CN117990422A - Open-air water quality testing sampler - Google Patents

Abstract

The invention discloses a field water quality detection sampler which comprises a sampler outer barrel, a center mechanism, a counterweight ring, a sampler upper cover, a first blocking mechanism and a floating assembly, wherein the center mechanism is screwed and fixed on the inner side of the bottom of the sampler outer barrel through threads, the counterweight ring is screwed and fixed on the outer side of the bottom of the sampler outer barrel through threads, the sampler upper cover is screwed and fixed on the upper end of the sampler outer barrel through threads, a plurality of exhaust holes are formed in the sampler upper cover, the center mechanism comprises a center outer barrel and a water inlet upright post, the center outer barrel is screwed and fixed on the bottom of the sampler outer barrel through threads, the first blocking mechanism is screwed and fixed on the inner side of the first blocking mechanism through threads, the water inlet upright post is fixedly connected with the top of the center outer barrel through a support plate, and the floating assembly is arranged in the water inlet upright post in a sliding manner.

Description

Open-air water quality testing sampler

Technical Field

The invention relates to the technical field of water quality sampling, in particular to a field water quality detection sampler.

Background

The water quality detection sampler is a device for collecting water quality samples, and in a field environment, the water quality detection sampler needs to be used for sampling water quality.

The water sample at the position of 0.5m below the water surface which is mainly taken in daily production work is generally put into water by the existing portable water quality sampler in the sampling process, sampling ports are formed in the upper end and the lower end of the sampler, the sampling ports are automatically opened when the sampler enters the water, the sampler is pulled out after the sampling is finished, the sampling ports are closed in the pulling-out process, the collected water sample is conveyed into a water sample bottle by utilizing a water outlet and a rubber tube to finish the sampling, the sampler is easily influenced by the height of the sampler when the sampler is immersed in the water in the process, the obtained water sample is easily mixed into other water samples in the upper and lower ranges of the position of 0.5m below the water surface, and further the water possibly mixed with surface water or deeper water at the bottom in the water sample can influence the water quality detection result.

Therefore, it is necessary to provide a field water quality detection sampler to solve the above-mentioned problems in the background art.

Disclosure of Invention

In order to achieve the above purpose, the present invention provides the following technical solutions: the outdoor water quality detection sampler comprises a sampler outer barrel, a center mechanism, a counterweight ring, a sampler upper cover, a first blocking mechanism and a floating assembly, wherein the center mechanism is screwed and fixed on the inner side of the bottom of the sampler outer barrel through threads, the counterweight ring is screwed and fixed on the outer side of the bottom of the sampler outer barrel through threads, the sampler upper cover is screwed and fixed on the upper end of the sampler outer barrel through threads, and a plurality of exhaust holes are formed in the sampler upper cover;

The center mechanism comprises a center outer cylinder and a water inlet upright post, wherein the center outer cylinder is screwed at the bottom of the outer cylinder of the sampler through threads, a first blocking mechanism is screwed at the inner side of the center outer cylinder through threads, the water inlet upright post is screwed at the inner side of the first blocking mechanism through threads, the water inlet upright post is fixedly connected with the top of the center outer cylinder through a support plate, and a floating assembly is slidably arranged in the water inlet upright post.

Preferably, the floating assembly comprises a floating ring, a second blocking mechanism and clamping plates, wherein the floating ring is slidably arranged in the water inlet upright post, the second blocking mechanism is screwed on the inner side of the floating ring through threads, a plurality of clamping plates are fixedly arranged on the outer side of the floating ring, and a water inlet channel is formed in each clamping plate;

the water inlet upright post and the support plate are provided with a plurality of water inlet grooves in a circumferential manner, and the clamping plate slides along the water inlet grooves in a sealing manner.

Preferably, the height of the water inlet upright post is smaller than 0.5m, and the height of the outer barrel of the sampler is larger than 0.5m;

The water inlet upright post and the central outer barrel jointly form an isolation bin, the central outer barrel and the sampler outer barrel jointly form a water storage cavity, and the water storage volume of the isolation bin is larger than the water inlet volume of the water inlet upright post;

The water storage cavity is internally and fixedly provided with a water temperature meter, the bottom of the water storage cavity is provided with a water outlet, the outside of the water outlet is connected with a rubber tube, and a water stop clamp is clamped on the rubber tube.

