Water quality multi-depth sampling device for environmental monitoring

Abstract

The invention discloses a water quality multi-depth sampling device for environmental monitoring, and belongs to the field of water quality sampling. A water quality multi-depth sampling device for environmental monitoring comprises a buoyancy ring, the inner wall of the buoyancy ring is fixedly connected with a bearing plate, the bottom of the bearing plate is fixedly connected with a sampling cylinder, the water quality multi-depth sampling device further comprises multiple sets of sampling rings, the sampling rings are rotatably connected to the sampling cylinder, and the sampling rings are arranged at equal intervals. The two sides of each group of sampling rings are fixed and communicated with sampling pipes, and the interior of the sampling cylinder is divided into a plurality of groups of sampling bins by sealing plates; the piston plate slides in the piston bin in a reciprocating manner, so that water samples at different depths are synchronously extracted and collected, and the sampling efficiency is improved; and the arrangement of a linkage gear and a linkage fluted disc is matched, so that the sampling pipe rotates around the sampling cylinder, water samples in different areas at the same height are collected, the sampling effect is improved, and the accuracy of a detection result is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of water quality sampling, and particularly relates to a multi-depth water quality sampling device for environmental monitoring. Background Art

[0002] Environmental monitoring refers to the activities of environmental monitoring agencies to monitor and measure the environmental quality status. By monitoring and measuring the indicators reflecting the environmental quality, the environmental pollution status and the level of environmental quality are determined. Water quality monitoring is a kind of environmental detection, which is the process of monitoring and measuring the types of pollutants in water bodies, the concentrations of various pollutants and their changing trends, and evaluating the water quality status. The monitoring scope is very wide, including the monitoring of water quality biological pollution.

[0003] When conducting water quality biological pollution monitoring, a sampling device is needed to sample the river water. After sampling, the water quality biological content in the river water is detected by a testing agency to judge the water quality biological pollution situation in the river water.

[0004] At present, during the sampling process of the existing sampling device, it is impossible to collect samples at multiple depths at one time, and the extraction direction of the samples at each depth is relatively single, and it is impossible to achieve a comprehensive collection of water samples at the same height, resulting in a reduction in the accuracy of the final detection result. Therefore, a multi-depth water quality sampling device for environmental monitoring is proposed. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems in the prior art that it is impossible to collect samples at multiple depths at one time, and the extraction direction of the samples at each depth is relatively single, and it is impossible to achieve a comprehensive collection of water samples at the same height, resulting in a reduction in the accuracy of the final detection result, and to propose a multi-depth water quality sampling device for environmental monitoring.

[0006] In order to achieve the above purpose, the present invention adopts the following technical scheme: A multi-depth water quality sampling device for environmental monitoring includes a buoyancy ring. A bearing plate is fixedly connected to the inner wall of the buoyancy ring. A sampling cylinder is fixedly connected to the bottom of the bearing plate. It further includes: sampling rings, the sampling rings are all rotatably connected to the sampling cylinder, multiple groups of the sampling rings are arranged at equal intervals, and sampling tubes are fixedly connected and communicated on both sides of each group of sampling rings. Among them, the sampling cylinder is divided into multiple groups of sampling chambers by a sealing plate, each group of sampling rings is communicated with the inner cavity of the sampling chamber at its corresponding position, and a sampling part for pumping water flow into the sampling chamber is arranged in the bearing plate; a backwashing component, the backwashing component is arranged on the sampling ring, and the backwashing component is used for backwashing and preventing blockage of the input end of the sampling tube.

[0007] For the convenience of multi-depth sampling, preferably, the sampling part includes a liquid extraction pipe fixedly connected inside the sampling cylinder. Liquid extraction holes are formed in the outer wall of the liquid extraction pipe located at the top of each group of sampling bins. A piston chamber is fixedly connected to the top of the bearing plate. The top end of the liquid extraction pipe is communicated with the piston chamber through an air suction pipe, and a one-way valve is arranged in the air suction pipe. A liquid extraction part for continuously generating suction force in the liquid extraction pipe is arranged on the bearing plate.

