Aquaculture pond desilting device

Abstract

The present invention provides a dredging device for aquaculture ponds, which can utilize hydraulic drive to adaptively distribute the water flow rate of flushing sludge and driving the turbine of a waterwheel assembly according to the traveling speed at the bottom of the pond. The dredging device is provided with at least one cover plate and one water inlet pipe assembly radially on the side of a middle seat, and a group of waterwheel assemblies capable of receiving the water flow impact of the water inlet pipe assembly are provided at the ends of the cover plate and the water inlet pipe assembly, thereby driving the entire dredging device to rotate and travel at the bottom of the pond, while flushing the sludge at the bottom of the pond and guiding the vortex-shaped water flow to be discharged from the central drain port in a centralized manner to avoid the diffusion of sludge. In particular, when the traveling speed of the dredging device slows down and the resistance of the water flow entering the waterwheel assembly increases, the water flow rate of flushing the sludge at the bottom of the pond can be adaptively increased to improve its flushing capacity, effectively solving the shortcomings of poor dredging efficiency and inconvenient maintenance of the known technology.

Description

Technical Field

[0001] The present invention relates to a silt removal device for aquaculture ponds. The technical content involves utilizing hydraulic power to drive a waterwheel assembly, through which the entire silt removal device is driven to rotate and move on the bottom of the pond, and the water flow rate for flushing silt and driving a turbine of the waterwheel assembly can be adaptively distributed according to the travel speed. Background Art

[0002] In the fish farming management technology, the problem of silt accumulation at the bottom of the breeding pond has always been a technical bottleneck that the aquaculture industry is eager to overcome. Silt is mainly produced by artificial feeding. The higher the breeding density and the greater the amount of feeding, the faster the silt accumulates. The substances in the silt include fish and shrimp feces, uneaten feed, dead deposited microalgae, and soil particles produced by water flow, etc. It contains rich organic matter, resulting in a very high bacterial content. It not only consumes dissolved oxygen in the water, making the silt anaerobic, but also produces extremely toxic hydrogen sulfide and continuously releases toxic ammonia (NH3).

[0003] Taking shrimp farming as an example, studies have shown that shrimp are very sensitive to the toxicity of hydrogen sulfide. As long as there is 0.0064 ppm of hydrogen sulfide in the water, the shrimp will become anxious, and 0.013 ppm will cause them to become paralyzed. The specific gravity of silt is only slightly greater than that of water, and it is easy to become suspended if it is slightly disturbed, so it is difficult to remove, especially in the later stages of farming because of the huge amount of accumulated silt and the increase in feed intake, which increases the load on water quality. It is like a dangerous time bomb, which can easily induce disease and mass death in bad weather or at night due to lack of oxygen.

[0004] Many research results suggest that silt should be removed regularly during the aquaculture process, especially in high-density shrimp ponds, where it is best to remove silt every day. However, silt removal must be done very carefully, because the slightest carelessness may disturb the silt and release hydrogen sulfide, which will increase the danger. Therefore, how to quickly and safely remove silt has always been a difficult problem for the aquaculture industry, because removing silt is worried about releasing hydrogen sulfide, and not removing silt will deteriorate water quality, which has become a major concern and threat to aquaculture operators and has limited aquaculture density.

[0005] In order to solve the problem of removing silt from aquaculture ponds, one of the inventors of this case once invented a Taiwan patent with the publication number TWI331012 "Method and device for removing sediment from aquaculture ponds". The structure of the patent is that a rotatable cover plate is set under the water surface. The inner end of the cover plate is sleeved on the drain outlet of the aquaculture pond, and a roller is pivotally provided on the outer end. The roller is driven by a motor and a transmission chain set on the water surface, so that the roller can drive the cover plate to rotate around the drain outlet as the axis.

[0006] A row of brushes is provided on the edge of the cover plate at the rear side downward in the direction of travel, so that the cross-section of the cover plate is approximately inverted L-shaped, and a semi-enclosed area is formed between the cover plate and the top surface of the pool bottom; a plurality of nozzles are provided on the bottom surface of the cover plate, and when the roller drives the cover plate to rotate and move, the plurality of nozzles can continuously spray water toward the drain port, so that the water flow flushes the silt on the bottom of the pool and the silt is quickly moved to the drain port for discharge.

