Small ship ballast water sampler and sampling method

Abstract

The invention discloses a small ship ballast water sampler and a sampling method, and belongs to the technical field of ballast tank seawater sampling, the small ship ballast water sampler comprises a main collecting pipe and a plurality of auxiliary collecting pipes, the auxiliary collecting pipes are communicated with a collecting tank, and the outer ring of the main collecting pipe is provided with a water inlet and a locking structure; a sealing plate structure capable of sliding on the inner wall and sealing a through hole leading to the auxiliary collecting pipe and a water inlet is arranged in the main collecting pipe, a gear is rotationally installed on a connecting table fixed to the top of the main collecting pipe, floating boxes are fixedly connected to the two sides of the connecting table, and the gear drives a transmission rack so that water in the floating boxes can flow in and out. The top of the floating box communicates with a hollow pipe with a handle, a clamping device is assembled on the surface of the gear, a sliding rod is fixedly installed on a connecting piece rotationally connected with the bottom of the rotating rod, an unlocking structure is arranged at the bottom of the sliding rod, and a sediment collecting pipe is installed at the bottom of the main collecting pipe. The device can integrate multifunctional sampling capacity and collect ballast water at different depths.

Description

Technical Field

[0001] The invention relates to the technical field of ballast tank seawater sampling, and in particular to a small ship ballast water sampler and a sampling method. Background Art

[0002] As an important factor in maintaining stability and ensuring safety during ship navigation, the management and monitoring of ballast water has always attracted much attention. Among them, ballast water sampling is a key step in evaluating the quality of ballast water and detecting whether it meets the emission standards.

[0003] Existing fixed sampling equipment is usually fixedly installed in the ballast water tank of the ship, and sampling is achieved through preset pipes and valves. This type of equipment can easily extract water samples from different depths of the ballast water tank, but due to the complicated equipment installation process, its installation cost on small ships is high and its flexibility is insufficient. On the other hand, some portable sampling equipment is mainly composed of manual or electric pumps, sampling tubes and sample collection devices. The operator needs to insert the sampling tube into the ballast water tank and extract water samples through the water pump. This type of equipment has a certain degree of portability, but its operation steps are cumbersome and its functions are relatively single.

[0004] In ballast water tanks, due to the long-term storage of ballast water, stratification often occurs in the materials in the tanks, especially dense particles and suspended matter are easy to settle and accumulate on the bottom of the tank. These sediments are not only important carriers of environmental pollution, but also potential risks of biological invasion. By sampling and analyzing the sediments on the bottom of the tank, the quality of ballast water and its ecological safety can be more comprehensively monitored and evaluated. While sampling the ballast water, how to achieve efficient sampling of sediment samples deposited on the bottom of the tank is still a technical problem that is difficult to overcome in the current industry. Summary of the invention

[0005] The purpose of the present invention is to solve the problem in the prior art that due to long-term storage of ballast water, stratification of materials in the cabin often occurs, especially that particles and suspended matter with higher density are easy to settle and accumulate at the bottom of the cabin. A ship ballast water sampler and sampling method are proposed, which can integrate multi-functional sampling capabilities and collect ballast water at different depths.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a small ship ballast water sampler, comprising a main collection tube and a plurality of auxiliary collection tubes connected to the main collection tube, the auxiliary collection tubes are connected to a collection tank, the outer ring of the main collection tube is provided with a plurality of water inlets and a locking structure, the main collection tube is provided with a sealing plate structure that can slide on the inner wall and seal the through hole and the water inlet leading to the auxiliary collection tube, and a gear is rotatably installed on a connecting platform fixed on the top of the main collection tube;

[0007] The two sides of the connecting platform are fixedly connected with floating boxes, and the transmission rack is driven by the gear to allow the water inside the floating box to enter and exit. The top of the floating box is connected with a hollow tube with a handle. The surface of the gear is equipped with a clamping device for clamping the rotating rod. The connecting piece rotatably connected at the bottom of the rotating rod is fixedly installed with a sliding rod that passes through the connecting platform, and the bottom of the sliding rod is provided with an unlocking structure;

[0008] During the up and down movement, the unlocking structure can drive the sealing plate structure to move up and down, and cooperate with the locking structure to release or restore the sealing function. A sediment collection tube is installed at the bottom of the main collection tube.