[0008] Furthermore, the liquid extraction part includes a piston plate slidably connected inside the piston chamber. A linkage shaft is rotatably connected to the top of the bearing plate. A driven gear is fixedly connected to the top end of the linkage shaft. A push-pull rod is hinged to the side wall of the piston plate, and the other end of the push-pull rod is rotatably connected to the top of the driven gear. A driving motor is fixedly connected to the top of the bearing plate, and a driving gear is fixedly connected to the output shaft of the driving motor. The driving gear is meshed with the driven gear.

[0009] To avoid the mixing of water samples at different depths, preferably, a buoyancy plate is slidably connected inside each group of sampling bins. A plurality of groups of diversion holes are equidistantly formed in the buoyancy plate, and the buoyancy plate is sleeved on the liquid extraction pipe and slides up and down along it. A sealing ring is fixedly connected to the top of each group of sampling bins, and the sealing ring is vertically aligned with the diversion holes.

[0010] To improve the sampling effect, preferably, a series rod is fixedly connected between multiple groups of sampling rings, and two groups of series rods are symmetrically arranged along the center of the sampling rings. The top ends of the two groups of series rods are fixed with a linkage gear disk. The bottom end of the linkage shaft penetrates below the bearing plate and is fixedly connected with a linkage gear. The linkage gear is meshed with the linkage gear disk.

[0011] To avoid blockage of the sampling pipe, preferably, the backflush assembly includes an annular pipe fixed between two groups of series rods and communicated with the inner cavity of the series rods. The number of annular pipes arranged is the same as that of the sampling rings, and each group of annular pipes is located above the sampling rings. Two backflush pipes are fixedly connected and communicated on both sides of the annular pipe, and the output end of the backflush pipe faces the input end of the sampling pipe. A gas guiding part for filling air into the annular pipe is arranged at the top of the series rod.

[0012] Furthermore, the gas guiding part includes a sealing ring rotatably connected to the top of the linkage gear disk, fixedly connected between the sealing ring and the side wall of the sampling cylinder, and communicated with the inner cavity of the series rod. An exhaust pipe is fixedly connected and communicated to the top of the sealing ring, and the other end of the exhaust pipe is communicated with the inner cavity of the piston chamber, and a one-way valve is arranged in the exhaust pipe.

[0013] To avoid clogging the sampling tube, preferably, the input end of the sampling tube is inclined downward, the input end of the sampling tube is fixedly connected with a filter cover, and a one-way valve is arranged in the sampling tube.

[0014] To facilitate the extraction of water samples, preferably, a water intake pipe is fixedly connected and communicated with the bottom of the inner cavity of each sampling bin, and an opening and closing valve is arranged on the water intake pipe.

[0015] To improve the sampling stability, preferably, a balance ball is fixedly connected to the bottom of the buoyancy ring, and multiple groups of balance balls are annularly and equidistantly distributed along the center of the buoyancy ring.

[0016] Compared with the prior art, the present invention provides a water quality multi-depth sampling device for environmental monitoring, having the following beneficial effects: 1. For this water quality multi-depth sampling device for environmental monitoring, by the reciprocating sliding of the piston plate in the piston chamber, the extraction and collection of water samples at different depths are synchronously realized, improving the sampling efficiency; and with the setting of the linkage gear and the linkage gear disc, the sampling tube rotates around the sampling cylinder, thereby collecting water samples in different areas at the same height, improving the sampling effect and ensuring the accuracy of the detection result.

[0017] 2. For this water quality multi-depth sampling device for environmental monitoring, under the thrust action generated by the reciprocating sliding of the piston plate in the piston chamber, gas is continuously blown along the backflush pipe towards the input end of the sampling tube, and with the rotation of the sampling tube, effectively avoiding sediments and impurities inside the water flow from clogging at the input end of the sampling tube, ensuring the guiding function of the sampling tube, making the water sample flow smoothly, and improving the sampling efficiency.