Preferably, the first blocking mechanism comprises an inner ring seat, an outer ring seat and a first blade, wherein the inner ring seat is screwed on the water inlet upright post through threads, the outer ring seat is screwed on the outer cylinder of the sampler through threads, a plurality of first sealing plates are fixedly arranged between the inner ring seat and the outer ring seat, a first rotating ring is rotatably arranged on the inner ring seat, a plurality of first blades are obliquely arranged on the first rotating ring in a circumferential direction, and the first blades are positioned between two adjacent first sealing plates.

Preferably, the upper side of the first blade is fixedly provided with a first extension plate, the bottom of the first blade is fixedly provided with a second extension plate, and the first extension plate and the second extension plate slide along the upper side and the lower side of the first adjacent two sealing plates respectively;

And the length of the first extension plate is longer than that of the second extension plate.

Preferably, the second blocking mechanism comprises a base, a rotating shaft and a second blade, wherein the base is screwed on the floating ring through threads, the rotating shaft is rotatably arranged on the base, a plurality of second sealing plates are arranged on the base at intervals, a plurality of second blades are obliquely arranged on the rotating shaft in a circumferential direction, and the second blades are located between two adjacent second sealing plates.

Preferably, an extension plate III is fixedly arranged on the upper side of the blade II, an extension plate IV is fixedly arranged at the bottom of the blade II, the extension plate III and the extension plate IV slide along the upper side and the lower side of two adjacent sealing plates II respectively, and a spring I is arranged between the extension plate IV and the sealing plates II;

and the length of the extension plate III is smaller than that of the extension plate IV.

Preferably, a film laying mechanism is fixedly arranged at the bottom of the water inlet upright post, and a film pulling ring is fixedly arranged on the floating ring.

Preferably, the film laying mechanism comprises a fixed seat, a film winding ring and an auxiliary wheel, wherein the fixed seat is fixedly arranged on the water inlet upright post, a sliding rod is fixedly arranged on the fixed seat, a sliding plate is arranged on the sliding rod in a sliding manner, a spring II is arranged between the sliding plate and the fixed seat, clamping rods are symmetrically arranged on the upper side and the lower side of the sliding plate in a rotating manner, a rubber wheel is arranged at the output end of the clamping rods in a rotating manner, an elastic pulling block is fixedly arranged between the two clamping rods, and the auxiliary wheel is rotatably arranged at one end, far away from the sliding rod, of the fixed seat;

the film winding ring is rotatably arranged between the auxiliary wheel and the two rubber wheels, and the two rubber wheels are synchronously driven by the waterproof motor.

Preferably, a hook is arranged on the outer barrel of the sampler, a measuring rope is bound on the hook, and a water inlet sign is also arranged on the outer barrel of the sampler;

the top of the water storage cavity is provided with an indicator lamp, and a battery box for supplying power to the indicator lamp is also arranged in the water storage cavity.

Compared with the prior art, the invention provides a field water quality detection sampler, which has the following beneficial effects:

according to the invention, the first blocking mechanism, the floating assembly and the second blocking mechanism are arranged, in the sampling process, the bottom of the isolation bin can be effectively sealed by the first blocking mechanism, so that a water sample can only enter the isolation bin through the floating assembly, then the water sample in the water inlet upright post is sealed by the second blocking mechanism, the isolation bin is preferentially filled with the water sample when the sampler is sampled, namely, the surface water completely enters the isolation bin, the isolation bin is sealed with the water inlet upright post by the film spreading mechanism, the water inlet depth of the sampler is limited at 0.5m below the water surface according to the water inlet mark, then the water sample at 0.5m enters the water storage cavity by the second blocking mechanism, the acquired water sample is completely the water sample at 0.5m, the accuracy of water quality detection is effectively improved, and the surface water in the isolation bin can be discharged again by the first blocking mechanism when the sampler is lifted, so that the lifting load of sampling personnel is reduced, and the convenience is effectively improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a schematic view of a floating assembly according to the present invention;

FIG. 3 is a schematic view of two parts of a blocking mechanism according to the present invention;

FIG. 4 is a schematic view of a blocking mechanism according to the present invention;

Fig. 5 is an enlarged schematic view of a portion a of fig. 1.