[0009] As a further description of the above technical solution: the sealing plate structure includes a plurality of slide rails arranged on the inner wall of the main collection tube and baffles slidably connected to these slide rails, the unlocking structure includes a mounting plate fixedly connected to the sliding rod and a moving block sliding on the surface of the mounting plate, and the locking structure includes a locking shell fixedly installed on the outer wall of the main collection tube.

[0010] As a further description of the above technical solution: the mounting plate is slidably connected to the inner wall of the main collecting tube, and the surface of the mounting plate is provided with fan-shaped holes.

[0011] As a further description of the above technical solution: a socket is arranged on the surface of the baffle, and inclined surfaces with the same angle are arranged on the upper and lower sides of the baffle and the socket and the upper and lower sides of the moving block, and a locking rod is slidably connected inside the locking shell, which penetrates the locking shell and the main collection tube and extends to the socket.

[0012] As a further description of the above technical solution: a first return spring is sleeved on the outer ring of the locking rod, and two ends of the first return spring are respectively fixedly connected to the locking rod and the inner cavity wall of the locking shell.

[0013] As a further description of the above technical solution: at least four rectangular plates are fixedly installed on the top of the mounting plate, a moving rod penetrating the rectangular plates is fixedly connected to the moving block, and a second return spring fixed to the rectangular plates and the moving block is sleeved on the outer side of the moving rod.

[0014] As a further description of the above technical solution: a water outlet pipe is provided on the outer wall of the floating box, a piston plate is provided in the inner cavity of the floating box, a piston rod is fixed to the piston plate which penetrates the floating box and is fixedly connected to the rack, and the gear and the transmission rack are meshed with each other.

[0015] As a further description of the above technical solution: the clamping device includes a support column fixedly mounted on the gear, a positioning rod is threaded through the support column, the positioning rod is rotatably connected to a rotating column, a limit bar is provided on the outer ring of the rotating rod, and the rotating column is fixedly connected to a U-shaped plate that is slidably connected to the limit bar.

[0016] A sampling method for a small ship ballast water sampler comprises the following steps:

[0017] S1: Install several collection tanks on the auxiliary collection tube, and completely immerse the main collection tube and the auxiliary collection tube into the ballast water, so that the floating box floats on the ballast water surface, and install the connector at the bottom of the rotating rod to the sliding rod through bolts, and fix the hollow tube on the floating box, and assemble a handle on the hollow tube. Then, rotate the positioning rod to adjust the distance between the U-shaped plate and the outer ring of the rotating rod, so that the limit bar can slide smoothly along the groove of the U-shaped plate;

[0018] S2: Quickly insert the rotating rod into the main collection tube, and drive the rotating rod to move the unlocking structure at the bottom of the sliding rod downward. When the inclined surface of the moving block on the mounting plate contacts the inclined surface on one side of the baffle, the moving block slides to the side away from the baffle and abuts against the surface of the baffle. When the moving block slides to the insertion hole position, the moving block is inserted into the insertion hole, so that the locking rod is disengaged from the insertion hole.

[0019] S3: As the moving block drives the baffle to move downward by inserting into the socket, when it moves to the bottom of the slide rail, the baffle cannot move further downward, and the moving block is disengaged from the socket, and another locking rod is immediately inserted into the socket. In this state, the baffle is fixed in the unsealed position, and the ballast water enters the main collection pipe through the water inlet, then flows into the auxiliary collection pipe, and finally enters the collection tank;

[0020] S4: After the collection is completed, the unlocking structure is driven to move upward by pulling out the rotating rod, and then, the baffle is pushed upward to the sealing state by the moving block according to the method of fixing the baffle in the unsealed state, and then, after the moving block is moved away, the locking rod is inserted into the insertion hole to complete the operation, so as to seal the through hole and the water inlet leading to the auxiliary collection pipe;