[0018] 3. For this water quality multi-depth sampling device for environmental monitoring, through the setting of the buoyancy plate, the diversion hole and the sealing ring, after the water sample enters the sampling bin, using its buoyancy effect, after the sampling bin is filled with water, the diversion hole and the liquid extraction hole are blocked, realizing the sealed isolation of each group of sampling bins, avoiding the mixing of water samples in each group, and ensuring the final detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the schematic diagram of the overall front view structure of a water quality multi-depth sampling device for environmental monitoring proposed by the present invention Figure 1 ; Figure 2 is the schematic diagram of the overall front view structure of a water quality multi-depth sampling device for environmental monitoring proposed by the present invention Figure 2 ; Figure 3 is the schematic diagram of the internal structure of the protective cover of a water quality multi-depth sampling device for environmental monitoring proposed by the present invention; Figure 4Schematic side sectional view of a multi-depth water quality sampling device for environmental monitoring proposed by the present invention; Figure 5 A multi-depth water quality sampling device for environmental monitoring proposed by the present invention Figure 4 Schematic enlarged view of area A therein; Figure 6 A multi-depth water quality sampling device for environmental monitoring proposed by the present invention Figure 4 Schematic view of area B therein; Figure 7 Schematic partial sectional view of sampling of a multi-depth water quality sampling device for environmental monitoring proposed by the present invention.

[0020] In the figure: 1. Buoyancy ring; 2. Bearing plate; 21. Protective cover; 3. Sampling cylinder; 31. Sealing plate; 32. Sampling chamber; 321. Water intake pipe; 4. Sampling ring; 41. Sampling pipe; 411. Filter cover; 5. Liquid extraction pipe; 51. Liquid extraction hole; 52. Piston chamber; 53. Air intake pipe; 54. Piston plate; 541. Push-pull rod; 55. Linkage shaft; 551. Driven gear; 56. Driving motor; 561. Driving gear; 6. Buoyancy plate; 61. Diversion hole; 62. Plugging ring; 63. Limiting ring; 7. Series rod; 71. Linkage gear disk; 72. Linkage gear; 8. Annular pipe; 81. Backwash pipe; 82. Sealing ring; 83. Exhaust pipe; 9. Balance ball. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0023] Embodiment: Refer to Figures 1-7, an environmental monitoring water quality multi-depth sampling device, including a buoyancy ring 1. A bearing plate 2 is fixedly connected to the inner wall of the buoyancy ring 1. A sampling cylinder 3 is fixedly connected to the bottom of the bearing plate 2. It further includes: a sampling ring 4, the sampling rings 4 are all rotatably connected to the sampling cylinder 3. Multiple groups of sampling rings 4 are arranged at equal intervals. And both sides of each group of sampling rings 4 are fixedly connected and communicated with a sampling pipe 41. The input end of the sampling pipe 41 is inclined downward. A filter cover 411 is fixedly connected to the input end of the sampling pipe 41. And a one-way valve is arranged in the sampling pipe 41. Among them, the sampling cylinder 3 is divided into multiple groups of sampling chambers 32 by a sealing plate 31. Each group of sampling rings 4 is communicated with the inner cavity of the sampling chamber 32 at its corresponding position. And a sampling part for pumping water flow into the sampling chamber 32 is arranged in the bearing plate 2; a backwashing component, the backwashing component is arranged on the sampling ring 4. The backwashing component is used for backwashing and anti-blocking the input end of the sampling pipe 41.

