Marine water quality monitoring device

Abstract

The invention discloses a marine water quality monitoring device, belonging to the technical field of marine water quality monitoring equipment, comprising a lifting ring, a shell, a sampling mechanism, a depth adjustment mechanism and a medicine delivery mechanism, the shell comprising an upper plate, a side panel fixedly mounted on the upper plate, the lifting ring fixedly mounted on the side panel, an intermediate plate fixedly mounted on the inner side of the upper plate, the sampling mechanism comprising a sampling tank fixedly mounted on the intermediate plate, an intermediate tube fixedly mounted on the sampling tank, the intermediate tube being connected to the inside of the sampling tank, the depth adjustment mechanism comprising a water inlet pipe, a depth adjustment component and a water volume control component, the depth adjustment component being mounted on the inner side of the upper plate and located above the intermediate plate; a medicine barrel fixedly mounted on the inner side of the upper plate and located below the intermediate plate, the medicine delivery component being connected to a vertical tank and located below the intermediate plate, the medicine delivery component being connected to the medicine barrel, and the invention realizes automatic sampling of seawater at a specific depth.

Description

Technical Field

[0001] The invention relates to the technical field of marine water quality monitoring equipment, and in particular discloses a marine water quality monitoring device. Background Art

[0002] The ocean is the largest water resource on Earth, and it has a significant impact on human life and the ecosystem. In order to protect the marine environment and monitor marine water quality, seawater sampling devices for marine water quality monitoring are widely used. This device can collect seawater samples at different depths, locations, and times for analysis of water quality parameters, eutrophication, pollutant concentrations and other indicators.

[0003] The role and importance of marine water quality monitoring devices are reflected in the following aspects.

[0004] 1. Environmental assessment: By collecting seawater samples, we can assess the health of the marine ecosystem, monitor the concentration and distribution of pollutants, and provide data support for environmental protection and management.

[0005] 2. Research Science: Ocean water quality monitoring is the basis of marine scientific research. By collecting seawater samples, research in many fields such as marine biology, geochemistry, and climate change can be carried out.

[0006] 3. Resource management: Understanding the water quality of the ocean will help to scientifically manage and rationally utilize marine resources, protect fishery resources, and maintain the balance of marine ecology.

[0007] The development history of seawater sampling devices for marine water quality monitoring can be traced back to the simple water sampling devices used by early scientific research ships. With the advancement of science and technology, marine water quality monitoring devices have gradually realized automation, multi-parameter monitoring and telemetry functions, improving sampling efficiency and accuracy.

[0008] Seawater sampling devices for marine water quality monitoring play an important role in marine environmental protection and scientific research. With the continuous advancement of technology, the automation, multi-parameter monitoring and telemetry capabilities of sampling devices have been continuously improved, providing more accurate and comprehensive data support for marine water quality monitoring. The device has a wide range of applications and has made positive contributions to marine environmental protection, scientific research and resource management.

[0009] The patent with publication number CN115420558A discloses a seawater sampling device for monitoring marine water quality. The technical solution of the device is as follows: it includes a hull, a sampling tank and a push seat. A rope throwing chamber is provided in the middle of the hull, a clamping mechanism is provided on the rope throwing chamber, a reel is rotatably provided on the rope throwing chamber, a cable is wound on the reel, a plurality of clamping columns are sleeved on the cable, a hemispherical protrusion and a hemispherical groove are provided at both ends of the clamping column, an annular groove is provided in the middle of the clamping column, a metering mark is provided in the annular groove, the cable is connected to the top of the sampling tank, a plurality of valve holes are provided at the top and bottom of the sampling tank, valve stems are commonly penetrated in the aligned valve holes, a plurality of valve cores matching the valve holes are provided on the valve stem, a push seat is connected to the top of the valve stem, a spring is abutted between the push seat and the sampling tank to make the valve core abut in the valve hole, but the device cannot sample seawater at a specific depth, so a marine water quality monitoring device is invented to address this defect. Summary of the invention

[0010] In view of the above technical problems, the technical solution adopted by the present invention is: a marine water quality monitoring device, including a lifting ring, a shell, a sampling mechanism, a depth adjustment mechanism and a drug delivery mechanism, the shell includes an upper plate, the upper plate is fixedly installed with a side panel, the lifting ring is fixedly installed on the side panel, an intermediate plate is fixedly installed on the inner side of the upper plate, the sampling mechanism includes a sampling tank, the sampling tank is fixedly installed on the intermediate plate, an intermediate tube is fixedly installed on the sampling tank, and the intermediate tube is connected to the inside of the sampling tank.

