Sampling device for aquaculture and use method thereof

Abstract

The invention relates to the technical field of sampling devices, and discloses a sampling device for aquaculture and a use method thereof.The sampling device comprises a positioning rod, the surface of the positioning rod is slidably sleeved with an upper sealing cover, a lower sealing cover and a sampling barrel, a plurality of sample storage cavities are formed in the sampling barrel, and a piston mechanism for sampling is arranged in each sample storage cavity; a plurality of liquid inlets communicated with the sample storage cavity are formed in the bottom of the sampling cylinder, and a filter plate is fixedly mounted in each liquid inlet. The sampling cylinder is arranged, the multiple sample storage cavities are formed in the sampling cylinder, the sampling cylinder can sink to different depths in the same water area for sampling, collection of multiple samples at different depths can be completed through one-time water entering, the filter plate can be cleaned in the sampling process through the arrangement of the slag removal mechanism, the situation that a liquid inlet is blocked by large impurities in water is avoided, and the sampling efficiency is improved. The smoothness of the sampling process of the equipment is improved, and the working efficiency of sampling is higher.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling devices, and in particular to a sampling device for aquaculture and a method of using the same. Background Art

[0002] Aquaculture refers to the production activities of cultivating, raising and harvesting various aquatic plants and animals in water bodies by artificial means. This farming method is widely used in fisheries and aquatic resource management. It aims to meet human demand for aquatic products such as fish, shellfish, shrimp and crabs, while reducing the pressure on fishing wild aquatic resources. With the improvement of people's consumption level, the demand for high-quality, safe and sustainable aquatic products continues to increase, so it is necessary to strictly control the water quality in the aquaculture process and regularly take water samples for testing.

[0003] An impact-resistant and deflection-resistant aquaculture sampler and method of use (publication number: CN116858605A) in the prior art uses a guide component to guide the water flow to ensure the stability of the sampling device, and then uses a pull rope to allow the sampling device to collect samples at a specified depth. However, the device can only collect samples of one depth each time it is put into the water, and it has to return to the water surface and be dumped before it can be put into the water again for sampling, resulting in low sampling efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a sampling device for aquaculture and a method of using the same.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A sampling device for aquaculture comprises a positioning rod, an upper sealing cover, a lower sealing cover and a sampling barrel are slidably sleeved on the surface of the positioning rod, a plurality of sample storage chambers are opened inside the sampling barrel, each of the sample storage chambers is provided with a piston mechanism for sampling, a plurality of liquid inlets connected to the sample storage chamber are opened at the bottom of the sampling barrel, a filter plate is fixedly installed in each of the liquid inlets, a rotating drum is rotatably sleeved on the surrounding surface of the sampling barrel, the bottom of the rotating drum abuts against the bottom of the sampling barrel and blocks the filter plate, the bottom of the rotating drum is provided with a waist groove hole adapted to the liquid inlet, a slag cleaning mechanism is provided in the waist groove hole, a circular slide groove is opened at the top of the sampling barrel, a moving block with an arc structure is slidably installed in the circular slide groove, a slope is opened on one side of the moving block, and a push block is fixedly installed on the other side, the moving block is fixedly installed on the inner wall of the rotating drum away from the positioning rod, and a plurality of limiting mechanisms are circumferentially arranged around the upper sealing cover.

[0007] As a further solution of the present invention, the positioning rod has a hollow structure, and the inner and outer surfaces are symmetrically provided with two second slide grooves and two first slide grooves respectively. The upper sealing cover, the lower sealing cover and the top of the sampling cylinder are all provided with sliding holes adapted to the first slide grooves. The top of the rotating cylinder is rotatably installed on the bottom of the upper sealing cover, and the bottom of the rotating cylinder is rotatably installed on the top of the lower sealing cover.

[0008] As a further solution of the present invention, the limiting mechanism includes a pull rod and a limit pin, the bottom of the upper sealing cover is circumferentially provided with a plurality of limit movable grooves, the pull rod is an inverted L-shaped structure, and the surface of the pull rod is engraved with numerical labels corresponding to different sample storage chambers. One end of the pull rod is slidably installed in the limit movable groove, and a tension spring is fixedly installed at one end of the pull rod, and the other end of the tension spring is fixedly installed on one side of the limit movable groove. The top of the limit pin is fixedly installed on one side of the pull rod through a connecting shaft, and the bottom of the limit pin close to the positioning rod is provided with an inclined surface.

