, a piston groove extends outward from one end of the piston bin, a pin is slidably installed inside the piston bin and the piston groove, two clamping plates are slidably installed on the base through springs, and a hemispherical protrusion is arranged at the position of the clamping plate corresponding to the piston groove, and the diameter of the protrusion is equal to the diameter of the active The inner diameter of the plug slot; the air chamber is composed of a rubber layer and a handle, air is stored in the air chamber, and the card plate is connected to the handle through a hemispherical protrusion. When the handle is not extended on the sampling cylinder, the protrusion on the card plate is embedded in the piston groove, and the pin is located in the piston chamber and the piston groove and is not affected by air pressure. At this time, the support spring and the bellows are in a stretched state, and the inside of the bellows is at a low pressure. When the handle needs to be extended on the sampling cylinder, the air chamber is pressed to make the air in the air chamber flow into the piston chamber, and the pin moves into the piston groove under the pressure of the air, squeezing the protrusion out of the piston groove. When the protrusion is squeezed out of the piston groove, the support spring resets and the bellows contracts, causing the handle to slide on the sampling cylinder, making the overall length of the handle and the sampling cylinder longer, which can reduce the bending angle of the sampler when sampling with the sampling cylinder.

[0009] An annular mounting groove is provided on the inner side of the base, the aperture is located in the mounting groove, the aperture includes a fixed shell, a driving disk rotatably installed inside the fixed shell, and a driving shell sleeved on the outer side of the fixed shell, aperture blades are installed between the driving disk and the fixed shell, two paddles and a plurality of slide grooves are provided on the driving disk, the pins on the aperture blades are located in the slide grooves, the driving disk is connected to the driving shell through the paddles, two driving tubes are installed on the outer side of the driving shell, one end of the driving tube is fixed on the mounting groove, the driving tube is composed of a spring and a bellows, and the internal space of the driving tube is connected to the space inside the supporting spring through a hose. When the hemispherical protrusion is located in the piston groove, the support spring is in a stretched state, the inner side of the support spring is in a low-pressure state, the drive tube is in a compressed state, and the inside of the drive tube is at low pressure. At this time, the aperture blades of the aperture extend out of the fixed shell and contact the central axis. When the hemispherical protrusion is removed from the piston groove, under the overall weight of the sampling tube and the base, the support spring is in a compressed state, the air pressure inside the support spring is greater than normal pressure, the air pressure inside the drive tube is greater than normal pressure, and the spring of the drive tube is in a normal state. During the resetting process of the drive tube, the drive shell is driven to rotate, and then the drive shell drives the drive disk to rotate through the paddle, so that the aperture blades are retracted into the fixed shell, so that the internal space of the sampling tube is connected with the external space. When the sampling cylinder is removed from the holder and used for sampling, the discharge pump extracts air in the sampling cylinder through the holder, making the air pressure in the sampling cylinder low pressure, and then presses the handle downward to make the hemispherical protrusion embed into the piston groove, so that the support spring is in a stretched state, and the bellows sleeved on the outside of the support spring is stretched, the internal air pressure is reduced, and then the internal air pressure of the drive tube is reduced, and the drive tube is compressed under the air pressure, and the drive tube drives the drive shell to rotate, and the drive disk is driven by the drive shell to extend the aperture blades out of the fixed shell, so that the aperture blades are in contact with the outer surface of the central axis, and the internal space of the sampling cylinder is separated from the external space.

[0010] The digestion tube is a double-layer structure, and a heat insulation layer and a metal tube are installed in the interlayer space of the digestion tube. Two different types of semiconductors are installed at the upper and lower ends of the metal tube. The semiconductor connection control system, the inner wall of the digestion tube is provided with a threaded shell 36 outward, and a partition and a bearing plate are provided inside the detection box. The position corresponding to the sampling tube is provided with a perforation on the partition, and the bearing plate is located below the partition and above the digestion tube. The sampling mechanism includes a delivery pipe and a sampling motor, and the sampling motor is installed on the bearing plate through a bracket. One end of the delivery pipe is inserted into the digestion tube, and the other end of the delivery pipe passes through the bearing plate and is connected with a dropper. A screw is installed in the delivery pipe, and one end of the screw is connected to the output shaft of the sampling motor. The dropper drops the doped water sample into the spectral analysis and determination system. The heat insulation layer is used to isolate the external heat from being transferred to the inside of the digestion tube, and also isolates the heat of the digestion tube from being transferred to the outside. The threaded shell 36 increases the contact area between the digestion tube and the water sample. The metal cylinder cooperates with the upper and lower semiconductors and uses the Peltier effect to dissipate heat or absorb heat. The heat emitted heats the dosing water sample inside the digestion cylinder, and the heat absorption is used to cool the water sample after digestion inside the digestion cylinder. After the dosing water sample is cooled, the sampling motor drives the screw to rotate, and the screw and the conveying tube cooperate with each other to lift the dosing water sample, so that the dosing water sample flows upward in the conveying tube and enters the dropper, and finally drips onto the spectral analysis and measurement system through the dropper.

