Different-depth zooplankter sampling device for water ecology monitoring

Abstract

The invention relates to a different-depth zooplankter sampling device for water ecology monitoring, which is characterized in that a plurality of sample bins in a sampling cylinder are connected in series by a water inlet cylinder, a sample injection nozzle is arranged on the cylinder wall of the water inlet cylinder, a piston block is axially and slidably mounted in the sample injection nozzle, a first magnet is arranged in the piston block, and a sealing plate is fixed at one end, facing the sample bin, of the piston block; the piston block is in elastic sliding connection with the sample injection nozzle; a mounting block is fixed at the free end of a push rod which is coaxially mounted in the sampling cylinder and can axially move, a second magnet is arranged in the mounting block, a piston ring is coaxially fixed at the position, close to the mounting block, of the push rod, is axially mounted in the water inlet cylinder in a sliding and sealing manner, and is in contact with a stop part at the inlet end of the water inlet cylinder; the mounting block is positioned outside the water inlet cylinder; a driving element is mounted at one end, deviating from the inlet end, of the sampling barrel, and drives the push rod to axially move and positively and negatively rotate at a set rotating angle. The zooplankter sampling device can quickly and reliably sample zooplankter at different depths.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water ecological monitoring sampling equipment, and particularly relates to a water ecological monitoring different depth zooplankton sampling device. BACKGROUND

[0002] The health status of the water ecological system has a vital influence on ecological balance, biodiversity protection and rational utilization of water resources. As a key biological component in the water ecological system, the species, quantity and distribution of zooplankton can directly reflect the ecological quality, nutrient level and many other characteristics of the water body.

[0003] At present, for the sampling of underwater zooplankton, there are mainly two sampling tools, a plankton net and an organic glass water sampler. The organic glass water sampler is specially designed for the collection of water samples in the depth of 0-30 meters in rivers, lakes and reservoirs and the like, and the upper cover and the lower cover thereof can be easily turned over to realize convenient opening and closing. In use, first, the outlet rubber tube is clamped by an iron clamp, and then the water sampler is sunk into the water, at this time, the bottom water inlet is automatically opened to start collecting water samples, when the water samples are full, the tether is lifted to take out the water sampler from the water surface, in use, attention should be paid to avoiding touching the bottom to prevent water sample leakage, finally, the water samples are injected into a container through the outlet rubber tube.

[0004] In the existing way of directly collecting water samples to collect zooplankton specimens, different depths are collected by multiple sampling, because after the organic glass bottle is lowered to the corresponding depth, it is taken out, the sample water is taken out by the above method, and then cleaned, and then lowered to another depth to be sampled again. Therefore, the sampler needs to be taken out from the water multiple times, that is, the organic glass water sampler is taken out, which is very time-consuming, and multiple sampling needs multiple cleaning, which not only wastes time, but also easily causes the mixing of samples at different depths due to incomplete cleaning. In addition, since the sampler is taken out by hand, the samples at different depths need to be manually recorded. Finally, the existing organic glass water sampler is easy to mix with large garbage and dregs, which not only affects the extraction of zooplankton, but also may cause the corresponding port of the organic glass water sampler to be blocked, so that the corresponding bottle cap cannot be automatically opened and closed, causing the failure of zooplankton sample collection. SUMMARY

[0005] Therefore, the purpose of the present application is to provide a water ecological monitoring different depth zooplankton sampling device to solve the problems of inconvenient sample collection, extraction and recording in the background art, and the mixing and pollution of samples at different depths due to improper cleaning when a sampler is shared.

