Online rapid water quality sampling and detecting device and method of use thereof

Abstract

The application relates to an online rapid water quality sampling and detecting device and a use method thereof, relates to the field of environmental protection detection, and comprises a detecting device, a sampler and an opening and closing assembly. A plurality of sampling cavities are arranged on the side wall of the sampler in the vertical direction. A water storage cavity is arranged below the sampling cavities and is communicated with the sampling cavities. A baffle is hingedly connected to one side of the sampling cavity away from the axis of the sampler, and the baffle corresponds to the sampling cavity in one-to-one mode. A moving groove is arranged at the bottom of the sampler. The opening and closing assembly comprises a floating block and a pushing piece. The floating block is sealingly and slidingly connected in the moving groove and is driven by water pressure. The floating block drives the baffle to rotate through the pushing piece. The application has the effects of conveniently sampling and detecting water bodies at different depths for detection personnel and improving the efficiency of the water quality sampling and detecting device.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection detection, in particular to an online rapid water quality sampling detection device and a use method thereof. BACKGROUND

[0002] Water is an important resource of the natural environment, which is closely related to our life, but its pollution problem is gradually serious. Water quality detection is one of the main means of water resource protection and pollution control, so water quality detection gradually arises and is widely applied. Water quality detection is mainly used in the detection of industrial water, water treatment and drinking water. Conventional water quality detection not only provides water safety for us, but also provides scientific basis and guidance for environmental protection and production quality.

[0003] The currently commonly used online water quality sampling detection device usually includes a sampler and a detection device. The sampler includes a traction rope and a sampling container. The detection personnel controls the traction rope to make the sampling container sink to a certain depth of the water body to sample the water body. After sampling is completed, the sampling container is retrieved, and the collected water body is detected by using the detection device. The detection personnel can sample the water body at different depths by changing the length of the traction rope, so as to more comprehensively and accurately detect the water body.

[0004] According to the related technology in the above, the inventor believes that the detection personnel needs to perform multiple operations when sampling the water body at different depths, which is laborious and time-consuming, and reduces the sampling efficiency of the online water quality sampling detection device. SUMMARY

[0005] In order to facilitate the detection personnel to sample the water body at different depths, the present application provides an online rapid water quality sampling detection device and a use method thereof.

[0006] The online rapid water quality sampling detection device and the use method thereof provided by the present application adopt the following technical solutions:

[0007] In a first aspect, the present application provides an online rapid water quality sampling detection device, which adopts the following technical solutions:

[0008] An online rapid water quality sampling detection device, comprising a detection device, a sampler and an opening and closing assembly, a plurality of sampling cavities are arranged on the side wall of the sampler in the vertical direction, a water storage cavity is arranged below the sampling cavity, the water storage cavity is in communication with the sampling cavity, a baffle is hinged to one side of the sampling cavity away from the axis of the sampler, the baffle corresponds to the sampling cavity one by one, a moving groove is arranged at the bottom of the sampler, the opening and closing assembly comprises a floating block and a pushing piece, the floating block is sealingly and slidingly connected in the moving groove and is driven by water pressure, and the floating block drives the baffle to rotate through the pushing piece.

[0009] By adopting the technical scheme, the sampler is sunk into the water body to be detected, and as the sampler sinks, the water pressure on the floating block increases, driving the floating block to move upwards, so that the baffles are opened in sequence, and the water samples at different depths are introduced into the water storage cavity from the corresponding sampling cavities, thereby completing the sampling of the water body at different depths without the need for multiple operations, saving time and effort.

[0010] Optionally, the pushing member comprises a rack that moves synchronously with the floating block, a gear that is in meshing connection with the rack, and a pushing rod that is in threaded connection with the gear, the sampling cavity is provided with an accommodating cavity and a clearance cavity for sliding of the rack on the side close to the axis of the sampler, the accommodating cavity is in communication with the clearance cavity, the gear is in rotary connection in the accommodating cavity, the side wall of the baffle close to the accommodating cavity is provided with a sliding groove, the sliding groove is in sliding connection with a sliding block, and the end of the pushing rod away from the gear is hinged to the sliding block.