[0009] As a further solution of the present invention, the piston mechanism includes a piston block, a piston rod, a return spring and a disc. The piston block is against the four sides of the sample storage chamber. The piston rod is fixedly installed on the top of the piston block. The return spring is sleeved on the surface of the piston rod and its two ends are respectively fixed to the top of the piston block and the top of the sample storage chamber. A plurality of piston holes matching the piston rod are opened on the top of the sampling cylinder, and the disc is fixedly installed on the top of the piston rod.

[0010] As a further solution of the present invention, two first magnet blocks are symmetrically fixedly installed in the opening at the bottom of the rotating drum, a screw is rotatably installed in the positioning rod, a lifting block is threadedly sleeved on the surface of the screw, and convex rafters matching the second slide groove are provided on the two opposite side edges of the lifting block, a driven gear is rotatably installed in the middle of the bottom of the lifting block, a second magnet block is fixedly installed at the bottom of the driven gear, and the two ends of the second magnet block respectively generate mutual attraction with the two first magnet blocks, and circular holes for avoiding the screw are provided at the bottom of the driven gear and the second magnet block, and a driving gear meshing with the driven gear is rotatably installed on one side of the bottom of the lifting block, a battery and a second motor are fixedly installed on the top edge of the lifting block, and the output end of the second motor is fixedly installed with the rotation center of the top of the driving gear through a connecting shaft through the lifting block.

[0011] As a further solution of the present invention, the slag cleaning mechanism includes a plurality of scrapers, which are evenly distributed and fixedly installed in the waist groove holes, and a plurality of grass-clearing rods are fixedly installed at the bottom of each scraper.

[0012] As a further solution of the present invention, a lower support plate and an upper support plate are fixedly installed at both ends of the positioning rod, a drill bit is fixedly installed in the middle of the bottom of the lower support plate, a control terminal is fixedly installed on one side of the top of the upper support plate, and a first motor is fixedly installed in the middle of the top of the upper support plate, and the output end of the first motor is connected to the top of the screw rod through a coupling.

[0013] A method for using a sampling device for aquaculture, comprising the following steps:

[0014] Step 1: The user arrives at the predetermined waters by boat, gradually submerges the device in the water, and positions it through the positioning rod. The positioning rod is rotated to drill the drill bit into the foundation so that the device can be stably inserted in the water, making the operation process more stable;

[0015] Step 2: Start the first motor through the operation control terminal to drive the screw to rotate, and then drive the sampling cylinder to a predetermined water depth. The sample storage chambers in the sampling cylinder are respectively set as No. 1 sample storage chamber, No. 2 sample storage chamber, and other sample storage chambers numbered in sequence. Then start the second motor to drive the rotating drum to slowly rotate a certain angle, open the liquid inlet at the bottom of the No. 1 sample storage chamber, so that the aquaculture water at this depth enters the No. 1 sample storage chamber after filtering larger impurities through the filter plate. The slow rotation of the rotating drum drives the moving block to slide in the circular slide groove, gradually lifts the disc to drive the piston rod to move upward, and then drives the piston block to compress the reset spring upward, and quickly sucks the water sample into the sample storage chamber;

[0016] Step 3: Continue to start the first motor to drive the sampling tube to sink to different water depths. After reaching a predetermined water depth, stop the first motor and start the second motor to sample the aquaculture water at that depth.

[0017] Step 4: After collecting multiple water samples in the same water area, start the first motor to reverse and drive the sampling tube upward until it leaves the water surface and the top of the upper sealing cover is against the upper support plate. Then reverse the second motor to open the liquid inlet at the bottom of each sample storage chamber one by one. At this time, prepare multiple labeled containers, and recover the water samples in each sample storage chamber in turn. Then reverse the positioning rod to make the bottom drill bit separate from the foundation. Hold the positioning rod and move with the ship to the next water area to continue sampling.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. By setting up a sampling cylinder with multiple sample storage chambers, it can sink to different depths in the same water area for sampling. Multiple samples at different depths can be collected in one immersion, which improves the sampling efficiency. By setting up a rotating cylinder, the filter plate can be cleaned during the sampling process to avoid large impurities in the water blocking the liquid inlet, which improves the smoothness of the equipment sampling process;