[0006] The application is achieved by the following technical scheme: a different-depth plankton sampling device for water ecological monitoring, comprising a sampling cylinder for containing a water sample, a plurality of sample chambers are arranged in the sampling cylinder in an axial direction, all the sample chambers are fixed together in series by an inlet cylinder installed in an axial direction, so that the sample chambers form a circular annular cavity, an inlet nozzle protruding towards the inside of the sample chamber is arranged on the cylinder wall of the inlet cylinder in a radial direction, a piston block is slidably installed in the inlet nozzle in an axial direction, a first magnet is arranged in the piston block, a sealing plate is fixed to one end of the piston block facing the sample chamber, the piston block is elastically and slidably connected with the inlet nozzle, and the outlet end of the inlet nozzle is closed by the sealing plate in a normal state; a push rod coaxially installed in the sampling cylinder and capable of moving in an axial direction is further included, an installation block is fixed to the free end of the push rod, a second magnet is arranged in the installation block, a piston ring is coaxially fixed to the installation block of the push rod, the piston ring is slidably and sealingly installed in the inlet cylinder in an axial direction, and the installation block is located outside the inlet cylinder in a normal state; a driving element is installed at one end of the sampling cylinder away from the inlet end of the sampling cylinder, the driving element drives the push rod to move in an axial direction and rotate in a positive or negative direction by a set angle, so that the installation block can move to a position opposite to each inlet nozzle during the movement of the push rod away from the inlet end of the inlet cylinder, and then the second magnet exerts a repulsive force on the first magnet to make the piston block move upwards, and the lower sealing plate is separated from the outlet end of the inlet nozzle.

[0007] Further, the inlet nozzle has a stepped hole, a larger hole section of the stepped hole is directly communicated with the inlet cylinder, and the port of a smaller hole section of the stepped hole serves as the outlet end of the inlet nozzle.

[0008] Further, the piston block comprises a piston plate, the central part of the piston plate has a connecting column coaxial with the stepped hole, and the end of the connecting column away from the piston plate is perpendicularly fixed with the sealing plate.

[0009] Further, a slide rod is fixed to the outer sidewall of the piston plate, the slide rod is axially and slidingly fitted into the hole wall of the smaller hole section of the stepped hole, and is connected with a compression spring in the inlet nozzle.

[0010] Further, the second magnet is a strip-shaped permanent magnet, and the second magnet is arranged in the connecting column; the first magnet is also a strip-shaped permanent magnet, and when the two permanent magnets are opposite to each other with the same polarity, the sealing plate is completely opened.

[0011] Further, in a normal state, the compression spring enables the piston plate to block the larger hole section, and the inner wall thereof is flush with the inner hole wall of the inlet cylinder; a plurality of water-permeable holes are arranged on the piston plate, and the water-permeable holes include at least one of a circular hole, a strip hole and a waist hole.

[0012] Further, the inlet end of the sampling cylinder coaxially has a horn cover communicated therewith, and a filter screen disc is fixed to the cover opening end of the horn cover.

[0013] Furthermore, the filter screen has a solid disc structure in the center; a connecting rod is coaxially provided inside the push rod, and the guide key on the side wall of the connecting rod slides in contact with the strip-shaped sliding hole on the inner wall of the push rod. One end of the connecting rod extends out of the push rod toward one end of the filter screen and passes through the disc structure in an axial sliding and rotational fit. A scraper arm is vertically fixed thereafter, and the scraper arm rotates in contact with the end face of the filter screen so that when the push rod rotates forward and backward at a set angle, the scraper arm scrapes off the filter residue on the end face of the filter screen.

[0014] Furthermore, a pressure ring is provided on the inner wall of the horn cover with a threaded fit. The installation position of the pressure ring allows the scraper arm to rotate between the filter screen and the pressure ring.

[0015] Furthermore, the driving element includes a power chamber fixed to the closed end of the sampling tube. A hydraulic cylinder is coaxially arranged inside the power chamber with the sampling tube. One section of the hydraulic cylinder is rotatably mounted inside the power chamber but cannot move axially. A driven gear is coaxially fixed on the hydraulic cylinder, and the driven gear meshes with the driving gear driven by the drive motor installed inside the power chamber. The piston rod inside the hydraulic cylinder is coaxially fixed with the push rod, and the oil pump connected to the hydraulic cylinder is installed opposite to the drive motor inside the power chamber.

[0016] The beneficial effects of this invention are as follows:

[0017] This aquatic ecosystem monitoring device for zooplankton sampling at different depths utilizes a specially designed sample inlet tube with multiple sample compartments. A push rod drives the sampling from each compartment, facilitating the sequential recording of zooplankton samples at different depths. The device is simple, reliable, and easy to manufacture, effectively preventing sample mixing and contamination from different depths. Furthermore, it incorporates a filter screen and scraper arm, automatically cleaning the filter screen during each sampling process. This not only prevents debris and impurities from entering the sampling tube but also ensures the filter screen's filtration performance by cleaning it simultaneously with each sample collection, thus preventing zooplankton sample collection failures.

