Field water quality detection sampler

Abstract

The application discloses a field water quality detection sampler, which comprises a sampler outer cylinder, a center mechanism, a counterweight ring, a sampler upper cover, a blocking mechanism one and a floating assembly. The center mechanism is fixed on the inner side of the bottom of the sampler outer cylinder through screwing. The counterweight ring is fixed on the outer side of the bottom of the sampler outer cylinder through screwing. The sampler upper cover is fixed on the upper end of the sampler outer cylinder through screwing. A plurality of exhaust holes are formed in the sampler upper cover. The center mechanism comprises a center outer cylinder and a water inlet column. The center outer cylinder is screwed on the bottom of the sampler outer cylinder. The inner side of the center outer cylinder is screwed with the blocking mechanism one. The inner side of the blocking mechanism one is screwed with the water inlet column. The water inlet column is fixedly connected with the top of the center outer cylinder through a support plate. The floating assembly is slidably arranged in the water inlet column.

Description

Technical Field

[0001] This invention relates to the field of water quality sampling technology, specifically a field water quality testing sampler. Background Technology

[0002] A water quality sampler is a device used to collect water samples. In field environments, portable water samplers are required for water quality sampling.

[0003] In daily production work, water samples are mainly taken from 0.5m below the water surface. The existing portable water sampler sampling process generally involves placing the sampler into the water via a measuring rope. Sampling ports are set at both ends of the sampler. The sampling ports automatically open when the sampler enters the water. After sampling, the sampler is pulled out, and the sampling ports close during the pulling process. Then, the collected water sample is transported to a water sample bottle through the outlet and rubber tube to complete the sampling. During this process, the sampler is easily affected by its own height when it sinks into the water, which makes it easy for the obtained water sample to be mixed with other water samples within the range above and below the 0.5m below the water surface. This means that the water sample may contain surface water or water from deeper layers, thus affecting the water quality test results.

[0004] Therefore, it is necessary to provide a field water quality testing sampler to solve the problems mentioned in the background art. Summary of the Invention

[0005] To achieve the above objectives, the present invention provides the following technical solution: a field water quality testing sampler, comprising a sampler outer cylinder, a central mechanism, a counterweight ring, a sampler top cover, a barrier mechanism, and a floating assembly, wherein the central mechanism is threadedly tightened and fixed to the inner bottom of the sampler outer cylinder, the counterweight ring is threadedly tightened and fixed to the outer bottom of the sampler outer cylinder, and the sampler top cover is threadedly tightened and fixed to the upper end of the sampler outer cylinder, and the sampler top cover is provided with multiple vent holes;

[0006] The central mechanism includes a central outer cylinder and a water inlet column. The central outer cylinder is screwed to the bottom of the sampler outer cylinder by threads. A first barrier mechanism is screwed to the inner side of the central outer cylinder by threads. A water inlet column is screwed to the inner side of the first barrier mechanism by threads. The water inlet column is fixedly connected to the top of the central outer cylinder by a support plate. A floating component is slidably arranged in the water inlet column.

[0007] Preferably, the floating assembly includes a floating ring, a second blocking mechanism, and a retaining plate. The floating ring is slidably disposed in the water inlet column. The second blocking mechanism is screwed onto the inner side of the floating ring by threads. Multiple retaining plates are fixedly disposed on the outer side of the floating ring, and the retaining plates have water inlet channels.

[0008] The water inlet column and the support plate are provided with multiple water inlet grooves in a circular pattern, and the card plate slides along the water inlet grooves in a sealed manner.

[0009] Preferably, the height of the water inlet column is less than 0.5m, and the height of the sampler outer cylinder is greater than 0.5m;

[0010] The water inlet column and the central outer cylinder together form an isolation chamber, and the central outer cylinder and the sampler outer cylinder together form a water storage cavity, and the water storage volume of the isolation chamber is greater than the water inlet volume of the water inlet column.