[0021] S5: Turn the rotating rod to rotate the gear, thereby driving the transmission rack to move. The transmission rack further drives the piston plate to move toward the main collection tube through the piston rod. At the same time, the air in the floating box is discharged through the hollow tube. In this process, the floating box, the main collection tube and the sediment collection tube are synchronously moved downward through the handle and the hollow tube, thereby completing the collection of sediment samples at the bottom of the cabin;

[0022] S6: After the collection is completed, the piston plate is moved away from the main collection tube by rotating the gear, thereby discharging the ballast water in the floating box, and the air enters the floating box through the hollow tube. The buoyancy generated by the floating box is used to take out the main collection tube and the sediment collection tube.

[0023] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0024] 1. Place the main collection tube and the auxiliary collection tube into the ballast water, and float on the water surface with the help of the air in the floating box. The design of the floating box improves the stability of the equipment, facilitates the staff to quickly install the hollow tube and rotating rod and other components, improves the convenience and work efficiency of operation, and when collecting sediments, the main collection tube can be used as an extension of the sediment collection tube, allowing the sediment collection tube to sink to a deeper depth to collect sediments at the bottom.

[0025] 2. The unlocking structure is linked to the sealing plate structure. By manually moving the rotating rod up and down, the unlocking structure can be driven to release or restore the sealing state of the sealing plate structure without the need for an external power source. This design not only reduces the complexity of the equipment, but also reduces energy consumption and is suitable for a variety of usage environments.

[0026] 3. The main collection tube works with multiple auxiliary collection tubes. The main collection tube is used for overall sampling, while the auxiliary collection tubes and collection tanks can collect ballast water at different depths at the same location. Water samples at the same depth are collected by at least two auxiliary collection tubes and collection tanks, which ensures the reliability of sampling and facilitates comparison during subsequent testing.

[0027] 4. A sediment collection tube is provided at the bottom of the main collection tube. Through gears and racks, the air in the floating box is discharged and ballast water is introduced to realize the sinking of the sediment collection tube and sample collection. After the collection is completed, the floating box is floated to the surface by re-injecting air to assist in the removal of the sediment collection tube. This function effectively expands the application range of the equipment, so that it can not only collect ballast water, but also efficiently collect bottom sediments to meet diverse sampling needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A front view of the present invention is shown;

[0029] Figure 2 A perspective view of the present invention is shown;

[0030] Figure 3 The present invention is shown Figure 2 The enlarged view of point A in the middle;

[0031] Figure 4 A cross-sectional view of the present invention is shown;

[0032] Figure 5 The present invention is shown Figure 4 The enlarged view of point B in the middle;

[0033] Figure 6 The present invention is shown Figure 4 Enlarged view of point C in the middle;

[0034] Figure 7 A cross-sectional view of a flotation tank of the present invention is shown;

[0035] Figure 8 A cross-sectional view of the main collecting tube of the present invention is shown;

[0036] Fig. 9 A perspective view of the sliding rod and the unlocking structure of the present invention is shown;

[0037] Fig.10 A perspective view of a baffle according to the present invention is shown.

[0038] Legend:

[0039] 10. Main collection pipe; 101. Water inlet; 11. Auxiliary collection pipe; 12. Collection tank; 13. Connecting platform; 14. Gear; 15. Rotating rod; 151. Limiting bar; 16. Connecting piece; 17. Sliding rod; 18. Sediment collection pipe;

[0040] 20. Locking structure; 21. Locking housing; 22. Locking rod; 23. First return spring;

[0041] 30. Sealing plate structure; 31. Slide rail; 32. Baffle; 33. Socket;

[0042] 40. floating box; 41. rack; 42. handle; 43. hollow tube; 44. water outlet pipe; 45. piston plate; 46. piston rod;

[0043] 50. Clamping device; 51. Support column; 52. Positioning rod; 53. Rotating column; 54. U-shaped plate;

[0044] 60. Unlocking structure; 61. Mounting plate; 611. Fan-shaped hole; 62. Moving block; 63. Rectangular plate; 64. Moving rod; 65. Second return spring. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] See also Figure 1-Figure 10 This embodiment provides a small ship ballast water sampler, including a main collection pipe 10 and a plurality of auxiliary collection pipes 11 connected to the main collection pipe 10, and the auxiliary collection pipes 11 are connected to a collection tank 12.

