Lake plankton sample collecting device

Abstract

The invention discloses a lake plankton sample collection device, and particularly relates to the technical field of plankton sample collection, the lake plankton sample collection device comprises a shell, the left end of the shell is fixedly connected with a collection frame, the inner surface of the collection frame is rotatably connected with a box door, and the inner surface of the collection frame is provided with a reciprocating assembly; and a partition collecting assembly is arranged at the lower end of the reciprocating assembly, and the reciprocating assembly comprises a partition plate fixedly connected with the inner surface of the shell. According to the lake plankton sample collecting device, by arranging the reciprocating assembly, an 8-shaped reciprocating path can be formed in lake water, area omission caused by single-direction sampling is avoided, planktons in different distribution areas can be collected, the comprehensiveness of samples is improved, and the lake plankton sample collecting device has the characteristics of periodicity and symmetry; the conical net uniformly passes through water areas in all directions, so that the uniformity of sampling in space is ensured, the capturing probability is improved, and the accuracy and reliability of a sampling result are improved.

Description

Technical Field

[0001] The invention relates to the technical field of plankton sample collection, in particular to a lake plankton sample collection device. Background Art

[0002] Plankton refers to drifting organisms that live in water but lack the ability to move effectively. They are divided into phytoplankton and zooplankton. Some plankton have the ability to swim, but their swimming speed is often slower than the speed of the ocean current in which they are located, so they cannot swim flexibly and effectively in the water. At present, it is necessary to collect lake plankton for research when studying and managing lakes.

[0003] Chinese patent publication number CN114923734B discloses a lake plankton sample collection device, comprising: a mounting bracket, a telescopic device arranged on the top of the mounting bracket, a receiving frame arranged at the output end of the telescopic device, and a carrying plate connected to the bottom of the receiving frame, wherein a bidirectional telescopic device is arranged in the carrying plate, and both output ends of the bidirectional telescopic device are connected to a connecting frame, and a collecting component for collecting plankton is connected to the bottom of the connecting frame. This solution is provided with a collecting component, because the folding cylinder is in a folded state, when the collecting device enters the lake, the impact on the water surface during its entry is small, and the water flow will not be caused to move significantly. The two sets of mounting plates are close to each other, so that the mounting plates move laterally in the lake, so that the water flow can enter the folding cylinder laterally from the water inlet, so that the water flow and plankton at the water inlet are "sucked" into the folding cylinder, thereby improving the collection efficiency and collection quality; However, the above patent document still has the following defects during implementation:

[0004] Although the above patent can improve the collection efficiency and quality during implementation, the single-direction sampling has a small coverage area, which reduces the comprehensiveness of the sample. At the same time, it is impossible to automatically separate plankton of different sizes during the collection process, resulting in cumbersome sorting of mixed samples in the later stage. Summary of the Invention

[0005] The main purpose of the present invention is to provide a lake plankton sample collection device that can effectively solve the problems of being unable to increase the coverage of plankton sampling and automatic separation during the sampling process.

[0006] To achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: a lake plankton sample collection device, comprising a housing, a collection frame fixedly connected to the left end of the housing, a box door rotatably connected to the inner surface of the collection frame, a reciprocating assembly provided on the inner surface of the collection frame, and a partitioned collection assembly provided at the lower end of the reciprocating assembly;

[0007] The reciprocating assembly includes a partition fixedly connected to the inner surface of the shell, the inner surface of the shell is provided with a cross reciprocating mechanism, the front part of the inner surface of the shell is provided with a limiting mechanism, and the inner surface of the cross reciprocating mechanism is provided with a collecting mechanism.

[0008] Preferably, the cross-reciprocating mechanism includes a reciprocating limit cover fixedly connected to the lower part of the inner surface of the shell, the inner surface of the partition is symmetrically connected to a rotating rod, the upper end of the shell is fixedly connected to a motor, the output end of the motor is transmission-connected to one of the rotating rods through a coupling, the outer surfaces of the two rotating rods are fixedly connected to two notch plates, the outer surfaces of the two rotating rods are fixedly connected to gears that are meshed with each other, and a moving rod is commonly provided at the notches on the inner surfaces of the four notch plates.