[0011] A water thermometer is fixedly installed in the water storage cavity, and a water outlet is provided at the bottom of the water storage cavity. A rubber tube is connected to the outside of the water outlet, and a water stop clamp is held on the rubber tube.

[0012] Preferably, the barrier mechanism includes an inner ring seat, an outer ring seat, and blades. The inner ring seat is screwed onto the water inlet column, and the outer ring seat is screwed onto the outer cylinder of the sampler. A plurality of sealing plates are fixedly disposed between the inner ring seat and the outer ring seat. A rotating ring is rotatably disposed on the inner ring seat, and a plurality of blades are disposed on the rotating ring at an incline. The blades are located between two adjacent sealing plates.

[0013] Preferably, an extension plate 1 is fixedly provided on the upper side of the blade 1, and an extension plate 2 is fixedly provided on the bottom of the blade 1. The extension plate 1 and the extension plate 2 slide along the upper and lower sides of two adjacent sealing plates 1, respectively.

[0014] Furthermore, the length of the first extension plate is greater than the length of the second extension plate.

[0015] Preferably, the second blocking mechanism includes a base, a rotating shaft, and two blades. The base is screwed onto the floating ring by a thread, the rotating shaft is rotatably mounted on the base, and a plurality of sealing plates are spaced apart on the base. A plurality of blades are circumferentially inclined on the rotating shaft, and the blades are located between two adjacent sealing plates.

[0016] Preferably, an extension plate three is fixedly provided on the upper side of the blade two, and an extension plate four is fixedly provided on the bottom of the blade two. The extension plate three and the extension plate four slide along the upper and lower sides of two adjacent sealing plates two, respectively. A spring one is provided between the extension plate four and the sealing plate two.

[0017] Furthermore, the length of the third extension plate is less than the length of the fourth extension plate.

[0018] Preferably, a membrane laying mechanism is fixedly installed at the bottom of the water inlet column, and a membrane pulling ring is fixedly installed on the floating ring.

[0019] Preferably, the film-laying mechanism includes a fixed base, a film-winding ring, and an auxiliary wheel. The fixed base is fixedly mounted on the water inlet column. A slide rod is fixedly mounted on the fixed base. A slide plate is slidably mounted on the slide rod. A spring is provided between the slide plate and the fixed base. Clamping rods are symmetrically and rotatably mounted on the upper and lower sides of the slide plate. A rubber wheel is rotatably mounted at the output end of the clamping rod. An elastic pull block is fixedly mounted between the two clamping rods. The auxiliary wheel is rotatably mounted at the end of the fixed base away from the slide rod.

[0020] The film roll is rotatably disposed between the auxiliary wheel and the two rubber wheels, and the two rubber wheels are synchronously driven by a waterproof motor.

[0021] Preferably, the outer cylinder of the sampler is provided with a hook, a measuring rope is tied to the hook, and the outer cylinder of the sampler is also provided with a water entry mark;

[0022] An indicator light is provided on the top of the water storage chamber, and a battery box for powering the indicator light is also provided in the water storage chamber.

[0023] Compared with the prior art, the present invention provides a field water quality testing sampler with the following advantages:

[0024] This invention is equipped with a first barrier mechanism, a floating component, and a second barrier mechanism. During the sampling process, the first barrier mechanism effectively seals the bottom of the isolation chamber, allowing water samples to enter the isolation chamber only through the floating component. Subsequently, the second barrier mechanism seals the water sample in the inlet column, ensuring that the sampler fills the isolation chamber first during sampling, meaning that surface water completely enters the isolation chamber. The isolation chamber is then sealed from the inlet column by a membrane-laying mechanism. Based on the water inlet mark, the sampler's immersion depth is limited to 0.5m below the water surface. The second barrier mechanism then allows the water sample at 0.5m to enter the storage chamber, ensuring that the obtained water sample is entirely from the 0.5m depth, effectively improving the accuracy of water quality testing. Furthermore, the first barrier mechanism allows the surface water in the isolation chamber to be drained back when the sampler is lifted, reducing the lifting burden on the sampling personnel and effectively improving its convenience. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the floating component structure in this invention;

[0027] Figure 3 This is a schematic diagram of the two-part barrier mechanism in this invention;

[0028] Figure 4 This is a schematic diagram of the barrier mechanism in this invention;

[0029] Figure 5 for Figure 1 Enlarged schematic diagram of part A.