[0047] The main collection tube 10 serves as a core sampling component and provides an overall sampling function, ensuring that the equipment can quickly and comprehensively obtain ballast water samples, realize rapid collection of overall ballast water samples, and meet the needs of efficient detection.

[0048] The auxiliary collection tube 11 and the collection tank 12 can collect water samples at different depths respectively, and at least two auxiliary collection tubes 11 are equipped at each depth to ensure the reliability of the samples and facilitate sample comparison and result verification.

[0049] The outer ring of the main collection tube 10 is provided with a plurality of water inlets 101 and a locking structure 20. The inside of the main collection tube 10 is provided with a sealing plate structure 30 which can slide on the inner wall and seal the through hole leading to the auxiliary collection tube 11 and the water inlet 101. A gear 14 is rotatably mounted on the connecting platform 13 fixed on the top of the main collection tube 10.

[0050] The two sides of the connecting platform 13 are fixedly connected with a floating box 40, and the gear 14 drives the transmission rack 41 to allow the floating box 40 to realize the inflow and outflow of the internal water. The top of the floating box 40 is connected with a hollow tube 43 with a handle 42. The surface of the gear 14 is equipped with a clamping device 50 for clamping the rotating rod 15. The connecting piece 16 rotatably connected to the bottom of the rotating rod 15 is fixedly installed with a sliding rod 17 that passes through the connecting platform 13, and the bottom of the sliding rod 17 is provided with an unlocking structure 60;

[0051] During the process of moving up and down, the unlocking structure 60 can drive the sealing plate structure 30 to move up and down, and cooperate with the locking structure 20 to release or restore the sealing function.

[0052] A sediment collection tube 18 is installed at the bottom of the main collection tube 10. The sediment collection tube 18 can be used to collect sediment at the bottom of the ballast water tank to expand the sampling range. When the sediment collection tube 18 is working, the main collection tube 10 can serve as an extension of the sediment collection tube 18, allowing the sediment collection tube 18 to sink to a deeper level to collect sediment at the bottom.

[0053] Furthermore, the unlocking structure 60 includes a mounting plate 61 fixedly connected to the sliding rod 17 and a moving block 62 sliding on the surface of the mounting plate 61, the mounting plate 61 is slidably connected to the inner wall of the main collection tube 10, the mounting plate 61 has fan-shaped holes 611 on the surface of the mounting plate 61, at least four rectangular plates 63 are fixedly installed on the top of the mounting plate 61, a moving rod 64 passing through the rectangular plate 63 is fixedly connected to the moving block 62, and a second return spring 65 fixed to the rectangular plate 63 and the moving block 62 is sleeved on the outer side of the moving rod 64.

[0054] Furthermore, the sealing plate structure 30 includes a plurality of slide rails 31 arranged on the inner wall of the main collection tube 10 and a baffle 32 slidably connected to these slide rails 31, a plug hole 33 is arranged on the surface of the baffle 32, and the baffle 32 and the upper and lower sides of the plug hole 33 and the upper and lower sides of the moving block 62 are all provided with inclined surfaces with the same angle.

[0055] Furthermore, the locking structure 20 includes a locking shell 21 fixedly mounted on the outer wall of the main collection tube 10, and the interior of the locking shell 21 is slidably connected with a locking rod 22 that penetrates the locking shell 21 and the main collection tube 10 and extends to the insertion hole 33. A first return spring 23 is sleeved on the outer ring of the locking rod 22, and both ends of the first return spring 23 are fixedly connected to the locking rod 22 and the inner cavity wall of the locking shell 21, respectively.