[0020] 2. By setting a moving block, when the rotating cylinder opens the liquid inlet at the bottom of the sampling cylinder, the disc is lifted up, and then the piston block is driven upward by the piston rod to generate suction in the sample storage chamber, speeding up the sampling speed. A reset spring is set to facilitate the release of water samples for recovery. The moving block is rotated in the reverse direction to drive the piston block to slowly move down and reset, speeding up the discharge of samples, and further improving the working efficiency of the equipment;

[0021] 3. By setting a limit mechanism, after the moving block lifts the disc to drive the piston mechanism to complete sampling, the limit pin is inserted into the bottom of the disc under the action of the tension spring to limit the disc, thereby preventing the piston mechanism from automatically resetting and pushing the water sample. Combined with the sealing of the filter plate at the bottom of the rotating drum, the loss of water samples in the sample storage chamber is effectively avoided, thereby improving the sealing of the equipment for storing samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of a sampling device for aquaculture proposed by the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a sampling device for aquaculture proposed by the present invention when viewed from above;

[0024] Figure 3 for Figure 2 A schematic diagram of the enlarged structure of part A;

[0025] Figure 4 This is a schematic cross-sectional view of the sampling tube of a sampling device for aquaculture proposed by the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of a sampling tube of a sampling device for aquaculture proposed by the present invention;

[0027] Figure 6 This is a schematic diagram of the explosion structure of a sampling device for aquaculture proposed by the present invention;

[0028] Figure 7 for Figure 6 A schematic diagram of the enlarged structure of part B;

[0029] Figure 8 for Figure 6 A schematic diagram of the enlarged structure of the middle C part;

[0030] Fig. 9 This is a schematic diagram of the partial internal structure of a positioning rod of a sampling device for aquaculture proposed by the present invention.

[0031] In the figure: 1, positioning rod; 2, rotating drum; 3, lower support plate; 4, drill bit; 5, upper support plate; 6, control terminal; 7, first motor; 8, upper sealing cover; 9, lower sealing cover; 10, pull rod; 11, filter plate; 12, waist groove hole; 13, scraper; 14, grass-moving rod; 15, sampling cylinder; 16, piston block; 17, piston rod; 18, reset spring; 19, disc; 20, limit pin; 21, moving block; 22, push block; 23, circular slide; 24, piston hole; 25, tension spring; 26, limit moving groove; 27, screw rod; 28, first magnet block; 29, lifting block; 30, battery; 31, second motor; 32, driving gear; 33, driven gear; 34, second magnet block; 35, first slide; 36, second slide; 37, 38, 39, 40,. DETAILED DESCRIPTION

[0032] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0033] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Reference Figure 1-Figure 9A sampling device for aquaculture comprises a positioning rod 1, an upper sealing cover 8, a lower sealing cover 9 and a sampling barrel 15 are slidably sleeved on the surface of the positioning rod 1, a plurality of sample storage chambers are provided inside the sampling barrel 15, each sample storage chamber is provided with a piston mechanism for sampling, a plurality of liquid inlets connected with the sample storage chambers are provided at the bottom of the sampling barrel 15, a filter plate 11 is fixedly installed in each liquid inlet, a rotating drum 2 is rotatably sleeved on the surrounding surface of the sampling barrel 15, the bottom of the rotating drum 2 abuts against the bottom of the sampling barrel 15 and blocks the filter plate 11, a waist groove hole 12 adapted to the liquid inlet is provided at the bottom of the rotating drum 2, a slag cleaning mechanism is provided in the waist groove hole 12, a circular slide 23 is provided at the top of the sampling barrel 15, a moving block 21 with an arc-shaped structure is slidably installed in the circular slide 23, a slope is provided on one side of the moving block 21, and a push rod is fixedly installed on the other side Block 22, the moving block 21 is fixedly installed on the inner wall of the rotating drum 2 away from the side of the positioning rod 1, and a plurality of limiting mechanisms are arranged in a circle around the upper sealing cover 8. The slag cleaning mechanism includes a plurality of scrapers 13, and the plurality of scrapers 13 are evenly distributed and fixedly installed in the waist groove hole 12. A plurality of weeding rods 14 are fixedly installed at the bottom of each scraper 13. The present invention arranges a sampling cylinder 15, which is provided with a plurality of sample storage chambers, and can be sunk to different depths in the same water area for separate sampling. The collection of multiple samples at different depths can be completed in one immersion, thereby improving the sampling work efficiency. By arranging the rotating drum 2 and the slag cleaning mechanism, the filter plate 11 can be cleaned during the sampling process to prevent larger impurities in the water from clogging the liquid inlet, and the weeding rod 14 can be used to prevent aquatic plants and aquatic organisms from approaching the liquid inlet, thereby improving the smoothness of the equipment sampling process.