[0030] In the diagram: 1. Sampler outer cylinder; 11. Hook; 2. Central mechanism; 21. Central outer cylinder; 22. Water inlet column; 23. Support plate; 24. Water inlet tank; 25. Isolation chamber; 26. Water storage chamber; 261. Water thermometer; 262. Water outlet; 263. Rubber hose; 3. Counterweight ring; 4. Sampler top cover; 41. Vent hole; 5. Barrier mechanism one; 51. Inner ring seat; 52. Outer ring seat; 53. Blade one; 531. Extension plate one; 532. Extension plate two; 5 4. Sealing plate one; 6. Floating assembly; 61. Floating ring; 62. Barrier mechanism two; 621. Base; 622. Rotating shaft; 623. Blade two; 634. Sealing plate two; 625. Extension plate three; 626. Extension plate two; 627. Spring one; 63. Clamping plate; 64. Film pulling ring; 7. Film laying mechanism; 71. Fixing seat; 72. Film winding ring; 73. Auxiliary wheel; 74. Slide bar; 75. Slide plate; 76. Spring two; 77. Clamping rod; 78. Rubber wheel. Detailed Implementation

[0031] Example: Please refer to Figures 1-5 In this embodiment of the invention, a field water quality testing sampler includes a sampler outer cylinder 1, a central mechanism 2, a counterweight ring 3, a sampler top cover 4, a barrier mechanism 5, and a floating assembly 6. The central mechanism 2 is screwed and fixed to the inner bottom of the sampler outer cylinder 1, the counterweight ring 3 is screwed and fixed to the outer bottom of the sampler outer cylinder 1, and the sampler top cover 4 is screwed and fixed to the upper end of the sampler outer cylinder 1. The sampler top cover 4 has multiple vent holes 41.

[0032] The central mechanism 2 includes a central outer cylinder 21 and a water inlet column 22. The central outer cylinder 21 is screwed to the bottom of the sampler outer cylinder 1 by threads. A barrier mechanism 5 is screwed to the inner side of the central outer cylinder 21 by threads. The water inlet column 22 is screwed to the inner side of the barrier mechanism 5 by threads. The water inlet column 22 is fixedly connected to the top of the central outer cylinder 21 by a support plate 23. A floating component 6 is slidably disposed in the water inlet column 22.

[0033] During implementation, the sampler is slowly lowered into the water, and the water inlet mark on the outer cylinder 1 of the sampler is observed, ensuring that the bottom of the outer cylinder 1 is 0.5m above the water surface. During this process, the water sample enters through the inlet column 22 and pushes the floating assembly 6 upwards. Subsequently, the water sample is blocked by the second blocking mechanism 62 and flows into the isolation chamber 25 through the water inlet channel 65 on the clamping plate 63. As the water sample continues to enter, the water level in the isolation chamber 25 gradually rises, pushing the floating assembly 6 upwards until it touches the support plate 23 and seals the water inlet groove 24 at the top of the support plate 23. Simultaneously, during its ascent, the floating assembly 6 uses the membrane laying mechanism 7 to lay a waterproof membrane on the inlet column 22, sealing the water inlet groove 24 on the inlet column 22, thus completely sealing the isolation chamber 25. This allows surface water to be completely transported into and sealed within the isolation chamber 25. To ensure that the obtained water sample is free of surface water, effectively improving the accuracy of water quality testing, the water sample is then pushed by the increasing water pressure. As the pressure increases, the water sample can squeeze the blade 623 in the second barrier mechanism 62. When the squeezing force exceeds the supporting force of the spring 627, the blade 623 deflects, causing the barrier mechanism 62 to open, allowing the water sample at 0.5m to enter the water storage chamber 26. When the water storage chamber 26 is full, the water sample contacts the bottom of the indicator light, activating the circuit and alerting the sampling personnel that sampling is complete. Then, the outer cylinder 1 of the sampler is pulled upwards out of the water. During this process, the water sample in the isolation chamber 25 is subjected to downward pressure, causing the blade 53 in the first barrier mechanism 5 to deflect, opening the barrier mechanism 5 and allowing the water sample in the isolation chamber 25 to flow out, effectively reducing the lifting burden on the sampling personnel. The obtained water sample is then injected into the water sample bottle through the rubber tube 263 to complete the sampling.