[0011] The conveying pipe includes an outer tube located outside the digestion cylinder and a stirring sleeve located inside the digestion cylinder. The upper end of the stirring sleeve extends out of the digestion cylinder and is provided with a connecting ring. One end of the outer tube is dynamically sealed with the connecting ring. The screw includes a threaded rod and a short shaft. The short shaft is serially connected to the threaded rod. The short shaft is located in the connecting ring. The diameter of the short shaft is smaller than the diameter of the threaded rod. A sleeve is installed in the connecting ring. A ratchet structure is provided between the connecting ring and the sleeve. A plurality of flat keys are provided on the outer side of the short shaft and the inner side of the sleeve. The thickness of the flat key is smaller than the distance between two adjacent flat keys. A plurality of stirring blades are provided on the outer spiral of the stirring sleeve. A sealing plug is provided on the upper end of the outer tube. The sealing plug is located between the outer tube and the threaded rod. During sampling, the sampling motor drives the threaded rod to rotate forward, and the threaded rod drives the short shaft to rotate. When the short shaft drives the sleeve to rotate, the sleeve and the connecting ring are provided with a ratchet structure, and the resistance of the dosing water sample to the stirring piece and the stirring sleeve shell and the friction between the connecting ring and the digestion cylinder cause the connecting ring to not rotate. The entire threaded rod rotates in the outer tube and the stirring sleeve shell. The dosing water sample is first extracted to the sleeve by the threaded rod. As the dosing water sample accumulates in the sleeve, the dosing water sample passes over the short shaft and is extracted by the threaded rod again, and finally the dosing water sample flows out of the dropper. By extracting the dosing water sample through the threaded rod, the extraction amount of the dosing water sample can be accurately controlled. After the agent is added to the water sample, when stirring the dosing water sample, the sampling motor drives the threaded rod to reverse, the threaded rod drives the short shaft to rotate, the short shaft drives the sleeve to rotate through the flat key, the sleeve uses the ratchet structure to drive the connecting ring to rotate, the connecting ring drives the stirring sleeve shell to rotate, and the stirring piece stirs the dosing water sample driven by the stirring sleeve shell. When the dosing water sample is stirred, the threaded shell on the inner wall of the digestion cylinder blocks the rotation of the dosing water sample, so that the dosing water sample generates turbulence near the inner wall of the digestion cylinder, thereby accelerating the mixing efficiency of the dosing water sample near the inner wall of the digestion cylinder.

[0012] A monitoring method using an online water quality monitoring device for heavy metal mercury, the monitoring method comprising the following steps:

[0013] S1, collecting water samples; taking out the sampling cylinder from the detection box, using the sampling cylinder to sample the water sample to be tested, filtering the water sample, when lifting the sampling cylinder, part of the refluxed water sample in the sampling cylinder backwashes the filter, and putting the sampling cylinder into the detection box;

[0014] S2, the water sample is mixed with the reagent to form a doped water sample; the feeding pump pumps the water sample in the sampling cylinder into the digestion cylinder, the solution pump pumps the reagent into the digestion cylinder, the sampling motor drives the stirring sleeve to rotate by the screw, and the stirring piece stirs the doped water sample driven by the stirring sleeve;

[0015] S3, heating the doped water sample; the metal cylinder cooperates with the upper and lower semiconductors and uses the Peltier effect to dissipate heat, and the heat emitted heats the doped water sample inside the digestion cylinder;

[0016] S4, cooling the doped water sample; the metal cylinder cooperates with the upper and lower semiconductors and uses the Peltier effect to absorb heat, absorb the heat of the digestion cylinder, and realize cooling the doped water sample inside the digestion cylinder;

[0017] S5, sampling; the sampling motor drives the screw to rotate, and the screw and the delivery tube cooperate with each other to deliver the dosing water sample in step S4 to the dropper, and the dropper drops the dosing water sample on the spectral analysis measurement system;

[0018] S6. Determination. The spectral analysis and determination system determines the mercury content of the doped water sample, and the spectral analysis and determination system feeds back the analysis and determination results to the control system, which displays the determination results through a panel to achieve online monitoring of the mercury content.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] 1. When the sampling tube collects water samples, the filter screen filters the water samples, and the water samples enter the storage bin through the liquid inlet channel. When enough water samples are collected, the water samples exceeding the middle tube and the water samples inside the middle tube flow back during the sampling tube is lifted. The backflowing water samples rinse the filter screen and clean the impurities remaining on the filter screen.

[0021] 2. The sampling mechanism transports the dosing water sample inside the digestion cylinder to the spectral analysis and determination system, which determines the mercury content of the dosing water sample. The spectral analysis and determination system is electrically connected to the control system inside the panel. The spectral analysis and determination system feeds back the analysis and determination results to the control system, which displays the determination results through the panel to achieve online monitoring of the mercury content.