[0009] Preferably, the limiting mechanism includes a T-shaped fixing plate fixedly connected to the inner surface of the outer shell, the inner surface of the T-shaped fixing plate is rotatably connected to a T-shaped limiting plate, the upper end of the T-shaped fixing plate is fixedly connected to round rod one, the upper end of the T-shaped limiting plate is fixedly connected to round rod two, and the outer surfaces of round rod two and round rod one are jointly provided with a canted spring.

[0010] Preferably, the collecting mechanism includes a connecting rod threadedly connected to the inner surface of the moving rod, the inner surface of the connecting rod is threadedly connected to a fixed ring rod, the inner surface of the fixed ring rod is fixedly installed with a hanging ring, and the lower end of the hanging ring is fixedly connected to the conical net through a pull rope.

[0011] Preferably, the partition collection assembly includes a cylinder fixedly connected to the lower end of the conical net, the inner surface of the cylinder is provided with a sorting mechanism, the lower end of the sorting mechanism is provided with a one-way mechanism, and the inner surface of the cylinder is provided with a collecting mechanism.

[0012] Preferably, the sorting mechanism includes two filter screens fixedly connected to the inner surface of the cylinder, and a bottom frame is fixedly connected to the inner surface of the cylinder below the filter screens, and circular holes are formed on the inner surface of the bottom frame.

[0013] Preferably, the one-way mechanism includes a conical groove rod, the upper end of the conical groove rod is fixedly connected to the bottom frame located on the lower side, the inner surface of the conical groove rod is fixedly connected to an arc hole block, the upper end of the arc hole block is fixedly connected to a spring telescopic rod, and the upper end of the spring telescopic rod is fixedly connected to a ball.

[0014] Preferably, the collecting mechanism includes a connecting ring fixedly connected to the lower part of the inner surface of the cylinder, a connecting plate fixedly connected to the inner surface of the cylinder, a connecting block fixedly connected to the inner surface of the connecting ring, a connecting pipe 1 fixedly connected to the inner surface of the lower filter screen on the inner surface of the connecting block, a connecting pipe 2 fixedly connected to the inner surface of the upper filter screen on the inner surface of the connecting block, and two collecting bottles threadedly connected to the inner surface of the connecting block.

[0015] Preferably, the inner surface of the connecting ring is slidingly connected to push rod 1 which is slidingly connected to the inner surface of the lower filter screen, the inner surface of the connecting ring is slidingly connected to push rod 2 which is slidingly connected to the inner surface of the upper filter screen, the outer surfaces of push rod 1 and push rod 2 are jointly fixedly connected to a circular plate which is slidingly connected to the cylinder, the upper parts of the outer surfaces of push rod 1 and push rod 2 are fixedly connected to blocking blocks, the outer surfaces of push rod 1 and push rod 2 are both sleeved with return springs, and the two ends of the two return springs are respectively fixedly connected to the lower end of the connecting plate and the upper end of the circular plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. In the present invention, by providing a reciprocating component, a figure-8 reciprocating path can be taken in the water of the lake, avoiding regional omissions caused by sampling in a single direction, collecting plankton in different distribution areas, improving the comprehensiveness of the sample, and having the characteristics of periodicity and symmetry, allowing the conical net to pass through the waters in all directions evenly, ensuring the spatial uniformity of sampling, and more accurately reflecting the spatial distribution law of plankton. The irregular water flow disturbance generated during the movement can break the stable suspended state of plankton, prompting plankton in attached or stationary areas to move with the water flow, thereby increasing the capture probability and improving the accuracy and reliability of the sampling results.

