Sampling device for water quality detection

Abstract

The invention belongs to the technical field of water quality sampling and discloses a sampling device for water quality detection, which comprises a bottom shell, a tank cover is movably mounted on the upper surface of the bottom shell, a clamping cover is clamped in the middle of the upper surface of the tank cover, a compressed air bag is fixedly connected to the lower surface of the clamping cover, and a plurality of pipe sleeves are slidably connected to the middle of the tank cover. A connecting rod is fixedly connected into the pipe sleeve, and a sealing gasket is fixedly connected to the lower end of the connecting rod. A rectangular plate makes contact with a limiting block, a one-way valve can be opened through water pressure, water of the target depth can quickly enter a through hole, a hose and a connector and finally enter a collecting pipe, a sealing gasket can be lifted upwards according to the volume of the water entering the collecting pipe till a protrusion of a pipe sleeve makes contact with the lower surface of a tank cover, and in the process, the water is sealed. The pipe sleeve protrudes upwards by a corresponding volume according to the volume of water entering the collecting pipe, so that the buoyancy is kept unchanged in the sampling process, and accurate sampling at a target depth is completed.

Description

Technical Field

[0001] The invention belongs to the technical field of water quality sampling, and in particular relates to a sampling device for water quality detection. Background Art

[0002] The scope of water quality testing is very wide, including unpolluted and polluted natural water (rivers, lakes, seas) and various industrial drainage. The main monitoring items can be divided into two categories: one is the comprehensive indicators reflecting the water quality, such as temperature, chromaticity, turbidity, pH value, conductivity, suspended solids, dissolved oxygen, chemical oxygen demand and biochemical oxygen demand; the other is some toxic substances, such as phenol, cyanide, arsenic, lead, chromium, cadmium, mercury and organic pesticides. Water sampling is an important part of water quality testing. Through the comprehensive analysis of water test results, it is more conducive to grasping and judging the real pollution of water bodies.

[0003] When the existing device is suspended at the target depth for precise sampling, the volume of the device, which is similar to a suction mechanism of a needle tube, changes during the process of sampling the water at the target depth, causing the buoyancy of the device to change, thereby causing the device to sink or float away from the target depth, ultimately reducing the accuracy of the sampling. Summary of the invention

[0004] The purpose of the present invention is to provide a sampling device for water quality detection to solve the problems raised in the above background technology.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sampling device for water quality detection, comprising a bottom shell, a tank cover is movably mounted on the upper surface of the bottom shell, a card cover is clamped in the middle of the upper surface of the tank cover, a compressed air bag is fixedly connected to the lower surface of the card cover, a plurality of pipe sleeves are slidably connected to the middle of the tank cover, a connecting rod is fixedly connected to the inside of the pipe sleeve, a sealing gasket is fixedly connected to the lower end of the connecting rod, a gas tank is fixedly mounted at the bottom center of the bottom shell, an exhaust valve is fixedly mounted on the upper end of the gas tank, a plurality of collecting pipes are arranged inside the bottom shell, a connecting sleeve is fixedly connected to the bottom of the collecting pipe, and the A return spring is fixedly connected to the inner top of the connecting sleeve, and a sliding pad is fixedly connected to the bottom end of the return spring. A connecting head is arranged directly below the connecting sleeve, and a hose is fixedly connected to the lower end of the connecting head. An installation cavity is opened below the hose, and an adjustment mechanism is arranged inside the installation cavity. A rectangular cavity is opened below the adjustment mechanism, and a sliding rod is fixedly connected to the inner side of the rectangular cavity. A rectangular plate is slidably connected to the outer end of the sliding rod, and a compression spring is fixedly connected between the rectangular plate and the inner wall of the rectangular cavity. A rotating mechanism is rotatably installed on the curved surface of the bottom shell, and a plurality of nozzles are fixedly installed on the curved surface of the bottom shell.

[0006] Preferably, the adjustment mechanism includes an adjustment plate, a through hole is opened in the middle of the adjustment plate, a one-way valve is fixedly installed at the bottom of the through hole, an adjustment rod is threadedly connected to one side of the adjustment plate, a fixed rod is slidably connected to the other side of the adjustment plate, a sealing plate is fixedly connected to the lower end of the adjustment plate, and a limiting block is fixedly connected to the lower surface of the sealing plate.