[0022] 3. When sampling, the sampling motor drives the screw to rotate forward, and the screw and the conveying tube cooperate with each other to sample the doped water sample and convey the doped water sample to the dropper; when mixing and stirring the doped water sample, the sampling motor drives the screw to rotate in the reverse direction, and the screw drives the conveying tube and the stirring blade to rotate, and the doped water sample is mixed by the stirring blade. Through the setting of the sampling motor, the screw and the conveying tube, the sampling of the doped water sample and the mixing and stirring of the doped water sample are realized by using the forward and reverse rotation, and the same mechanism has two different functions, and the two functions are realized by using one sampling motor, which saves the design of multiple drive sources and reduces the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention;

[0025] Figure 2 is a three-dimensional diagram of the present invention after removing the protective cover;

[0026] Figure 3 It is a front cross-sectional view of the overall structure of the present invention;

[0027] Figure 4 The present invention Figure 3 A partial enlarged view of the middle A area;

[0028] Figure 5 It is a stereoscopic diagram of the feeding pump of the present invention connected with the sampling cylinder and the digestion cylinder;

[0029] Figure 6 It is a three-dimensional diagram of the connection base of the feeding pump of the present invention;

[0030] Figure 7 It is a three-dimensional diagram of the connection between the sampling tube and the card holder of the present invention;

[0031] Figure 8 It is a cross-sectional view of the connection between the sampling tube and the holder of the present invention;

[0032] Fig. 9 is an exploded view of the aperture of the present invention;

[0033] Fig.10 It is a cross-sectional view of the interior of the digestion tube of the present invention.

[0034] In the figure: 1. detection box; 2. protective cover; 3. panel; 4. partition; 5. sampling tube; 6. handle; 7. holder; 8. buckle; 9. push cylinder; 10. digestion tube; 11. threaded rod; 12. sampling motor; 13. dropper; 14. reagent tube; 15. feeding pump; 16. sealing plate; 17. filter; 18. pressure spring; 19. solution box; 20. solution pump; 21. bracket; 22. support ring; 23. material tube; 24. Outer tube; 25. Connecting ring; 26. Release block; 27. Card plate; 28. Air chamber; 29. ​​Middle tube; 30. Base; 31. Middle axis; 32. Aperture; 33. Support spring; 34. Release pin; 35. Insulation layer; 36. Threaded shell; 37. Agitator blade; 38. Short shaft; 39. Sleeve; 40. Agitator shell; 41. Drive shell; 42. Drive tube; 43. Fixed shell; 44. Drive disk; 45. Aperture blade; 46. Pin. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] See also Figure 1-Figure 10 The present invention provides a technical solution: an online water quality monitoring device for heavy metal mercury, including a spectral analysis and measurement system, a detection box 1, a protective cover 2 and a panel 3 are installed above the detection box 1, a removable sampling tube 5, a digestion tube 10, a solution box 19 and a feeding pump 15 are installed inside the detection box 1, a partition 4 and a bearing plate are installed inside the detection box 1, a perforation is set on the partition 4 at a position corresponding to the sampling tube 5, the panel 3 is installed on the partition 4, a control system is arranged in the panel 3, the control system is electrically connected to the spectral analysis and measurement system, and the bearing plate Located below the partition 4 and above the digestion cylinder 10, a card seat 7 is arranged inside the detection box 1, a support ring 22 is installed on the inner side of the card seat 7, at least two suction ports are arranged on the card seat 7, the feeding pump 15 is connected to the suction port through a material pipe 23, the upper end surface of the support ring 22 is an arc surface, the inner diameter of the card seat 7 is equal to the outer diameter of the base 30, at least four card slots are arranged above the card seat 7, a buckle 8 is installed in the card slot through a spring sliding, the buckle 8 is "Z" shaped, a rounded corner is arranged above one end of the buckle 8, and the buckle 8 fixes the base 30 in the card seat 7;

[0037] A base 30 is provided below the sampling tube 5, and an arc-shaped groove is provided on the outer side of the lower end of the base 30. The sampling tube 5 is placed in the holder 7 through the base 30. The base 30 will contact the rounded corner of the upper end of the buckle 8 during the placement process. The arc-shaped groove at the lower end of the base 30 cooperates with the rounded corner to push the buckle 8 out of the movement path of the base 30. After the base 30 moves to the inside of the holder 7 and contacts the support ring 22, the buckle 8 is reset by the spring and snapped on the top of the base 30 to fix the position of the base 30.

[0038] Four tripping blocks 26 are arranged on the base 30. The tripping blocks 26 are triangular pyramid structures. One end surface of the tripping block 26 is attached to the outside of the sampling tube 5. The end surface of the tripping block 26 close to the buckle 8 is an arc surface. A rounded corner is arranged below the end of the buckle 8 close to the base 30. The side length of one end of the tripping block 26 is equal to the distance from the outer diameter of the base 30 to the outer diameter of the sampling tube 5.

[0039] A middle tube 29 is installed in the middle part of the lower end of the sampling tube 5. The height of the middle tube 29 is lower than that of the sampling tube 5. A through groove is arranged at the lower end of the sampling tube 5. The through groove is composed of three cylindrical grooves with successively increasing diameters. The cylindrical groove with a small diameter is connected to the interior of the sampling tube 5. A sealing plate 16 is slidably installed in the cylindrical groove located in the middle. A pressure spring 18 is installed between the sealing plate 16 and the cylindrical groove with a large diameter. When the pressure spring 18 is located between the sealing plate 16 and the cylindrical groove with a large diameter, it is in an incompletely compressed state. The pressure applied by the water sample in the sampling tube 5 to the sealing plate 16 is less than the elastic force applied by the pressure spring 18 to the sealing plate 16. A plurality of through holes are arranged around the pressure spring 18 at the lower end of the through groove. An upper push cylinder 9 is installed in the middle position of the card seat 7 inside the detection box 1. The central axis 31 is slidably connected to the filter screen 17. The central axis 31 is located directly above the upper push cylinder 9. The outer diameter of the central axis 31 is equal to the inner diameter of the middle tube 29.

