Sediment sampling device for water ecology investigation
By using a pressure sensor and sealing assembly in the sediment sampling device to automatically tighten the sampling bag port, the problems of sample spillage and contamination are solved, achieving an efficient and convenient sample collection process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- WATER ENG ECOLOGICAL INST CHINESE ACAD OF SCI
- Filing Date
- 2026-01-30
- Publication Date
- 2026-04-24
AI Technical Summary
Existing sediment sampling devices are prone to sample spillage during the lifting process, and the sealing operation is cumbersome and easily causes sample contamination, increasing the process and time costs of sample processing.
When a pressure sensor detects that the sampling bag is full of sediment, the sealing assembly automatically tightens the drawstring to close the sampling bag port. Combined with the vibration motor control and sealing assembly, this ensures that the sample does not leak during the lifting process and simplifies the sealing operation.
It effectively prevents sample spillage and contamination, simplifies the sealing process, and reduces the complexity and cost of sample processing.
Smart Images
Figure CN121917280A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of water pollution detection, and in particular to a sediment sampling device for aquatic ecological surveys. Background Technology
[0002] Submarine sediments are an important component of aquatic ecosystems. By sampling and analyzing sediments, we can accurately grasp the physicochemical properties, biodiversity, and pollution history of the bottom sediments, providing a scientific basis for identifying environmental problems. Therefore, efficient and accurate sediment sampling techniques and devices are indispensable key support for aquatic ecological surveys.
[0003] The current sediment sampling device operates by first lowering it to the sediment surface of the target water area using ropes, with the sampling head facing downwards. After activating the vibration device, the sampling head is driven deeper into the sediment layer. During the descent, sediment enters a pre-installed sampling bag inside the device through the sampling head's inlet. Once the bag is full, the operator uses ropes to lift the entire sampling device above the water surface. The outer casing is then disassembled, and the sampling bag containing the sediment sample is removed, completing one sampling operation.
[0004] However, during the process of lifting the sampling device out of the water, due to factors such as device shaking and water flow impact, some sediment samples at the opening of the sampling bag are very likely to overflow from the feed inlet of the sampling head, resulting in a loss of sample volume. Moreover, the sediment samples remaining at the bag opening during the removal of the sampling bag are very likely to adhere to the hands of the staff, which not only causes sample contamination but also causes great inconvenience to the operators, increasing the procedures and time costs of sample processing. Summary of the Invention
[0005] In order to improve the problems of sample overflow and loss, cumbersome sealing operation and easy sample contamination in existing sediment sampling devices, this application provides a sediment sampling device for aquatic ecological survey.
[0006] The sediment sampling device for aquatic ecological survey provided in this application adopts the following technical solution: A sediment sampling device for aquatic ecological survey includes a sampling tube, a sampling bag, a sampling head, a top cover, a vibration motor, and a sealing assembly; The sampling cylinder is provided with a sampling chamber for placing the sampling bag, and an inlet and an outlet communicating with the sampling chamber. The sampling head is threadedly connected to the inlet of the sampling cylinder, and the top cover is threadedly connected to the outlet of the sampling cylinder. The vibration motor is installed on the top cover. The side wall of the sampling cylinder has a water outlet communicating with the sampling chamber. The sampling bag is provided with a drawstring for tightening the port near the port of the sampling head. The sampling cylinder is provided with a sealing assembly for pulling the drawstring. A pressure sensor is provided between the top cover and the sampling bag, and is connected to the sealing assembly and the vibration motor. The pressure sensor is used to sense the position of the sediment in the sampling bag. When the pressure sensor detects that the sampling bag is full of sediment, the sealing assembly is used to tighten the drawstring to close the port of the sampling bag, and the vibration motor stops vibrating.