[0018] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0019] Figure 1 This is a partial axial cross-sectional view of the zooplankton sampling device for water ecological monitoring of the present invention when it is placed vertically.

[0020] Figure 2 for Figure 1Enlarged view of the structure at point A when it is placed horizontally;

[0021] Figure 3 for Figure 2 Enlarged view of the structure at point C;

[0022] Figure 4 for Figure 3 The diagram shown illustrates the structure when the sealing plate is open.

[0023] Figure 5 Diagram showing the relative positions of the mounting block at the end of the push rod and the piston block when the sealing plate is opened;

[0024] Figure 6 This is another installation structure diagram for the mounting block;

[0025] Figure 7 for Figure 2 MM section view in the middle;

[0026] Figure 8 This is a structural diagram of the axial sliding fit between the connecting rod and the push rod.

[0027] Figures 9-10 This is a structural diagram showing the arrangement of water permeable holes on the piston plate.

[0028] Figure 11 for Figure 1 Enlarged view of the structure at point B.

[0029] In the diagram: 1. Sampling cylinder; 2. Sample chamber; 3. Partition plate; 4. Water inlet cylinder; 401. Stop section; 5. Power chamber; 6. Horn cover; 7. Push rod; 701. Strip groove; 8. Piston ring; 9. Mounting block; 10. First magnet; 11. Inlet nozzle; 12. Piston block; 1201. Connecting column; 1202. Piston plate; 120201. Water permeable hole; 13. Second magnet; 14. Sealing plate; 15. Compression spring; 16. Slide rod; 17. Stepped hole; 17. Smaller hole section; 1701. Larger hole section; 1702. Connecting rod; 18. Filter screen; 19. Scraper arm; 20. Solid disc; 21. Pressure ring; 22. Guide key; 23. Hydraulic cylinder; 24. Piston rod; 2401. Driven gear; 25. Drive motor; 26. Drive gear; 27. Oil pump; 28. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0031] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0032] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0033] Please see Figures 1-3This invention provides a technical solution: a sampling device for zooplankton at different depths for aquatic ecological monitoring, comprising a sampling cylinder 1 for containing water samples, and several sample chambers 2 arranged axially within the sampling cylinder 1. In practice, these chambers can be separated by several partitions 3 to form multiple sample chambers 2. All sample chambers 2 are connected in series and fixed together by an axially mounted inlet cylinder 4, so that the sample chambers 2 form an annular cavity. In practice, the sample chambers 2 and the inlet cylinder 4 can be integrally formed. On the cylinder wall of the inlet cylinder 4, a sampling nozzle 11 protruding towards the interior of the sample chamber 2 is provided radially. A piston block 12 is slidably installed axially within the sampling nozzle 11. A first magnet 10 is provided within the piston block 12. A sealing plate 14 is fixed to one end of the piston block 12 facing the interior of the sample chamber 2. The piston block 12 and the sampling nozzle 11 are elastically slidably connected; that is, under normal conditions, due to the elastic connection, the sealing plate 14 is positioned to close the outlet end of the sampling nozzle 11, i.e., the end of the sampling nozzle 11 located inside the sample chamber 2 is closed. In this embodiment, a push rod 7 coaxially mounted inside the sampling cylinder 1 and capable of axial movement is also included. A mounting block 9 is fixed to the free end of the push rod 7, and the mounting block 9 contains a second magnet 13. Specifically, in manufacturing, a strip-shaped mounting block 9 can be fixed radially to one side wall of the free end of the push rod 7. Simultaneously, a piston ring 8 is coaxially fixed to the push rod 7 near the mounting block 9. This piston ring 8 is axially and slidingly sealed inside the water inlet cylinder 4. Under normal conditions, i.e., in the initial position, the piston ring 8 contacts the stop portion 401 at the inlet end of the water inlet cylinder 4, while the mounting block 9 is located outside the water inlet cylinder 4. The polarities of the two magnets are aligned; for example, the south poles of both magnets are vertically downwards, so that when the mounting block 9 rotates 180 degrees with the push rod 7, the north poles of the two magnets face each other, thus exerting an upward pushing force on the piston block 12. When the mounting block 9... As the push rod 7 moves axially backward from its initial position to directly below the piston block 12, the attraction between the two magnets gradually increases, preventing the sealing plate 14 from opening. However, when the push rod 7 rotates 180 degrees, the repulsive force between the two magnets rapidly moves the piston block 12, opening the sealing plate 14 and allowing water to flow from the inlet cylinder 4 and the sample inlet 11 into the corresponding sample chamber 2. Specifically, the sealing plates 14 in the corresponding sample chamber 2 can be opened sequentially for different depths, resulting in samples from several consecutive sample chambers 2 containing zooplankton samples at corresponding depths. The mounting structure of the mounting block 9 at the end of the push rod 7 can be as follows... Figure 2 It is offset to one side as shown, or fixed to the end of the push rod 7 perpendicular to the center of the mounting block 9.