[0007] Preferably, the rotating mechanism comprises two rotating plates, a plurality of fan-shaped holes are opened in the middle of the rotating plates, and a plurality of electromagnets and a plurality of permanent magnets are fixedly connected to the edges of the rotating plates.

[0008] Preferably, the lower end of the compressed air bag is fixedly connected to the tank cover, the compressed air bag is annular, a protrusion is provided on the inner side of the pipe sleeve, a groove is provided on the lower surface of the sealing gasket, the sealing gasket is adapted to the collecting pipe, the sliding pad is slidably connected to the connecting sleeve, the connecting head is fixedly connected to the bottom shell, the rectangular plate is adapted to the rectangular cavity and has good sealing performance, the interior of the gas tank is filled with an appropriate amount of compressed gas, the nozzle is connected to the interior of the bottom shell, and the pipe sleeve is clamped with the collecting pipe.

[0009] Preferably, the upper end of the adjusting plate is connected to the hose, the adjusting plate is slidably connected to the mounting cavity, the adjusting rod is rotatably connected to the bottom shell, the fixing rod is fixedly connected to the bottom shell, the sealing plate is slidably connected to the bottom shell, the lower surface of the sealing plate is in contact with the rectangular plate, and the opening direction of the one-way valve is that the rectangular cavity points to the inside of the collecting tube.

[0010] Preferably, the two rotating plates are both rotatably connected to the bottom shell, the permanent magnet is located on one side of the electromagnet, and the two rotating plates are symmetrically arranged.

[0011] The beneficial effects of the present invention are as follows: 1. The rectangular plate of the present invention will contact the limit block, and the water pressure will open the one-way valve. The water at the target depth will quickly enter the through hole, the hose, the connector, and finally enter the interior of the collecting tube. The sealing gasket will be lifted upward according to the volume of water entering the collecting tube until the protrusion of the tube sleeve contacts the lower surface of the tank cover. During the process, the tube sleeve will protrude upward by a corresponding volume as the volume of water enters the interior of the collecting tube, thereby maintaining the buoyancy of the present invention unchanged during the sampling process, thereby completing accurate sampling of the target depth.

[0012] 2. The present invention drives the adjustment plate to move inward or outward by rotating the adjustment rod, so that the limit block moves with the adjustment plate, and the position of the through hole is adjusted. When the position of the through hole is adjusted to the position corresponding to the sampling depth, the movement is stopped. When multiple samplings at the same depth are performed, all the adjustment plates are adjusted to the same position, and when single sampling at different depths is performed, multiple adjustment plates are adjusted to corresponding positions of different depths required for sampling, thereby simply and conveniently completing multiple samplings at the same depth or single sampling at different depths.

[0013] 3. By placing the present invention in water, sampling is completed during the sinking process. After sampling is completed, the exhaust valve is opened, and the gas inside the gas tank is discharged, so that the gas pressure in the internal space of the bottom shell is slowly increased, which will cause the card cover to detach from the tank cover and bring out the compressed air bag. The gas discharged from the gas tank will enter the compressed air bag, thereby increasing the buoyancy of the present invention, achieving rapid buoyancy and finally floating to the surface. Not only is the operation simple when sampling water bodies, but the recovery is also more convenient without the need for an external power device.

[0014] 4. Before using the present invention, the collecting tube is clamped inside the tube sleeve, and then the tank cover is installed on the top of the bottom shell. During the process, when the sliding pad contacts the connecting head, it will be squeezed and moved upward, so that the inside of the collecting tube is connected with the inside of the connecting head. After floating to the water surface, the tank cover is opened to drive the tube sleeve and the sealing gasket to move upward. During the process, the water of the target depth remaining in the adjusting plate, the hose and the connecting head will be sucked out, thereby avoiding the water samples remaining in the hose and the connecting head from interfering with subsequent water sampling, further ensuring the accuracy of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the appearance structure of the present invention; Figure 2 A half-section schematic diagram of the bottom shell of the present invention; Figure 3 This is a half-section schematic diagram of a rectangular cavity of the present invention; Figure 4 For the present invention Figure 3 The enlarged schematic diagram at A in the middle; Figure 5 A half-section schematic diagram of the adjustment plate of the present invention; Figure 6 It is a schematic diagram of the structure of the rotating mechanism of the present invention.