[0007] Due to the semi-enclosed area between the cover plate, the brush and the top surface of the pool bottom, the water flow sprayed from multiple nozzles can produce a wall-jet effect, and according to the Persnickety principle, negative pressure is generated in the direction toward the cover plate, so that the aquaculture pond water can flow toward the bottom of the cover plate, and then the water flow sprayed from the nozzles assists the sludge to move toward the drain and then be discharged, avoiding the problem of direct scouring of sludge and causing diffusion as in the traditional way, and achieving the effect of quickly removing sludge.

[0008] After the implementation of the above Taiwan Patent TWI331012, the design of the cover plate can indeed avoid the disturbance of releasing hydrogen sulfide during the sludge removal process, and also has the advantages of fast silt removal and saving labor costs. However, the motor of Taiwan Patent TWI331012 must be set on the water surface, and the roller is located at the bottom of the pool. The distance between the two is as high as 2 to 3 meters or even longer, which makes the chain transmission distance too long. Especially when the roller passes through the uneven bottom of the pool, the chain will present a staggered state of relaxation and tension, making the chain easy to loosen and malfunction; in addition, the uneven bottom of the pool will often hinder the movement of the entire device, but the motor still continues to output power, which is not only easy to cause damage to the motor and affect the silt removal efficiency, but also requires professionals to go to the center of the breeding pond to repair the chain, motor and other driving components, which takes more time and cost on maintenance. Therefore, the inventors imagine that if the driving method of the known technology can be further improved, it will be possible to make the practicality more perfect. Summary of the invention

[0009] The object of the present invention is to provide a silt removal device for aquaculture ponds, which utilizes hydraulic drive to rotate at the bottom of the aquaculture pond and simultaneously flush and remove the silt at the bottom of the pond. In particular, the device can adaptively distribute the water flow for flushing the silt and driving the turbine of the waterwheel assembly according to the travel speed, thereby achieving the purpose of quickly and cost-effectively removing the silt.

[0010] In order to achieve the above-mentioned purpose, the present invention provides a silt removal device for aquaculture ponds, which is driven by hydraulic power to rotate at the bottom of the aquaculture pond and simultaneously flush and remove the silt at the bottom of the pond. The device comprises:

[0011] A middle seat rotatably connected to a drain outlet of the culture pond, wherein the top and bottom of the middle seat are respectively provided with a water inlet cavity and a water discharge cavity isolated from each other, wherein the water inlet cavity is connected to an external water pump for water supply, and the water discharge cavity is located in a shell, wherein the shell covers the outer periphery above the drain outlet and is provided with an opening on the side;

[0012] At least one cover plate fixed to the side of the middle seat and extending radially, the cover plate can rotate and move synchronously with the middle seat, and is arranged to be inclined upward in the moving direction, and a scraper is arranged at the rear bottom adjacent to the bottom of the breeding pond;

[0013] At least one set of water inlet pipe components radially extending from the water inlet cavity, the water inlet pipe components are provided with at least one nozzle extending downward, the nozzle is located below the cover plate and in front of the scraper, and the nozzle can spray water toward the opening of the drainage cavity;

[0014] a waterwheel assembly disposed at the end of the water inlet pipe assembly and the outer end of the cover plate, the waterwheel assembly comprising a turbine capable of being driven to rotate by the impact of the water flow of the water inlet pipe, and a roller driven by the turbine to roll on the bottom of the aquaculture pond, thereby driving the entire silt removal device to rotate around the drain outlet as the axis, and the nozzle continuously sprays water toward the drain cavity during the movement, so that the silt on the bottom of the pond located below the cover plate and in front of the scraper is flushed toward the drain cavity by the water flow and then discharged from the drain outlet; and

[0015] When the traveling speed of the waterwheel assembly slows down and the water flow resistance entering the turbine through the water inlet pipe assembly increases, the water flow distributed to the nozzle by the water inlet pipe assembly increases relatively, thereby adaptively enhancing the flushing ability of the pool bottom sludge.