[0036] In this embodiment, the positioning rod 1 is a hollow structure, and the inner and outer surfaces are symmetrically provided with two second slide grooves 36 and two first slide grooves 35, respectively. The upper sealing cover 8, the lower sealing cover 9 and the top of the sampling tube 15 are provided with sliding holes adapted to the first slide grooves 35. The top of the rotating drum 2 is rotatably mounted on the bottom of the upper sealing cover 8, and the bottom of the rotating drum 2 is rotatably mounted on the top of the lower sealing cover 9. Two first magnet blocks 28 are symmetrically fixedly installed in the bottom opening of the rotating drum 2. A screw rod 27 is rotatably installed in the positioning rod 1, and a lifting block 29 is threadedly sleeved on the surface of the screw rod 27. The two opposite side edges of the lifting block 29 are provided with a screw rod 27 adapted to the second slide groove 36. A driven gear 33 is rotatably installed in the middle of the bottom of the lifting block 29, and a second magnet block 34 is fixedly installed at the bottom of the driven gear 33. The two ends of the second magnet block 34 respectively generate mutual attraction with the two first magnet blocks 28. Circular holes for avoiding the screw rod 27 are provided at the bottom of the driven gear 33 and the second magnet block 34. A driving gear 32 meshing with the driven gear 33 is rotatably installed on one side of the bottom of the lifting block 29. A battery 30 and a second motor 31 are fixedly installed on the top edge of the lifting block 29. The output end of the second motor 31 passes through the lifting block 29 and is fixedly installed at the top rotation center of the driving gear 32 through a connecting shaft.

[0037] When in use, the drum 2 and the second magnet block 34 maintain synchronous movement through the adsorption force between the first magnet block 28 and the second magnet block 34. In order to maintain the stability of the adsorption force between the two, the positioning rod 1, the screw rod 27, the sampling tube 15, the lifting block 29, the driving gear 32 and the driven gear 33 are all made of non-metallic materials. Through the isolation of the lifting block 29 and the driven gear 33, the second motor 31 will not affect the adsorption force between the second magnet block 34 and the first magnet block 28. The lifting block 29 moves up and down with the screw rod 27. Under the adsorption force of the second magnet block 34, the drum 2 and the sampling tube 15 move up and down along the positioning rod 1. The second motor 31 drives the driving gear 32 to rotate, and the driving gear 32 drives the driven gear 33 to rotate, thereby driving the second magnet block 34 to rotate. The second magnet block 34 drives the two first magnet blocks 28 to rotate, thereby driving the drum 2 to rotate, sampling and releasing samples, thereby improving the linkage consistency of the equipment.

[0038] In this embodiment, the limiting mechanism includes a pull rod 10 and a limiting pin 20. A plurality of limiting movable grooves 26 are circumferentially provided at the bottom of the upper sealing cover 8. The pull rod 10 is an inverted L-shaped structure. Digital labels corresponding to different sample storage chambers are engraved on the surface of the pull rod 10. One end of the pull rod 10 is slidably installed in the limiting movable groove 26. A tension spring 25 is fixedly installed at one end of the pull rod 10. The other end of the tension spring 25 is fixedly installed to one side of the limiting movable groove 26. The top of the limiting pin 20 is fixedly installed to one side of the pull rod 10 through a connecting shaft. An inclined surface is provided at the bottom of the limiting pin 20 close to the positioning rod 1.