[0011] The depth adjustment mechanism includes a water inlet pipe, a depth adjustment component and a water volume control component. The depth adjustment component is installed on the inner side of the upper plate and is located above the middle plate. The depth adjustment component is connected to the middle pipe. The water volume control component is installed inside the sampling tank and is located below the middle plate. The water volume control component is connected to the sampling tank.

[0012] The medicine delivery mechanism includes a medicine barrel, a medicine delivery tube, a vertical tank and a medicine delivery assembly. The vertical tank is connected to the sampling tank, the lower part of the sampling tank is connected to the medicine delivery tube, the medicine delivery tube is connected to the medicine barrel, the medicine barrel is fixedly installed on the inner side of the upper plate and is located below the middle plate, the medicine delivery assembly is connected to the vertical tank and is located below the middle plate, and the medicine delivery assembly is connected to the medicine barrel.

[0013] Furthermore, a third internal cavity is provided inside the sampling tank, and a first internal cavity and a second internal cavity are provided in sequence on the inner wall of the middle tube along the vertical downward direction. The first internal cavity, the second internal cavity and the third internal cavity are coaxial, and their diameters gradually increase along the vertical downward direction. The water inlet pipe is slidably installed on the inner wall of the first internal cavity, and the radius of the outer wall of the water inlet pipe is equal to the radius of the inner wall of the first internal cavity. A water inlet is provided on the outer surface of the water inlet pipe.

[0014] Furthermore, the depth adjustment assembly includes a fixed rod, which is fixedly installed on the lower side of the side panel and located on the inner side of the upper panel. A plurality of sliding rods are fixedly installed at equal intervals on the lower side of the fixed rod. A first spring is wound around the outer surface of each sliding rod, and one end of the first spring is fixedly installed on the outer surface of the sliding rod.

[0015] Furthermore, the depth adjustment mechanism also includes a lower rod, which is provided with a plurality of circular through holes. The number of the circular through holes of the lower rod is consistent with the number of the sliding rods. Each sliding rod is slidably installed on the inner wall of a circular through hole of the lower rod. A plurality of fixed screws are fixedly installed on the lower rod at equal intervals. The number of the fixed screws is consistent with the number of the first springs. The other end of the first spring is connected to the fixed screw. A positioning bolt is installed on each fixed screw, and the positioning bolt and the fixed screw form a spiral fit.

[0016] Furthermore, the water volume control assembly includes a fixed seat, which is fixedly mounted on the inner wall of the second inner cavity, a vertical shaft is slidably mounted on the fixed seat, the vertical shaft extends into the water inlet pipe, a connecting shaft is fixedly mounted on one end of the vertical shaft located in the water inlet pipe, a closed shaft is slidably mounted on both ends of the connecting shaft, a second spring is mounted on each closed shaft, and the closed shaft is connected to the connecting shaft through the second spring.

[0017] Furthermore, the diameter of the closed shaft is equal to the diameter of the inner wall of the water inlet, and the end of the closed shaft away from the connecting shaft is hemispherical. When the second spring is in a naturally unstressed state, the hemispherical part of the closed shaft does not completely extend out of the water inlet.

[0018] Furthermore, a threaded hole is provided at the lower part of the vertical shaft, a spiral shaft is installed in the threaded hole of the vertical shaft, the spiral shaft and the threaded hole of the vertical shaft form a spiral fit, a buoyancy plate is fixedly installed at the lower part of the spiral shaft, and the diameter of the buoyancy plate is smaller than the diameter of the inner wall of the third internal cavity.