[0016] The implementation of each element is further described below:

[0017] During implementation, an axial connection sleeve extends downward from the top of the outer shell relative to the drain port; a drain pipe connected to the outside of the breeding pond is provided in the drain port, an axial connection pipe extending upward is inserted and fixed on the drain pipe, and the axial connection sleeve is sleeved on the axial connection pipe, so that the outer shell of the middle seat and the axial connection sleeve can rotate relative to the drain port and the axial connection pipe with the axial connection pipe as the axis.

[0018] During implementation, a plurality of through holes are opened on the pipe wall of the shaft pipe, and each through hole is provided with a movable door sheet which can be automatically pushed by water flow to open toward the inner side of the pipe wall.

[0019] During implementation, the shell is detachably provided with an arc-shaped baffle plate bent toward the drainage cavity at the edge of the opening, so that the water flow entering the drainage cavity from the opening forms a vortex water flow along the guidance of the baffle plate and is discharged from the drainage port in a centralized manner.

[0020] During implementation, the water inlet chamber is arranged above the outer shell, and includes an outer sleeve fixed above the outer shell, an inner tube axially arranged inside the outer sleeve, and a water inlet joint connecting the external water pump and the inner tube; wherein, the internal space of the outer sleeve constitutes the water inlet chamber, and its side is connected to the water inlet pipe assembly; the bottom of the water inlet joint is connected in series with the inner tube, so that the outer shell can synchronously drive the outer sleeve to rotate relative to the water inlet joint and the inner tube.

[0021] During implementation, the waterwheel assembly further includes a support frame fixed to the outer end of the cover plate, the turbine and the roller are respectively pivoted on the support frame, and a group of reduction gear sets and chains are provided between the turbine and the roller, so that the turbine can drive the roller to rotate through the reduction gear set and the chain.

[0022] During implementation, a bypass port connected to the culture pond is provided near the end of the water inlet pipe assembly, and at least one set of switch valves capable of distributing the water flow between the turbine and the bypass port are provided.

[0023] During implementation, the outer end of the cover plate can be connected and abutted against the inner end of another cover plate, and an auxiliary wheel that can roll on the bottom of the pool is provided at the position where the two cover plates are connected and abutted against each other, and the auxiliary wheel is straddled between the bottom surfaces of the two cover plates.

[0024] During implementation, the water inlet pipe assembly at least includes a hard pipe, a bellows pipe and a pipe joint that are connected in series. The nozzle extends downward from the hard pipe and is positioned below the cover plate. The pipe joint can be connected in series with another water inlet pipe assembly so that its length can match the two connected cover plates.

[0025] During implementation, the cover plate is provided with a second auxiliary wheel behind the scraper blade that can roll on the pool bottom.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. The present invention is disposed as a whole under the water surface, and utilizes hydraulic power to drive the waterwheel assembly, which drives the entire set of silt removal devices to rotate and move on the bottom of the pool, thereby improving the shortcomings of the known technology of using a motor as a power source and inconvenient maintenance.

[0028] 2. The present invention utilizes hydraulic drive to drive the entire silt removal device to rotate and move at the bottom of the pool, and can adaptively distribute the water flow rate for driving the turbine and flushing the sludge according to the travel speed; when the resistance of the water flow of the water inlet pipe assembly entering the turbine of the waterwheel assembly becomes larger, the water flow rate allocated to the nozzle is relatively increased, thereby being able to adaptively enhance the flushing ability of the sludge on the bottom of the pool.

[0029] 3. The present invention sets an arc-shaped baffle on the side of the drainage cavity, so that after the sludge is pushed into the drainage cavity by the water flow, it can form a vortex water flow along the guidance of the baffle and be concentrated and quickly discharged from the drainage port, avoiding the problem of sludge diffusion caused by the water flow rushing the sludge and then flowing back from the opening to the breeding pond.

[0030] 4. The cover plate and the water inlet pipe assembly can be modularly designed and connected in series for expansion, and the turning radius of the dredging device can be adjusted according to the size of the breeding pond and the density of the dredging device, thereby expanding the scope of application. In addition, there is a margin of activity between the multiple cover plates and the multiple water inlet pipe assemblies connected in series in the modular design, which can cope with slightly rugged pool bottom surfaces.

[0031] According to the technical means of the present invention, implementation modes suitable for the present invention are listed below and described with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional appearance diagram of the present invention.

[0033] Figure 2 It is a three-dimensional appearance diagram from another angle of the present invention.