[0011] By adopting the technical scheme, as the rack moves upwards from the bottom of the clearance cavity along with the floating block, the gear is driven to rotate, so that the pushing rod moves away from the axis of the sampler, the baffle is pushed open, and the water body can enter the sampling cavity, and at the same time, as the floating block moves downwards along with the sampler, the water body at different depths enters different sampling cavities.

[0012] Optionally, a coil spring is arranged between the gear and the side wall of the accommodating cavity, one end of the coil spring is in fixed connection with the gear, and the other end is in fixed connection with the side wall of the accommodating cavity.

[0013] By adopting the technical scheme, when the rack continues to move upwards along with the floating block and is no longer in meshing connection with the gear below, the gear reversely rotates under the resetting action of the coil spring, so that the pushing rod moves towards the axis of the sampler, thereby driving the baffle to close the sampling cavity, so as to avoid the mixing of the water body at different depths as much as possible and ensure the accuracy of sampling.

[0014] Optionally, the rack is made of a magnetic material, and the floating block is an electromagnet.

[0015] By adopting the technical scheme, as the current of the electromagnet is greater, the magnetism of the electromagnet is stronger, so that the rack can move upwards and downwards along with the floating block and has high stability.

[0016] Optionally, a filter assembly is arranged in the sampling cavity, the filter assembly comprises a filter plate, and a plurality of filter holes are arranged on the filter plate.

[0017] By adopting the technical scheme, the filter plate can filter the impurities in the water body, reducing the possibility of clogging of the water storage cavity by the impurities.

[0018] Optionally, an avoiding groove is arranged on the inner wall of the filter hole, a blocking plate is slidably connected in the avoiding groove, the blocking plate is fixedly connected with the push rod through a fixing rope near the sidewall of the bottom of the avoiding groove, and a return spring is fixedly installed between the blocking plate and the inner bottom wall of the avoiding groove.

[0019] By adopting the above technical scheme, when the push rod moves away from the axis of the sampler to push the baffle open, the fixed rope is pulled to slide the blocking plate into the avoiding groove, and the filter hole is opened; when the push rod moves towards the axis of the sampler to close the baffle, the blocking plate closes the filter hole under the action of the return spring, thereby enhancing the airtightness of the water storage cavity.

[0020] Optionally, an installation groove is arranged on the upper inner wall of the water storage cavity, a partition plate is slidably connected in the installation groove, and the partition plate is fixedly connected with the push rod through a connecting rod.

[0021] By adopting the above technical scheme, when the push rod moves to push the baffle open, the connecting rod can drive the partition plate to move, so that the water storage cavity is connected with the sampling cavity; when the push rod drives the baffle to close the sampling cavity, the partition plate moves to block the water storage cavity, thereby further enhancing the airtightness of the water storage cavity.

[0022] Optionally, each sampling cavity is circumferentially provided with a plurality of sampling cavities along the axis of the sampler.

[0023] By adopting the above technical scheme, multiple water samples can be collected at the same depth for detection at the same time, thereby enhancing the reliability of detection data.

[0024] Optionally, the detection device comprises a plurality of detection probes and a display screen, the detection probes are fixedly installed in the water storage cavity and correspond to the water storage cavity one by one, and the plurality of detection probes are electrically connected with the display screen.

[0025] By adopting the above technical scheme, the water body in the water storage cavity can be detected in time, and detection personnel can know the detection parameters of water samples at different depths from the display screen, so that detection is more convenient and fast.