[0007] Optionally, the sampling bag includes a main body bag made of polyethylene mesh, one end of which is sewn and sealed with a rigid PTE film layer by heat pressing, the rigid PTE film layer abutting against the pressure sensor, the other end of the main body bag is open and sewn with a drawstring made of elastic waterproof material, the drawstring is sewn to the outside of the drawstring, the drawstring is provided with two tension ends, and the sealing assembly is provided with two sets and is detachably connected to the two tension ends of the drawstring respectively.
[0008] Optionally, the sampling tube has a sealing cavity for installing a sealing assembly on its end face opposite the sampling head. A tightening hole for the rope to pass through is connected between the sealing cavity and the sampling cavity. A waterproof seal is provided between the tightening hole and the sampling cavity. The end of the tightening section near the sampling head is folded over and covers the opening of the sealing cavity. A snap-fit groove for engaging with the tightening end is provided on the end face of the sampling tube. A clamping groove for pressing the tightening section is provided on the sampling head. A sealing ring for axially inserting into the sampling tube is provided on the sampling head. The sealing ring is sleeved on the tightening section.
[0009] Optionally, the sealing element includes a sealing block, a sealing protrusion, and a sealing arc strip; The sealing block is located inside the tightening hole and has a through hole for the draw rope to pass through. The sealing protrusion is fixed to the cavity wall of the sampling chamber and is hemispherical. The sealing arc strip is sleeved and fixed on the outside of the tightening section. The sealing arc strip is made of elastic material and is engaged with the sealing protrusion. The end of the sealing arc strip facing the top cover is pressed against the cavity wall of the sampling chamber.
[0010] Optionally, the sampling bag is fitted with an L-shaped cross-section shaping skeleton at the sewn joint. The shaping skeleton is connected to the top and outer side of the sampling bag. A positioning ring is provided on the cavity wall of the sampling cavity near the top cover. A shaping ring groove is opened on the outer side of the shaping skeleton to engage with the positioning ring. When the sealing arc strip and sealing protrusion on the sampling bag are engaged, and the positioning ring is engaged with the shaping skeleton, the main body of the sampling bag is in an extended state.
[0011] Optionally, the sealing assembly includes a clamping component, a linear guide, and a flipping component; The linear guide rail is installed on the cavity wall of the sealing chamber and arranged along the axis parallel to the sampling cylinder. The clamping member includes a clamping seat connected to the slide of the linear guide rail, a first clamping plate and a second clamping plate installed on the clamping seat. The second clamping plate is located between the first clamping plate and the tightening hole. The second clamping plate slides on the clamping seat in a direction close to or away from the first clamping plate. A clamping cavity for clamping the drawstring is provided between the first clamping plate and the second clamping plate. The flipping member is connected to the second clamping plate and is used to control the second clamping plate to rotate in a direction away from the first clamping plate when the second clamping plate rises to the highest point.
[0012] Optionally, the second clamping plate is L-shaped and has a reset slider connected to its top end. The bottom end of the second clamping plate is bent toward the first clamping plate and abuts against the first clamping plate. A clamping cavity is formed between the right angle of the second clamping plate and the first clamping plate. A reset groove that is slidably connected to the reset slider is opened on the clamping seat along the arrangement direction parallel to the tightening hole. A reset spring is provided in the reset groove along the opening direction of the reset groove. The two ends of the reset spring are respectively connected to the clamping seat and the reset slider. In the initial state, the second clamping plate abuts against the first clamping plate.
[0013] Optionally, the flipping component includes a flipping gear and a flipping rack; The second clamping plate is connected to a flipping rod on the end face of the reset slider. The flipping rod is rotatably mounted on the reset slider around its own axis. The flipping rack is mounted on the second clamping plate and is coaxially arranged with the flipping rod. The flipping rack is vertically mounted on the top of the sealing cavity and is located between the first clamping plate and the second clamping plate. When the second clamping plate moves upward to its highest position, the flipping rack and flipping gear mesh and drive the second clamping plate to rotate in a direction away from the first clamping plate.