[0024] Refer to Figures 3-5 , among which, the sampling part includes a liquid extraction pipe 5. The liquid extraction pipe 5 is fixedly connected in the sampling cylinder 3. Liquid extraction holes 51 are opened on the outer wall of the liquid extraction pipe 5 at the top of each group of sampling chambers 32. A piston chamber 52 is fixedly connected to the top of the bearing plate 2. The top end of the liquid extraction pipe 5 is communicated with the piston chamber 52 through an air suction pipe 53. And a one-way valve is arranged in the air suction pipe 53. A liquid extraction part for continuously generating suction force in the liquid extraction pipe 5 is arranged on the bearing plate 2; the liquid extraction part includes a piston plate 54. The piston plate 54 is slidably connected in the piston chamber 52. A linkage shaft 55 is rotatably connected to the top of the bearing plate 2. A driven gear 551 is fixedly connected to the top end of the linkage shaft 55. A push-pull rod 541 is hinged to the side wall of the piston plate 54. The other end of the push-pull rod 541 is rotatably connected to the top of the driven gear 551. A driving motor 56 is fixedly connected to the top of the bearing plate 2. A driving gear 561 is fixedly connected to the output shaft of the driving motor 56. The driving gear 561 is meshed with the driven gear 551. In addition, a protective cover 21 is fixedly connected to the top of the bearing plate 2. The structures installed on the top of the bearing plate 2 are all wrapped in the protective cover 21.

[0025] It should be noted that the one-way valve in the air suction pipe 53 can only suck the gas in the liquid extraction pipe 5 into the piston chamber 52; the one-way valve in the sampling pipe 41 can only make the water flow into the sampling chamber 32 along the sampling pipe 41; in addition, the filter cover 411 adopts a grille plate style design. In this way, it will not filter the impurity particles in the water sample, ensuring the accuracy of the water sample detection result. At the same time, it can intercept larger impurities (mainly floating objects: such as dead branches and leaves, plastic bags, etc.) in the water flow, avoiding blocking the sampling pipe 41 and ensuring the sampling effect.

[0026] With the above structure set, the driving motor 56 is turned on. Through the meshing relationship between the driving gear 561 and the driven gear 551, the linkage shaft 55 is driven to rotate. At the same time, with the arrangement of the push-pull rod 541, the piston plate 54 is driven to slide back and forth in the piston chamber 52. When the piston plate 54 moves towards the side close to the linkage shaft 55, a suction force is generated in the piston chamber 52, and the one-way valve in the suction pipe 53 is opened, so that the suction force is transmitted to the liquid extraction pipe 5, thereby opening the one-way valves in each sampling pipe 41, and the water samples at different depths enter the corresponding sampling chambers 32 along the sampling pipes 41 at different heights, thus realizing the collection of water samples at different depths and effectively improving the sampling efficiency.

[0027] Refer to Figure 4 、 Figure 5 and Figure 7 , wherein, a buoyancy plate 6 is slidably connected in each sampling chamber 32. A plurality of groups of diversion holes 61 are equidistantly arranged on the buoyancy plate 6, and the buoyancy plate 6 is sleeved on the liquid extraction pipe 5 and slides up and down along it. A sealing ring 62 is fixedly connected to the top of each sampling chamber 32. The sealing ring 62 is aligned with the diversion holes 61 up and down, and a limiting ring 63 is fixedly connected to the liquid extraction pipe 5 located in each sampling chamber 32.

[0028] With the above structure set, as the water samples continuously enter the sampling chamber 32, under the buoyancy force, the buoyancy plate 6 will be pushed to float. Finally, the buoyancy plate 6 will fit with the sealing ring 62. At this time, the sealing ring 62 will block the diversion holes 61, and the buoyancy plate 6 will also block the liquid extraction holes 51, thereby blocking each sampling chamber 32 to prevent the water samples from mixing with each other and ensuring the final detection accuracy.

[0029] In addition, the setting of the limiting ring 63 can ensure that a liquid storage cavity is left at the bottom of each sampling chamber 32 in the initial state, so that the buoyancy plate 6 can be lifted after the water sample enters, ensuring the realization of the above-mentioned blocking and isolation function.