[0018] 2. In the present invention, by providing a sorting mechanism and a one-way mechanism, during the process of sampling plankton, the double-layer filter mesh can realize the sorting of plankton according to the difference in pore size. The separation of plankton of different sizes can be completed in one collection, avoiding the tedious sorting of mixed samples in the later stage, improving the sample processing efficiency, reducing the sample transfer loss, and allowing plankton of different sizes to be retained intact. After sorting, plankton samples of each size are preserved independently, providing clear and pure samples for subsequent classification and identification, and ecological research, and facilitating in-depth analysis of the plankton community structure and ecological function of lakes.

[0019] 3. In the present invention, by providing a collection mechanism, with the cooperation of connecting tube 1, connecting tube 2 and blocking block, partitioned storage of samples is achieved, effectively avoiding the mixing of plankton samples of different sizes and types, so that the samples in the collection bottle have a high degree of consistency, which is convenient for subsequent research. At the same time, it reduces the cross contamination and sample loss that may occur during the manual transfer of samples, improves the standardization and effectiveness of sample storage, and provides a more scientific and reliable sample basis for lake plankton research. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the overall cross-sectional structure of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the reciprocating assembly and the partitioned collecting assembly of the present invention;

[0023] Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 5 It is a schematic structural diagram of the cross reciprocating mechanism of the present invention;

[0025] Figure 6 Schematic diagram of the limiting mechanism structure of the present invention;

[0026] Figure 7 It is a schematic diagram of the cross-sectional structure of the collection mechanism of the present invention;

[0027] Figure 8 It is a schematic cross-sectional structure diagram of the sorting mechanism and the one-way mechanism of the present invention;

[0028] Figure 9 Schematic diagram of the cross-sectional structure of the collecting mechanism of the present invention;

[0029] Figure 10 For the present invention Figure 9 Schematic diagram of the enlarged structure at point B in the middle.

[0030] In the figure: 1, shell; 2, collection frame; 3, box door; 4, reciprocating assembly; 41, partition; 42, cross reciprocating mechanism; 421, reciprocating limit cover; 422, rotating rod; 423, notched plate; 424, gear; 425, motor; 426, moving rod; 43, limit mechanism; 431, T-shaped fixed plate; 432, T-shaped limit plate; 433, round rod 1; 434, round rod 2; 435, inclined spring; 44, collection mechanism; 441, connecting rod; 442, fixed ring rod; 443, lifting ring; 444, conical net; 5, Partition collection assembly; 51. Cylinder; 52. Sorting mechanism; 521. Filter screen; 522. Bottom frame; 523. Round hole; 53. One-way mechanism; 531. Conical groove rod; 532. Spring telescopic rod; 533. Arc hole block; 534. Ball; 54. Collection mechanism; 541. Connecting ring; 542. Connecting plate; 543. Push rod one; 544. Push rod two; 545. Connecting pipe one; 546. Connecting pipe two; 547. Blocking block; 548. Return spring; 549. Collection bottle; 5410. Connecting block; 5411. Round plate. DETAILED DESCRIPTION

[0031] Example 1, as Figure 1 and Figure 2As shown, a lake plankton sample collection device includes a shell 1, a collection frame 2 is fixedly connected to the left end of the shell 1, a box door 3 is rotatably connected to the inner surface of the collection frame 2, a reciprocating component 4 is provided on the inner surface of the collection frame 2, and a partition collection component 5 is provided at the lower end of the reciprocating component 4.

[0032] During the implementation of this embodiment, the shell 1 is transported to the place where sampling is required in the lake. It can be fixed by relevant external equipment and provided with relevant power supply. Then the partition collection component 5 is assembled and placed in the water of the lake. The reciprocating component 4 leads the partition collection component 5 to move back and forth in an 8-shaped pattern in the water, so that the partition collection component 5 collects plankton samples in the lake water and automatically sorts them during the collection process. When the collection is completed, the partition collection component 5 is taken out of the water and then stored in partitions.

[0033] Specifically, in order to realize the collection of swimming samples, the water can be moved back and forth in a figure 8 in the lake water. Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 In this embodiment, the reciprocating assembly 4 includes a partition 41 fixedly connected to the inner surface of the shell 1, a cross reciprocating mechanism 42 is provided on the inner surface of the shell 1, a limiting mechanism 43 is provided at the front of the inner surface of the shell 1, and a collection mechanism 44 is provided on the inner surface of the cross reciprocating mechanism 42.