[0014] Optionally, both the first and second clamping plates are provided with elastic clamping strips at their contact points, and both the lower end faces of the first and second clamping plates are provided with chamfers at their contact points. The end face of the bent section of the second clamping plate facing the clamping cavity is a guide slope that gradually slopes upwards towards the first clamping plate.
[0015] In summary, this application includes at least one of the following beneficial technical effects of sediment sampling devices for aquatic ecological surveys: After the sampling device is placed on the surface of the sediment, the vibration motor drives the sampling head to penetrate deeper into the sediment. Sediment and water continuously enter the sampling bag. Water overflows from the outlet as sediment enters. When the sediment moves to the top of the sampling bag, it squeezes the pressure sensor. The pressure sensor is pre-set with a pressure threshold. Once the pressure of the sediment on the pressure sensor exceeds the threshold, it means that the sampling bag is full. The sealing assembly moves the clamping part upward, thereby tightening the drawstring. The tightening section tightens until the clamping part rises to its highest point. Then, the flipping part drives the second clamping plate to rotate so that the drawstring can be released from the clamping part to prevent sample leakage when the sampling device discharges water. After the sampling device discharges water, the top cover is rotated to detach from the sampling cylinder. The sampling bag is removed from the sampling cylinder from the top cover. There is no need to process the opening of the sampling bag again. This improves the existing sediment sampling devices, which suffer from sample overflow and loss, cumbersome sealing operations, and easy sample contamination. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the internal overall structure of the sampling device of this application.
[0017] Figure 2 This is an enlarged schematic diagram of part A in the embodiments of this application.
[0018] Figure 3 This is an enlarged schematic diagram of part B in the embodiments of this application.
[0019] Figure 4 This is a schematic diagram of the internal structure of the clamping seat in an embodiment of this application.
[0020] Figure 5 This is a schematic diagram of the first position of the first clamping plate and the second clamping plate in the embodiments of this application.
[0021] Figure 6 This is a schematic diagram of the second position of the first clamping plate and the second clamping plate in the embodiments of this application.
[0022] In the diagram: 1. Sampling tube; 11. Sampling chamber; 12. Outlet; 13. Sealing chamber; 14. Tightening opening; 15. Snap-fit groove; 2. Sampling head; 21. Sampling port; 22. Sealing ring; 23. Pressing groove; 3. Top cover; 4. Vibration motor; 5. Sampling bag; 51. Main bag; 52. Drawstring; 53. Tightening section; 54. Sealing arc strip; 55. Shaping skeleton; 56. Rigid PTE film layer; 57. Shaping ring groove; 6. Sealing assembly; 61. Clamping component; 6 11. Clamping seat; 612. First clamping plate; 613. Second clamping plate; 614. Clamping cavity; 615. Elastic clamping bar; 616. Reset slider; 617. Flipping rod; 618. Reset spring; 619. Reset groove; 62. Linear guide rail; 63. Flipping component; 631. Flipping gear; 632. Flipping rack; 64. Chamfer; 65. Guide slope; 7. Pressure sensor; 8. Seal; 81. Sealing protrusion; 82. Sealing block; 9. Positioning ring. Detailed Implementation
[0023] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.
[0024] This application discloses a sediment sampling device for aquatic ecological surveys. (Refer to...) Figure 1-3 It includes a sampling tube 1, a sampling bag 5, a sampling head 2, a top cover 3, a vibration motor 4, and a sealing assembly 6.