[0040] A handle 6 is installed on the sampling cylinder 5. Two symmetrical slideways are arranged inward from the outside of the sampling cylinder 5. The handle 6 is "C"-shaped. The two ends of the handle 6 are "L"-shaped and are respectively located in the two slideways. A support spring 33 is vertically installed between the "L" end of the handle 6 and the slideway. A bellows is sleeved on the outside of the support spring 33. The bellows is sealed and connected to the "L" end of the handle 6 and the upper end of the slideway. An air bin 28 protruding outward is arranged in the middle of the upper end of the handle 6. The air bin 28 is composed of a rubber layer and the handle 6. Air is stored in the air bin 28. A piston bin is arranged inside the "L" of the handle 6. The air bin 28 is connected to the piston bin through an air channel arranged on the handle 6. A piston groove extends outward from one end of the piston bin. A release pin 34 is slidably installed inside the piston bin and the piston groove. Two clamping plates 27 are slidably installed on the base 30 through springs (not shown in the figure). The clamping plates A hemispherical protrusion is provided at the position corresponding to the piston groove 27, and the diameter of the protrusion is equal to the inner diameter of the piston groove; the card plate 27 is connected with the handle 6 through the hemispherical protrusion. When the handle 6 is not extended on the sampling tube 5, the protrusion on the card plate 27 is embedded in the piston groove, and the pin 34 is located in the piston chamber and the piston groove and is not affected by air pressure. At this time, the support spring 33 and the bellows are both in a stretched state, and the inside of the bellows is at a low pressure. When the handle 6 needs to be extended on the sampling tube 5, the air chamber 28 is pressed to make the air in the air chamber 28 flow into the piston chamber, and the pin 34 moves into the piston groove under the pressure of the air, squeezing the protrusion out of the piston groove. When the protrusion is squeezed out of the piston groove, the support spring 33 is reset and the bellows contracts, so that the handle 6 slides on the sampling tube 5, so that the overall length of the handle 6 and the sampling tube 5 becomes longer, which can reduce the bending angle of the sampling personnel when sampling with the sampling tube 5.

[0041] An annular mounting groove is provided on the inner side of the base 30, and the aperture 32 is located in the mounting groove. A filter screen 17 is installed on the inner side of the base 30, and the aperture 32 is located below the filter screen 17. A central axis 31 is installed in the middle of the filter screen 17. A driving mechanism is provided on the sampling tube 5, and the driving mechanism provides power for the aperture 32. The aperture 32 and the central axis 31 cooperate with each other to control the flow of the water sample. The aperture 32 controls the size of the flow channel cross-sectional area when the water sample flows.

[0042] The aperture 32 includes a fixed shell 43, a driving disk 44 rotatably installed inside the fixed shell 43, and a driving shell 41 sleeved on the outside of the fixed shell 43. An aperture blade 45 is installed between the driving disk 44 and the fixed shell 43. Two paddles and a plurality of slide grooves are provided on the driving disk 44. The pin shaft 46 on the aperture blade 45 is located in the slide groove. The driving disk 44 is connected to the driving shell 41 through the paddle. Two driving tubes 42 are installed on the outside of the driving shell 41. One end of the driving tube 42 is fixed on the mounting groove. The driving tube 42 is composed of a spring and a bellows. The internal space of the driving tube 42 is connected to the space inside the support spring 33 through a hose.

[0043] A solution pump 20 is installed on the solution tank 19, and the output end of the solution pump 20 is connected to the reagent tube 14. The solution pump 20 pumps the solution (medicine or clean water) in the solution tank 19 into the digestion tube 10 through the reagent tube 14. The digestion tube 10 is installed with a sampling mechanism, and the sampling mechanism transports the doped water sample inside the digestion tube 10 to the spectral analysis and determination system, and the spectral analysis and determination system determines the mercury content of the doped water sample. In addition to storing the reagent, the solution tank 19 also stores clean water. The solution tank 19 is connected to a cleaning pump through a pipeline. The cleaning pump extracts clean water and infuses it into the digestion tube 10 and the holder 7. The feeding pump 15 extracts clean water from the holder 7 for self-cleaning. A sewage pipe is connected to one side of the lower end of the digestion tube 10, and the sewage pipe is connected in series with a valve. The water after the digestion tube 10 and the water after the feeding pump 15 are cleaned flow out of the equipment through the sewage pipe.

[0044] The digestion cylinder 10 is a double-layer structure. A heat insulation layer 35 and a metal cylinder are installed in the interlayer space of the digestion cylinder 10. Two different types of semiconductors are installed at the upper and lower ends of the metal cylinder. The semiconductors are connected to the control system. A threaded shell 36 is arranged on the inner wall of the digestion cylinder 10.