[0016] In the figure: 1, bottom shell; 2, tank cover; 3, card cover; 4, compressed air bag; 5, pipe sleeve; 6, connecting rod; 7, sealing gasket; 8, gas tank; 9, exhaust valve; 10, collecting pipe; 11, connecting sleeve; 12, reset spring; 13, sliding pad; 14, connecting head; 15, hose; 16, installation cavity; 17, adjusting mechanism; 171, adjusting plate; 172, through hole; 173, one-way valve; 174, adjusting rod; 175, fixing rod; 176, sealing plate; 177, limit block; 18, rectangular cavity; 19, sliding rod; 20, rectangular plate; 21, compression spring; 22, rotating mechanism; 221, rotating plate; 222, fan-shaped hole; 223, electromagnet; 224, permanent magnet; 23, nozzle. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figures 1 to 6As shown, the embodiment of the present invention provides a sampling device for water quality detection, including a bottom shell 1, a tank cover 2 is movably installed on the upper surface of the bottom shell 1, a card cover 3 is clamped in the middle of the upper surface of the tank cover 2, a compressed air bag 4 is fixedly connected to the lower surface of the card cover 3, a plurality of pipe sleeves 5 are slidably connected to the middle of the tank cover 2, a connecting rod 6 is fixedly connected inside the pipe sleeve 5, a sealing gasket 7 is fixedly connected to the lower end of the connecting rod 6, a gas tank 8 is fixedly installed at the bottom center of the bottom shell 1, an exhaust valve 9 is fixedly installed on the upper end of the gas tank 8, a plurality of collecting pipes 10 are arranged inside the bottom shell 1, a connecting sleeve 11 is fixedly connected to the bottom of the collecting pipe 10, a reset spring 12 is fixedly connected to the top end of the connecting sleeve 11, a sliding pad 13 is fixedly connected to the bottom end of the reset spring 12, a connecting head 14 is arranged directly below the connecting sleeve 11, a hose 15 is fixedly connected to the lower end of the connecting head 14, an installation cavity 16 is opened below the hose 15, and the installation cavity 1 6 is provided with an adjusting mechanism 17, and a rectangular cavity 18 is provided below the adjusting mechanism 17. A slide rod 19 is fixedly connected to the inner side of the rectangular cavity 18, and a rectangular plate 20 is slidably connected to the outer end of the slide rod 19. A compression spring 21 is fixedly connected between the rectangular plate 20 and the inner wall of the rectangular cavity 18. A rotating mechanism 22 is rotatably installed on the curved surface of the bottom shell 1, and a plurality of nozzles 23 are fixedly installed on the curved surface of the bottom shell 1. The function of the nozzle 23 is to place the present invention in water and complete sampling during the sinking process. After the sampling is completed, the exhaust valve 9 is opened, and the gas inside the gas tank 8 is discharged, so that the gas pressure in the internal space of the bottom shell 1 is slowly increased, which will cause the card cover 3 to separate from the tank cover 2 and bring out the compressed air bag 4. The gas discharged from the gas tank 8 will enter the compressed air bag 4, thereby increasing the buoyancy of the present invention, achieving rapid floating, and finally floating to the surface of the water. Not only is the operation simple when sampling the water body, but the recovery is also more convenient, and no external power device is required.

[0019] The regulating mechanism 17 includes an regulating plate 171, a through hole 172 is provided in the middle of the regulating plate 171, a one-way valve 173 is fixedly installed at the bottom of the through hole 172, an regulating rod 174 is threadedly connected to one side of the regulating plate 171, a fixing rod 175 is slidably connected to the other side of the regulating plate 171, a sealing plate 176 is fixedly connected to the lower end of the regulating plate 171, and a limiting block 177 is fixedly connected to the lower surface of the sealing plate 176, which functions to contact the limiting block 177 through the rectangular plate 20, and the water pressure will By opening the one-way valve 173, water at the target depth will quickly enter the through hole 172, the hose 15, the connector 14, and finally enter the interior of the collecting tube 10. The sealing gasket 7 will be lifted upward according to the volume of water entering the collecting tube 10 until the protrusion of the tube sleeve 5 contacts the lower surface of the tank cover 2. During the process, the tube sleeve 5 will protrude upward by a corresponding volume as the volume of water enters the interior of the collecting tube 10, thereby maintaining the buoyancy of the present invention unchanged during the sampling process, thereby completing accurate sampling of the target depth.