[0034] In this embodiment, in order to realize the movement of the push rod 7, a driving element is installed at the end of the sampling tube 1 away from its inlet end. This driving element drives the push rod 7 to move axially and rotate in both directions at a set angle, such as a set 180 degrees, so that when the push rod 7 moves away from its inlet end in the water inlet tube 4, the mounting block 9 can move to the position directly opposite each sampling nozzle 11. Then, the set angle is rotated so that when the same poles of the two magnets are directly opposite each other, the second magnet 13 applies a repulsive force to the first magnet 10, causing the piston block 12 to move upward and the lower sealing plate 14 to separate from the outlet end of the sampling nozzle 11.

[0035] In specific implementation, such as Figure 3 As shown, the injection nozzle 11 has a stepped hole 17. The larger section 1702 of this stepped hole 17 is directly connected to the water inlet cylinder 4, and the port of the smaller section 1701 serves as the outlet end of the injection nozzle 11. This stepped hole 17 is used to install the piston block 12. In specific manufacturing, as shown... Figure 3 The piston block 12 includes a piston plate 1202, with a connecting post 1201 coaxial with the stepped hole 17 at the center of the piston plate 1202. A sealing plate 14 is fixed perpendicularly to one end of the connecting post 1201 away from the piston plate 1202. To achieve elastic connection of the piston block 12 within the injection nozzle 11, as... Figure 3 As shown, a sliding rod 16 is fixed on the outer wall of the piston plate 1202. The sliding rod 16 is axially slidably inserted into the wall of the smaller section 1701 of the stepped hole 17 and connected to the anti-compression spring 15 inside the sampling nozzle. In the above embodiment, the second magnet 13 is a bar-shaped permanent magnet. The second magnet 13 is built into the connecting post 1201. The first magnet 10 is also a bar-shaped permanent magnet. When the two permanent magnets are aligned with the same pole, as shown... Figures 4-5 The sealing plate 14 was completely opened.

[0036] To facilitate the axial sliding of the piston ring 8 within the water inlet cylinder 4, under normal conditions, the anti-compression spring 15 allows the piston plate 1202 to block the larger orifice section 1702, and its inner wall is flush with the inner wall of the water inlet cylinder 4; the piston plate 1202 is provided with several water-permeable holes 120201, such as... Figures 9-10 The permeable holes 120201 include at least one of round holes, strip holes and waist holes, so that different types of zooplankton can enter with the water.

[0037] In this embodiment, as Figure 2 As shown, a horn cover 6 is coaxially connected to the inlet end of the sampling tube 1. A filter screen 19 is fixed to the opening end of the horn cover 6 to filter out larger debris and scum in the water. In specific manufacturing, as shown... Figure 2 and Figure 7 As shown, a solid disc structure is located in the center of the filter screen 19. A connecting rod 18 is coaxially mounted inside the push rod 7, as shown...Figure 8 The guide key 23 on the side wall of the connecting rod 18 slides in contact with the strip-shaped sliding hole on the inner wall of the push rod 7. One end of the connecting rod 18 extends out of the push rod 7 toward the end of the filter screen 19 and passes through the disc structure in an axial sliding and rotational fit. A scraper arm 20 is vertically fixed thereon. This scraper arm 20 rotates in contact with the end face of the filter screen 19, so that when the push rod 7 rotates forward and backward at a set angle, the scraper arm 20 scrapes off the filter residue on the end face of the filter screen 19, preventing excessive garbage and scum from clogging the filter screen 19.