[0026] In a second aspect, the application provides a use method of an online rapid water quality sampling and detecting device, which adopts the following technical scheme:

[0027] A use method of an online rapid water quality sampling and detecting device, comprising the following steps:

[0028] S1, sinking the sampler into a water body to be detected, so that the floating block moves upward under the driving of the water pressure;

[0029] S2, when the floating block is at the same level as a sampling chamber, the baffle corresponding to the sampling chamber is opened, and the filter hole is opened, the water storage chamber is communicated with the sampling chamber, and the water to be detected enters the water storage chamber for detection;

[0030] S3, the floating block continues to move upwards, and the baffle below the floating block is closed;

[0031] S4, the sampler is taken out of the water, and the collected water sample is poured out of the water storage chamber.

[0032] By adopting the above technical scheme, the sampler is immersed in the water to be detected, as the water pressure increases, the floating block moves upwards, and the sampling chamber is opened from bottom to top in sequence, different depths of water enter different sampling chambers, and the detection personnel can obtain detection data of water at different depths without putting the sampler into the water multiple times, time and labor are saved, and the efficiency of the water quality sampling and detection device is improved.

[0033] In summary, the present application has at least one of the following beneficial technical effects:

[0034] 1. As the rack moves upwards from the bottom of the floating block, the gear is driven to rotate, so that the push rod moves away from the axis of the sampler, the baffle is pushed open, and the water can enter the sampling chamber. When the rack continues to move upwards with the floating block and is no longer engaged with the gear below, the gear reverses its rotation under the restoring action of the coil spring, causing the push rod to move towards the axis of the sampler, thereby driving the baffle to close the sampling chamber, thereby avoiding mixing of water at different depths and ensuring the accuracy of sampling;

[0035] 2. When the push rod pushes the baffle open, it can pull the fixed rope to make the blocking plate slide into the avoidance slot, and the filter hole is opened; when the push rod moves to close the sampling chamber with the baffle, the blocking plate closes the filter hole under the action of the restoring spring, thereby enhancing the airtightness of the water storage chamber;

[0036] 3. The sampler is immersed in the water to be detected, as the water pressure increases, the floating block moves upwards, and the sampling chamber is opened from bottom to top in sequence, different depths of water enter different sampling chambers, and the detection personnel can obtain detection data of water at different depths without putting the sampler into the water multiple times, time and labor are saved, and the efficiency of the water quality sampling and detection device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 is a structural schematic diagram of an online rapid water quality sampling and detection device according to an embodiment of the present application;

[0038] Figure 2 is a sectional view of an online rapid water quality sampling and detection device according to an embodiment of the present application;

[0039] Figure 3 is Figure 2 Enlarged view of part A;

[0040] Figure 4 It is a schematic diagram of the rack structure of the online rapid water quality sampling and detection device according to an embodiment of the present application.

[0041] Explanation of the accompanying symbols: 1. Detection equipment; 11. Detection probe; 12. Display screen; 2. Sampler; 21. Sampling chamber; 211. Baffle; 2111. Sliding groove; 2112. Slider; 22. Water storage chamber; 221. Drain hole; 23. Moving groove; 24. Accommodating chamber; 25. Give way chamber; 26. Mounting groove; 261. Partition; 262. Connecting rod; 3. Opening and closing assembly; 31. Floating block; 32. Pushing member; 321. Rack; 322. Gear; 323. Pushing rod; 324. Coil spring; 4. Filter assembly; 41. Filter plate; 411. Filter hole; 412. Avoidance groove; 42. Sealing plate; 43. Reset spring; 44. Fixing rope; 5. Sampling rope. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-4 This application is described in further detail.

[0043] The embodiment of the present application discloses an online rapid water quality sampling and detection device.

[0044] Reference Figure 1 and Figure 2 The embodiment of the present application discloses an online rapid water quality sampling and testing device comprising a testing device 1, a sampler 2, an opening and closing assembly 3, and a filtering assembly 4. The testing device 1 comprises a detection probe 11 for detecting water quality and a display screen 12 electrically connected to the detection probe 11. The detection probe 11 is fixedly mounted on the sampler 2. The opening and closing assembly 3 and the filtering assembly 4 are also disposed on the sampler 2. In this embodiment, the sampler 2 is cylindrical and has a large weight. It can sink to a depth in the water body to be tested. A sampling rope 5 is fixedly connected to the top of the sampler 2. The testing personnel can control the depth to which the sampler 2 sinks into the water body by manipulating the sampling rope 5.