[0025] The sampling cylinder 1 contains a sampling chamber 11 for holding the sampling bag 5, and an inlet and an outlet communicating with the sampling chamber 11. The sampling head 2 is threadedly connected to the inlet of the sampling cylinder 1, and the sampling head 2 has a sampling port 21 communicating with the sampling chamber 11. The top cover 3 is threadedly connected to the outlet of the sampling cylinder 1. The vibration motor 4 is installed on the top cover 3 and has a lifting hole for connecting ropes. The side wall of the sampling cylinder 1 has a water outlet 12 communicating with the sampling chamber 11. Near the port of the sampling bag 5 facing the sampling head 2, there is a drawstring 52 for tightening the port. The sampling cylinder 1 contains a sealing assembly 6 for pulling the drawstring 52. A pressure sensor 7 is installed between the top cover 3 and the sampling bag 5, and is connected to the sealing assembly 6 and the vibration motor 4. The pressure sensor 7 is used to sense the position of the sediment inside the sampling bag 5.
[0026] The output of pressure sensor 7 is connected to the remote control system via Bluetooth. The remote control system is connected to the sealing component 6 and the vibration motor 4 via Bluetooth. Pressure sensor 7 has a preset pressure value. Once the pressure exceeds the pressure value and remains stable for a period of time, it indicates that the sample bag 5 is full of sediment. The remote control system controls the vibration motor 4 to stop vibrating, and the sealing component 6 is activated to tighten the port of the sample bag 5.
[0027] As the sampling device penetrates deeper into the sediment, sediment enters the sampling bag 5 through the sampling port 21. The amount of sediment inside the bag increases until it reaches the top, compressing the pressure sensor 7. Once the pressure sensor 7 detects that the bag is full, the sealing assembly 6 tightens the drawstring 52, sealing the end of the bag. The sampling device is then lifted out of the water using the drawstring. Because the end of the bag is tightly sealed, sample leakage is prevented. The top cover 3 is opened, and the bag is pulled out from the outlet to collect the sample. This avoids contact with the end of the bag, thus improving upon existing sediment sampling devices that suffer from sample overflow and loss, cumbersome sealing operations, and potential sample contamination.
[0028] To ensure that the sampling bag 5 remains extended after entering the sampling chamber 11 and to prevent water leakage at the connection between the drawstring 52 and the sealing assembly 6, as shown in the figure, the sampling bag 5 includes a main body bag 51 made of polyethylene mesh. One end of the main body bag 51 is sewn and sealed with a rigid PTE film layer 56 by heat pressing. The rigid PTE film layer 56 can form a flat pressure-bearing surface that abuts against the pressure sensor 7, so that the pressure sensor 7 is subjected to uniform force, and to prevent the pressure sensor 7 from being partially and falsely triggered due to protrusions at the main body bag 51.
[0029] The other end of the main bag 51 is open and sewn with a drawstring section 53 made of elastic waterproof material. A drawstring 52 is sewn to the outside of the drawstring section 53, and two tension ends are provided at the drawstring 52. The sealing assembly 6 has two sets, each detachably connected to one of the two tension ends at the drawstring 52. The material of the drawstring section 53 is preferably neoprene-coated nylon cloth or silicone composite elastic non-woven fabric to meet the requirements of water impermeability and elasticity, and to facilitate the subsequent tightening of the port of the sampling bag 5 while ensuring waterproofing. The material of the drawstring 52 is preferably silicone elastic rope to meet the needs of subsequent low-temperature sampling environment and the pulling and vibration during the sampling process.
[0030] In addition, such as Figure 1-3 As shown, the sampling tube 1 has a sealing cavity 13 on the end face opposite the sampling head 2 for installing the sealing assembly 6. A tightening hole for the drawstring 52 to pass through is connected between the sealing cavity 13 and the sampling cavity 11. A waterproof seal 8 is provided between the tightening hole and the sampling cavity 11. Since the sealing cavity 13 is located on the end face of the sampling tube 1, when installing the sampling bag 5, the sampling tube 1 and the sampling head 2 are first separated, and the drawstring 52 can be passed through the tightening hole 14 and placed in the sealing cavity 13 to connect with the sealing assembly 6, thereby speeding up the connection between the drawstring 52 and the sealing assembly 6.