[0019] Furthermore, a side hole is provided on the side of the sampling tank, and the drug delivery assembly includes a transfer tube, which is fixedly mounted on the inner wall of the side hole, connected to the sampling tank, connected to the vertical tank, and fixedly mounted on the middle plate. The interior of the vertical tank is hollow, and a piston is slidably mounted on the inner wall of the vertical tank, a follower rod is fixedly mounted on the piston, a lower shaft is fixedly mounted on the lower end of the follower rod, and a first connecting shaft is fixedly mounted on the outer surface of the lower shaft.

[0020] Furthermore, the interior of the medicine barrel is hollow and filled with detection medicine, a piston second is slidably installed on the inner wall of the medicine barrel, a piston rod is fixedly installed on the piston second, a second connecting shaft is fixedly installed on the outer surface of the piston rod, and the medicine delivery mechanism also includes a connecting rod, a first slide groove and a second slide groove are arranged on the side of the connecting rod, the second connecting shaft is slidably installed on the inner wall of the first slide groove, the first connecting shaft is slidably installed on the inner wall of the second slide groove, a rotating shaft is rotatably installed on the side of the connecting rod, the rotating shaft is fixedly installed on the side of the upper plate, and a sealing plate is fixedly installed on the side of the upper plate.

[0021] Compared with the prior art, the present invention has the following advantages: (1) the present invention realizes automatic sampling of seawater at a specific depth; (2) the present invention realizes control of the amount of sampled seawater; and (3) the present invention realizes automatic addition of the amount of detection reagent according to the amount of sampled seawater. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the internal structure of the present invention.

[0023] Figure 2 It is a schematic diagram of the shell structure of the present invention.

[0024] Figure 3 for Figure 2 Schematic diagram of the local enlarged structure at point A in the middle.

[0025] Figure 4 It is a schematic diagram of the overall structure of the present invention.

[0026] Figure 5 It is a schematic diagram of the sampling mechanism structure of the present invention.

[0027] Figure 6 for Figure 5 Schematic diagram of the local enlarged structure at point B in the middle.

[0028] Figure 7 It is a schematic diagram of the structure of the depth adjustment mechanism of the present invention.

[0029] Figure 8 for Figure 7 Schematic diagram of the partial enlarged structure at point C in the middle.

[0030] Fig. 9 It is a schematic diagram of the structure of the medicine delivery mechanism of the present invention.

[0031] Fig.10 for Fig. 9 Schematic diagram of the local enlarged structure at point D in the middle.

[0032] Figure numerals: 1-lifting ring; 2-housing; 3-sampling mechanism; 4-depth adjustment mechanism; 5-medicine delivery mechanism; 201-upper plate; 202-side enclosure; 203-middle plate; 204-sealing plate; 301-sampling tank; 302-middle tube; 303-side hole; 304-first internal cavity; 305-second internal cavity; 306-third internal cavity; 401-water inlet pipe; 402-fixed rod; 403-sliding rod; 404-first spring; 405-connecting rod; 406-integrated shaft; 407-lower rod; 408-fixing screw ;409-positioning bolt;410-water inlet;411-closing axis;412-vertical axis;413-connecting axis;414-second spring;415-fixed seat;416-screw axis;417-driving axis;418-buoyancy plate;501-medicine cartridge;502-piston rod;503-medicine delivery tube;504-transfer tube;505-vertical tank;506-following rod;507-lower axis;508-first connecting axis;509-connecting rod;510-rotating axis;511-second connecting axis;512-first slide groove;513-second slide groove. DETAILED DESCRIPTION

[0033] The technical solution of the present invention is further explained below in combination with and through specific implementation methods.