[0045] The side wall of the sampler 2 is provided with a plurality of sampling cavities 21 in the vertical direction, which are used to hold water samples at different depths, and each sampling cavity 21 is circumferentially provided with a plurality of sampling cavities along the axis of the sampler 2, so that the sampler 2 can collect multiple samples at the same depth for detection, thereby enhancing the accuracy and reliability of the water quality detection data. The sampling cavity 21 is provided with a baffle plate 211 on the side away from the axis of the sampler 2, the baffle plate 211 is hinged to the inner wall of the sampling cavity 21, and the baffle plate 211 corresponds to the sampling cavity 21 one by one. The sampling cavity 21 is provided with a water storage cavity 22 on the side close to the bottom of the sampler 2, the water storage cavity 22 is in communication with the sampling cavity 21. The detection probe 11 is installed on the inner wall of the water storage cavity 22, which can realize online real-time detection of the water body. The water storage cavity 22 is provided with a through drainage hole 221 on the side wall away from the sampler 2, a rubber plug is tightly embedded in the drainage hole 221, and the rubber plug is pulled out after detection, and the water sample can be discharged from the drainage hole 221.

[0046] The opening and closing assembly 3 includes a floating block 31 and a pusher 32, and the bottom of the sampler 2 is provided with a moving groove 23 in the vertical direction, and the floating block 31 is sealingly and slidably connected in the moving groove 23. Before the sampler 2 is put into the water body to be detected, the floating block 31 is located at the lower part of the sampler 2, as the depth of the sampler 2 gradually increases in the water body to be detected, the water pressure increases, and the floating block 31 gradually moves along the setting direction of the moving groove 23 to the direction close to the top of the sampler 2.

[0047] Referring to Figure 2 , Figure 3 and Figure 4 , the pusher 32 is arranged in the sampler 2 and corresponds to the sampling cavity 21 one by one. The sampling cavity 21 is provided with an accommodating cavity 24 and a displacement cavity 25 on the side close to the axis of the sampler 2, the accommodating cavity 24 corresponds to the sampling cavity 21 one by one, and is in communication with the displacement cavity 25, and the displacement cavity 25 is arranged in a back shape in the vertical direction. The pusher 32 includes a rack 321, a gear 322, a push rod 323 and a coil spring 324, wherein the length of the rack 321 is greater than the height of the accommodating cavity 24, the rack 321 is slidably connected in the displacement cavity 25, the gear 322 and the coil spring 324 are arranged in the accommodating cavity 24, the gear 322 is rotatably connected to the accommodating cavity 24, one end of the coil spring 324 is fixedly connected to the gear 322, and the other end is fixedly connected to the side wall of the accommodating cavity 24 close to the sampling cavity 21. The push rod 323 is a threaded rod, one end of the push rod 323 is threadedly connected to the gear 322, and the other end is connected with the baffle plate 211. The side wall of the baffle plate 211 close to the sampling cavity 21 is provided with a sliding groove 2111 in the vertical direction, a sliding block 2112 is slidably connected in the sliding groove 2111, and the push rod 323 is hinged to the sliding block 2112.