[0039] During use, the disk 19 is lifted up by the moving block 21 and gradually pushes the limit pin 20 to slide in the direction away from the positioning rod 1, and stretches the tension spring 25. After the disk 19 moves up to the limit position, the limit pin 20 is against one side of the moving block 21 under the tension of the tension spring 25. When the moving block 21 moves away, the limit pin 20 replaces the moving block 21 to support the disk 19 to prevent it from automatically moving down and then squeezing the sample. The pull rod 10 can be used to guide the position of the liquid inlet under each sample storage chamber, so that the container can be placed in the correct position in advance when the sample is recovered. The pull rod 10 is engraved with numbers on the surface, so that the sampling order of each liquid storage chamber can be clearly known. Combined with the sampling order of each depth during sampling, it is convenient to mark and record the samples when they are recovered to avoid errors, thereby improving the accuracy of subsequent detection data.

[0040] In this embodiment, the piston mechanism includes a piston block 16, a piston rod 17, a return spring 18 and a disc 19. The piston block 16 is against the surrounding of the sample storage chamber, the piston rod 17 is fixedly installed on the top of the piston block 16, the return spring 18 is sleeved on the surface of the piston rod 17 and the two ends are respectively fixedly installed on the top of the piston block 16 and the top of the sample storage chamber, a plurality of piston holes 24 adapted to the piston rod 17 are opened on the top of the sampling cylinder 15, the disc 19 is fixedly installed on the top of the piston rod 17, the lower support plate 3 and the upper support plate 5 are respectively fixedly installed on both ends of the positioning rod 1, a drill bit 4 is fixedly installed in the middle of the bottom of the lower support plate 3, a control terminal 6 is fixedly installed on one side of the top of the upper support plate 5, a first motor 7 is fixedly installed in the middle of the top of the upper support plate 5, and the output end of the first motor 7 is connected to the top of the screw rod 27 through a coupling.

[0041] When in use, by setting the moving block 21, when the rotating cylinder 2 opens the liquid inlet at the bottom of the sampling cylinder 15, the disc 19 above the corresponding sample storage chamber is lifted, and then the piston block 16 is driven to move up through the piston rod 17, and suction is generated in the sample storage chamber to accelerate the sampling speed. The reset spring 18 is set to facilitate the release of the water sample for recovery. During the process of rotating the moving block 21 in the opposite direction, the piston block 16 is driven to slowly move down and reset, which accelerates the discharge of the sample and further improves the working efficiency of the equipment. During the sample release process, the pushing block 22 on one side of the moving block 21 first enters under the disc 19 to support the disc 19, and then gradually pushes the limit pin 20 to make it leave under the disc 19, so that the disc 19 slides down slowly and evenly along the inclined surface of the moving block 21 under the action of the reset spring 18, so that the piston block 16 can slowly and evenly push the sample to leave the sampling cylinder 15, thereby improving the stability of the sample recovery process and avoiding the sudden release of the sample, splashing around and causing waste, which affects the subsequent detection;

[0042] The upper support plate 5 can be used to install the control terminal 6. A handle can be set on the top of the upper support plate 5 to facilitate the rotation of the positioning rod 1 so that it can be drilled into the foundation through the drill bit 4, and the positioning rod 1 can be fixed to make the sampling process equipment in a stable state. The control terminal 6 is provided with a display screen and a controller for controlling the start and stop of the first motor 7 and the second motor 31. The first motor 7 and the second motor 31 used both have a shutdown self-locking function.

[0043] A method for using a sampling device for aquaculture, comprising the following steps:

[0044] S1: The user arrives at the predetermined water area by boat, gradually submerges the device into the water, and positions it through the positioning rod 1, rotates the positioning rod 1 to drill the drill into the foundation, so that the device can be stably inserted into the water, making the operation process more stable;

[0045] S2: Start the first motor 7 by operating the control terminal 6 to drive the screw 27 to rotate, and then drive the sampling tube 15 to reach a predetermined water depth. The sample storage chambers in the sampling tube 15 are respectively set as a number of sample storage chambers numbered in sequence, such as the No. 1 sample storage chamber and the No. 2 sample storage chamber. Then start the second motor 31 to drive the rotating drum 2 to slowly rotate a certain angle, open the liquid inlet at the bottom of the No. 1 sample storage chamber, so that the aquaculture water at this depth enters the No. 1 sample storage chamber after filtering larger impurities through the filter plate 11. The slow rotation process of the rotating drum 2 drives the moving block 21 to slide in the circular slide 23, gradually lifts the disc 19 to drive the piston rod 17 to move upward, and then drives the piston block 16 to compress the reset spring 18 upward, and quickly sucks the water sample into the sample storage chamber;

[0046] S3: Continue to start the first motor 7 to drive the sampling tube 15 to sink to different water depths. After reaching a predetermined water depth, stop the first motor 7 and start the second motor 31 to sample the aquaculture water at that depth.