[0031] To prevent water from entering the sealing cavity 13, the end of the tightening section 53 near the sampling head 2 is folded over and covers the cavity of the sealing cavity 13. A snap-fit groove 15 is provided on the end face of the sampling tube 1 for engaging with the tightening end. A pressing groove 23 is provided on the sampling head 2 for pressing the tightening section 53. A sealing ring 22 is provided on the sampling head 2 for axially engaging with the sampling tube 1. The sealing ring 22 is sleeved on the tightening section 53.
[0032] The sealing ring 22 is used to prevent external water from entering the sampling tube 1, and the sealing cavity 13 and the tightening hole are sealed by the tightening section 53 to prevent water inside the sampling tube 1 from entering the sealing cavity 13, so as to achieve a double seal for the sealing cavity 13.
[0033] In addition, the seal 8 includes a sealing block 82, a sealing protrusion 81, and a sealing arc 54.
[0034] The sealing block 82 is located inside the tightening hole and has a through hole for the drawstring 52 to pass through. The sealing protrusion 81 is fixed to the cavity wall of the sampling chamber 11 and is hemispherical. The sealing arc strip 54 is sleeved and fixed to the outside of the tightening section 53. The sealing arc strip 54 is made of elastic material and engages with the sealing protrusion 81. The end of the sealing arc strip 54 facing the top cover 3 abuts against the cavity wall of the sampling chamber 11. The engagement of the sealing arc strip 54 and the sealing protrusion 81, along with the abutting of the sealing arc strip 54 against the cavity wall of the sampling chamber 11, complicates the sealing path, increases the sealing strength, and restricts the position of the sampling bag 5 to prevent it from shaking. The sealing arc strip 54 is made of elastic material, preferably silicone.
[0035] like Figure 1-2 As shown, a shaping skeleton 55 with an L-shaped cross-section is fitted at the seam of the sampling bag 5. The shaping skeleton 55 is connected to the top and outer side of the sampling bag 5. A positioning ring 9 is provided on the cavity wall of the sampling cavity 11 near the top cover 3. A shaping ring groove 57 is provided on the outer side of the shaping skeleton 55 to engage with the positioning ring 9. The positioning ring 9 is made of elastic material, and the shaping skeleton 55 is preferably made of rigid nylon and is sewn and fixed to the main bag 51.
[0036] When the sealing arc strip 54 and sealing protrusion 81 on the sampling bag 5 are engaged, and the positioning ring 9 is engaged with the shaping skeleton 55, the main body bag 51 of the sampling bag 5 is in an extended state while limiting the position of the sampling bag 5, thus preventing the sampling bag 5 from shaking when sediment enters the sampling bag 5, and further improving the sealing stability of the sampling bag 5.
[0037] Reference Figure 3-6 The sealing assembly 6 includes a clamping component 61, a linear guide rail 62, and a flipping component 63.
[0038] The linear guide rail 62 is installed on the cavity wall of the sealing cavity 13 and is arranged along the axis parallel to the sampling cylinder 1. The clamping member 61 includes a clamping seat 611 connected to the slide of the linear guide rail 62, a first clamping plate 612 and a second clamping plate 613 installed on the clamping seat 611. The second clamping plate 613 is located between the first clamping plate 612 and the tightening hole. The second clamping plate 613 slides on the clamping seat 611 in a direction close to or away from the first clamping plate 612. A clamping cavity 614 for clamping the drawstring 52 is provided between the first clamping plate 612 and the second clamping plate 613. The flipping member 63 is connected to the second clamping plate 613 and is used to control the second clamping plate 613 to rotate in a direction away from the first clamping plate 612 when the second clamping plate 613 rises to the highest point.