[0034] In this embodiment, as Figure 2 and Figure 5 The floating assembly 6 includes a floating ring 61, a second blocking mechanism 62, and a retaining plate 63. The floating ring 61 is slidably disposed in the water inlet column 22. The second blocking mechanism 62 is screwed onto the inner side of the floating ring 61. Multiple retaining plates 63 are fixedly disposed on the outer side of the floating ring 61. A water inlet channel 65 is opened in the retaining plate 63.

[0035] The water inlet column 22 and the support plate 23 are provided with multiple water inlet grooves 24 in a circular pattern, and the clamping plate 63 slides along the water inlet grooves 24 in a sealed manner.

[0036] During implementation, the floating component 6 can slide upwards by buoyancy after water enters the water inlet column 22, separating the water inlet column 22 and the isolation chamber 25 into two spaces. This ensures that the water sample is gradually transported through the bottom of the isolation chamber 25 until the isolation chamber 25 is full of water sample. This ensures that the surface water of the priority water inlet device completely enters the isolation chamber 25 during sampling. The isolation chamber 25 is completely sealed after the water sample is filled by the membrane laying mechanism 7 and the clamping plate 63, effectively preventing the surface water sample from mixing with the water sample at 0.5m, and ensuring that all water samples obtained are from the 0.5m water sample.

[0037] In this embodiment, the height of the water inlet column 22 is less than 0.5m, and the height of the sampler outer cylinder 1 is greater than 0.5m;

[0038] The water inlet column 22 and the central outer cylinder 21 together form an isolation chamber 25, and the central outer cylinder 21 and the sampler outer cylinder 1 together form a water storage chamber 26, and the water storage volume of the isolation chamber 25 is greater than the water inlet volume of the water inlet column 22.

[0039] A water thermometer 261 is fixedly installed in the water storage cavity 26. A water outlet 262 is provided at the bottom of the water storage cavity 26. A rubber tube 263 is connected to the outside of the water outlet 262. A water stop clamp is held on the rubber tube 263.

[0040] Specifically, the height of the outer cylinder 1 of the sampler is set to be greater than 0.5m, and the height of the water inlet column 22 is set to be less than 0.5m. This allows the sampler to be placed at a depth of 0.5m below the water surface without having to completely submerge it during sampling. The sampling process can be completed simply by placing the bottom of the outer cylinder 1 of the sampler at a depth of 0.5m according to the water inlet mark. This makes the sampling process more convenient. The water inlet depth of the sampler is limited to 0.5m to ensure that all water samples entering the sampler are from a depth of 0.5m. Furthermore, the volume of the isolation chamber 25 is greater than the water inlet volume of the water inlet column 22 to ensure that the surface water entering the water inlet column 22 completely enters the isolation chamber 25, thereby ensuring that the obtained 0.5m water sample does not mix with the surface water.

[0041] In this embodiment, as Figure 4 The barrier mechanism 5 includes an inner ring seat 51, an outer ring seat 52, and blades 53. The inner ring seat 51 is screwed onto the water inlet column 22, and the outer ring seat 52 is screwed onto the sampler outer cylinder 1. A plurality of sealing plates 54 are fixedly arranged between the inner ring seat 51 and the outer ring seat 52. A rotating ring 55 is rotatably arranged on the inner ring seat 51, and a plurality of blades 53 are arranged circumferentially on the rotating ring 55. The blades 53 are located between two adjacent sealing plates 54.