In the figure: 1. an outer barrel of the sampler; 11. a hook; 2. a central mechanism; 21. a central outer cylinder; 22. a water inlet upright post; 23. a support plate; 24. a water inlet tank; 25. an isolation bin; 26. a water storage cavity; 261. a water temperature meter; 262. a water outlet; 263. a rubber tube; 3. a counterweight ring; 4. a sampler upper cover; 41. an exhaust hole; 5. a first blocking mechanism; 51. an inner ring seat; 52. an outer ring seat; 53. a first blade; 531. an extension board I; 532. an extension plate II; 54. a first sealing plate; 6. a floatation assembly; 61. a floating ring; 62. a second blocking mechanism; 621. a base; 622. a rotating shaft; 623. a second blade; 634. a second sealing plate; 625. an extension plate III; 626. an extension plate II; 627. a first spring; 63. a clamping plate; 64. a film pulling ring; 7. a film laying mechanism; 71. a fixing seat; 72. a film rolling ring; 73. an auxiliary wheel; 74. a slide bar; 75. a slide plate; 76. a second spring; 77. a clamping rod; 78. rubber wheels.

Detailed Description

Examples: referring to fig. 1 to 5, in the embodiment of the invention, a field water quality detection sampler includes a sampler outer barrel 1, a central mechanism 2, a counterweight ring 3, a sampler upper cover 4, a blocking mechanism 5 and a floating assembly 6, wherein the central mechanism 2 is screwed and fixed on the inner side of the bottom of the sampler outer barrel 1 through threads, the counterweight ring 3 is screwed and fixed on the outer side of the bottom of the sampler outer barrel 1 through threads, the sampler upper cover 4 is screwed and fixed on the upper end of the sampler outer barrel 1 through threads, and a plurality of exhaust holes 41 are formed in the sampler upper cover 4;

The center mechanism 2 comprises a center outer cylinder 21 and a water inlet upright post 22, wherein the center outer cylinder 21 is screwed at the bottom of the sampler outer cylinder 1 through threads, a first blocking mechanism 5 is screwed on the inner side of the center outer cylinder 21 through threads, the water inlet upright post 22 is screwed on the inner side of the first blocking mechanism 5 through threads, the water inlet upright post 22 is fixedly connected with the top of the center outer cylinder 21 through a support plate 23, and a floating assembly 6 is slidably arranged in the water inlet upright post 22.

In the implementation, the adoption device is slowly put into water, a water inlet sign on the outer barrel 1 of the sampling device is observed, so that the height from the bottom of the outer barrel 1 of the sampling device to the water surface is 0.5m, in the process, a water sample can enter through the water inlet upright post 22 and push the floating assembly 6 to slide upwards, then the water sample is blocked by the blocking mechanism II 62 and flows into the isolation bin 25 from the water inlet channel 65 on the clamping plate 63, along with the continuous entering of the water sample, the water level in the isolation bin 25 is gradually raised and pushes the floating assembly 6 to slide upwards until the floating assembly 6 contacts the support plate 23 and blocks the water inlet groove 24 at the top of the support plate 23, meanwhile, the floating assembly 6 utilizes the film spreading mechanism 7 to spread a waterproof film on the water inlet upright post 22 in the floating process, the water inlet groove 24 on the water inlet upright post 22 is blocked, so that the isolation bin 25 is in a closed state completely, the surface water is completely conveyed into the isolation bin 25 and sealed, the acquired water sample is not doped with the surface water, the accuracy of water quality detection is effectively improved, then along with the continuous increase of water pressure, the water sample can squeeze the blade two 623 in the isolation mechanism two 62, when the extrusion force is larger than the supporting force of the spring one 627, the blade two 623 deflects to open the isolation mechanism two 62, the water sample at the position of 0.5m enters the water storage cavity 26, after the water sample fills the water storage cavity 26, the water sample contacts the bottom of the indicator lamp to conduct a circuit, the sampling personnel is reminded to finish sampling, the outer barrel 1 of the sampler is lifted upwards out of the water surface, in the process, the water sample in the isolation bin 25 applies pressure downwards to deflect the blade one 53 in the isolation mechanism one 5, the isolation mechanism one 5 is opened, and the water sample in the isolation bin 25 flows out, effectively lighten the lifting load of sampling personnel, and then the obtained water sample is injected into the water sample bottle through the rubber tube 263 to finish sampling.