[0034] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0035] As attached Figure 1 ~Attached Fig.10As shown, the housing 2 includes an upper plate 201, a side panel 202 is fixedly mounted on the upper plate 201, a lifting ring 1 is fixedly mounted on the side panel 202, an intermediate plate 203 is fixedly mounted on the inner side of the upper plate 201, a sampling mechanism 3 includes a sampling tank 301, the sampling tank 301 is fixedly mounted on the intermediate plate 203, an intermediate tube 302 is fixedly mounted on the sampling tank 301, and the intermediate tube 302 is connected to the inside of the sampling tank 301, and a depth adjustment mechanism 4 includes a water inlet pipe 401, a depth adjustment component and a water volume control component, the depth adjustment component is mounted on the inner side of the upper plate 201 and is located above the intermediate plate 203, and the depth adjustment component is connected to the intermediate tube 302 is connected, the water volume control component is installed inside the sampling tank 301 and is located below the middle plate 203, and the water volume control component is connected to the sampling tank 301; the medicine delivery mechanism 5 includes a medicine barrel 501, a medicine delivery tube 503, a vertical tank 505 and a medicine delivery component, the vertical tank 505 is connected to the sampling tank 301, the lower part of the sampling tank 301 is connected to the medicine delivery tube 503, the medicine delivery tube 503 is connected to the medicine barrel 501, the medicine barrel 501 is fixedly installed on the inner side of the upper plate 201 and is located below the middle plate 203, the medicine delivery component is connected to the vertical tank 505 and is located below the middle plate 203, and the medicine delivery component is connected to the medicine barrel 501.

[0036] As attached Figure 3 ~Attached Figure 8 As shown, a third internal cavity 306 is arranged inside the sampling tank 301, and a first internal cavity 304 and a second internal cavity 305 are arranged in sequence on the inner wall of the middle tube 302 in the vertical downward direction. The first internal cavity 304, the second internal cavity 305 and the third internal cavity 306 are coaxial, and their diameters gradually increase along the vertical downward direction. The water inlet pipe 401 is slidably installed on the inner wall of the first internal cavity 304, and the radius of the outer wall of the water inlet pipe 401 is equal to the radius of the inner wall of the first internal cavity 304. A water inlet 410 is arranged on the outer surface of the water inlet pipe 401; the depth adjustment component includes a fixed rod 402, which is fixedly installed on the lower side of the side enclosure 202 and located on the inner side of the upper plate 201, and a plurality of sliding rods 403 are fixedly installed at equal intervals on the lower side of the fixed rod 402, and a section of the first spring 404 is wound around the outer surface of each sliding rod 403, and one end of the first spring 404 is fixedly installed on the outer surface of the sliding rod 403.

[0037] As attached Figure 4 ~Attached Fig. 9As shown, the depth adjustment mechanism 4 also includes a lower rod 407, which is provided with a plurality of circular through holes, the number of which is consistent with the number of the sliding rods 403, and each sliding rod 403 is slidably mounted on the inner wall of a circular through hole of the lower rod 407, and a plurality of fixed screws 408 are fixedly mounted on the lower rod 407 at equal intervals, the number of which is consistent with the number of the first springs 404, and the other end of the first spring 404 is connected to the fixed screw 408, and a positioning bolt 409 is mounted on each fixed screw 408, and the positioning bolt 409 and the fixed screw 408 form a spiral fit; the water volume control component includes a fixed seat 415, which is fixedly mounted on the inner wall of the second internal cavity 305, and a vertical shaft 412 is slidably mounted on the fixed seat 415 , the vertical shaft 412 extends into the water inlet pipe 401, and a connecting shaft 413 is fixedly installed at one end of the vertical shaft 412 located in the water inlet pipe 401, and a closed shaft 411 is slidably installed at both ends of the connecting shaft 413, and a second spring 414 is installed on each closed shaft 411, and the closed shaft 411 is connected to the connecting shaft 413 through the second spring 414; the diameter of the closed shaft 411 is equal to the diameter of the inner wall of the water inlet 410, and the end of the closed shaft 411 away from the connecting shaft 413 is hemispherical, and when the second spring 414 is in a naturally unstressed state, the hemispherical part of the closed shaft 411 does not completely extend out of the water inlet 410, and an integrated shaft 406 is fixedly installed at the lower part of the lower rod 407, and a connecting rod 405 is fixedly installed on the lower side of the integrated shaft 406, and the connecting rod 405 is fixedly installed on the water inlet pipe 401.