[0034] Figure 3 It is a three-dimensional appearance diagram of the waterwheel assembly of the present invention.

[0035] Figure 4 It is a structural schematic diagram of the middle seat of the present invention.

[0036] Figure 5 It is a schematic diagram of the water flow from the water inlet chamber and the water inlet pipe assembly to the nozzle and the waterwheel assembly of the present invention.

[0037] Figure 6 It is a side structural view of the waterwheel assembly of the present invention.

[0038] Figure 7 It is a schematic diagram of the present invention rotating and traveling on the bottom of a culture pond.

[0039] Figure 8 It is a schematic diagram of the water flow for flushing and removing the sludge at the bottom of the pool according to the present invention.

[0040] Explanation of reference numerals: 100 dredging device; 200 pool bottom; 201 drainage outlet; 202 drainage pipe 203 axial connecting pipe; 204 perforation; 205 movable door piece; 206 drainage device; 300 water pump; 10 middle seat; 11 water inlet cavity; 111 outer sleeve; 112 inner pipe; 113 water inlet joint; 12 drainage cavity; 121 outer shell; 13 opening; 14 axial connecting sleeve; 15 arc baffle; 20 cover plate; 21 scraper; 22 auxiliary wheel; 23 second auxiliary wheel; 30 water inlet pipe assembly; 31 nozzle; 32 bypass port; 33 switch valve; 34 hard pipe; 35 bellows pipe; 36 pipe joint; 40 waterwheel assembly; 41 support frame; 42 turbine; 43 roller; 44 reduction gear set and chain. DETAILED DESCRIPTION

[0041] like Figures 1 to 5 As shown, the present invention provides a silt removal device 100 for aquaculture ponds, which is driven by hydraulic power to rotate on the bottom 200 of the aquaculture pond while flushing and removing silt from the bottom 200 of the pond. The silt removal device 100 includes a middle seat 10, at least one cover plate 20, at least one water inlet pipe assembly 30, and a waterwheel assembly 40.

[0042] The middle seat 10 is rotatably connected to the drain outlet 201 of the culture pond. The top and bottom of the middle seat 10 are respectively provided with a water inlet chamber 11 and a water outlet chamber 12 which are isolated from each other. The water inlet chamber 11 is connected to an external water pump 300 for water supply. The water outlet chamber 12 is located around the top of the drain outlet 201 and is provided with an opening 13 on the side so that the water in the culture pond can enter the water outlet chamber 12 through the opening 13 and then be discharged from the drain outlet 201.

[0043] In order to allow the middle seat 10 to rotate relative to the drain port 201 of the culture pond, during implementation, the drain cavity 12 of the middle seat 10 is located in a shell 121, and the shell 121 covers the outer periphery of the drain port 201. An axial sleeve 14 extends downward from the top of the shell 121 relative to the drain port 201, and a drain pipe 202 connected to the outside is provided in the drain port 201. An axial pipe 203 extending upward is inserted and fixed on the drain pipe 202, and the axial sleeve 14 is sleeved on the axial pipe 203, so that the middle seat 10 and the shell 121 of the drain cavity 12 can rotate relative to the drain port 201 and the axial pipe 203 with the axial pipe 203 as the axis.

[0044] The water inlet chamber 11 is arranged above the outer shell 121, and includes an outer sleeve 111 fixed above the outer shell 121, an inner tube 112 axially arranged inside the outer sleeve 111, and a water inlet joint 113 connecting the external water pump 300 and the inner tube 112; wherein, the internal space of the outer sleeve 111 constitutes the water inlet chamber 11, and its side is connected to the water inlet pipe assembly 30; the bottom of the water inlet joint 113 is connected in series with the inner tube 112, so that the outer shell 121 can synchronously drive the outer sleeve 111 to rotate relative to the water inlet joint 113 without affecting the water inlet joint 113, the inner tube 112 and the external water pump 300 to inject water into the water inlet chamber 11.

[0045] The cover plate 20 is fixed above the side opening 13 of the middle seat 10 and rotates synchronously with the middle seat 10. The cover plate 20 is tilted upward in the direction of travel so as to cover the sludge on the bottom of the pool 200 when moving. A scraper 21 is provided at the bottom of the rear of the cover plate 20 adjacent to the bottom of the breeding pool 20, so that the cross-section of the cover plate 20 and the scraper 21 combined is approximately inverted L-shaped, and a semi-enclosed area is formed between the cover plate 20 and the top surface of the pool bottom 200.