[0039] To facilitate clamping the drawstring 52, the second clamping plate 613 is L-shaped and has a reset slider 616 connected to its top. The bottom end of the second clamping plate 613 is bent towards the first clamping plate 612 and abuts against it. A clamping cavity 614 is formed between the right angle of the second clamping plate 613 and the first clamping plate 612. A reset groove 619 is provided on the clamping seat 611 along the arrangement direction parallel to the tightening hole, which is slidably connected to the reset slider 616. A reset spring 618 is provided in the reset groove 619 and arranged along the opening direction of the reset groove 619. The two ends of the reset spring 618 are respectively connected to the clamping seat 611 and the reset slider 616.
[0040] When the return spring 618 is in its initial state, the second clamping plate 613 abuts against the first clamping plate 612. To facilitate the insertion of the drawstring 52 into the clamping cavity 614, the lower end faces of the first clamping plate 612 and the second clamping plate 613 are both chamfered at their contact points. The drawstring 52 is inserted between the first clamping plate 612 and the second clamping plate 613 through the chamfered point 64. The second clamping plate 613 moves away from the first clamping plate 612, creating a gap to allow the drawstring 52 to pass through the gap and enter the clamping cavity 614. Subsequently, the second clamping plate 613 abuts against the first clamping plate 612 again due to the reset of the return spring 618, thus completing the clamping of the drawstring 52. To reduce the impact during the reciprocating contact between the first clamping plate 612 and the second clamping plate 613, elastic clamping strips 615 are provided at the contact points of the first clamping plate 612 and the second clamping plate 613.
[0041] To reduce the probability of the drawstring 52 detaching from the second clamping plate 613, the end face of the curved section of the second clamping plate 613 facing the clamping cavity 614 is a guide slope 65 that gradually slopes upward in the direction closer to the first clamping plate 612. As the second clamping plate 613 rises in the direction away from the tightening hole, the drawstring 52 is tightened. Guided by the guide slope 65, the drawstring 52 presses against the curved part of the second clamping plate 613, further improving the connection strength between the drawstring 52 and the second clamping plate 613.
[0042] Additionally, the flipping component 63 includes a flipping gear 631 and a flipping rack 632.
[0043] The second clamping plate 613 is connected to the end face of the reset slider 616 with a flipping rod 617. The flipping rod 617 is mounted on the reset slider 616 and rotates around its own axis. The flipping rack 632 is mounted on the second clamping plate 613 and is coaxially arranged with the flipping rod 617. The flipping rack 632 is vertically mounted on the top of the sealing cavity 13 and is located between the first clamping plate 612 and the second clamping plate 613.
[0044] When the second clamping plate 613 moves upward to its highest position, the flipping rack 632 and the flipping gear 631 mesh and drive the second clamping plate 613 to rotate in a direction away from the first clamping plate 612. When the second clamping plate 613 rotates to more than 90 degrees, the draw rope 52 disengages from the second clamping plate 613, so that the draw rope 52 can move together when the sampling bag 5 is pulled out from the outlet, simplifying the steps of removing the sampling bag 5.
[0045] The implementation principle of a sediment sampling device for aquatic ecological survey according to an embodiment of this application is as follows: When assembling the sampling device, first insert the sampling bag 5 into the outlet of the sampling cylinder 1 until the positioning ring 9 and the shaping frame 55 are engaged, and the sealing arc strip 54 and the sealing protrusion 81 are engaged. Then, insert the end of the draw rope 52 into the clamping cavity 614 and connect it with the second clamping plate 613. Cover the sealing cavity 13 at the tightening section 53. Then, the sampling head 2 is sealed to the sampling cylinder 1, the cover is sealed to the sampling cylinder 1, and the rope is connected to the lifting ring at the vibration motor 4 in preparation for water entry. After the sampling device enters the water and sinks to the sediment position, the vibration motor 4 is turned on, the sampling head 2 sinks, and the sediment enters the sampling bag 5 through the sampling hole. As the sediment continues to enter the sampling bag 5, when the sediment pushes the rigid PTE film layer 56 to continuously press against the pressure sensor 7, the pressure sensor 7 senses that the bag is full of sediment. The remote control system controls the vibration motor 4 to stop vibrating. At the same time, the linear guide rail 62 starts to drive the clamping part 61 to rise, and the draw rope 52 tightens the binding section 53 to achieve the binding of the sampling bag 5. After the water is discharged from the sampling device, the top cover 3, sampling cylinder 1 and sampling head 2 are separated. The sampling bag 5 is pulled out from the discharge port of the sampling cylinder 1 and a new sampling bag 5 is put into the sampling cylinder 1. The whole process does not require further processing of the opening of the sampling bag 5, which improves the existing sediment sampling device's problems of sample overflow and loss, cumbersome sealing operation and easy sample contamination.