[0047] S4: After collecting multiple water samples in the same water area, start the first motor 7 to reverse and drive the sampling tube 15 to move upward until it leaves the water surface and the top of the upper sealing cover 8 abuts against the upper support plate 5. Then reverse the second motor 31 to open the liquid inlet at the bottom of each sample storage chamber one by one. At this time, prepare multiple labeled containers, and recover the water samples in each sample storage chamber in turn. Then reverse the positioning rod 1 to separate the bottom drill bit 4 from the foundation, and hold the positioning rod 1 and move with the ship to the next water area to continue sampling.

[0048] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A sampling device for aquaculture, comprising a positioning rod (1), characterized in that: The surface of the positioning rod (1) is slidably sleeved with an upper sealing cover (8), a lower sealing cover (9) and a sampling cylinder (15); a plurality of sample storage chambers are provided inside the sampling cylinder (15); each of the sample storage chambers is provided with a piston mechanism for sampling; a plurality of liquid inlets in communication with the sample storage chambers are provided at the bottom of the sampling cylinder (15); a filter plate (11) is fixedly installed in each of the liquid inlets; a rotating cylinder (2) is rotatably sleeved on the surrounding surface of the sampling cylinder (15); the bottom of the rotating cylinder (2) abuts against the bottom of the sampling cylinder (15) and blocks the filter plate (11) The bottom of the rotating drum (2) is provided with a waist groove hole (12) adapted to the liquid inlet, and a slag cleaning mechanism is arranged in the waist groove hole (12). The top of the sampling cylinder (15) is provided with a circular slide groove (23), and a moving block (21) with an arc-shaped structure is slidably installed in the circular slide groove (23). One side of the moving block (21) is provided with an inclined surface, and the other side is fixedly installed with a push block (22). The side of the moving block (21) away from the positioning rod (1) is fixedly installed with the inner wall of the rotating drum (2), and a plurality of limiting mechanisms are arranged around the upper sealing cover (8) in a circular shape.

2. A sampling device for aquaculture according to claim 1, characterized in that: The positioning rod (1) is of a hollow structure, and the inner and outer surfaces are symmetrically provided with two second slide grooves (36) and two first slide grooves (35), respectively; the upper sealing cover (8), the lower sealing cover (9) and the top of the sampling tube (15) are provided with sliding holes adapted to the first slide grooves (35); the top of the rotating drum (2) is rotatably mounted on the bottom of the upper sealing cover (8), and the bottom of the rotating drum (2) is rotatably mounted on the top of the lower sealing cover (9).

3. The sampling device for aquaculture according to claim 1, characterized in that: The limiting mechanism comprises a pull rod (10) and a limiting pin (20), the bottom of the upper sealing cover (8) is circumferentially provided with a plurality of limiting movable grooves (26), the pull rod (10) is an inverted L-shaped structure, and the surface of the pull rod (10) is engraved with digital numbers corresponding to different sample storage chambers, one end of the pull rod (10) is slidably installed in the limiting movable groove (26), a tension spring (25) is fixedly installed at one end of the pull rod (10), and the other end of the tension spring (25) is fixedly installed on one side of the limiting movable groove (26), the top of the limiting pin (20) is fixedly installed on one side of the pull rod (10) through a connecting shaft, and the bottom of the limiting pin (20) close to the positioning rod (1) is provided with an inclined surface.

4. The sampling device for aquaculture according to claim 1, characterized in that: The piston mechanism comprises a piston block (16), a piston rod (17), a return spring (18) and a disc (19); the piston block (16) abuts against the surroundings of the sample storage chamber; the piston rod (17) is fixedly mounted on the top of the piston block (16); the return spring (18) is sleeved on the surface of the piston rod (17) and its two ends are respectively fixedly mounted on the top of the piston block (16) and the top of the sample storage chamber; a plurality of piston holes (24) matching the piston rod (17) are provided on the top of the sampling cylinder (15); and the disc (19) is fixedly mounted on the top of the piston rod (17).