[0046] The water inlet pipe assembly 30 extends radially from the water inlet cavity 11, and is provided with at least one water inlet pipe assembly nozzle 31 extending downward. The nozzle 31 is located below the cover plate 20 and in front of the scraper 21, and the nozzle 31 can spray water toward the opening 13 of the drainage cavity 12. Due to the semi-enclosed area generated between the cover plate 20, the scraper 21 and the top surface of the pool bottom 200, the water flow sprayed from the nozzle 31 can produce a wall jet effect, and according to the Bernoulli principle, a negative pressure is generated in the direction toward the cover plate 20, so that the aquaculture pond water can flow toward the bottom of the cover plate 20, thereby assisting the water flow sprayed from the nozzle 31 to drive the sludge to move along the scraper 21 toward the drainage cavity 12 and then be discharged, while preventing the sludge from spreading.

[0047] like Figure 6 As shown, the waterwheel assembly 40 includes a support frame 41 fixed to the outer end of the cover plate 20, and a turbine 42 and a roller 43 are pivotally mounted on the support frame 41. A set of reduction gears and a chain 44 are arranged between the turbine 42 and the roller 43; the turbine 42 is driven to rotate by the water flow of the water inlet pipe assembly 30, and the roller 43 is driven to roll on the bottom 200 of the culture pond through the reduction gear set and the chain 44; Figures 4 to 7 As shown, the waterwheel assembly 40 drives the entire silt removal device 100 to rotate and move around the drain outlet 201 as the axis, and the nozzle 31 continues to spray water toward the drain cavity 12 during the movement, so that the silt on the pool bottom 200 located below the cover plate 20 and in front of the scraper 21 is flushed toward the drain cavity 12 by the water flow and then discharged from the shaft pipe 203, the drain outlet 201 and the drain pipe 202.

[0048] During implementation, a plurality of through holes 204 are provided on the pipe wall of the axial pipe 203, and each through hole 204 is provided with a movable door 205 that can be automatically pushed by the water flow to open toward the inner side of the pipe wall, so that the sludge can flow into the drain pipe 202 and then be discharged. In addition, in order to ensure that the sludge can be discharged from the drain pipe 202, an external drainage device 206 is provided at the downstream end of the drain pipe 202, and the external drainage device 206 can generate suction to absorb the sludge in the drain pipe 202, so that the sludge can be discharged from the drain pipe 202 more smoothly.

[0049] With the above structure, the aquaculture pond desilting device 100 of the present invention can be completely submerged in water and desilted by using the hydraulic drive rotation of an external pump, so that the vertical distance between the turbine 42 and the roller 43 is much shorter than that of the known technology, thus overcoming the deficiency of the prior art in using a motor or a long chain as the power source.

[0050] In addition, another feature of the present invention is that when the speed of the waterwheel assembly 40 slows down, causing the resistance of the water flow entering the turbine 42 after passing through the water inlet pipe assembly 30 to increase, the water flow rate distributed by the water inlet pipe assembly 30 to the nozzle 31 is relatively increased, thereby being able to adaptively enhance the flushing ability of the silt on the pool bottom 200.

[0051] For example, when the entire dredging device 100 slows down the speed of the waterwheel assembly 40 due to the thick silt on the pool bottom 200, the water flow resistance entering the turbine 42 from the water inlet pipe 30 becomes larger, and the water flow in the water inlet pipe assembly 30 can automatically increase the water flow distributed to the nozzle 31 to adaptively enhance the flushing ability of the silt on the pool bottom 200. After clearing the silt on the pool bottom 200, the entire dredging device 100 can continue to rotate and move forward, effectively solving the shortcomings of poor dredging efficiency and inconvenient maintenance of the known technology.

[0052] In addition, the desilting device 100 can also manually adjust the travel speed to match the size of the aquaculture pond or the aquaculture density. During implementation, the water inlet pipe assembly 30 is provided with a bypass port 32 connected to the aquaculture pond near the end thereof, and is provided with at least one set of switch valves 33 capable of distributing the water flow to the turbine 42 and the water flow from the bypass port 32, so as to adjust the water flow to the turbine 42 according to the sludge deposition condition, thereby adjusting the travel speed of the desilting device 100.