[0034] For further information, see Figure 3 and Figure 5 In this embodiment, the cross-reciprocating mechanism 42 includes a reciprocating limit cover 421 fixedly connected to the lower part of the inner surface of the shell 1, and the inner surface of the partition 41 is symmetrically connected to the rotating rod 422. The upper end of the shell 1 is fixedly connected to a motor 425, and the output end of the motor 425 is transmission-connected to one of the rotating rods 422 through a coupling. The outer surfaces of the two rotating rods 422 are fixedly connected to two notched plates 423, and the outer surfaces of the two rotating rods 422 are fixedly connected to gears 424 that are meshed with each other. A moving rod 426 is commonly provided at the notches on the inner surfaces of the four notched plates 423.

[0035] For further information, see Figure 3 and Figure 7 In this embodiment, the collection mechanism 44 includes a connecting rod 441 threadedly connected to the inner surface of the moving rod 426, the inner surface of the connecting rod 441 is threadedly connected to a fixed ring rod 442, the inner surface of the fixed ring rod 442 is fixedly installed with a hanging ring 443, and the lower end of the hanging ring 443 is fixedly connected to a conical net 444 through a pull rope.

[0036] During the implementation process, the connecting rod 441 is threadedly connected to the moving rod 426, and the fixed ring rod 442 is threadedly connected to the connecting rod 441. Then, the conical net 444 is placed in the water of the lake. At this time, the output end of the starting motor 425 drives the rotating rod 422 on the right to rotate through the coupling. Since the two gears 424 are engaged with each other, the two rotating rods 422 will rotate in the same direction with each other, driving the moving rods 426 on the four notched plates 423 to rotate on the inner surface of the reciprocating limit cover 421, and under the limiting action of the limiting mechanism 43, the moving rod 426 reciprocates in the reciprocating limit cover 421. The cone net 444 can move in a figure 8 shape in the lake water, which greatly expands the sampling coverage and avoids regional omissions caused by sampling in a single direction. It can collect plankton in different distribution areas and improve the comprehensiveness of the sample. It has the characteristics of periodicity and symmetry, allowing the cone net 444 to pass through the waters in all directions evenly, ensuring the uniformity of sampling in space and more accurately reflecting the spatial distribution pattern of plankton. The irregular water flow disturbance generated during the movement can break the stable suspended state of plankton, prompting plankton in attached or stationary areas to move with the water flow, thereby increasing the capture probability and improving the accuracy and reliability of the sampling results.

[0037] For further information, see Figure 3 and Figure 6 In this embodiment, the limiting mechanism 43 includes a T-shaped fixing plate 431 fixedly connected to the inner surface of the shell 1, the inner surface of the T-shaped fixing plate 431 is rotatably connected to a T-shaped limiting plate 432, the upper end of the T-shaped fixing plate 431 is fixedly connected to a round rod 1 433, the upper end of the T-shaped limiting plate 432 is fixedly connected to a round rod 2 434, and the outer surfaces of the round rod 2 434 and the round rod 1 433 are jointly provided with a canted spring 435.

[0038] During implementation, when the moving rod 426 moves to the intersection of the reciprocating limit cover 421, the round block at the upper end of the moving rod 426 will squeeze the T-shaped limit plate 432, so that the T-shaped limit plate 432 rotates to the other direction on the inner surface of the T-shaped fixed plate 431, and the position of the T-shaped limit plate 432 is limited under the deformation force of the inclined spring 435, that is, when the moving rod 426 moves to the right, the T-shaped limit plate 432 tilts to the right, and vice versa, it tilts to the left. Through the action of the T-shaped limit plate 432, the moving rod 426 can follow an 8-shaped trajectory.

[0039] Embodiment 2: Based on embodiment 1, this embodiment adds a partitioning collection component 5 for sorting the collected plankton samples, thereby achieving the purpose of sorting the collected plankton samples.