[0045] The sampling mechanism includes a delivery pipe and a sampling motor 12. The sampling motor 12 is installed on a supporting plate through a bracket 21. The delivery pipe includes an outer tube 24 located outside the digestion tube 10 and a stirring shell 40 located inside the digestion tube 10. The upper end of the stirring shell 40 extends out of the digestion tube 10 and is provided with a connecting ring 25. One end of the outer tube 24 is dynamically sealed with the connecting ring 25. The outer tube 24 passes through the supporting plate and is connected with a dropper 13. A screw is installed in the delivery pipe. The screw includes a threaded rod 11 and a short shaft 38. The short shaft 38 is connected in series to the threaded rod 11. The short shaft 38 is located in the connecting ring 25. The diameter of the short shaft 38 is smaller than the diameter of the threaded rod 11. One end of the threaded rod 11 is connected to the output shaft of the sampling motor 12. The dropper 13 drops the doped water sample into the spectral analysis and measurement system.

[0046] The heat insulation layer 35 is used to isolate the external heat from being transferred to the inside of the digestion tube 10, and also to isolate the heat of the digestion tube 10 from being transferred to the outside. The threaded shell 36 increases the contact area between the digestion tube 10 and the water sample. The metal tube cooperates with the upper and lower semiconductors and uses the Peltier effect to dissipate heat or absorb heat. The heat dissipation heats the doped water sample inside the digestion tube 10, and the heat absorption is used to cool the water sample after digestion inside the digestion tube 10. After the doped water sample is cooled, the sampling motor 12 drives the screw to rotate, and the screw and the conveying tube cooperate with each other to achieve the lifting of the doped water sample, so that the doped water sample flows upward in the conveying tube and enters the dropper 13, and finally drips onto the spectral analysis and measurement system through the dropper 13.

[0047] A sleeve 39 is installed in the connecting ring 25, and a ratchet structure is arranged between the connecting ring 25 and the sleeve 39. A plurality of flat keys are arranged on the outer side of the short shaft 38 and the inner side of the sleeve 39. The thickness of the flat key is less than the distance between two adjacent flat keys. A plurality of stirring blades 37 are arranged on the outer spiral of the stirring sleeve 40. A sealing plug is arranged on the upper end of the outer tube 24, and the sealing plug is located between the outer tube 24 and the threaded rod 11.

[0048] A method for online monitoring of water quality of heavy metal mercury, the monitoring method comprising the following steps:

[0049] S1, collecting water samples; taking out the sampling cylinder from the detection box, using the sampling cylinder to sample the water sample to be tested, filtering the water sample, when lifting the sampling cylinder, part of the refluxed water sample in the sampling cylinder backwashes the filter, and putting the sampling cylinder into the detection box;

[0050] S2, the water sample is mixed with the reagent to form a doped water sample; the feeding pump pumps the water sample in the sampling cylinder into the digestion cylinder, the solution pump pumps the reagent into the digestion cylinder, the sampling motor drives the stirring sleeve to rotate by the screw, and the stirring piece stirs the doped water sample driven by the stirring sleeve;

[0051] S3, heating the doped water sample; the metal cylinder cooperates with the upper and lower semiconductors and uses the Peltier effect to dissipate heat, and the heat emitted heats the doped water sample inside the digestion cylinder;

[0052] S4, cooling the doped water sample; the metal cylinder cooperates with the upper and lower semiconductors and uses the Peltier effect to absorb heat, absorb the heat of the digestion cylinder, and realize cooling the doped water sample inside the digestion cylinder;

[0053] S5, sampling; the sampling motor drives the screw to rotate, and the screw and the delivery tube cooperate with each other to deliver the dosing water sample in step S4 to the dropper, and the dropper drops the dosing water sample on the spectral analysis measurement system;

[0054] S6. Determination. The spectral analysis and determination system determines the mercury content of the doped water sample, and the spectral analysis and determination system feeds back the analysis and determination results to the control system, which displays the determination results through a panel to achieve online monitoring of the mercury content.

[0055] Working principle of the present invention:

[0056] When it is necessary to collect water samples, the protective cover 2 is opened, the sampling tube 5 is removed from the holder 7 and used for sampling, and the handle 6 is pressed downward to embed the hemispherical protrusion into the piston groove, so that the support spring 33 is in a stretched state, and the bellows sleeved on the outside of the support spring 33 is stretched, the internal air pressure is reduced, and then the internal air pressure of the driving tube 42 is reduced. Under the air pressure, the driving tube 42 is compressed, and the driving tube 42 drives the driving shell 41 to rotate. Driven by the driving shell 41, the driving disk 44 extends the aperture blades 45 out of the fixed shell 43, so that the aperture blades 45 contact the outer surface of the central axis 31, and the internal space of the sampling tube 5 is separated from the external space.

[0057] The sampling tube 5 is rotated by the handle 6, so that the release block 26 is inserted from the rounded position of the lower end of the buckle 8. As the sampling tube 5 continues to rotate, the release block 26 disengages the buckle 8 from the base 30 through the continuous arc surface and the increasing diameter, and pushes the buckle 8 into the card slot, and then the sampling tube 5 is extracted upward to separate the sampling tube 5 from the card seat 7. The sampling tube 5 located in the detection box 1 is taken out by the handle 6, and the lower end of the sampling tube 5 is immersed in the water sample to be sampled, and the air chamber 28 is pressed to make the air in the air chamber 28 flow into the piston chamber. The release pin 34 moves into the piston groove under the pressure of the air, and the protrusion is squeezed out of the piston groove. When the protrusion is squeezed out of the piston groove, the support spring 33 is reset and the bellows is contracted, so that the handle 6 slides on the sampling tube 5, so that the overall length of the handle 6 and the sampling tube 5 is lengthened, which can reduce the bending angle of the sampling personnel when using the sampling tube 5 to collect samples.