[0053] like Figure 2 , Figure 4 , Figure 8As shown, during implementation, the outer shell 121 is provided with an arc-shaped baffle plate 15 bent toward the drainage chamber 12 at the edge of the opening 13, so that when the entire silt removal device 100 rotates and moves, the sludge on the pool bottom 200 located below the cover plate 20 and in front of the scraper 21 is pushed toward the opening 13 by the water flow and enters the drainage chamber 12, and forms a vortex-shaped water flow along the guidance of the baffle plate 15 and is discharged quickly and concentratedly from the drainage port 201, thereby preventing the water from entering the drainage chamber 12 and failing to be discharged from the drainage port 201 in time, and flowing back into the pool water from the opening 13, causing the problem of sludge diffusion.

[0054] The arc baffle 15 is preferably fixed to the housing 121 in a detachable manner for easy maintenance. For example, when the outer periphery of the drain port 201 is blocked by a large fish carcass or other debris, the arc baffle 15 can be removed to facilitate personnel to reach into the drain cavity 12 to remove the obstruction.

[0055] Furthermore, in order to adapt to the sizes of different breeding ponds, the cover plate 20 and the water inlet pipe assembly 30 of the dredging device 100 are modularly designed. When implemented, the outer end of the cover plate 20 can be connected and abutted with the inner end of the other cover plate 20, and the position where the two cover plates 20 are connected and abutted is provided with an auxiliary wheel 22 spanning between the bottom surfaces of the two cover plates 20. The cover plate 20 is provided with a second auxiliary wheel 23 behind the scraper 21. The auxiliary wheel 22 and the second auxiliary wheel 23 can roll on the bottom of the pond to assist the roller 43 in driving the entire set of dredging device 100 forward. When implemented, a handle is provided on the side edge of the cover plate 20 for the user to apply force to move the cover plate 20 for modular assembly.

[0056] like Figure 1 , Figure 2 , Figure 6 As shown, during implementation, the water inlet pipe assembly 30 at least includes a hard pipe 34, a bellows pipe 35 and a pipe joint 36 that are connected in series with each other. The nozzle 31 extends downward from the hard pipe 34 and then passes through the cover plate 20 to be positioned below the cover plate 20. The pipe joint 36 can be connected in series with another water inlet pipe assembly 30 so that its length can match the two cover plates 20 connected to each other to achieve a modular function. The assembly quantity of the cover plate 20 and the water inlet pipe assembly 30 is adjusted according to the size of the culture pond and the setting density of the dredging device 100, and the turning radius of the dredging device 100 is adjusted.

[0057] In addition, as shown in the figure, the cover plate 20 is basically composed of a metal frame and a plastic flat plate arranged in the frame, and has a slight bending elasticity. Therefore, when the entire dredging device 100 moves on the rugged bottom 200 of the pool, the metal frame of the cover plate 20 and the accordion pipe 35 of the water inlet pipe assembly 30 can provide a buffer and a margin of activity and bend slightly, which is applicable to both indoor and outdoor breeding ponds, making its application range more extensive.

[0058] The above descriptions of the embodiments and the accompanying drawings are only examples of the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention; any examples that are similar or identical to the purpose, structure, device, feature, etc. of the present invention should fall within the scope of patent protection of the present invention.