[0042] In this embodiment, as Figure 4An extension plate 531 is fixedly provided on the upper side of the blade 53, and an extension plate 532 is fixedly provided on the bottom of the blade 53. The extension plate 531 and the extension plate 532 slide along the upper and lower sides of two adjacent sealing plates 54, respectively.

[0043] Furthermore, the length of the first extension plate 531 is greater than the length of the second extension plate 532.

[0044] During implementation, when the sampler enters the water, the blade 53 is subjected to upward water pressure, causing it to rotate clockwise. This causes the extension plate 532 to press tightly against the sealing plate 54, ensuring that the barrier mechanism 5 is in a closed state and preventing water samples from entering from the bottom of the isolation chamber 25. When the sampler finishes sampling and the outer cylinder 1 is pulled upward, the blade 53 is subjected to downward pressure, causing it to rotate counterclockwise. This causes the extension plate 532 to detach from the sealing plate 54, opening the barrier mechanism 5 and draining the surface water from the isolation chamber 25. This process effectively isolates the water sample during sampling and drains the surface water after sampling, while also reducing the lifting burden on the sampling personnel.

[0045] In this embodiment, as Figure 2 and Figure 3 The second barrier mechanism 62 includes a base 621, a rotating shaft 622, and a second blade 623. The base 621 is screwed onto the floating ring 61 by threads. The rotating shaft 622 is rotatably mounted on the base 621. A plurality of sealing plates 624 are spaced apart on the base 621. A plurality of second blades 623 are circumferentially inclined on the rotating shaft 622. The second blades 623 are located between two adjacent sealing plates 624.

[0046] In this embodiment, as Figure 2 and Figure 3 An extension plate 3 625 is fixedly provided on the upper side of the blade 2 623, and an extension plate 4 626 is fixedly provided on the bottom of the blade 2 623. The extension plate 3 625 and the extension plate 4 626 slide along the upper and lower sides of two adjacent sealing plates 2 624 respectively. A spring 1 627 is provided between the extension plate 4 626 and the sealing plate 2 624.

[0047] Furthermore, the length of the third extension plate 625 is less than the length of the fourth extension plate 626.

[0048] During implementation, when a water sample enters the inlet column 22, it preferentially presses against the floating component 6 and flows into the isolation chamber 25 through the water flow channel. At this time, because the water pressure in the isolation chamber 25 is less than the supporting force of the spring 627, the blade 623 does not deflect, and the barrier mechanism 62 remains closed. When the isolation chamber 25 is filled with water, the water pressure increases, which in turn squeezes the blade 623, causing it to deflect clockwise. This further causes the extension plate 625 to detach from the sealing plate 624, opening the barrier mechanism 62. The water sample then passes through the barrier mechanism 62 and flows into the water storage chamber 26. This ensures that the water sample fills the isolation chamber 25 before entering the water storage chamber 26 after entering the inlet column 22. In other words, surface water is isolated by the isolation chamber 25, ensuring that the water sample obtained in the water storage chamber 26 is from a depth of 0.5m.

[0049] In this embodiment, as Figure 5 The bottom of the water inlet column 22 is fixedly provided with a membrane laying mechanism 7, and the floating ring 61 is fixedly provided with a membrane pulling ring 64.

[0050] In this embodiment, as Figure 5 The film-laying mechanism 7 includes a fixed base 71, a film-winding ring 72, and an auxiliary wheel 73. The fixed base 71 is fixedly mounted on the water inlet column 22. A slide rod 74 is fixedly mounted on the fixed base 71. A slide plate 75 is slidably mounted on the slide rod 74. A spring 76 is provided between the slide plate 75 and the fixed base 71. Clamping rods 77 are symmetrically and rotatably mounted on the upper and lower sides of the slide plate 75. A rubber wheel 78 is rotatably mounted at the output end of the clamping rod 77. An elastic pull block is fixedly mounted between the two clamping rods 77. The auxiliary wheel 73 is rotatably mounted at the end of the fixed base 71 away from the slide rod 74.