[0056] The unlocking structure 60 is linked with the sealing plate structure 30. By manually moving the rotating rod 15 up and down, the unlocking structure 60 can be driven to release or restore the sealing state of the sealing plate structure 30 without the need for an external power source. This design not only reduces the complexity of the equipment, but also reduces energy consumption, and is suitable for a variety of usage environments.

[0057] Furthermore, a water outlet pipe 44 is provided on the outer wall of the floating box 40, and a piston plate 45 is provided in the inner cavity of the floating box 40. The piston plate 45 is fixed with a piston rod 46 that penetrates the floating box 40 and is fixedly connected to the rack 41. The gear 14 and the transmission rack 41 are meshed with each other.

[0058] The floating box 40 allows the sampler to float on the water surface, which is convenient for the installation of subsequent components. The gear 14 drives the transmission rack 41 to control the discharge and injection of water and air inside the floating box 40, which is convenient for the sinking and removal of the sediment collection tube 18. After the sediment collection is completed, the floating box 40 is floated to the surface by re-injecting air to assist in the removal of the sediment collection tube 18. This function effectively expands the application range of the equipment, allowing it to not only collect ballast water, but also efficiently collect bottom sediments to meet diverse sampling needs.

[0059] Furthermore, the clamping device 50 includes a support column 51 fixedly mounted on the gear 14, a positioning rod 52 is threadedly passed through the support column 51, the positioning rod 52 is rotatably connected to a rotating column 53, the outer ring of the rotating rod 15 is provided with a limit bar 151, and the rotating column 53 is fixedly connected to a U-shaped plate 54 that is slidably connected to the limit bar 151.

[0060] The clamping device 50 allows the rotating rod 15 to drive the gear 14 to rotate while moving up and down, thereby meeting the needs of multi-functional sampling operations. The sliding connection between the U-shaped plate 54 and the limit bar 151 ensures that the rotating rod 15 will not separate from the clamping device 50 during operation, avoiding safety hazards caused by accidental separation of equipment components.

[0061] The process of sampling using the sampler of the present invention comprises the following steps:

[0062] S1: Install several collection tanks 12 on the auxiliary collection tube 11, and completely immerse the main collection tube 10 and the auxiliary collection tube 11 into the ballast water, so that the floating box 40 floats on the ballast water surface, and install the connector 16 at the bottom of the rotating rod 15 to the sliding rod 17 by bolts, and fix the hollow tube 43 on the floating box 40, and assemble the handle 42 on the hollow tube 43, then rotate the positioning rod 52, adjust the distance between the U-shaped plate 54 and the outer ring of the rotating rod 15, so that the limit bar 151 can slide smoothly along the groove of the U-shaped plate 54;

[0063] S2: Quickly insert the rotating rod 15 into the main collection tube 10. The unlocking structure 60 at the bottom of the sliding rod 17 moves downward by the driving of the rotating rod 15. When the inclined surface of the moving block 62 on the mounting plate 61 contacts the inclined surface of one side of the baffle 32, the moving block 62 slides to the side away from the baffle 32 and abuts against the surface of the baffle 32. When the moving block 62 slides to the position of the insertion hole 33, the moving block 62 is inserted into the insertion hole 33, so that the locking rod 22 is disengaged from the insertion hole 33.

[0064] S3: Since the moving block 62 drives the baffle 32 to move downward by inserting into the socket 33, when it moves to the bottom of the slide rail 31, the baffle 32 cannot move further downward, and the moving block 62 is disengaged from the socket 33, and the other locking rod 22 is immediately inserted into the socket 33. In this state, the baffle 32 is fixed in the unsealed position, and the ballast water enters the main collection pipe 10 through the water inlet 101, then flows into the auxiliary collection pipe 11, and finally enters the collection tank 12;

[0065] S4: After the collection is completed, the unlocking structure 60 is driven to move upward by pulling out the rotating rod 15, and then, according to the method of fixing the baffle 32 in the unsealed state, the baffle 32 is pushed to move upward to the sealed state by the moving block 62. Subsequently, after the moving block 62 is moved away, the locking rod 22 is inserted into the insertion hole 33 to complete the operation, so as to seal the through hole leading to the auxiliary collection pipe 11 and the water inlet 101;