[0040] Specifically, in order to sort the collected plankton samples, refer to Figure 3 、 Figure 4、 Figure 8 、 Figure 9 and Figure 10 In this embodiment, the partition collection component 5 includes a cylinder 51 fixedly connected to the lower end of the conical net 444, a sorting mechanism 52 is provided on the inner surface of the cylinder 51, a one-way mechanism 53 is provided at the lower end of the sorting mechanism 52, and a collecting mechanism 54 is provided on the inner surface of the cylinder 51.

[0041] For further information, see Figure 3 、 Figure 4 and Figure 8 In this embodiment, the sorting mechanism 52 includes two filter screens 521 fixedly connected to the inner surface of the cylinder 51. A bottom frame 522 is fixedly connected to the inner surface of the cylinder 51 below the filter screens 521. The inner surface of the bottom frame 522 is provided with circular holes 523.

[0042] For further information, see Figure 3 、 Figure 4 and Figure 8 In this embodiment, the one-way mechanism 53 includes a conical groove rod 531, the upper end of the conical groove rod 531 is fixedly connected to the bottom frame 522 located at the lower side, the inner surface of the conical groove rod 531 is fixedly connected to an arc hole block 533, the upper end of the arc hole block 533 is fixedly connected to a spring telescopic rod 532, and the upper end of the spring telescopic rod 532 is fixedly connected to a ball 534.

[0043] During implementation, when the conical net 444 is placed in the lake water and moves in an 8-shaped reciprocating path in the water, the water and plankton in the lake will passively enter the conical net 444. Since the lower end of the conical net 444 is connected to the cylinder 51, the water and plankton will enter the cylinder 51 during the movement of the conical net 444. The water pressure at this time will squeeze the ball 534 to move backward, and the spring telescopic rod 532 will be in a compressed state, so that the inner surface of the conical groove rod 531 is connected to the inner surface of the conical net 444. The movement of the conical net 444 will cause water and plankton to enter the conical net 444 and be discharged from the lower end of the conical net 444, thereby realizing the flow of water and plankton.

[0044] Secondly, after the water and plankton enter the cylinder 51, the plankton in the water is filtered by the two filters 521 and classified according to size. The large plankton will be retained in the space formed by the upper filter 521 and the cylinder 51, and the small plankton will pass through the circular holes 523 on the upper filter 521 and the upper bottom frame 522 to the lower filter 521. The lower filter 521 will retain the small plankton, thereby realizing the sorting of plankton. The water pressure generated by the movement causes the water and plankton to flow in the device. The double-layer filter 521 can complete the separation of plankton of different sizes in one collection due to the difference in pore size, avoiding the tedious sorting of mixed samples in the later stage, improving sample processing efficiency, reducing sample transfer loss, and allowing plankton of different sizes to be retained intact. After sorting, plankton samples of each size are independently preserved, providing clear and pure samples for subsequent classification and identification, and ecological research, and facilitating in-depth analysis of the community structure and ecological function of lake plankton.

[0045] In the adjacent filter screens 521 and bottom frames 522 , the diameter of the circular hole 523 on the bottom frame 522 is consistent with the aperture size of the adjacent filter screen 521 , and the aperture of the upper filter screen 521 is larger than that of the lower filter screen 521 .

[0046] For further information, see Figure 3 、 Figure 4 、 Figure 9 and Figure 10 In this embodiment, the collecting mechanism 54 includes a connecting ring 541 fixedly connected to the lower portion of the inner surface of the cylinder 51, a connecting plate 542 fixedly connected to the inner surface of the cylinder 51, a connecting block 5410 fixedly connected to the inner surface of the connecting ring 541, a connecting pipe 1 545 fixedly connected to the inner surface of the lower filter screen 521 fixedly connected to the inner surface of the connecting block 5410, a connecting pipe 2 546 fixedly connected to the inner surface of the upper filter screen 521 fixedly connected to the inner surface of the connecting block 5410, and two collecting bottles 549 threadedly connected to the inner surface of the connecting block 5410.