[0048] It should be noted that the rack 321 is made of magnetic material, and the floating block 31 is an electromagnet, because the greater the current through the electromagnet, the stronger the magnetism, so when the floating block 31 moves, it can drive the rack 321 to move stably and synchronously, that is, as the depth of the sampler 2 increases, the floating block 31 can drive the rack 321 to move upwards. Thus, when the rack 321 moves upwards to engage with the gear 322, the gear 322 can be driven to rotate, and the push rod 323 moves away from the moving groove 23, pushing the baffle 211 to open, so that the water enters the sampling cavity 21 and flows into the water storage cavity 22 for detection; when the rack 321 continues to move upwards with the floating block 31 to disengage from the gear 322, the gear 322 reverses rotation under the resetting action of the coil spring 324, and the push rod 323 moves towards the moving groove 23, so that the baffle 211 closes the sampling cavity 21, and the water cannot enter the sampling cavity 21, thereby avoiding the mixing of water bodies at different depths as much as possible, and ensuring the accuracy of the data.

[0049] In addition, when the rack 321 moves to the top of the accommodation cavity 25 with the floating block 31, the sampling is completed, the sampler 2 is taken out of the water body, the floating block 31 is no longer energized, and the magnetism disappears. At this time, the rubber plug can be removed, the sampler 2 is tilted, the water in the water storage cavity 22 is discharged, and the rack 321 can be moved to the side away from the moving groove 23 of the accommodation cavity 25, and the rack 321 falls back to the bottom of the sampler 2. It should be noted that the moving groove 23 is filled with gas, and when the sampler 2 sinks, the water pressure is large enough to compress the gas. After the sampler 2 is taken out of the water body, the floating block 31 falls back to the bottom of the sampler 2 under the resetting action of the gas. It should be noted that the depth of the water samples collected in the water storage cavity 22 from top to bottom gradually decreases.

[0050] In order to ensure the sealing of the water storage cavity 22, the inner wall of the upper part of the water storage cavity 22 is provided with a mounting groove 26 in the horizontal direction, and a partition plate 261 is slidably connected in the mounting groove 26. The partition plate 261 is fixedly connected with the push rod 323 through a connecting rod 262. When the push rod 323 moves away from the moving groove 23 to push open the baffle 211, the connecting rod 262 pushes the partition plate 261 into the mounting groove 26 with the push rod 323, so that the water storage cavity 22 is connected with the sampling cavity 21, and the water can smoothly enter the water storage cavity 22 from the sampling cavity 21; when the push rod 323 drives the baffle 211 to close, the connecting rod 262 drives the partition plate 261 to move to separate the water storage cavity 22 from the sampling cavity 21, further reducing the possibility of mixing of water samples at different depths.

[0051] The filtering assembly 4 comprises a filter plate 41, a blocking plate 42, a reset spring 43 and a fixing rope 44. The filter plate 41 is fixedly installed in the sampling cavity 21 and the side wall thereof is in close contact with the inner wall of the sampling cavity 21. A plurality of filter holes 411 are formed in the filter plate 41. An avoiding groove 412 is arranged on the inner wall of the filter hole 411. One end of the reset spring 43 is fixedly connected to the inner bottom wall of the avoiding groove 412, and the other end is fixedly connected to the blocking plate 42. In the embodiment, the cross sections of the blocking plate 42 and the filter hole 411 are circular. The blocking plate 42 can completely close the filter hole 411. One end of the fixing rope 44 is fixedly connected to one side of the blocking plate 42 close to the reset spring 43, and the other end is fixedly connected to the push rod 323. It should be noted that the filter plate 41 is arranged on the side of the sampling cavity 21 close to the baffle 211, so that the water body entering the sampling cavity 21 can first pass through the filter plate 41 before entering the water storage cavity 22, thereby reducing the situation that the detection probe 11 cannot normally detect due to impurities entering the water storage cavity 22.

[0052] When the push rod 323 pushes away the baffle 211, the fixing rope 44 moves and pulls the blocking plate 42 into the avoiding groove 412, so that the filter hole 411 is opened and the water sample entering the sampling cavity 21 is filtered. When the baffle 211 closes the sampling cavity 21, the blocking plate 42 moves away from the bottom of the avoiding groove 412 under the reset action of the reset spring 43, so that the filter hole 411 is in a closed state, thereby further ensuring the airtightness of the water storage cavity 22.