[0051] The film roll 72 is rotatably disposed between the auxiliary wheel 73 and the two rubber wheels 78, and the two rubber wheels 78 are synchronously driven by a waterproof motor.

[0052] During implementation, when the floating ring 61 slides upward, the membrane-pulling ring 64 pulls the waterproof membrane, causing it to be laid on the water inlet column 22. This seals the water inlet groove 24 on the water inlet column 22, sealing the water sample in the isolation chamber 25 after it enters. This effectively prevents surface water from contaminating the water sample at a depth of 0.5m in the water inlet column 22. After sampling is completed, the water sample in the isolation chamber 25 flows out through the barrier mechanism 5. At this time, the floating ring 61 slides downward, activating the waterproof motor to rotate the two rubber wheels 78. Under the action of friction, the membrane-rolling ring 72 rotates, thereby retracting the waterproof membrane. The outer diameter of the membrane-rolling ring 72 changes as the waterproof membrane is extended. The sliding plate 75, spring 76, and elastic pull block effectively keep the rubber wheels 78 pressed against the membrane-rolling ring 72, ensuring that the waterproof membrane can be effectively retracted, further improving the convenience of the sampler.

[0053] In this embodiment, as Figure 1 The sampler outer cylinder 1 is provided with a hook 11, a measuring rope is tied to the hook 11, and a water entry mark is also provided on the sampler outer cylinder 1;

[0054] An indicator light is provided on the top of the water storage cavity 26, and a battery box for powering the indicator light is also provided in the water storage cavity 26.

[0055] In summary, when implementing this invention, sampling can be completed simply by placing the bottom of the sampler 0.5m underwater. Furthermore, the floating component 6, the first barrier mechanism 5, the second barrier mechanism 62, and the membrane laying mechanism 7 can effectively isolate the incoming surface water in the isolation chamber 25, ensuring that the water sample obtained in the water storage chamber 26 is the water sample from 0.5m below the surface, thereby effectively improving the water sample quality and the accuracy of water quality testing.

[0056] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A field water quality testing sampler, characterized in that: The sampler includes an outer cylinder (1), a central mechanism (2), a counterweight ring (3), a sampler top cover (4), a barrier mechanism (5), and a floating assembly (6). The central mechanism (2) is screwed and fixed to the inner bottom of the outer cylinder (1). The counterweight ring (3) is screwed and fixed to the outer bottom of the outer cylinder (1). The sampler top cover (4) is screwed and fixed to the upper end of the outer cylinder (1). The sampler top cover (4) has multiple vent holes (41). The central mechanism (2) includes a central outer cylinder (21) and a water inlet column (22). The central outer cylinder (21) is screwed to the bottom of the sampler outer cylinder (1) by a thread. A barrier mechanism (5) is screwed to the inside of the central outer cylinder (21) by a thread. A water inlet column (22) is screwed to the inside of the barrier mechanism (5) by a thread. The water inlet column (22) is fixedly connected to the top of the central outer cylinder (21) by a support plate (23). A floating component (6) is slidably arranged in the water inlet column (22). The floating assembly (6) includes a floating ring (61), a second barrier mechanism (62), and a retaining plate (63). The floating ring (61) is slidably disposed in the water inlet column (22). The second barrier mechanism (62) is screwed onto the inner side of the floating ring (61) by a thread. Multiple retaining plates (63) are fixedly disposed on the outer side of the floating ring (61). A water inlet channel (65) is opened in the retaining plate (63). The water inlet column (22) and the support plate (23) are provided with multiple water inlet grooves (24) in a circular pattern, and the clamping plate (63) slides along the water inlet grooves (24) in a sealed manner; A film-laying mechanism (7) is fixedly installed at the bottom of the water inlet column (22). The film-laying mechanism (7) includes a fixed seat (71), a film roll ring (72), and an auxiliary wheel (73). The fixed seat (71) is fixedly installed on the water inlet column (22). A slide rod (74) is fixedly installed on the fixed seat (71). A slide plate (75) is slidably installed on the slide rod (74). A spring (76) is installed between the slide plate (75) and the fixed seat (71). Clamping rods (77) are symmetrically rotated on the upper and lower sides of the slide plate (75). A rubber wheel (78) is rotatably installed at the output end of the clamping rod (77). An elastic pull block is fixedly installed between the two clamping rods (77). The auxiliary wheel (73) is rotatably installed at the end of the fixed seat (71) away from the slide rod (74). The film roll (72) is rotatably disposed between the auxiliary wheel (73) and the two rubber wheels (78), and the two rubber wheels (78) are synchronously driven by a waterproof motor.