In this embodiment, as shown in fig. 2 and 5, the floating assembly 6 includes a floating ring 61, a second blocking mechanism 62 and a clamping plate 63, wherein the floating ring 61 is slidably disposed in the water inlet upright 22, the second blocking mechanism 62 is screwed on the inner side of the floating ring 61 by threads, a plurality of clamping plates 63 are fixedly disposed on the outer side of the floating ring 61, and a water inlet channel 65 is formed in the clamping plate 63;

the water inlet upright post 22 and the support plate 23 are provided with a plurality of water inlet grooves 24 in a circumferential manner, and the clamping plates 63 slide along the water inlet grooves 24 in a sealing manner.

When the device is implemented, the floating assembly 6 can slide upwards through buoyancy after water enters the water inlet upright post 22, the water inlet upright post 22 and the isolation bin 25 are separated into two spaces, namely, the water sample is guaranteed to be gradually conveyed through the bottom of the isolation bin 25 until the isolation bin 25 is full of the water sample, further, the surface water of the water inlet collector is guaranteed to be preferentially and completely enter the isolation bin 25 during sampling, the isolation bin 25 is completely sealed after the water sample is full through the film laying mechanism 7 and the clamping plate 63, the surface water sample is effectively prevented from being mixed with the water sample at the position of 0.5m, and the obtained water sample is guaranteed to be the water sample at the position of 0.5 m.

In this embodiment, the height of the water inlet upright post 22 is less than 0.5m, and the height of the sampler outer barrel 1 is greater than 0.5m;

The water inlet upright post 22 and the central outer barrel 21 jointly form an isolation bin 25, the central outer barrel 21 and the sampler outer barrel 1 jointly form a water storage cavity 26, and the water storage volume of the isolation bin 25 is larger than the water inlet volume of the water inlet upright post 22;

The water temperature meter 261 is fixedly arranged in the water storage cavity 26, a water outlet 262 is arranged at the bottom of the water storage cavity 26, a rubber tube 263 is connected to the outside of the water outlet 262, and a water stop clamp is clamped on the rubber tube 263.

In particular, the height of the outer barrel 1 of the sampler is set to be greater than 0.5m, the height of the water inlet upright post 22 is set to be less than 0.5m, so that the sampler is not required to be entirely put into water during sampling, sampling can be completed by only placing the bottom of the outer barrel 1 of the sampler at the position of 0.5m below the water surface according to a water inlet mark, the sampling process is more convenient, the water inlet depth of the sampler is limited at the position of 0.5m, the water sample entering the sampler is ensured to be the water sample at the position of 0.5m, the volume of the isolation bin 25 is greater than the water inlet volume of the water inlet upright post 22, surface water entering the water inlet upright post 22 can be ensured to completely enter the isolation bin 25, and the obtained water sample of 0.5m is ensured not to be mixed with the surface water.

In this embodiment, as shown in fig. 4, the first blocking mechanism 5 includes an inner ring seat 51, an outer ring seat 52 and a first vane 53, where the inner ring seat 51 is screwed on the water inlet column 22 by threads, the outer ring seat 52 is screwed on the outer cylinder 1 of the sampler by threads, a plurality of first sealing plates 54 are fixedly disposed between the inner ring seat 51 and the outer ring seat 52, a first swivel 55 is rotatably disposed on the inner ring seat 51, a plurality of first vanes 53 are disposed on the first swivel 55 in a circumferential inclined manner, and the first vane 53 is located between two adjacent first sealing plates 54.