[0020] Among them, the rotating mechanism 22 includes two rotating plates 221, a plurality of fan-shaped holes 222 are opened in the middle of the rotating plate 221, a plurality of electromagnets 223 and a plurality of permanent magnets 224 are fixedly connected to the edge of the rotating plate 221, the lower end of the compressed air bag 4 is fixedly connected to the tank cover 2, the compressed air bag 4 is annular, a protrusion is provided on the inner side of the pipe sleeve 5, a groove is opened on the lower surface of the sealing gasket 7, the sealing gasket 7 is adapted to the collecting pipe 10, the sliding pad 13 is slidably connected to the connecting sleeve 11, the connecting head 14 is fixedly connected to the bottom shell 1, the rectangular plate 20 is adapted to the rectangular cavity 18 and has good sealing performance, the interior of the gas tank 8 is filled with an appropriate amount of compressed gas, and the nozzle 23 is connected to the inner surface of the bottom shell 1. The pipe sleeve 5 and the collecting pipe 10 are connected, and the function is that before use, the collecting pipe 10 is clamped inside the pipe sleeve 5, and then the tank cover 2 is installed on the top of the bottom shell 1. During the process, when the sliding pad 13 contacts the connecting head 14, it will be squeezed and moved upward, so that the interior of the collecting pipe 10 is connected with the interior of the connecting head 14. After floating to the water surface, the tank cover 2 is opened to drive the pipe sleeve 5 and the sealing gasket 7 to move upward. During the process, the water of the target depth remaining in the adjusting plate 171, the hose 15, and the connecting head 14 will be sucked out, thereby avoiding the residual water sample in the hose 15 and the connecting head 14 interfering with the subsequent water sampling, and further ensuring the accuracy of the sampling.

[0021] Among them, the upper end of the adjustment plate 171 is connected to the hose 15, the adjustment plate 171 is slidably connected to the installation cavity 16, the adjustment rod 174 is rotatably connected to the bottom shell 1, the fixing rod 175 is fixedly connected to the bottom shell 1, the sealing plate 176 is slidably connected to the bottom shell 1, and the lower surface of the sealing plate 176 contacts the rectangular plate 20. The opening direction of the one-way valve 173 is that the rectangular cavity 18 points to the inside of the collection tube 10. The two rotating plates 221 are both rotatably connected to the bottom shell 1, the permanent magnet 224 is located on one side of the electromagnet 223, and the two rotating plates 221 are symmetrically arranged. Its function is to The adjusting rod 174 is rotated to drive the adjusting plate 171 to move inward or outward, so that the limit block 177 moves with the adjusting plate 171, and the position of the through hole 172 is adjusted. When the position of the through hole 172 is adjusted to the position corresponding to the sampling depth, the movement is stopped. When multiple samplings at the same depth are performed, all the adjusting plates 171 are adjusted to the same position. When single sampling at different depths is performed, multiple adjusting plates 171 are adjusted to the corresponding positions of the different depths required for sampling, so that multiple samplings at the same depth or single sampling at different depths can be completed simply and conveniently.