2. The field water quality testing sampler according to claim 1, characterized in that: The height of the water inlet column (22) is less than 0.5m, and the height of the sampler outer cylinder (1) is greater than 0.5m; The water inlet column (22) and the central outer cylinder (21) together form an isolation chamber (25), and the central outer cylinder (21) and the sampler outer cylinder (1) together form a water storage chamber (26), and the water storage volume of the isolation chamber (25) is greater than the water inlet volume of the water inlet column (22); A water thermometer (261) is fixedly installed in the water storage cavity (26). A water outlet (262) is provided at the bottom of the water storage cavity (26). A rubber tube (263) is connected to the outside of the water outlet (262). A water stop clamp is held on the rubber tube (263).

3. The field water quality testing sampler according to claim 1, characterized in that: The barrier mechanism (5) includes an inner ring seat (51), an outer ring seat (52), and a blade (53). The inner ring seat (51) is screwed onto the water inlet column (22) by a thread, and the outer ring seat (52) is screwed onto the outer cylinder (1) of the sampler by a thread. A plurality of sealing plates (54) are fixedly arranged between the inner ring seat (51) and the outer ring seat (52). A rotating ring (55) is rotatably arranged on the inner ring seat (51), and a plurality of blades (53) are arranged circumferentially on the rotating ring (55). The blades (53) are located between two adjacent sealing plates (54).

4. The field water quality testing sampler according to claim 3, characterized in that: An extension plate 1 (531) is fixedly provided on the upper side of the blade 1 (53), and an extension plate 2 (532) is fixedly provided on the bottom of the blade 1 (53). The extension plate 1 (531) and the extension plate 2 (532) slide along the upper and lower sides of two adjacent sealing plates 1 (54), respectively. Furthermore, the length of the first extension plate (531) is greater than the length of the second extension plate (532).

5. The field water quality testing sampler according to claim 1, characterized in that: The second barrier mechanism (62) includes a base (621), a rotating shaft (622), and a second blade (623). The base (621) is screwed onto the floating ring (61) by a thread. The rotating shaft (622) is rotatably mounted on the base (621). A plurality of sealing plates (624) are spaced apart on the base (621). A plurality of second blades (623) are circumferentially inclined on the rotating shaft (622). The second blades (623) are located between two adjacent sealing plates (624).

6. A field water quality testing sampler according to claim 5, characterized in that: An extension plate three (625) is fixedly provided on the upper side of the blade two (623), and an extension plate four (626) is fixedly provided on the bottom of the blade two (623). The extension plate three (625) and the extension plate four (626) slide along the upper and lower sides of two adjacent sealing plates two (624) respectively. A spring one (627) is provided between the extension plate four (626) and the sealing plate two (624). Furthermore, the length of the third extension plate (625) is less than the length of the fourth extension plate (626).

7. A field water quality testing sampler according to claim 1, characterized in that: A membrane tensioning ring (64) is fixedly installed on the floating ring (61).

8. A field water quality testing sampler according to claim 2, characterized in that: The sampler outer cylinder (1) is provided with a hook (11), a measuring rope is tied to the hook (11), and a water entry mark is also provided on the sampler outer cylinder (1); An indicator light is provided on the top of the water storage cavity (26), and a battery box for powering the indicator light is also provided in the water storage cavity (26).

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