In this embodiment, as shown in fig. 4, an extension plate one 531 is fixedly disposed on the upper side of the first blade 53, an extension plate two 532 is fixedly disposed on the bottom of the first blade 53, and the extension plate one 531 and the extension plate two 532 slide along the upper side and the lower side of the two adjacent sealing plates one 54 respectively;

And, the length of the first extension plate 531 is greater than the length of the second extension plate 532.

When the sampler enters underwater, the first blade 53 is subjected to upward water pressure, so that the first blade 53 rotates clockwise, the second extension plate 532 is tightly attached to the first sealing plate 54, the first blocking mechanism 5 is in a closed state, a water sample cannot enter from the bottom of the isolation bin 25, when the sampler is sampled and pulled up to the outer barrel 1 of the sampler, the first blade 53 is subjected to downward pressure, so that the first blade 53 rotates anticlockwise, the second extension plate 532 is separated from the first sealing plate 54, the first blocking mechanism 5 is opened, surface water in the isolation bin 25 is discharged, the water sample is isolated when the isolation bin 25 is sampled, the working process of discharging the surface water after the sampling is completed, and the lifting load of sampling personnel is effectively reduced.

In this embodiment, as shown in fig. 2 and 3, the second blocking mechanism 62 includes a base 621, a rotating shaft 622 and a second vane 623, where the base 621 is screwed on the floating ring 61 by threads, the rotating shaft 622 is rotatably disposed on the base 621, a plurality of second sealing plates 624 are disposed on the base 621 at intervals, the rotating shaft 622 is provided with a plurality of second vanes 623 in a circumferential inclined manner, and the second vane 623 is located between two adjacent second sealing plates 624.

In this embodiment, as shown in fig. 2 and 3, an extension plate three 625 is fixedly arranged on the upper side of the second blade 623, an extension plate four 626 is fixedly arranged on the bottom of the second blade 623, the extension plate three 625 and the extension plate four 626 slide along the upper side and the lower side of the two adjacent sealing plates two 624 respectively, and a first spring 627 is arranged between the extension plate four 626 and the sealing plates two 624;

And, the length of the third extension plate 625 is smaller than the length of the fourth extension plate 626.

In implementation, when a water sample enters the water inlet upright post 22, the water sample is preferentially propped against the floating assembly 6 and flows into the isolation bin 25 through the water flow channel, at this time, because the water pressure in the water sample flowing into the isolation bin 25 is smaller than the supporting force of the first spring 627, the second blade 623 is not deflected, the second blocking mechanism 62 is always in a closed state, when the isolation bin 25 is full of the water sample, the water pressure is increased, and then the second blade 623 is pressed to deflect the second blade 623 clockwise, and further the third extension plate 625 is separated from the second sealing plate 624, so that the second blocking mechanism 62 is opened, the water sample passes through the second blocking mechanism 62 and flows into the water storage cavity 26, and further the water sample is guaranteed to be filled in the isolation bin 25 after the water sample enters the water inlet upright post 22, namely, the surface water is isolated through the isolation bin 25, and the water sample obtained in the water storage cavity 26 is guaranteed to be the water sample at the position of 0.5 m.

In this embodiment, as shown in fig. 5, the bottom of the water inlet upright post 22 is fixedly provided with a film laying mechanism 7, and the floating ring 61 is fixedly provided with a film pulling ring 64.

In this embodiment, as shown in fig. 5, the film laying mechanism 7 includes a fixing seat 71, a film winding ring 72 and an auxiliary wheel 73, wherein the fixing seat 71 is fixedly disposed on the water inlet upright 22, a sliding rod 74 is fixedly disposed on the fixing seat 71, a sliding plate 75 is slidably disposed on the sliding rod 74, a second spring 76 is disposed between the sliding plate 75 and the fixing seat 71, clamping rods 77 are symmetrically disposed on the upper and lower sides of the sliding plate 75 in a rotating manner, a rubber wheel 78 is disposed on the output end of the clamping rods 77 in a rotating manner, an elastic pull block is fixedly disposed between the two clamping rods 77, and the auxiliary wheel 73 is rotatably disposed on one end of the fixing seat 71 far away from the sliding rod 74;

The film winding ring 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.