[0022] Working principle: Before the present invention is used, the collecting tube 10 is clamped inside the tube sleeve 5, and then the tank cover 2 is installed on the top of the bottom shell 1. During the process, when the sliding pad 13 contacts the connecting head 14, it will be squeezed and moved upward, so that the inside of the collecting tube 10 is connected with the inside of the connecting head 14, and the fan-shaped holes 222 on the two rotating plates 221 overlap. At this time, the electromagnets 223 on the upper and lower sides contact each other, the sealing pad 7 contacts the bottom of the collecting tube 10, the exhaust valve 9 is opened, and the gas tank 8 replenishes a proper amount of gas into the inside of the bottom shell 1, but the clamping cover 3 will not be separated from the tank cover 2, and then the exhaust valve 9 is closed; Before using the present invention, the adjusting rod 174 is rotated to drive the adjusting plate 171 to move inward or outward, so that the limit block 177 moves with the adjusting plate 171, and the position of the through hole 172 inside the adjusting plate 171 is adjusted. When the adjusting plate 171 is adjusted to the position corresponding to the sampling depth, it stops moving. When multiple samplings are performed at the same depth, all the adjusting plates 171 are adjusted to the same position. When single sampling at different depths is performed, multiple adjusting plates 171 are adjusted to the corresponding positions of the different depths required for sampling. Then the present invention is placed in water, and it will slowly sink to the bottom of the water. There is a direct linear relationship between water depth and water pressure, that is, as the depth increases, the water pressure also increases, and the water pressure will push the rectangular plate 20 to move inward along the slide bar 19 and squeeze the compression spring 21. During the process, water will enter the inside of the rectangular cavity 18 outside the rectangular plate 20. The greater the water pressure, the greater the pressure of squeezing the compression spring 21. According to Hooke's law, the deformation of the elastic material is proportional to the applied force within a certain range, that is, within the working range of the compression spring 21, there is a linear relationship between the compression amount and the applied force; When the sampling depth is about to be reached, the upper and lower electromagnets 223 are energized, and a repulsive force is generated between the two electromagnets 223 to repel each other. At the same time, the lower electromagnet 223 will attract the upper permanent magnet 224, and the upper electromagnet 223 will attract the lower permanent magnet 224, thereby driving the two rotating plates 221 to be misaligned, so that the upper and lower fan-shaped holes 222 no longer overlap, thereby increasing the resistance of the device to sink. At the same time, the gas inside the bottom shell 1 is ejected downward from the nozzle 23, so that the sinking speed of the present invention becomes slow until the present invention is in a suspended state at the target depth. During the process, the exhaust valve 9 will open to continuously replenish gas to the inside of the bottom shell 1; After reaching the sampling depth, the rectangular plate 20 will contact the limit block 177. At this time, the water pressure will open the one-way valve 173, and the water at the target depth will quickly enter the through hole 172, the hose 15, the connector 14, and finally enter the interior of the collecting tube 10. The sealing gasket 7 will be lifted upward according to the volume of water entering the collecting tube 10 until the protrusion of the tube sleeve 5 contacts the lower surface of the tank cover 2. During the process, the tube sleeve 5 will protrude upward by a corresponding volume according to the volume of water entering the collecting tube 10, thereby maintaining the buoyancy of the present invention unchanged during the sampling process, thereby completing accurate sampling of the target depth; After the target depth sampling is completed, the upper and lower electromagnets 223 are reversely energized, and a repulsive force is generated between the two to attract the other electromagnet 223. At the same time, the lower electromagnet 223 repels the upper permanent magnet 224, and the upper electromagnet 223 repels the lower permanent magnet 224, thereby driving the two rotating plates 221 to completely overlap, and the nozzle 23 stops spraying downwards, reducing the resistance of the present invention when sinking. The present invention will continue to sink and repeat the above steps when reaching the next sampling depth; When the deepest sampling is completed or the device reaches the bottom of the water, the exhaust valve 9 is opened, and the gas inside the gas tank 8 is discharged, so that the gas pressure in the internal space of the bottom shell 1 slowly increases, which will cause the card cover 3 to separate from the tank cover 2 and bring out the compressed air bag 4. The gas discharged from the gas tank 8 will enter the compressed air bag 4, thereby increasing the buoyancy of the device, achieving rapid buoyancy, and finally floating to the surface, opening the tank cover 2, driving the pipe sleeve 5 and the sealing gasket 7 to move upward. During the process, the water of the target depth remaining in the adjusting plate 171, the hose 15, and the connecting head 14 will be sucked out, and then the collecting tube 10 will be driven to move upward and be taken out, and then the pipe sleeve 5 and the collecting tube 10 will be separated to complete the sampling.