[0038] As attached Figure 5 ~Attached Fig.10As shown, a threaded hole is provided at the lower part of the vertical shaft 412, and a spiral shaft 416 is installed in the threaded hole of the vertical shaft 412. The spiral shaft 416 and the threaded hole of the vertical shaft 412 form a spiral fit. A driving shaft 417 is fixedly installed at the lower part of the spiral shaft 416, and a buoyancy plate 418 is fixedly installed at the lower side of the driving shaft 417. The diameter of the buoyancy plate 418 is smaller than the inner wall diameter of the third internal cavity 306; a side hole 303 is provided on the side of the sampling tank 301, and the medicine delivery component package The transmission tube 504 is fixedly mounted on the inner wall of the side hole 303, the transmission tube 504 is connected to the sampling tank 301, the transmission tube 504 is connected to the vertical tank 505, the vertical tank 505 is fixedly mounted on the middle plate 203, the vertical tank 505 is hollow inside, a piston 1 is slidably mounted on the inner wall of the vertical tank 505, a follower rod 506 is fixedly mounted on the piston 1, a lower shaft 507 is fixedly mounted on the lower end of the follower rod 506, and the lower shaft 507 is externally mounted. A first connecting shaft 508 is fixedly installed on the surface; the interior of the medicine barrel 501 is hollow and filled with detection medicine, a piston 2 is slidably installed on the inner wall of the medicine barrel 501, a piston rod 502 is fixedly installed on the piston 2, and a second connecting shaft 511 is fixedly installed on the outer surface of the piston rod 502, and the medicine delivery mechanism 5 also includes a connecting rod 509, and a first slide groove 512 and a second slide groove 513 are arranged on the side of the connecting rod 509, the second connecting shaft 511 is slidably installed on the inner wall of the first slide groove 512, and the first connecting shaft 508 is slidably installed on the inner wall of the second slide groove 513, and a rotating shaft 510 is rotatably installed on the side of the connecting rod 509, and the rotating shaft 510 is fixedly installed on the side of the upper plate 201, and a sealing plate 204 is fixedly installed on the side of the upper plate 201, and the medicine delivery tube 503 extends into the interior of the medicine barrel 501. In the initial state, the lowermost end of the medicine delivery tube 503 is located at the lower side of the piston 2, and a one-way valve is installed at the connection between the medicine delivery tube 503 and the third internal cavity 306.

[0039] The working principle of the present invention is as follows.

[0040] (i) Different numbers of positioning bolts 409 are installed on the fixing screw 408 according to the depth of the seawater to be collected, so as to link different numbers of first springs 404 to the lower rod 407. At the same time, the spiral shaft 416 is adjusted according to the different amounts of seawater collected to adjust the distance between the fixing seat 415 and the buoyancy plate 418. After the adjustment, the device is sent into the seawater through the lifting ring 1. Then, under the pressure of the seawater, the water inlet pipe 401 slides along the inner wall of the first internal cavity 304. The downward movement of the water inlet pipe 401 needs to overcome the elastic force of the first spring 404. Therefore, different numbers of first springs 404 can be used to control the pressure required for the downward movement of the water inlet pipe 401. When the water inlet pipe 401 overcomes the elastic force of the first spring 404 and the water inlet 410 enters the second internal cavity 305, the seawater enters the third internal cavity 306 through the water inlet 410.

[0041] (ii) With the increase of seawater in the third internal cavity 306, the buoyancy plate 418 gradually rises. When the buoyancy plate 418 rises, it drives the spiral shaft 416 to rise through the driving shaft 417. The spiral shaft 416 drives the vertical shaft 412 to rise. The vertical shaft 412 drives the closed shaft 411 to rise through the connecting shaft 413. When the closed shaft 411 rises, when the closed shaft 411 coincides with the water inlet 410, the closed shaft 411 enters the water inlet 410, thereby completing the sealing of the water inlet 410, so that seawater cannot enter the third internal cavity 306.

[0042] (III) As the seawater in the third internal cavity 306 rises, the seawater enters the vertical tank 505 through the transfer tube 504, and drives the piston 1 in the vertical tank 505 to rise. The piston 1 drives the lower shaft 507 to rise through the follower rod 506. The lower shaft 507 drives the connecting rod 509 to rotate around the rotating shaft 510 through the first connecting shaft 508. When the connecting rod 509 rotates, it drives the piston rod 502 to descend through the second connecting shaft 511, thereby driving the piston 2 in the medicine barrel 501 to descend, and the medicine in the medicine barrel 501 is pressed into the sampling tank 301 through the piston 2.