[0030] Refer to Figure 4 、 Figure 6 , wherein, a series connection rod 7 is fixedly connected between the multiple groups of sampling rings 4, and two groups of series connection rods 7 are symmetrically arranged along the center of the sampling rings 4. The top ends of the two groups of series connection rods 7 are fixed with a linkage gear disk 71, and the bottom end of the linkage shaft 55 penetrates below the bearing plate 2 and is fixedly connected with a linkage gear 72. The linkage gear 72 is meshed with the linkage gear disk 71.

[0031] With the above structure, during the rotation of the linkage shaft 55, due to the meshing effect between the linkage gear 72 and the linkage disk 71, the linkage gear 72 will drive the series rod 7 and multiple groups of sampling rings 4 to rotate around the sampling cylinder 3. In this way, during the sampling process, the sampling pipe 41 will rotate, so as to collect water samples in different areas at the same height, improving the sampling effect and ensuring the accuracy of the detection results.

[0032] Refer to Figures 3-7 , wherein, the backflush assembly includes an annular pipe 8. The annular pipe 8 is fixed between two groups of series rods 7, and the annular pipe 8 is communicated with the inner cavity of the series rod 7. The number of the annular pipes 8 provided is the same as that of the sampling rings 4, and each group of annular pipes 8 is located above the sampling ring 4. Both sides of the annular pipe 8 are fixedly connected and communicated with a backflush pipe 81. The output end of the backflush pipe 81 faces the input end of the sampling pipe 41. A gas guiding part for filling air into the annular pipe 8 is arranged at the top of the series rod 7; the gas guiding part includes a sealing ring 82. The sealing ring 82 is rotatably connected to the top of the linkage disk 71. The sealing ring 82 is fixedly connected to the side wall of the sampling cylinder 3 and is communicated with the inner cavity of the series rod 7. A discharge pipe 83 is fixedly connected and communicated with the top of the sealing ring 82. The other end of the discharge pipe 83 is communicated with the inner cavity of the piston chamber 52, and a one-way valve is arranged in the discharge pipe 83.

[0033] It should be noted that the one-way valve in the discharge pipe 83 only allows the gas in the piston chamber 52 to be discharged along the discharge pipe 83.

[0034] With the above structure, when the piston plate 54 moves to the side away from the linkage shaft 55, the gas in the piston chamber 52 will be compressed, and the one-way valve in the discharge pipe 83 will be opened, so that this part of the gas will enter each group of annular pipes 8 along the discharge pipe 83, the sealing ring 82 and the inner cavity of the series rod 7, and finally be blown towards the input end of the sampling pipe 41 by the backflush pipe 81, so as to generate a backflush effect at the input end of the sampling pipe 41 and cooperate with the rotation of the sampling pipe 41 to effectively prevent sediments and impurities in the water flow from blocking at the input end of the sampling pipe 41, ensuring the guiding function of the sampling pipe 41, making the water sample flow smoothly, and improving the sampling efficiency.

[0035] Refer to Figure 1 、 Figure 2 , wherein, a water intake pipe 321 is fixedly connected and communicated with the bottom of the inner cavity of each group of sampling chambers 32, and a switching valve is arranged on the water intake pipe 321; after the sampling is completed, the whole sampling cylinder 3 is taken out of the water flow, and then the switching valves on each group of water intake pipes 321 are opened in sequence from top to bottom to take out the water samples at different depths, thereby completing the entire multi-depth sampling work and effectively improving the convenience of sampling.

[0036] Refer to Figures 1-3, wherein, a balance ball 9 is fixedly connected to the bottom of the buoyancy ring 1, and multiple groups of balance balls 9 are evenly distributed along the center of the buoyancy ring 1 at equal intervals; by using multiple groups of evenly spaced balance balls 9, the weight is evenly distributed at the bottom of the buoyancy ring 1, which can make the whole device more stable, reduce the risk of tilting or overturning caused by external factors (such as water flow, wind and waves), and improve the overall stability of the device.