Claims

1. A silt removal device for aquaculture ponds, which is driven by hydraulic power to rotate at the bottom of the aquaculture pond and flush and remove the silt at the bottom of the pond, characterized in that: The device includes: A middle seat rotatably connected to a drain outlet of the culture pond, wherein the top and bottom of the middle seat are respectively provided with a water inlet cavity and a water outlet cavity isolated from each other, wherein the water inlet cavity is connected to an external water pump for water inlet, and the water outlet cavity is located in a shell, wherein the shell covers the outer periphery above the drain outlet and is provided with an opening on the side; At least one cover plate fixed to the side of the middle seat and extending radially, the cover plate can rotate synchronously with the middle seat and is inclined upward in the direction of travel, and a scraper is provided at the rear bottom of the cover plate adjacent to the bottom of the breeding pond; At least one set of water inlet pipe components radially extending from the water inlet cavity, the water inlet pipe components are provided with at least one nozzle extending downward, the nozzle is located below the cover plate and in front of the scraper, and the nozzle can spray water toward the opening of the drainage cavity; a waterwheel assembly disposed at the end of the water inlet pipe assembly and the outer end of the cover plate, the waterwheel assembly comprising a turbine capable of being driven to rotate by the impact of the water flow of the water inlet pipe, and a roller driven by the turbine to roll on the bottom of the aquaculture pond, thereby driving the entire silt removal device to rotate around the drain outlet as the axis, and the nozzle continuously sprays water toward the drain cavity during the movement, so that the silt on the bottom of the pond located below the cover plate and in front of the scraper is flushed toward the drain cavity by the water flow and then discharged from the drain outlet; and When the traveling speed of the waterwheel assembly slows down and the water flow resistance entering the turbine through the water inlet pipe assembly increases, the water flow distributed to the nozzle by the water inlet pipe assembly increases relatively, thereby adaptively enhancing the flushing ability of the pool bottom sludge.

2. The aquaculture pond desilting device according to claim 1, characterized in that: An axial connection sleeve extends downward from the top of the shell relative to the drain port; a drain pipe connected to the outside is arranged in the drain port, an axial connection pipe extending upward is inserted and fixed on the drain pipe, and the axial connection sleeve is sleeved on the axial connection pipe, so that the shell of the middle seat and the axial connection sleeve can rotate relative to the drain port and the axial connection pipe with the axial connection pipe as the axis.

3. The aquaculture pond desilting device according to claim 2, characterized in that: A plurality of through holes are provided on the pipe wall of the shaft pipe, and each through hole is provided with a movable door sheet which can be automatically pushed by water flow to open toward the inner side of the pipe wall.

4. The aquaculture pond desilting device according to claim 1, characterized in that: The shell is detachably provided with an arc-shaped baffle plate bent toward the drainage cavity at the opening edge, so that the water flow entering the drainage cavity from the opening forms a vortex-shaped water flow along the guidance of the baffle plate and is discharged from the drainage port in a centralized manner.

5. The aquaculture pond desilting device according to claim 1, characterized in that: The water inlet chamber is arranged above the outer shell, and includes an outer sleeve fixed above the outer shell, an inner tube axially arranged inside the outer sleeve, and a water inlet joint connecting the external water pump and the inner tube; the internal space of the outer sleeve constitutes the water inlet chamber, and its side is connected to the water inlet pipe assembly; the bottom of the water inlet joint is connected in series with the inner tube, so that the outer shell can synchronously drive the outer sleeve to rotate relative to the water inlet joint and the inner tube.

6. The aquaculture pond desilting device according to any one of claims 1 to 5, characterized in that: The waterwheel assembly also includes a support frame fixed to the outer end of the cover plate, the turbine and the roller are respectively pivoted on the support frame, and a group of reduction gear sets and chains are arranged between the turbine and the roller, so that the turbine can drive the roller to rotate through the reduction gear set and the chain.

7. The aquaculture pond desilting device according to any one of claims 1 to 5, characterized in that: A bypass port connected to the culture pond is arranged near the end of the water inlet pipe assembly, and at least one set of switch valves capable of distributing the water flow of the turbine and the bypass port are arranged.

8. The aquaculture pond desilting device according to any one of claims 1 to 5, characterized in that: The outer end of the cover plate can be connected and abutted against the inner end of another cover plate, and an auxiliary wheel capable of rolling on the pool bottom is provided at the position where the two cover plates are connected and abutted against each other, and the auxiliary wheel is straddled between the bottom surfaces of the two cover plates.

9. The aquaculture pond desilting device according to claim 8, characterized in that: The water inlet pipe assembly at least includes a hard pipe, a bellows pipe and a pipe joint connected in series. The nozzle extends downward from the hard pipe and is positioned below the cover plate. The pipe joint can be connected in series with another water inlet pipe assembly so that its length can match the two connected cover plates.

10. The aquaculture pond desilting device according to any one of claims 1 to 5, characterized in that: The cover plate is provided with a second auxiliary wheel behind the scraper blade which can roll on the pool bottom.

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