[0058] When the hemispherical protrusion moves out of the piston groove, under the overall weight of the sampling tube 5 and the base 30, the support spring 33 is in a compressed state, the air pressure inside the support spring 33 is greater than the normal pressure, the air pressure inside the drive tube 42 is greater than the normal pressure, and the spring of the drive tube 42 is in a normal state. During the reset process of the drive tube 42, the drive shell 41 is driven to rotate, and then the drive shell 41 drives the drive disk 44 to rotate through the paddle, so that the aperture blades 45 are retracted into the fixed shell 43, so that the internal space of the sampling tube 5 is connected with the external space. The water sample passes through the filter screen 17 and enters the sampling tube 5 through the middle tube 29. When enough water samples are collected, the sampling tube 5 is lifted, and the water samples exceeding the middle tube 29 and the water samples inside the middle tube 29 flow back. The refluxed water samples wash the filter screen 17 and wash away the impurities remaining on the filter screen 17.

[0059] After the sampling cylinder 5 collects the water sample, the sampling cylinder 5 is put into the detection box 1 again, and the sampling cylinder 5 is placed in the holder 7 through the base 30. The base 30 will contact the upper rounded corner of the buckle 8 during the placement process. The arc-shaped groove at the lower end of the base 30 cooperates with the rounded corner to push the buckle 8 out of the movement path of the base 30. After the base 30 moves to the inside of the holder 7 and contacts the support ring 22, the buckle 8 is reset by the spring and snapped on the top of the base 30 to fix the position of the base 30, and then the protective cover 2 is covered.

[0060] After the sampling tube 5 is placed on the holder 7, the upper push cylinder 9 pushes the central axis 31 into the middle tube 29 to seal the middle tube 29. Then the feeding pump 15 extracts the air in the holder 7 through the material pipe 23 to reduce the air pressure in the holder 7. When the pressure inside and outside the sampling tube 5 is unbalanced, the pressure of the water sample on the sealing plate 16 causes the pressure spring 18 to be compressed, causing the sealing plate 16 to open the through groove. The water sample flows out of the through groove and flows into the holder 7 through the filter screen 17. The feeding pump 15 extracts the water sample and pumps it into the digestion tube 10. The feeding pump 15 pumps the water sample in the sampling cylinder 5 into the digestion cylinder 10, and the solution pump 20 pumps the agent into the digestion cylinder 10. After the agent is added to the water sample, when the dosing water sample is stirred, the sampling motor 12 drives the threaded rod 11 to reverse, the threaded rod 11 drives the short shaft 38 to rotate, the short shaft 38 drives the sleeve 39 to rotate through the flat key, the sleeve 39 drives the connecting ring 25 to rotate by the ratchet structure, the connecting ring 25 drives the stirring sleeve 40 to rotate, and the stirring blade 37 stirs the dosing water sample driven by the stirring sleeve 40. When the dosing water sample is stirred, the threaded shell on the inner wall of the digestion cylinder 10 blocks the rotation of the dosing water sample, so that the dosing water sample generates turbulence near the inner wall of the digestion cylinder 10, and accelerates the mixing efficiency of the dosing water sample near the inner wall of the digestion cylinder 10. The reagent and the water sample are mixed, and the metal cylinder cooperates with the upper and lower semiconductors to dissipate heat using the Peltier effect. The heat dissipation heats the reagent-doped water sample inside the digestion cylinder 10. After the temperature and time corresponding to the processing heat are reached, the reagent-doped water sample is cooled down.

[0061] The sampling mechanism samples the dosing water sample after the digestion cylinder 10 is cooled and sent to the spectral analysis system for measurement and analysis. During sampling, the sampling motor 12 drives the threaded rod 11 to rotate forward, and the threaded rod 11 drives the short shaft 38 to rotate. When the short shaft 38 drives the sleeve 39 to rotate, the sleeve 39 and the connecting ring 25 are provided with a ratchet structure, and the resistance of the dosing water sample to the stirring piece 37 and the stirring sleeve 40 and the friction between the connecting ring 25 and the digestion cylinder 10 cause the connecting ring 25 not to rotate. The entire threaded rod 11 rotates in the outer tube 24 and the stirring sleeve 40. The dosing water sample is first extracted by the threaded rod 11 to the sleeve 39. As the dosing water sample accumulates in the sleeve 39, the dosing water sample passes over the short shaft 38 and is extracted again by the threaded rod 11, and finally the dosing water sample flows out from the dropper 13. The outflowing doped water sample drops onto the spectral analysis and measurement system, and the spectral analysis and measurement system feeds back the analysis and measurement results to the control system. The control system displays the measurement results through the panel to realize online monitoring of the mercury content.