[0047] For further information, see Figure 3 、 Figure 4 、 Figure 9 and Figure 10In this embodiment, the inner surface of the connecting ring 541 is slidably connected to the push rod 1 543 which is slidably connected to the inner surface of the lower filter screen 521, and the inner surface of the connecting ring 541 is slidably connected to the push rod 2 544 which is slidably connected to the inner surface of the upper filter screen 521. The outer surfaces of the push rod 1 543 and the push rod 2 544 are jointly fixedly connected to a circular plate 5411 which is slidably connected to the cylinder 51. The upper parts of the outer surfaces of the push rod 1 543 and the push rod 2 544 are fixedly connected to a blocking block 547. The outer surfaces of the push rod 1 543 and the push rod 2 544 are both sleeved with a return spring 548, and the two ends of the two return springs 548 are respectively fixedly connected to the lower end of the connecting plate 542 and the upper end of the circular plate 5411.

[0048] During the implementation process, when the collection is completed, the conical net 444 is lifted away from the lake, and then the water in the conical net 444 will flow out through the holes in the conical net 444, and the remaining water and plankton will be retained in the cylinder 51. When it is necessary to collect samples of plankton of different sizes, the two collecting bottles 549 are respectively threadedly connected to the inner surface of the connecting block 5410, and then the push rod 1 543 and the push rod 2 544 can be pushed to slide upward, driving the circular plate 5411 to move upward, and the reset spring 548 is in a compressed state, and the two blocking blocks 547 are respectively Away from the upper ends of connecting tube 1 545 and connecting tube 2 546, the sorted plankton and water enter two collecting bottles 549 through connecting tube 1 545 and connecting tube 2 546 respectively, realizing partitioned storage of samples, effectively avoiding the mixing of plankton samples of different sizes and types, making the samples in collecting bottles 549 highly consistent, facilitating subsequent research, and reducing the cross contamination and sample loss that may occur during the manual transfer of samples, thereby improving the standardization and effectiveness of sample storage and providing a more scientific and reliable sample basis for lake plankton research.

[0049] In the one-way mechanism 53, after the conical net 444 is lifted, the water pressure in the cylinder 51 is not enough to deform the spring telescopic rod 532, that is, after lifting, the conical groove rod 531 is in a closed state.

[0050] Working process: When in use, the cross reciprocating mechanism 42 and the limiting mechanism 43 cooperate with each other to drive the collecting mechanism 44 to perform an 8-shaped movement in the lake water. During the movement, the sorting mechanism 52 and the one-way mechanism 53 are used to separate the plankton during the flow and collection of water and plankton, avoiding the tedious sorting of mixed samples in the later stage. The separated plankton is then collected in partitions through the collecting mechanism 54.

[0051] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A lake plankton sample collection device, comprising a housing (1), characterized in that: The left end of the housing (1) is fixedly connected to a collecting frame (2), the inner surface of the collecting frame (2) is rotatably connected to a box door (3), the inner surface of the collecting frame (2) is provided with a reciprocating assembly (4), and the lower end of the reciprocating assembly (4) is provided with a partition collecting assembly (5); The reciprocating assembly (4) comprises a partition (41) fixedly connected to the inner surface of the shell (1); a cross-reciprocating mechanism (42) is provided on the inner surface of the shell (1); a limiting mechanism (43) is provided at the front of the inner surface of the shell (1); and a collecting mechanism (44) is provided on the inner surface of the cross-reciprocating mechanism (42).

2. A lake plankton sample collection device according to claim 1, characterized in that: The cross reciprocating mechanism (42) includes a reciprocating limit cover (421) fixedly connected to the lower portion of the inner surface of the housing (1); the inner surface of the partition (41) is symmetrically connected to a rotating rod (422); the upper end of the housing (1) is fixedly connected to a motor (425); the output end of the motor (425) is transmission-connected to one of the rotating rods (422) via a coupling; the outer surfaces of the two rotating rods (422) are fixedly connected to two notched plates (423); the outer surfaces of the two rotating rods (422) are fixedly connected to gears (424) that are meshed with each other; and a moving rod (426) is commonly provided at the notches on the inner surfaces of the four notched plates (423).