[0037] Referring to Figures 1-7 , in the present invention, when in use, the buoyancy ring 1 is placed into the water area to be sampled, and then the drive motor 56 is started. Through the meshing relationship between the drive gear 561 and the driven gear 551, the linkage shaft 55 is driven to rotate. At the same time, with the arrangement of the push-pull rod 541, the piston plate 54 is driven to reciprocate in the piston chamber 52. When the piston plate 54 moves towards the side close to the linkage shaft 55, a suction force is generated in the piston chamber 52, and the one-way valve in the suction pipe 53 is opened, so that the suction force is transmitted to the liquid extraction pipe 5, thereby opening the one-way valves in each sampling pipe 41, and the water samples at different depths enter the corresponding sampling chambers 32 along the sampling pipes 41 at different heights, so as to realize the collection of water samples at different depths. And as the water samples continuously enter the sampling chamber 32, under the buoyancy force, the buoyancy plate 6 will be pushed to float, and finally the buoyancy plate 6 will fit with the sealing ring 62. At this time, the sealing ring 62 will block the diversion hole 61, and the buoyancy plate 6 will also block the liquid extraction hole 51, so as to block each sampling chamber 32, prevent the water samples from mixing with each other, and ensure the final detection accuracy.

[0038] In addition, during the rotation of the linkage shaft 55, due to the meshing action between the linkage gear 72 and the linkage gear disk 71, the linkage gear 72 will drive the series rod 7 and multiple groups of sampling rings 4 to rotate around the sampling cylinder 3, so that during the sampling process, the sampling pipes 41 rotate, so as to collect water samples in different areas at the same height, improve the sampling effect, and ensure the accuracy of the detection results; when the piston plate 54 moves towards the side away from the linkage shaft 55, the gas in the piston chamber 52 will be compressed, and the one-way valve in the exhaust pipe 83 will be opened, so that this part of the gas enters each annular pipe 8 along the exhaust pipe 83, the sealing ring 82 and the inner cavity of the series rod 7, and finally blows towards the input end of the sampling pipe 41 through the backflush pipe 81, so as to generate a backflush action at the input end of the sampling pipe 41, and cooperate with the rotation of the sampling pipe 41 to effectively prevent sediments and impurities in the water flow from blocking at the input end of the sampling pipe 41, ensure the diversion function of the sampling pipe 41, make the water sample flow smoothly, and improve the sampling efficiency.

[0039] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A multi-depth sampling device for water quality for environmental monitoring, comprising a buoyancy ring (1), characterized in that: The inner wall of the buoyancy ring (1) is fixedly connected to a bearing plate (2), the bottom of the bearing plate (2) is fixedly connected to a sampling tube (3), and further comprises: Sampling rings (4), each of which is rotatably connected to the sampling tube (3), a plurality of groups of the sampling rings (4) are arranged at equal intervals, and both sides of each group of the sampling rings (4) are fixed and connected to a sampling tube (41), The sampling tube (3) is divided into a plurality of groups of sampling chambers (32) by a sealing plate (31), each group of sampling rings (4) is connected to the inner cavity of the sampling chamber (32) at a corresponding position thereof, and a sampling portion for drawing water into the sampling chamber (32) is provided in the carrier plate (2); A recoil component, wherein the recoil component is arranged on the sampling ring (4), and is used to perform recoil prevention on the input end of the sampling tube (41).

2. A multi-depth sampling device for water quality for environmental monitoring according to claim 1, characterized in that: The sampling portion comprises a liquid extraction tube (5), the liquid extraction tube (5) being fixedly connected in the sampling cylinder (3), and a liquid extraction hole (51) being provided on the outer wall of the liquid extraction tube (5) located at the top of each group of sampling chambers (32), and a piston chamber (52) being fixedly connected to the top of the supporting plate (2), and the top end of the liquid extraction tube (5) and the piston chamber (52) being connected via an air suction tube (53), and a one-way valve being provided in the air suction tube (53), and a liquid extraction portion for continuously generating suction in the liquid extraction tube (5) being provided on the supporting plate (2).