[0043] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention, and any reference numerals in the claims should not be considered as limiting the claims involved.

Claims

1. A marine water quality monitoring device, comprising a suspension ring (1), characterized in that: The invention comprises a housing (2), a sampling mechanism (3), a depth adjustment mechanism (4) and a medicine delivery mechanism (5), wherein the housing (2) comprises an upper plate (201), a side panel (202) is fixedly mounted on the upper plate (201), a lifting ring (1) is fixedly mounted on the side panel (202), an intermediate plate (203) is fixedly mounted on the inner side of the upper plate (201), and the sampling mechanism (3) comprises a sampling tank (301), the sampling tank (301) is fixedly mounted on the intermediate plate (203), an intermediate tube (302) is fixedly mounted on the sampling tank (301), and the intermediate tube (302) is communicated with the inside of the sampling tank (301); The depth adjustment mechanism (4) comprises a water inlet pipe (401), a depth adjustment component and a water volume control component. The inner wall of the intermediate pipe (302) is provided with a first internal cavity (304) in a vertical downward direction. The depth adjustment component comprises a fixed rod (402). A plurality of sliding rods (403) are fixedly installed at equal intervals on the lower side of the fixed rod (402). A first spring (404) is wound around the outer surface of each sliding rod (403). The depth adjustment mechanism (4) further comprises a lower rod (407). A plurality of fixed screw rods (408) are fixedly installed at equal intervals on the lower rod (407). A positioning bolt (409) is installed on each fixed screw rod (408). The water volume control component comprises a fixed seat (415). A vertical shaft (412) is slidably installed on the fixed seat (415). A spiral shaft (416) is installed in a threaded hole of the vertical shaft (412). A buoyancy plate (418) is fixedly installed at the lower part of the spiral shaft (416). Different numbers of positioning bolts (409) are installed on the fixing screw rod (408) according to the depth of the seawater to be collected, so that different numbers of first springs (404) are connected to the lower rod (407). At the same time, the spiral shaft (416) is adjusted according to the different amounts of seawater collected, so as to adjust the distance between the fixing seat (415) and the buoyancy plate (418). After the adjustment, the device is sent into the seawater through the lifting ring (1). Then, under the pressure of the seawater, the water inlet pipe (401) slides along the inner wall of the first internal cavity (304). The downward movement of the water inlet pipe (401) needs to overcome the elastic force of the first spring (404). Therefore, the pressure required for controlling the downward movement of the water inlet pipe (401) can be achieved by using different numbers of first springs (404). When the water inlet pipe (401) overcomes the elastic force of the first spring (404) to allow the water inlet (410) to enter the second internal cavity (305), the seawater enters the third internal cavity (306) through the water inlet (410).

2. The marine water quality monitoring device according to claim 1, characterized in that: The depth adjustment component is installed on the inner side of the upper plate (201) and is located above the middle plate (203). The depth adjustment component is connected to the middle tube (302). The water volume control component is installed inside the sampling tank (301) and is located below the middle plate (203). The water volume control component is connected to the sampling tank (301). A third internal cavity (306) is arranged inside the sampling tank (301). Second internal cavities (305) are arranged in sequence on the inner wall of the middle tube (302) in a vertical downward direction. The first internal cavity (304), the second internal cavity (305) and the third internal cavity (306) are coaxial and their diameters gradually increase in a vertical downward direction. The water inlet pipe (401) is slidably installed on the inner wall of the first internal cavity (304). The radius of the outer wall of the water inlet pipe (401) is equal to the radius of the inner wall of the first internal cavity (304). A water inlet (410) is arranged on the outer surface of the water inlet pipe (401).

3. The marine water quality monitoring device according to claim 2, characterized in that: The fixing rod (402) is fixedly mounted on the lower side of the side panel (202) and is located on the inner side of the upper plate (201), and one end of the first spring (404) is fixedly mounted on the outer surface of the sliding rod (403).