[0038] In this embodiment, a pressure ring 22 is provided on the inner side wall of the horn cover 6 with a threaded fit. The threaded pressure ring 22 makes its position adjustable, that is, the installation position of the pressure ring 22 allows the scraper arm 20 to rotate between the filter screen 19 and the pressure ring 22.

[0039] In this embodiment, as Figure 1 and Figure 11 The driving element includes a power chamber 5 fixed to the closed end of the sampling cylinder 1. A hydraulic cylinder 24 is coaxially mounted within the power chamber 5, with one section of the hydraulic cylinder 24 rotatably but not axially movable. A driven gear 25 is coaxially fixed to the hydraulic cylinder 24. The driven gear 25 meshes with a drive gear 27 driven by a drive motor 26 installed within the power chamber 5, thereby driving the hydraulic cylinder 24 to rotate. This causes the piston rod 2401 within the hydraulic cylinder 24 to be coaxially fixed to the push rod 7, thus enabling axial movement and rotation of the push rod 7. During installation, the oil pump 28 connected to the hydraulic cylinder 24 is preferably mounted opposite the drive motor 26 within the power chamber 5 to balance the weight of the entire structure.

[0040] In the above embodiments, the aquatic ecological monitoring zooplankton sampling device at different depths is first submerged at the corresponding depth underwater. Then, the oil pump 28 is started, pushing the piston rod 2401 in the hydraulic cylinder 24 to retract axially, causing the push rod 7 to move towards the installation chamber. When the installation block 9 is aligned with the corresponding inlet 11, the push rod 7 rotates 180 degrees, causing the first magnet 10 in the installation block 9 and the second magnet 13 in the piston block 12 to be aligned with each other, thereby pushing open the sealing plate 14 and allowing water at the corresponding depth to enter the sample chamber 2. It is worth noting that in the above embodiments, the piston ring 8 has two key functions: first, when moving back and forth, it cleans and wipes away zooplankton from other depths that may remain or adhere to the inner wall of the water inlet cylinder 4; second, it prevents the water from filling the entire water inlet cylinder 4, which could lead to contamination of the inner wall of the water inlet cylinder 4 by residual zooplankton samples from other depths, and ensures that the sample chamber 2 is full after a sufficiently long time.

[0041] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A sampling device for zooplankton at different depths for aquatic ecological monitoring, comprising a sampling tube (1) for containing water samples, characterized in that: The sampling tube (1) has several sample chambers (2) arranged along the axial direction. All sample chambers (2) are connected in series and fixed together by an axially installed water inlet tube (4) so ​​that the sample chambers (2) form a circular cavity. The water inlet tube (4) has a radially arranged inlet nozzle (11) that protrudes into the sample chamber (2). A piston block (12) is axially slidably installed in the inlet nozzle (11). The piston block (12) has a first magnet (10) inside. A sealing plate (14) is fixed at one end of the piston block (12) facing the sample chamber (2). The piston block (12) is elastically slidably connected to the inlet nozzle (11). Under normal conditions, the sealing plate (14) closes the outlet end of the inlet nozzle (11). It also includes a push rod (7) that is coaxially installed in the sampling tube (1) and can move axially. A mounting block (9) is fixed at the free end of the push rod (7). The mounting block (9) has a second magnet (13) built in it. A piston ring (8) is also coaxially fixed to the push rod (7) near the mounting block (9). The piston ring (8) is axially slidably and sealed in the water inlet tube (4). Under normal conditions, the piston ring (8) is in contact with the stop (401) at the inlet end of the water inlet tube (4), while the mounting block (9) is located outside the water inlet tube (4), and the polarity of the two magnets is the same. The sampling tube (1) has a drive element installed at the end away from its inlet end. The drive element drives the push rod (7) to move axially and rotate in both directions at a set angle. As the push rod (7) moves away from its inlet end in the water inlet tube (4), the mounting block (9) can move to the position directly opposite each injection nozzle (11). Then, when the set angle is rotated so that the same poles of the two magnets are directly opposite each other, the second magnet (13) applies a repulsive force to the first magnet (10), causing the piston block (12) to move upward and the lower sealing plate (14) to separate from the outlet end of the injection nozzle (11).