[0053] The implementation principle of the online rapid water quality sampling and detecting device is as follows. The detection personnel sinks the sampler 2 into the water body to be detected, and controls the sinking depth by controlling the sampling rope 5. As the sinking depth of the sampler 2 increases, the water pressure increases, the floating block 31 moves upward, the rack 321 moves synchronously, the gear 322 rotates when the rack 321 and the gear 322 are engaged, the push rod 323 moves away from the moving groove 23, the baffle 211 is pushed away, the blocking plate 42 and the partition plate 261 also move, the filter hole 411 and the water storage cavity 22 are both in an open state, the water body enters the water storage cavity 22 through the sampling cavity 21 and the filter hole 411 in sequence, the detection probe 11 detects the water body in the water storage cavity 22 in real time, and the detection personnel obtains the detection data from the display screen 12.

[0054] When the rack 321 continues to move upward and is no longer engaged with the gear 322, the gear 322 rotates under the action of the reset spring 43, the push rod 323 moves toward the moving groove 23, the baffle 211 closes the sampler 2, the filter hole 411 and the water storage cavity 22 are in a closed state, and the airtightness of the water storage cavity 22 is ensured. Thus, the detection personnel can obtain the detection data of the water samples at multiple depths without multiple operations, and the water quality sampling and detecting efficiency is improved.

[0055] The application further discloses a use method of the online quick water quality sampling and detecting device.

[0056] S1, sinking the sampler 2 into the water body to be detected, so that the floating block 31 moves upward under the drive of the water pressure;

[0057] S2, when the floating block 31 moves to the same horizontal plane as the sampling cavity 21, the rack 321 moves synchronously with the floating block 31, drives the gear 322 to rotate, so that the push rod 323 moves away from the moving groove 23, opens the baffle 211 corresponding to the sampling cavity 21. At the same time, with the movement of the push rod 323, the fixed rope 44 pulls the sealing plate 42 into the avoiding groove 412, so that the filter hole 411 is in an open state, and the partition plate 261 also moves into the installation groove 26 with the movement of the push rod 323, so that the water storage cavity 22 is communicated with the sampling cavity 21, and the water body to be detected enters the water storage cavity 22 for detection;

[0058] S3, the floating block 321 continues to move upward, and when the rack 321 no longer meshes with the gear 322, the gear 322 rotates in the direction under the reset action of the coil spring 324, drives the push rod 323 to move close to the moving groove 23, so that the baffle 211 located below the floating block 31 is closed;

[0059] S4, taking out the sampler 2 from the water body, pulling out the rubber plug, and pouring the sampler 2 to pour out the collected water sample from the water storage cavity 22.

[0060] The sampler 2 is sunk into the water body to be detected, and with the sinking of the sampler 2, the floating block 31 moves upward under the drive of the water pressure, the floating block 31 moves to the same horizontal plane as the sampling cavity 21, the floating block 31 drives the baffle 211 to rotate through the pusher 32, at this time, the filter hole 411 and the water storage cavity 22 are in an open state, and the water body can enter the water storage cavity 22 through the sampling cavity 21 and the filter hole 411, and the detection probe 11 detects the water body. The floating block 31 continues to move upward, and the baffle 211 corresponding to the sampling cavity 21 located below the floating block 31 is closed, and correspondingly, the filter hole 411 and the water storage cavity 22 are also closed. After detection, the sampler 2 is taken out from the water body, the rubber plug is pulled out, and the water sample in the water storage cavity 22 is discharged.

[0061] The above are preferred embodiments of the application, and do not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape and principle of the application should be covered in the protection scope of the application.