[0066] S5: Rotate the rotating rod 15 to rotate the gear 14, thereby driving the transmission rack 41 to move, and the transmission rack 41 further drives the piston plate 45 to move toward the main collection tube 10 through the piston rod 46. At the same time, the air in the floating box 40 is discharged through the hollow tube 43. In this process, the floating box 40, the main collection tube 10 and the sediment collection tube 18 are synchronously moved downward through the handle 42 and the hollow tube 43, thereby completing the collection of sediment samples at the bottom of the cabin;

[0067] S6: After the collection is completed, the piston plate 45 is moved away from the main collection tube 10 by rotating the gear 14, thereby discharging the ballast water in the floating box 40, and the air enters the floating box 40 through the hollow tube 43. The buoyancy generated by the floating box 40 is used to take out the main collection tube 10 and the sediment collection tube 18.

[0068] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A small ship ballast water sampler, comprising a main collection tube (10) and a plurality of auxiliary collection tubes (11) connected to the main collection tube (10), characterized in that: The auxiliary collection pipe (11) is connected to a collection tank (12); the outer ring of the main collection pipe (10) is provided with a plurality of water inlets (101) and a locking structure (20); the main collection pipe (10) is provided with a sealing plate structure (30) that can slide on the inner wall and seal the through hole leading to the auxiliary collection pipe (11) and the water inlet (101); a gear (14) is rotatably mounted on a connecting platform (13) fixed on the top of the main collection pipe (10); The two sides of the connecting platform (13) are fixedly connected with a floating box (40), and the gear (14) drives the transmission rack (41) to realize the entry and exit of water inside the floating box (40). The top of the floating box (40) is connected with a hollow tube (43) with a handle (42). The surface of the gear (14) is equipped with a clamping device (50) for clamping a rotating rod (15). The bottom of the rotating rod (15) is rotatably connected with a connecting piece (16). A sliding rod (17) that passes through the connecting platform (13) is fixedly installed on the connecting piece (16), and an unlocking structure (60) is provided at the bottom of the sliding rod (17); During the process of moving up and down, the unlocking structure (60) can drive the sealing plate structure (30) to move up and down, and cooperate with the locking structure (20) to release or restore the sealing function. A sediment collection tube (18) is installed at the bottom of the main collection tube (10).

2. A small ship ballast water sampler according to claim 1, characterized in that: The sealing plate structure (30) comprises a plurality of slide rails (31) arranged on the inner wall of the main collection tube (10) and baffles (32) slidably connected to the slide rails (31); the unlocking structure (60) comprises a mounting plate (61) fixedly connected to the sliding rod (17) and a moving block (62) sliding on the surface of the mounting plate (61); and the locking structure (20) comprises a locking shell (21) fixedly mounted on the outer wall of the main collection tube (10).

3. A small ship ballast water sampler according to claim 2, characterized in that: The mounting plate (61) is slidably connected to the inner wall of the main collecting tube (10), and the surface of the mounting plate (61) is provided with fan-shaped holes (611).

4. A small ship ballast water sampler according to claim 2, characterized in that: The surface of the baffle plate (32) is provided with an insertion hole (33), and the upper and lower sides of the baffle plate (32) and the insertion hole (33) and the upper and lower sides of the moving block (62) are all provided with inclined surfaces with the same angle, and the interior of the locking shell (21) is slidably connected with a locking rod (22) that penetrates the locking shell (21) and the main collection tube (10) and extends to the insertion hole (33).

5. A small ship ballast water sampler according to claim 4, characterized in that: A first return spring (23) is sleeved on the outer ring of the locking rod (22), and two ends of the first return spring (23) are respectively fixedly connected to the locking rod (22) and the inner cavity wall of the locking shell (21).

6. A small ship ballast water sampler according to claim 2, characterized in that: At least four rectangular plates (63) are fixedly mounted on the top of the mounting plate (61); a moving rod (64) penetrating the rectangular plates (63) is fixedly connected to the moving block (62); and a second return spring (65) fixed to the rectangular plates (63) and the moving block (62) is sleeved on the outer side of the moving rod (64).