3. A multi-depth sampling device for water quality for environmental monitoring according to claim 2, characterized in that: The liquid pumping section comprises a piston plate (54), wherein the piston plate (54) is slidably connected in the piston chamber (52); the top of the supporting plate (2) is rotatably connected to a linkage shaft (55); the top of the linkage shaft (55) is fixedly connected to a driven gear (551); a push-pull rod (541) is hingedly connected to the side wall of the piston plate (54); the other end of the push-pull rod (541) is rotatably connected to the top of the driven gear (551); the top of the supporting plate (2) is fixedly connected to a driving motor (56); the output shaft of the driving motor (56) is fixedly connected to a driving gear (561); and the driving gear (561) is meshingly connected to the driven gear (551).

4. A multi-depth sampling device for water quality for environmental monitoring according to claim 1, characterized in that: A buoyancy plate (6) is slidably connected inside each group of the sampling chambers (32), a plurality of groups of guide holes (61) are provided on the buoyancy plate (6) at equal intervals, and the buoyancy plate (6) is sleeved on the liquid extraction tube (5) and slides up and down along the same, and a sealing ring (62) is fixedly connected to the top of each group of the sampling chambers (32), and the sealing ring (62) is aligned up and down with the guide holes (61).

5. A multi-depth sampling device for water quality for environmental monitoring according to claim 3, characterized in that: A series of rods (7) are fixedly connected between the plurality of groups of sampling rings (4), and two groups of the series of rods (7) are symmetrically arranged along the center of the sampling ring (4). A linkage toothed disc (71) is fixedly provided at the top of the two groups of series of rods (7). The bottom end of the linkage shaft (55) passes through the bottom of the carrier plate (2) and is fixedly connected to a linkage gear (72). The linkage gear (72) is meshingly connected to the linkage toothed disc (71).

6. A multi-depth sampling device for water quality for environmental monitoring according to claim 5, characterized in that: The recoil assembly comprises an annular tube (8), the annular tube (8) being fixed between two groups of serial rods (7), and the annular tube (8) being connected to the inner cavity of the serial rods (7), the number of the annular tubes (8) being the same as the sampling ring (4), and each group of the annular tubes (8) being located above the sampling ring (4), both sides of the annular tubes (8) being fixed and connected to recoil tubes (81), the output end of the recoil tube (81) being directly opposite to the input end of the sampling tube (41), and the top of the serial rods (7) being provided with an air guide portion for filling air into the annular tube (8).

7. A multi-depth sampling device for water quality for environmental monitoring according to claim 6, characterized in that: The air guide portion comprises a sealing ring (82), the sealing ring (82) being rotatably connected to the top of the linkage toothed disc (71), the sealing ring (82) being fixedly connected to the side wall of the sampling tube (3), and the sealing ring (82) being connected to the inner cavity of the series rod (7), the top of the sealing ring (82) being fixed and connected to an exhaust pipe (83), the other end of the exhaust pipe (83) being connected to the inner cavity of the piston chamber (52), and a one-way valve being arranged in the exhaust pipe (83).

8. A multi-depth sampling device for water quality for environmental monitoring according to claim 1, characterized in that: The input end of the sampling tube (41) is arranged to be inclined downward, a filter cover (411) is fixedly connected to the input end of the sampling tube (41), and a one-way valve is arranged inside the sampling tube (41).

9. A multi-depth sampling device for water quality for environmental monitoring according to claim 1, characterized in that: The bottom of the inner cavity of each group of sampling chambers (32) is fixed and connected to a water intake pipe (321), and an opening and closing valve is provided on the water intake pipe (321).

10. The multi-depth sampling device for water quality for environmental monitoring according to claim 1, characterized in that: The bottom of the buoyancy ring (1) is fixedly connected to a balancing ball (9), and a plurality of groups of the balancing balls (9) are distributed in a circular shape at equal intervals along the center of the buoyancy ring (1).

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