3. The lake plankton sample collection device according to claim 1, characterized in that: The limiting mechanism (43) comprises a T-shaped fixing plate (431) fixedly connected to the inner surface of the housing (1); the inner surface of the T-shaped fixing plate (431) is rotatably connected to a T-shaped limiting plate (432); the upper end of the T-shaped fixing plate (431) is fixedly connected to a round rod 1 (433); the upper end of the T-shaped limiting plate (432) is fixedly connected to a round rod 2 (434); and the outer surfaces of the round rod 2 (434) and the round rod 1 (433) are both provided with an inclined tension spring (435).

4. A lake plankton sample collection device according to claim 2, characterized in that: The collecting mechanism (44) comprises a connecting rod (441) threadedly connected to the inner surface of the moving rod (426); a fixing ring rod (442) is threadedly connected to the inner surface of the connecting rod (441); a hanging ring (443) is fixedly mounted on the inner surface of the fixing ring rod (442); and the lower end of the hanging ring (443) is fixedly connected to the conical net (444) via a pull rope.

5. The lake plankton sample collection device according to claim 4, characterized in that: The partition collection assembly (5) comprises a cylinder (51) fixedly connected to the lower end of the conical net (444); a sorting mechanism (52) is provided on the inner surface of the cylinder (51); a one-way mechanism (53) is provided at the lower end of the sorting mechanism (52); and a collecting mechanism (54) is provided on the inner surface of the cylinder (51).

6. A lake plankton sample collection device according to claim 5, characterized in that: The sorting mechanism (52) comprises two filter screens (521) fixedly connected to the inner surface of the cylinder (51); a bottom frame (522) is fixedly connected to the inner surface of the cylinder (51) below the filter screens (521); and circular holes (523) are provided on the inner surface of the bottom frame (522).

7. A lake plankton sample collection device according to claim 6, characterized in that: The one-way mechanism (53) comprises a tapered slot rod (531), the upper end of the tapered slot rod (531) being fixedly connected to the bottom frame (522) located at the lower side, the inner surface of the tapered slot rod (531) being fixedly connected to an arc hole block (533), the upper end of the arc hole block (533) being fixedly connected to a spring telescopic rod (532), and the upper end of the spring telescopic rod (532) being fixedly connected to a ball (534).

8. The lake plankton sample collection device according to claim 6, characterized in that: The collecting mechanism (54) comprises a connecting ring (541) fixedly connected to the lower portion of the inner surface of the cylinder (51), a connecting plate (542) fixedly connected to the inner surface of the cylinder (51), a connecting block (5410) fixedly connected to the inner surface of the connecting ring (541), a connecting pipe 1 (545) fixedly connected to the inner surface of the lower filter screen (521) fixedly connected to the inner surface of the connecting block (5410), a connecting pipe 2 (546) fixedly connected to the inner surface of the upper filter screen (521) fixedly connected to the inner surface of the connecting block (5410), and two collecting bottles (549) threadedly connected to the inner surface of the connecting block (5410).

9. The lake plankton sample collection device according to claim 8, characterized in that: The inner surface of the connecting ring (541) is slidably connected to the push rod 1 (543) which is slidably connected to the inner surface of the lower filter screen (521); the inner surface of the connecting ring (541) is slidably connected to the push rod 2 (544) which is slidably connected to the inner surface of the upper filter screen (521); the outer surfaces of the push rod 1 (543) and the push rod 2 (544) are fixedly connected to a circular plate (5411) which is slidably connected to the cylinder (51); the upper parts of the outer surfaces of the push rod 1 (543) and the push rod 2 (544) are fixedly connected to a blocking block (547); the outer surfaces of the push rod 1 (543) and the push rod 2 (544) are both sleeved with a return spring (548); the two ends of the two return springs (548) are fixedly connected to the lower end of the connecting plate (542) and the upper end of the circular plate (5411), respectively.

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