Claims

1. An online rapid water quality sampling and detection device, characterized by: The invention comprises a detection device (1), a sampler (2) and an opening and closing assembly (3), wherein a plurality of sampling cavities (21) are provided on a side wall of the sampler (2) in a vertical direction, a water storage cavity (22) is provided below the sampling cavity (21), the water storage cavity (22) is communicated with the sampling cavity (21), a baffle (211) is hingedly connected to a side of the sampling cavity (21) away from the axis of the sampler (2), the baffle (211) corresponds to the sampling cavity (21) in a one-to-one manner, a movable groove (23) is provided at the bottom of the sampler (2) in a vertical direction, the opening and closing assembly (3) comprises a floating block (31) and a pushing member (32), the floating block (31) is sealingly slidably connected in the movable groove (23) and is driven by water pressure, and the floating block (31) drives the baffle (211) to rotate through the pushing member (32); The pushing member (32) includes a rack (321) that moves synchronously with the floating block (31), a gear (322) meshingly connected to the rack (321), and a pushing rod (323) threadedly connected to the gear (322); a receiving chamber (24) and a clearance chamber (25) for the rack (321) to slide are provided on a side of the sampling chamber (21) close to the axis of the sampler (2); the receiving chamber (24) is communicated with the clearance chamber (25); the gear (322) is rotatably connected to the receiving chamber (24); a sliding groove (2111) is provided on a side wall of the baffle (211) close to the receiving chamber (24); a slider (2112) is slidably connected to the sliding groove (2111); and an end of the pushing rod (323) away from the gear (322) is hinged to the slider (2112); A filter assembly (4) is provided in the sampling cavity (21), wherein the filter assembly (4) comprises a filter plate (41), and a plurality of filter holes (411) are provided on the filter plate (41); An avoidance groove (412) is provided on the inner wall of the filter hole (411), a blocking plate (42) is slidably connected in the avoidance groove (412), and a side wall of the blocking plate (42) close to the bottom of the avoidance groove (412) is fixedly connected to the push rod (323) via a fixing rope (44); An installation groove (26) is provided on the upper inner wall of the water storage chamber (22), a partition (261) is slidably connected in the installation groove (26), and the partition (261) is fixedly connected to the push rod (323) via a connecting rod (262).

2. The online rapid water quality sampling and detection device according to claim 1, characterized in that: A coil spring (324) is provided between the gear (322) and the side wall of the accommodating cavity (24); one end of the coil spring (324) is fixedly connected to the gear (322), and the other end is fixedly connected to the side wall of the accommodating cavity (24).

3. The online rapid water quality sampling and detection device according to claim 2, characterized in that: The rack (321) is made of magnetic material, and the floating block (31) is an electromagnet.

4. The online rapid water quality sampling and detection device according to claim 1, characterized in that: A return spring (43) is fixedly installed between the blocking plate (42) and the inner bottom wall of the avoidance groove (412).

5. The online rapid water quality sampling and detection device according to claim 1, characterized in that: Each of the sampling cavities (21) is provided with a plurality of them along the circumference of the axis of the sampler (2).

6. The online rapid water quality sampling and detection device according to claim 5, characterized in that: The detection device (1) comprises a plurality of detection probes (11) and a display screen (12). The detection probes (11) are fixedly installed in the water storage cavity (22) and correspond one-to-one with the water storage cavity (22). The plurality of detection probes (11) are electrically connected to the display screen (12).

7. A method for using an online rapid water quality sampling and detection device, characterized by: The online rapid water quality sampling and detection device according to any one of claims 1 to 6 comprises the following steps: S1, sinking the sampler (2) into the water body to be tested, so that the floating block (31) moves upward under the pressure of the water body; S2, when the floating block (31) and a certain sampling cavity (21) are at the same horizontal plane, the baffle (211) corresponding to the sampling cavity (21) is opened, and at the same time the filter hole (411) is in an open state, the water storage cavity (22) is connected to the sampling cavity (21), and the water to be tested enters the water storage cavity (22) for testing; S3, the floating block (31) continues to move upward, and the baffle (211) below the floating block (31) is closed; S4. Take out the sampler (2) from the water body and pour out the collected water sample from the water storage chamber (22).

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