When the floating ring 61 slides upwards, the film pulling ring 64 can pull the waterproof film, the waterproof film is paved on the water inlet upright post 22, the water inlet groove 24 on the water inlet upright post 22 is further sealed, the water sample in the isolation bin 25 is sealed and isolated after entering, the water sample entering the water inlet upright post 22 at the position of 0.5m is effectively prevented from being polluted by surface water, after sampling is finished, the water sample in the isolation bin 25 flows out through the first blocking mechanism 5, at the moment, the floating ring 61 slides downwards, the waterproof motor is started to enable the two rubber wheels 78 to rotate and drive the film rolling ring 72 to rotate under the action of friction force, the waterproof film is further retracted again, the outer part of the film rolling ring 72 is changed along with the change when the waterproof film is retracted, the sliding plate 75, the second spring 76 and the elastic pulling block are arranged, the rubber wheels 78 can be effectively attached to the film rolling ring 72, the waterproof film can be effectively retracted, and convenience of the sampler is further improved.

In this embodiment, as shown in fig. 1, a hook 11 is disposed on the outer barrel 1 of the sampler, a measuring rope is bound on the hook 11, and a water inlet sign is also disposed on the outer barrel 1 of the sampler;

an indicator lamp is arranged at the top of the water storage cavity 26, and a battery box for supplying power to the indicator lamp is further arranged in the water storage cavity 26.

In summary, in the implementation of the invention, the bottom of the sampler is only required to be placed at the position of 0.5m under water to finish sampling, and the entering surface water can be effectively isolated in the isolation bin 25 through the floating assembly 6, the first blocking mechanism 5, the second blocking mechanism 62 and the film laying mechanism 7, so that the water sample at the position of 0.5m in the water storage cavity 26 is ensured, the quality of the water sample is effectively improved, and the accuracy of water quality detection is improved.

The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (10)

1. A field water quality detection sampler is characterized in that: the novel sampler comprises a sampler outer barrel (1), a center mechanism (2), a counterweight ring (3), a sampler upper cover (4), a first blocking mechanism (5) and a floating assembly (6), wherein the center mechanism (2) is screwed and fixed on the inner side of the bottom of the sampler outer barrel (1) through threads, the counterweight ring (3) is screwed and fixed on the outer side of the bottom of the sampler outer barrel (1) through threads, the sampler upper cover (4) is screwed and fixed on the upper end of the sampler outer barrel (1) through threads, and a plurality of exhaust holes (41) are formed in the sampler upper cover (4);

The center mechanism (2) comprises a center outer cylinder (21) and a water inlet upright (22), wherein the center outer cylinder (21) is screwed at the bottom of the sampler outer cylinder (1) through threads, a first blocking mechanism (5) is screwed on the inner side of the center outer cylinder (21) through threads, the water inlet upright (22) is screwed on the inner side of the first blocking mechanism (5) through threads, the water inlet upright (22) is fixedly connected with the top of the center outer cylinder (21) through a support plate (23), and a floating assembly (6) is slidably arranged in the water inlet upright (22).

2. The field water quality detection sampler of claim 1, wherein: the floating assembly (6) comprises a floating ring (61), a second blocking mechanism (62) and clamping plates (63), wherein the floating ring (61) is slidably arranged in the water inlet upright post (22), the second blocking mechanism (62) is screwed on the inner side of the floating ring (61) through threads, a plurality of clamping plates (63) are fixedly arranged on the outer side of the floating ring (61), and a water inlet channel (65) is formed in each clamping plate (63);

A plurality of water inlet grooves (24) are formed in the circumference of the water inlet upright post (22) and the support plate (23), and the clamping plates (63) slide along the water inlet grooves (24) in a sealing mode.

3. The field water quality detection sampler of claim 1, wherein: the height of the water inlet upright post (22) is smaller than 0.5m, and the height of the sampler outer barrel (1) is larger than 0.5m;

the water inlet upright post (22) and the central outer barrel (21) jointly form an isolation bin (25), the central outer barrel (21) and the sampler outer barrel (1) jointly form a water storage cavity (26), and the water storage volume of the isolation bin (25) is larger than the water inlet volume of the water inlet upright post (22);

the water storage device is characterized in that a water temperature meter (261) is fixedly arranged in the water storage cavity (26), a water outlet (262) is formed in the bottom of the water storage cavity (26), a rubber pipe (263) is connected to the outside of the water outlet (262), and a water stop clamp is clamped on the rubber pipe (263).