[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A sediment sampling device for aquatic ecological survey, characterized in that, It includes a sampling tube (1), a sampling bag (5), a sampling head (2), a top cover (3), a vibration motor (4), and a sealing assembly (6); The sampling cylinder (1) is provided with a sampling chamber (11) for placing the sampling bag (5) and an inlet and an outlet connected to the sampling chamber (11). The sampling head (2) is threadedly connected to the inlet of the sampling cylinder (1). The top cover (3) is threadedly connected to the outlet of the sampling cylinder (1). The vibration motor (4) is installed on the top cover (3). The side wall of the sampling cylinder (1) is provided with a water outlet (12) connected to the sampling chamber (11). The sampling bag (5) is provided with a drawstring (52) for tightening the port near the port of the sampling head (2). The sampling cylinder (1) is provided with a sealing assembly (6) for pulling the drawstring (52). A pressure sensor (7) connected to the sealing assembly (6) and the vibration motor (4) is provided between the top cover (3) and the sampling bag (5). The pressure sensor (7) is used to sense the position of the sediment in the sampling bag (5). When the pressure sensor (7) senses that the sampling bag (5) is full of sediment, the sealing assembly (6) is used to tighten the drawstring (52) to tighten the port of the sampling bag (5), and the vibration motor (4) stops vibrating.
2. The sediment sampling device for aquatic ecological survey according to claim 1, characterized in that: The sampling bag (5) includes a main body bag (51) made of polyethylene mesh. One end of the main body bag (51) is sewn and sealed with a rigid PTE film layer (56) by heat pressing. The rigid PTE film layer (56) abuts against the pressure sensor (7). The other end of the main body bag (51) is open and sewn with a drawstring section (53) of elastic waterproof material. The drawstring (52) is sewn to the outside of the drawstring section (53). Two tension ends are provided at the drawstring (52). The sealing assembly (6) is provided with two sets and is detachably connected to the two tension ends at the drawstring (52).
3. The sediment sampling device for aquatic ecological survey according to claim 2, characterized in that: The sampling tube (1) has a sealing cavity (13) for installing the sealing assembly (6) on the end face facing the sampling head (2). A tightening hole for the draw rope (52) to pass through is connected between the sealing cavity (13) and the sampling cavity (11). A waterproof seal (8) is provided between the tightening hole and the sampling cavity (11). The end of the tightening section (53) near the sampling head (2) is folded over and covers the cavity of the sealing cavity (13). A snap-fit groove (15) for engaging with the tightening end is provided on the end face of the sampling tube (1). A pressing groove (23) for pressing the tightening section (53) is provided on the sampling head (2). A sealing ring (22) for axially engaging with the sampling tube (1) is provided on the sampling head (2). The sealing ring (22) is sleeved on the tightening section (53).
4. The sediment sampling device for aquatic ecological survey according to claim 3, characterized in that: The sealing element (8) includes a sealing block (82), a sealing protrusion (81), and a sealing arc strip (54). The sealing block (82) is located inside the tightening hole and has a through hole for the draw rope (52) to pass through. The sealing protrusion (81) is fixed to the cavity wall of the sampling chamber (11) and is hemispherical. The sealing arc strip (54) is sleeved and fixed to the outside of the tightening section (53). The sealing arc strip (54) is made of elastic material and is engaged with the sealing protrusion (81). The end of the sealing arc strip (54) facing the top cover (3) is pressed against the cavity wall of the sampling chamber (11).