[0062] After the measurement is completed, the protective cover 2 can be opened, and the upper push cylinder 9 can be used to pull the central axis 31 out of the central tube 29, so that the interior of the sampling tube 5 is connected to the internal space of the holder 7, so that the air pressure inside and outside the sampling tube 5 is consistent, and the sealing plate 16 is reset under the support of the pressure spring 18. The handle 6 is pressed downward to make the hemispherical protrusion embed into the piston groove, so that the support spring 33 is in a stretched state, the bellows sleeved outside the support spring 33 is stretched, the internal air pressure is reduced, and then the internal air pressure of the driving tube 42 is reduced. Under the air pressure, the driving tube 42 is compressed, and the driving tube 42 drives the driving shell 41 to rotate. Driven by the driving shell 41, the driving disk 44 extends the aperture blades 45 out of the fixed shell 43, so that the aperture blades 45 contact the outer surface of the central axis 31, and the internal space of the sampling tube 5 is separated from the external space.

[0063] The solution tank 19 is connected to a cleaning pump through a pipeline. The cleaning pump draws clean water and injects it into the digestion cylinder 10 and the holder 7. The feeding pump 15 draws clean water from the holder 7 for self-cleaning. A drain pipe is connected to one side of the lower end of the digestion cylinder 10. The drain pipe is connected in series with a valve. The water after cleaning the digestion cylinder 10 and the water after cleaning the feeding pump 15 flow out of the equipment through the drain pipe.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0065] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An online water quality monitoring device for heavy metal mercury, including a spectral analysis and measurement system, characterized in that: The monitoring device comprises a detection box (1), a protective cover (2) and a panel (3) are installed above the detection box (1), a removable sampling cylinder (5) and a digestion cylinder (10) are installed inside the detection box (1), a solution box (19) and a loading pump (15) are installed inside the detection box (1), the loading pump (15) pumps the water sample in the sampling cylinder (5) into the digestion cylinder (10), a solution pump (20) is installed on the solution box (19), the solution pump (20) transports the solution in the solution box (19) into the digestion cylinder (10) through the reagent tube (14), a sampling mechanism is installed on the digestion cylinder (10), the sampling mechanism transports the doped water sample in the digestion cylinder (10) to the spectral analysis and measurement system, the spectral analysis and measurement system performs mercury content measurement on the doped water sample, and the spectral analysis and measurement system is electrically connected to the control system inside the panel (3); The sampling tube (5) is provided with a handle (6), a base (30) is provided below the sampling tube (5), a through slot is provided at the lower end of the sampling tube (5), a filter (17) and an aperture (32) are provided inside the base (30), the aperture (32) is located below the filter (17), a central axis (31) is provided in the middle of the filter (17), a driving mechanism is provided on the sampling tube (5), the driving mechanism provides power for the aperture (32), a holder (7) is provided inside the detection box (1), a support ring (2) is provided inside the holder (7), and a support ring (2) is provided inside the holder (7). 2), at least two suction ports are provided on the base (7), the feeding pump (15) is connected to the suction port via a material pipe (23), an arc-shaped groove is provided on the outer side of the lower end of the base (30), the upper end surface of the support ring (22) is an arc surface, the inner diameter of the base (7) is equal to the outer diameter of the base (30), at least four card slots are provided above the base (7), a card buckle (8) is slidably installed in the card slot via a spring, the card buckle (8) is "Z"-shaped, a rounded corner is provided above one end of the card buckle (8), and the card buckle (8) fixes the base (30) in the base (7); A middle tube (29) is installed in the middle of the lower end of the sampling tube (5), the height of the middle tube (29) is lower than the height of the sampling tube (5), the through groove is composed of three cylindrical grooves with increasing diameters, the cylindrical groove with a small diameter is connected to the inside of the sampling tube (5), a sealing plate (16) is slidably installed in the cylindrical groove located in the middle, a pressure spring (18) is installed between the sealing plate (16) and the cylindrical groove with a large diameter, and a plurality of through holes are arranged around the pressure spring (18) at the lower end of the through groove, an upper push cylinder (9) is installed in the middle position of the card seat (7) inside the detection box (1), the middle shaft (31) is slidably connected to the filter screen (17), the middle shaft (31) is located directly above the upper push cylinder (9), and the outer diameter of the middle shaft (31) is equal to the inner diameter of the middle tube (29); Two symmetrical slideways are arranged from the outside of the sampling cylinder (5) to the inside, the handle (6) is "C"-shaped, the two ends of the handle (6) are "L"-shaped and are respectively located in the two slideways, a support spring (33) is vertically installed between the "L" end of the handle (6) and the slideway, a bellows is sleeved on the outside of the support spring (33), the bellows is sealedly connected to the "L" end of the handle (6) and the upper end of the slideway, an air chamber (28) protruding outward is arranged in the middle of the upper end of the handle (6), a piston chamber is arranged inside the "L" of the handle (6), the air chamber (28) is connected to the piston chamber through an air channel arranged on the handle (6), a piston groove extends outward from one end of the piston chamber, and a release pin (34) is slidably installed inside the piston chamber and the piston groove, and two clamping plates (27) are slidably installed on the base (30) through springs, and the clamping plates (27) are provided with hemispherical protrusions at positions corresponding to the piston grooves, and the diameter of the hemispherical protrusions is equal to the inner diameter of the piston groove; An annular mounting groove is provided on the inner side of the base (30), the aperture (32) is located in the mounting groove, the aperture (32) comprises a fixed shell (43), a driving disk (44) rotatably mounted inside the fixed shell (43), and a driving shell (41) sleeved on the outer side of the fixed shell (43), an aperture blade (45) is installed between the driving disk (44) and the fixed shell (43), two paddles and a plurality of slide grooves are provided on the driving disk (44), a pin shaft (46) on the aperture blade (45) is located in the slide groove, the driving disk (44) is connected to the driving shell (41) via the paddles, two driving tubes (42) are installed on the outer side of the driving shell (41), one end of the driving tube (42) is fixed on the mounting groove, the driving tube (42) is composed of a spring and a bellows, and the inner space of the driving tube (42) is connected to the space inside the supporting spring (33) via a hose; The digestion tube (10) is a double-layer structure. A heat insulating layer (35) and a metal tube are installed in the interlayer space of the digestion tube (10). Two different types of semiconductors are installed at the upper and lower ends of the metal tube. The semiconductors are connected to a control system. A threaded shell (36) is arranged outwardly on the inner wall of the digestion tube (10). A partition (4) and a supporting plate are arranged inside the detection box (1). A perforation is arranged on the partition (4) at a position corresponding to the sampling tube (5). The supporting plate is located below the partition (4) and above the digestion tube (10). The sampling mechanism comprises a delivery pipe and a sampling motor (12). The sampling motor (12) is installed on the supporting plate through a bracket (21). One end of the delivery pipe is inserted into the digestion tube (10). The other end of the delivery pipe passes through the supporting plate and is connected to a dropper (13). A screw is installed in the delivery pipe. One end of the screw is connected to the output shaft of the sampling motor (12). The dropper (13) drops the doped water sample into the spectral analysis and measurement system. The delivery pipe comprises an outer pipe (24) located outside the digestion barrel (10) and a stirring casing (40) located inside the digestion barrel (10); the upper end of the stirring casing (40) extends out of the digestion barrel (10) and is provided with a connecting ring (25); one end of the outer pipe (24) is dynamically sealedly connected to the connecting ring (25); the screw comprises a threaded rod (11) and a short shaft (38); the short shaft (38) is serially connected to the threaded rod (11); the short shaft (38) is located in the connecting ring (25); the diameter of the short shaft (38) is smaller than that of the threaded rod (11); The connecting ring (25) is provided with a sleeve (39) which is equal to the diameter of the threaded rod (11). A ratchet structure is provided between the connecting ring (25) and the sleeve (39). A plurality of flat keys are provided on the outer side of the short shaft (38) and the inner side of the sleeve (39). The thickness of the flat keys is less than the distance between two adjacent flat keys. A plurality of stirring blades (37) are spirally provided on the outer side of the stirring sleeve (40). A sealing plug is provided at the upper end of the outer tube (24). The sealing plug is located between the outer tube (24) and the threaded rod (11).