4. A field water quality testing sampler according to claim 3 and wherein: the first blocking mechanism (5) comprises an inner ring seat (51), an outer ring seat (52) and a first vane (53), wherein the inner ring seat (51) is screwed on the water inlet upright post (22) through threads, the outer ring seat (52) is screwed on the outer sampler barrel (1) through threads, a plurality of first sealing plates (54) are fixedly arranged between the inner ring seat (51) and the outer ring seat (52), a first swivel (55) is rotatably arranged on the inner ring seat (51), a plurality of first vanes (53) are obliquely arranged on the first swivel (55) in a circumferential direction, and the first vane (53) is positioned between two adjacent first sealing plates (54).

5. The field water quality detection sampler of claim 4, wherein: an extension plate I (531) is fixedly arranged on the upper side of the blade I (53), an extension plate II (532) is fixedly arranged on the bottom of the blade I (53), and the extension plate I (531) and the extension plate II (532) slide along the upper side and the lower side of two adjacent sealing plates I (54) respectively;

And, the length of the first extension plate (531) is longer than the length of the second extension plate (532).

6. The field water quality detection sampler of claim 2, wherein: the second blocking mechanism (62) comprises a base (621), a rotating shaft (622) and a second blade (623), wherein the base (621) is screwed on the floating ring (61) through threads, the rotating shaft (622) is rotatably arranged on the base (621), a plurality of second sealing plates (624) are arranged on the base (621) at intervals, a plurality of second blades (623) are obliquely arranged on the rotating shaft (622) in a circumferential direction, and the second blades (623) are located between two adjacent second sealing plates (624).

7. The field water quality detection sampler of claim 6, wherein: an extension plate III (625) is fixedly arranged on the upper side of the second blade (623), an extension plate IV (626) is fixedly arranged on the bottom of the second blade (623), the extension plate III (625) and the extension plate IV (626) slide along the upper side and the lower side of the two adjacent sealing plate II (624) respectively, and a spring I (627) is arranged between the extension plate IV (626) and the sealing plate II (624);

And, the length of the extension plate III (625) is smaller than the length of the extension plate IV (626).

8. The field water quality detection sampler of claim 2, wherein: the bottom of the water inlet upright post (22) is fixedly provided with a film laying mechanism (7), and the floating ring (61) is fixedly provided with a film pulling ring (64).

9. The field water quality detection sampler of claim 8, wherein: the film laying mechanism (7) comprises a fixed seat (71), a film winding ring (72) and auxiliary wheels (73), wherein the fixed seat (71) is fixedly arranged on the water inlet upright post (22), a sliding rod (74) is fixedly arranged on the fixed seat (71), a sliding plate (75) is arranged on the sliding rod (74) in a sliding mode, a spring II (76) is arranged between the sliding plate (75) and the fixed seat (71), clamping rods (77) are symmetrically arranged on the upper side and the lower side of the sliding plate (75) in a rotating mode, rubber wheels (78) are arranged at the output end of the clamping rods (77) in a rotating mode, elastic pulling blocks are fixedly arranged between the two clamping rods (77), and the auxiliary wheels (73) are rotatably arranged at one end, far away from the sliding rod (74), of the fixed seat (71);

The film winding ring (72) is rotatably arranged between the auxiliary wheel (73) and the two rubber wheels (78), and the two rubber wheels (78) are synchronously driven by a waterproof motor.

10. A field water quality testing sampler according to claim 3 and wherein: a hook (11) is arranged on the sampler outer barrel (1), a measuring rope is bound on the hook (11), and a water inlet sign is also arranged on the sampler outer barrel (1);

An indicator lamp is arranged at the top of the water storage cavity (26), and a battery box for supplying power to the indicator lamp is further arranged in the water storage cavity (26).