7. A small ship ballast water sampler according to claim 1, characterized in that: The outer wall of the floating box (40) is provided with a water outlet pipe (44), the inner cavity of the floating box (40) is provided with a piston plate (45), the piston plate (45) is fixed with a piston rod (46) that penetrates the floating box (40) and is fixedly connected to the rack (41), and the gear (14) and the transmission rack (41) are meshed with each other.

8. A small ship ballast water sampler according to claim 1, characterized in that: The clamping device (50) comprises a support column (51) fixedly mounted on the gear (14); a positioning rod (52) is threadedly penetrated through the support column (51); the positioning rod (52) is rotatably connected to a rotating column (53); a limiting strip (151) is provided on the outer ring of the rotating rod (15); and the rotating column (53) is fixedly connected to a U-shaped plate (54) slidably connected to the limiting strip (151).

9. A sampling method for a small ship ballast water sampler, characterized in that: The following steps are involved: S1: A plurality of collection tanks (12) are installed on the auxiliary collection tube (11), and the main collection tube (10) and the auxiliary collection tube (11) are completely immersed in ballast water, so that the floating box (40) floats on the surface of the ballast water, and the connecting piece (16) at the bottom of the rotating rod (15) is installed on the sliding rod (17) by bolts, and the hollow tube (43) is fixed on the floating box (40), and the handle (42) is assembled on the hollow tube (43), and then the positioning rod (52) is rotated to adjust the distance between the U-shaped plate (54) and the outer ring of the rotating rod (15), so that the limit bar (151) can slide smoothly along the groove of the U-shaped plate (54); S2: quickly insert the rotating rod (15) into the main collection tube (10), and drive the rotating rod (15) to move the unlocking structure (60) at the bottom of the sliding rod (17) downward. When the inclined surface of the moving block (62) on the mounting plate (61) contacts the inclined surface of one side of the baffle (32), the moving block (62) slides to the side away from the baffle (32) and abuts against the surface of the baffle (32). When the moving block (62) slides to the position of the insertion hole (33), the moving block (62) is inserted into the insertion hole (33), so that the locking rod (22) is disengaged from the insertion hole (33); S3: As the moving block (62) drives the baffle (32) to move downward by inserting into the insertion hole (33), when the baffle (32) moves to the bottom of the slide rail (31), the baffle (32) cannot move further downward, and the moving block (62) is disengaged from the insertion hole (33), and another locking rod (22) is then inserted into the insertion hole (33). In this state, the baffle (32) is fixed in the unsealed position, and the ballast water enters the main collection pipe (10) through the water inlet (101), then flows into the auxiliary collection pipe (11), and finally enters the collection tank (12); S4: After the collection is completed, the unlocking structure (60) is driven upward by pulling out the rotating rod (15), and then, according to the method of fixing the baffle plate (32) in the unsealed state, the baffle plate (32) is pushed upward to the sealed state position by the moving block (62). Then, after the moving block (62) is moved away, the locking rod (22) is inserted into the insertion hole (33) to complete the operation, so as to seal the through hole leading to the auxiliary collection pipe (11) and the water inlet (101); S5: The rotating rod (15) is rotated to rotate the gear (14), thereby driving the transmission rack (41) to move. The transmission rack (41) further drives the piston plate (45) to move toward the main collection tube (10) through the piston rod (46). At the same time, the air in the floating box (40) is discharged through the hollow tube (43). In this process, the floating box (40), the main collection tube (10) and the sediment collection tube (18) are synchronously moved downward through the handle (42) and the hollow tube (43), thereby completing the collection of sediment samples at the bottom of the cabin; S6: After the collection is completed, the piston plate (45) is moved away from the main collection tube (10) by rotating the gear (14), thereby discharging the ballast water in the floating box (40), and the air enters the floating box (40) through the hollow tube (43). The buoyancy generated by the floating box (40) is used to remove the main collection tube (10) and the sediment collection tube (18).

Images