2. The online water quality monitoring device for heavy metal mercury according to claim 1 is characterized by: Four release blocks (26) are arranged on the base (30), and the release blocks (26) are triangular pyramid structures. One end surface of the release block (26) is attached to the outside of the sampling tube (5), and the end surface of the release block (26) close to the buckle (8) is an arc surface. A rounded corner is arranged below one end of the buckle (8) close to the base (30).

3. A monitoring method using an online water quality monitoring device for heavy metal mercury according to any one of claims 1 to 2, characterized in that: The monitoring method comprises the following steps: S1. Collect water samples; S2, the water sample is mixed with the reagent to form a reagent-doped water sample; S3, heating the dosing water sample; S4, cooling the dosing water sample; S5. Sampling; S6. Determination.

4. The monitoring method according to claim 3, characterized in that: The specific steps of step S1 are: taking out the sampling cylinder from the detection box, using the sampling cylinder to sample the water sample to be tested, filtering the water sample through the filter screen, when the sampling cylinder is lifted, part of the refluxed water sample in the sampling cylinder backwashes the filter screen, and putting the sampling cylinder into the detection box; The specific steps of step S2 are: the feeding pump pumps the water sample in the sampling cylinder into the digestion cylinder, the solution pump pumps the reagent into the digestion cylinder, the sampling motor drives the stirring sleeve to rotate by the screw, and the stirring blade stirs the doped water sample driven by the stirring sleeve; The specific steps of step S3 are: the metal cylinder cooperates with the upper and lower semiconductors and uses the Peltier effect to dissipate heat, and the heat emitted heats the dosing water sample inside the digestion cylinder; The specific steps of step S4 are: the metal cylinder cooperates with the upper and lower semiconductors to absorb heat by using the Peltier effect, absorbing the heat of the digestion cylinder, and realizing cooling of the dosing water sample inside the digestion cylinder; The specific steps of step S5 are: the sampling motor drives the screw to rotate, the screw and the delivery tube cooperate with each other to deliver the dosing water sample in step S4 to the dropper, and the dropper drops the dosing water sample on the spectral analysis and measurement system; The specific steps of step S6 are: the spectral analysis and determination system determines the mercury content of the doped water sample, the spectral analysis and determination system feeds back the analysis and determination results to the control system, and the control system displays the determination results through the panel to realize online monitoring of the mercury content.

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