[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sampling device for water quality detection, comprising a bottom shell (1), a tank cover (2) being movably mounted on the upper surface of the bottom shell (1), characterized in that: A card cover (3) is snapped onto the middle of the upper surface of the tank cover (2), a compressed air bag (4) is fixedly connected to the lower surface of the card cover (3), a plurality of pipe sleeves (5) are slidably connected to the middle of the tank cover (2), a connecting rod (6) is fixedly connected to the inside of the pipe sleeve (5), a sealing gasket (7) is fixedly connected to the lower end of the connecting rod (6), a gas tank (8) is fixedly mounted at the bottom center of the bottom shell (1), an exhaust valve (9) is fixedly mounted to the upper end of the gas tank (8), a plurality of collecting pipes (10) are arranged inside the bottom shell (1), a connecting sleeve (11) is fixedly connected to the bottom of the collecting pipe (10), a return spring (12) is fixedly connected to the top end of the connecting sleeve (11), and a sliding pad is fixedly connected to the bottom end of the return spring (12). (13), a connecting head (14) is arranged directly below the connecting sleeve (11), a hose (15) is fixedly connected to the lower end of the connecting head (14), a mounting cavity (16) is provided below the hose (15), an adjusting mechanism (17) is provided inside the mounting cavity (16), a rectangular cavity (18) is provided below the adjusting mechanism (17), a sliding rod (19) is fixedly connected to the inner side of the rectangular cavity (18), a rectangular plate (20) is slidably connected to the outer end of the sliding rod (19), a compression spring (21) is fixedly connected between the rectangular plate (20) and the inner wall of the rectangular cavity (18), a rotating mechanism (22) is rotatably mounted on the curved surface of the bottom shell (1), and a plurality of nozzles (23) are fixedly mounted on the curved surface of the bottom shell (1).

2. A water quality testing sampling device according to claim 1, characterized in that: The regulating mechanism (17) comprises an regulating plate (171), a through hole (172) is provided in the middle of the regulating plate (171), a one-way valve (173) is fixedly installed at the bottom of the through hole (172), an regulating rod (174) is threadedly connected to one side of the regulating plate (171), a fixing rod (175) is slidably connected to the other side of the regulating plate (171), a sealing plate (176) is fixedly connected to the lower end of the regulating plate (171), and a limiting block (177) is fixedly connected to the lower surface of the sealing plate (176).

3. A water quality testing sampling device according to claim 2, characterized in that: The rotating mechanism (22) comprises two rotating plates (221), a plurality of fan-shaped holes (222) are provided in the middle of the rotating plates (221), and a plurality of electromagnets (223) and a plurality of permanent magnets (224) are fixedly connected to the edges of the rotating plates (221).

4. A water quality testing sampling device according to claim 3, characterized in that: The lower end of the compressed air bag (4) is fixedly connected to the tank cover (2), the compressed air bag (4) is annular, the inner side of the pipe sleeve (5) is provided with a protrusion, the lower surface of the sealing gasket (7) is provided with a groove, the sealing gasket (7) is adapted to the collecting pipe (10), the sliding pad (13) is slidably connected to the connecting sleeve (11), the connecting head (14) is fixedly connected to the bottom shell (1), the rectangular plate (20) is adapted to the rectangular cavity (18) and has good sealing performance, the interior of the gas tank (8) is filled with an appropriate amount of compressed gas, the nozzle (23) is communicated with the interior of the bottom shell (1), and the pipe sleeve (5) is clamped with the collecting pipe (10).

5. A water quality testing sampling device according to claim 4, characterized in that: The upper end of the adjustment plate (171) is in communication with the hose (15), the adjustment plate (171) is slidably connected to the mounting cavity (16), the adjustment rod (174) is rotatably connected to the bottom shell (1), the fixing rod (175) is fixedly connected to the bottom shell (1), the sealing plate (176) is slidably connected to the bottom shell (1), the lower surface of the sealing plate (176) is in contact with the rectangular plate (20), and the opening direction of the one-way valve (173) is from the rectangular cavity (18) to the inside of the collecting tube (10).

6. A water quality testing sampling device according to claim 5, characterized in that: The two rotating plates (221) are both rotatably connected to the bottom shell (1); the permanent magnet (224) is located on one side of the electromagnet (223); and the two rotating plates (221) are symmetrically arranged.

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