4. The marine water quality monitoring device according to claim 3, characterized in that: The lower rod (407) is provided with a plurality of circular through holes, the number of the circular through holes of the lower rod (407) being the same as the number of the sliding rods (403), each sliding rod (403) being slidably mounted on the inner wall of a circular through hole of the lower rod (407), the number of the fixing screw rods (408) being the same as the number of the first springs (404), the other end of the first spring (404) being connected to the fixing screw rod (408), and the positioning bolt (409) and the fixing screw rod (408) forming a spiral fit.

5. The marine water quality monitoring device according to claim 2, characterized in that: The fixing seat (415) is fixedly mounted on the inner wall of the second inner cavity (305); the vertical shaft (412) extends into the water inlet pipe (401); a connecting shaft (413) is fixedly mounted on one end of the vertical shaft (412) located in the water inlet pipe (401); a closed shaft (411) is slidably mounted on each end of the connecting shaft (413); a second spring (414) is mounted on each closed shaft (411); and the closed shaft (411) is connected to the connecting shaft (413) via the second spring (414).

6. The marine water quality monitoring device according to claim 5, characterized in that: The diameter of the closed shaft (411) is equal to the diameter of the inner wall of the water inlet (410); one end of the closed shaft (411) away from the connecting shaft (413) is hemispherical; when the second spring (414) is in a naturally unstressed state, the hemispherical portion of the closed shaft (411) does not completely extend out of the water inlet (410).

7. The marine water quality monitoring device according to claim 6, characterized in that: A threaded hole is provided at the lower portion of the vertical shaft (412), the spiral shaft (416) and the threaded hole of the vertical shaft (412) form a spiral fit, and the diameter of the buoyancy plate (418) is smaller than the diameter of the inner wall of the third internal cavity (306).

8. The marine water quality monitoring device according to claim 4, characterized in that: The medicine delivery mechanism (5) comprises a medicine barrel (501), a medicine delivery tube (503), a vertical tank (505) and a medicine delivery assembly, wherein the vertical tank (505) is connected to the sampling tank (301), the lower part of the sampling tank (301) is connected to the medicine delivery tube (503), the medicine delivery tube (503) is connected to the medicine barrel (501), the medicine barrel (501) is fixedly mounted on the inner side of the upper plate (201) and is located below the middle plate (203), the medicine delivery assembly is connected to the vertical tank (505) and is located below the middle plate (203), the medicine delivery assembly is connected to the medicine barrel (501), and the side of the sampling tank (301) is provided with a side hole (3 03), the drug delivery component includes a transfer tube (504), the transfer tube (504) is fixedly mounted on the inner wall of the side hole (303), the transfer tube (504) is connected to the sampling tank (301), the transfer tube (504) is connected to the vertical tank (505), the vertical tank (505) is fixedly mounted on the middle plate (203), the vertical tank (505) is hollow inside, a piston 1 is slidably mounted on the inner wall of the vertical tank (505), a follower rod (506) is fixedly mounted on the piston 1, a lower shaft (507) is fixedly mounted on the lower end of the follower rod (506), and a first connecting shaft (508) is fixedly mounted on the outer surface of the lower shaft (507).

9. The marine water quality monitoring device according to claim 8, characterized in that: The interior of the medicine barrel (501) is hollow and filled with detection medicine. A piston 2 is slidably mounted on the inner wall of the medicine barrel (501), a piston rod (502) is fixedly mounted on the piston 2, and a second connecting shaft (511) is fixedly mounted on the outer surface of the piston rod (502). The medicine delivery mechanism (5) also includes a connecting rod (509), and a first slide groove (512) and a second slide groove (513) are arranged on the side of the connecting rod (509). The second connecting shaft (511) is slidably mounted on the inner wall of the first slide groove (512), and the first connecting shaft (508) is slidably mounted on the inner wall of the second slide groove (513). A rotating shaft (510) is rotatably mounted on the side of the connecting rod (509), and the rotating shaft (510) is fixedly mounted on the side of the upper plate (201). A sealing plate (204) is fixedly mounted on the side of the upper plate (201).

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