5. The sampling device for aquaculture according to claim 1, characterized in that: Two first magnet blocks (28) are symmetrically fixedly installed in the bottom opening of the rotating drum (2), a screw rod (27) is rotatably installed in the positioning rod (1), a lifting block (29) is threadedly sleeved on the surface of the screw rod (27), and the two opposite side edges of the lifting block (29) are provided with convex rafters adapted to the second sliding groove (36), a driven gear (33) is rotatably installed in the middle of the bottom of the lifting block (29), and a second magnet block (34) is fixedly installed at the bottom of the driven gear (33), and the two ends of the second magnet block (34) are respectively connected to the second sliding groove (36). The two first magnet blocks (28) generate mutual attraction, the bottoms of the driven gear (33) and the second magnet block (34) are both provided with round holes for avoiding the screw rod (27), a driving gear (32) meshing with the driven gear (33) is rotatably mounted on one side of the bottom of the lifting block (29), a storage battery (30) and a second motor (31) are fixedly mounted on the top edge of the lifting block (29), and the output end of the second motor (31) is fixedly mounted on the top rotation center of the driving gear (32) through the lifting block (29) via a connecting shaft.

6. The sampling device for aquaculture according to claim 1, characterized in that: The slag cleaning mechanism comprises a plurality of scrapers (13), the plurality of scrapers (13) being evenly distributed and fixedly installed in the waist slot hole (12), and a plurality of grass-moving rods (14) being fixedly installed at the bottom of each scraper (13).

7. The sampling device for aquaculture according to claim 1, characterized in that: A lower support plate (3) and an upper support plate (5) are fixedly mounted at both ends of the positioning rod (1), a drill bit (4) is fixedly mounted in the middle of the bottom of the lower support plate (3), a control terminal (6) is fixedly mounted on one side of the top of the upper support plate (5), a first motor (7) is fixedly mounted in the middle of the top of the upper support plate (5), and an output end of the first motor (7) is connected to the top of the screw rod (27) via a coupling.

8. A method for using a sampling device for aquaculture, characterized in that: A sampling device for aquaculture according to any one of claims 1 to 7 is used, comprising the following steps: S1: The user arrives at the predetermined water area by boat, gradually submerges the device into the water, and positions it using the positioning rod (1), and rotates the positioning rod (1) to drill the drill bit into the foundation, so that the device can be stably inserted into the water, making the operation process more stable; S2: The first motor (7) is started by the operation control terminal (6) to drive the screw (27) to rotate, thereby driving the sampling tube (15) to reach a predetermined water depth. The sample storage chambers in the sampling tube (15) are respectively set as a number of sample storage chambers numbered in sequence, such as a number one sample storage chamber, a number two sample storage chamber, etc., and then the second motor (31) is started to drive the rotating drum (2) to slowly rotate a certain angle, and the liquid inlet at the bottom of the number one sample storage chamber is opened, so that the aquaculture water at this depth enters the number one sample storage chamber after filtering larger impurities through the filter plate (11). The slow rotation process of the rotating drum (2) drives the moving block (21) to slide in the circular slide groove (23), gradually lifting the disc (19) to drive the piston rod (17) to move upward, thereby driving the piston block (16) to compress the return spring (18) upward, and quickly sucking the water sample into the sample storage chamber; S3: Continue to start the first motor (7) to drive the sampling tube (15) to sink to different water depths, stop the first motor (7) and then start the second motor (31) after reaching a predetermined water depth, and sample the aquaculture water at that depth; S4: After collecting multiple water samples in the same water area, the first motor (7) is started to reverse, driving the sampling tube (15) to move upward until it leaves the water surface and the top of the upper sealing cover (8) abuts against the upper support plate (5), and then the second motor (31) is reversed to open the liquid inlet at the bottom of each sample storage chamber one by one. At this time, multiple labeled containers are prepared, and the water samples in each sample storage chamber are recovered in turn. Then, the positioning rod (1) is reversed to separate the bottom drill bit (4) from the foundation, and the positioning rod (1) is held and moved with the ship to the next water area to continue sampling.

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