2. The aquatic ecological monitoring zooplankton sampling device at different depths according to claim 1, characterized in that: The injection nozzle (11) has a stepped hole (17), the larger section (1702) in the stepped hole (17) is directly connected to the water inlet cylinder (4), and the port of the smaller section (1701) serves as the outlet end of the injection nozzle (11).

3. The aquatic ecological monitoring zooplankton sampling device at different depths according to claim 2, characterized in that: The piston block (12) includes a piston plate (1202), and the piston plate (1202) has a connecting post (1201) coaxial with the stepped hole (17) at its center. The end of the connecting post (1201) facing away from the piston plate (1202) is fixed with the sealing plate (14) perpendicularly thereto.

4. The aquatic ecological monitoring zooplankton sampling device at different depths according to claim 3, characterized in that: A slide rod (16) is fixed on the outer wall of the piston plate (1202). The slide rod (16) is axially slidably inserted into the wall of the smaller hole section (1701) of the stepped hole (17) and connected to the anti-compression spring (15) inside the sampling nozzle.

5. The aquatic ecological monitoring zooplankton sampling device at different depths according to claim 4, characterized in that: The second magnet (13) is a bar-shaped permanent magnet, and the second magnet (13) is built into the connecting column (1201); the first magnet (10) is also a bar-shaped permanent magnet. When the two permanent magnets are aligned with the same pole, the sealing plate (14) is completely opened.

6. The aquatic ecological monitoring zooplankton sampling device at different depths according to claim 3, characterized in that, Under normal conditions, the compression spring (15) enables the piston plate (1202) to block the larger hole section (1702), and its inner wall is flush with the inner wall of the water inlet cylinder (4); the piston plate (1202) is provided with a number of water-permeable holes (120201), and the water-permeable holes (120201) include at least one of round holes, strip holes and waist holes.

7. The aquatic ecological monitoring zooplankton sampling device at different depths according to claim 1, characterized in that: The sampling tube (1) has a horn cover (6) coaxially connected to its inlet end, and a filter screen (19) is fixed at the opening end of the horn cover (6).

8. The aquatic ecological monitoring zooplankton sampling device at different depths according to claim 7, characterized in that: The filter screen (19) has a solid disc structure in the center; a connecting rod (18) is coaxially provided inside the push rod (7). The guide key (23) on the side wall of the connecting rod (18) slides in contact with the strip-shaped sliding hole on the inner wall of the push rod (7). One end of the connecting rod (18) extends out of the push rod (7) toward the end of the filter screen (19) and passes through the disc structure in an axial sliding and rotational fit. A scraper arm (20) is vertically fixed thereon. The scraper arm (20) rotates in contact with the end face of the filter screen (19) so that when the push rod (7) rotates forward and backward at a set angle, the scraper arm (20) scrapes off the filter residue on the end face of the filter screen (19).

9. The aquatic ecological monitoring zooplankton sampling device at different depths according to claim 8, characterized in that: The inner wall of the horn cover (6) is threaded with a pressure ring (22). The installation position of the pressure ring (22) allows the scraper arm (20) to rotate between the filter screen (19) and the pressure ring (22).

10. The aquatic ecological monitoring device for zooplankton sampling at different depths according to claim 1, characterized in that: The driving element includes a power chamber (5) fixed to the closed end of the sampling tube (1). A hydraulic cylinder (24) is coaxially arranged in the power chamber (5) with the sampling tube (1). One section of the hydraulic cylinder (24) is rotatably installed in the power chamber (5) but cannot move axially. A driven gear (25) is coaxially fixed on the hydraulic cylinder (24). The driven gear (25) meshes with the driving gear (27) driven by the drive motor (26) installed in the power chamber (5). The piston rod (2401) in the hydraulic cylinder (24) is coaxially fixed with the push rod (7). The oil pump (28) connected to the hydraulic cylinder (24) is installed in the power chamber (5) opposite to the drive motor (26).

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