5. A sediment sampling device for aquatic ecological survey according to claim 4, characterized in that: The sampling bag (5) is fitted with a shaping skeleton (55) with an L-shaped cross section at the sewn joint. The shaping skeleton (55) is connected to the top and outer side of the sampling bag (5). A positioning ring (9) is provided on the cavity wall of the sampling cavity (11) near the top cover (3). A shaping ring groove (57) is opened on the outer side of the shaping skeleton (55) to engage with the positioning ring (9). When the sealing arc strip (54) and sealing protrusion (81) on the sampling bag (5) are engaged, and the positioning ring (9) is engaged with the shaping skeleton (55), the main body bag (51) of the sampling bag (5) is in an extended state.
6. A sediment sampling device for aquatic ecological survey according to claim 2, characterized in that: The sealing assembly (6) includes a clamping member (61), a linear guide rail (62), and a flipping member (63). The linear guide rail (62) is installed on the cavity wall of the sealing cavity (13) and arranged along the axis parallel to the sampling cylinder (1). The clamping member (61) includes a clamping seat (611) connected to the slide of the linear guide rail (62), a first clamping plate (612) and a second clamping plate (613) installed on the clamping seat (611). The second clamping plate (613) is located between the first clamping plate (612) and the tightening hole. The second clamping plate (613) slides on the clamping seat (611) in a direction close to or away from the first clamping plate (612). A clamping cavity (614) for clamping the drawstring (52) is provided between the first clamping plate (612) and the second clamping plate (613). The flipping member (63) is connected to the second clamping plate (613) and is used to control the second clamping plate (613) to rotate in a direction away from the first clamping plate (612) when the second clamping plate (613) rises to the highest point.
7. A sediment sampling device for aquatic ecological survey according to claim 6, characterized in that: The second clamping plate (613) is L-shaped and has a reset slider (616) connected to its top end. The bottom end of the second clamping plate (613) is bent toward the first clamping plate (612) and abuts against the first clamping plate (612). A clamping cavity (614) is formed between the right angle of the second clamping plate (613) and the first clamping plate (612). A reset groove (619) that is slidably connected to the reset slider (616) is provided on the clamping seat (611) along the arrangement direction parallel to the tightening hole. A reset spring (618) is provided in the reset groove (619) along the opening direction of the reset groove (619). The two ends of the reset spring (618) are respectively connected to the clamping seat (611) and the reset slider (616). In the initial state, the second clamping plate (613) abuts against the first clamping plate (612).
8. A sediment sampling device for aquatic ecological survey according to claim 7, characterized in that: The flipping component (63) includes a flipping gear (631) and a flipping rack (632). The second clamping plate (613) is connected to the end face of the reset slider (616) with a flipping rod (617). The flipping rod (617) is mounted on the reset slider (616) around its own axis. The flipping rack (632) is mounted on the second clamping plate (613) and is coaxially arranged with the flipping rod (617). The flipping rack (632) is vertically mounted on the top of the sealing cavity (13) and located between the first clamping plate (612) and the second clamping plate (613). When the second clamping plate (613) moves upward to its highest position, the flipping rack (632) and the flipping gear (631) mesh together and drive the second clamping plate (613) to rotate in a direction away from the first clamping plate (612).
9. A sediment sampling device for aquatic ecological survey according to claim 7, characterized in that: Both the first clamping plate (612) and the second clamping plate (613) are provided with elastic clamping strips (615) at their contact points. Both the lower end faces of the first clamping plate (612) and the second clamping plate (613) are provided with chamfers (64) at their contact points. The end face of the curved section of the second clamping plate (613) facing the clamping cavity (614) is a guide slope (65) that gradually slopes upward toward the first clamping plate (612).