An amphibious dredging device

Abstract

This invention discloses an amphibious dredging device, relating to the field of dredging equipment technology. It includes a body, a cutting and suction unit, and a dewatering and screening unit. The body can move on land or underwater. One end of the cutting and suction unit is connected to the body, and the other end is used to cut and suction silt. A dewatering and screening unit is installed within the body, with its inlet connected to the outlet of the cutting and suction unit to receive silt. The dewatering and screening unit can dewater and screen the silt before storing it within the body. On one hand, this gives the amphibious dredging device a dewatering and screening function, increasing its mobility and ensuring the continuity of dredging operations. On the other hand, the dewatering and screening process removes water and light-phase particles from the silt, significantly reducing the volume requirement and weight of the amphibious dredging device, and preventing clogging issues.

Description

Technical Field

[0001] This invention relates to the field of dredging equipment technology, and in particular to an amphibious dredging device. Background Technology

[0002] In the middle and lower reaches of rivers and connected lakes, the slowdown in water flow and the reduced sediment transport capacity have led to the long-term deposition of large amounts of sediment, forming silt mainly composed of fine sand and silt. This type of silt is characterized by its small particles, high fluidity, and tendency to compact. As the amount of silt accumulates, it not only leads to insufficient channel depth and a significant reduction in navigation capacity, but also weakens the flood control and water storage functions of lakes, exacerbating the risk of regional flooding. Therefore, efficient dredging of silt in this area has become an urgent technical challenge.

[0003] Currently, amphibious dredging devices are one of the main pieces of equipment for dredging operations in the middle and lower reaches of rivers and connected lakes due to their amphibious operation capabilities and adaptability to complex conditions such as shallows and swamps. However, existing amphibious dredging devices can only perform suction and preliminary transfer of mud and sand, and are connected to dewatering and screening devices set up on the ground through conveying pipelines to transport the suctioned mud-containing sand to the ground-based supporting equipment for dewatering and screening in real time. This operation mode limits the movement range of the amphibious dredging device due to the length and laying range of the conveying pipeline. In addition, the pipeline connection requires additional laying and dismantling procedures, which increases the complexity of the operation and labor costs, and affects the continuity of dredging operations.

[0004] To address the limitations imposed by the aforementioned pipeline connections, some solutions propose storing the pumped silt in the silt storage compartment of the amphibious dredging device before it is brought ashore for centralized transfer and further processing. However, this approach results in an excessively large and heavy amphibious dredging device, affecting its flexibility and maneuverability in amphibious operations. Furthermore, the pumped cement-containing sand stored inside the device is prone to hardening or silting, leading to blockages in the silt storage compartment, transport channels, and other components, thus interrupting dredging operations. Summary of the Invention

[0005] The purpose of this invention is to provide an amphibious dredging device to solve the problems existing in the prior art, expand the mobility range of the amphibious dredging device, reduce the volume and weight of the amphibious dredging device, and ensure the continuity of the amphibious dredging device.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides an amphibious dredging device, comprising a body, a cutting and suction unit, and a dewatering and screening unit. The body is capable of moving on land or underwater. One end of the cutting and suction unit is connected to the body, and the other end is used to cut and suction silt. The dewatering and screening unit is disposed within the body, with its inlet connected to the outlet of the cutting and suction unit to receive silt. The dewatering and screening unit can dewater and screen the silt before storing it within the body.

[0007] In some embodiments, the shredding and suction unit includes a shredding head, a robotic arm, and a suction pipe. One end of the robotic arm is connected to the machine body, and the other end is fixedly connected to the shredding head. The shredding head can shred the sediment at the bottom of the water. The inlet of the suction pipe is located on the side of the shredding head near the machine body, and the outlet of the suction pipe is connected to the feed inlet of the dewatering and screening unit. The suction pipe can transport the sediment shredded by the shredding head to the dewatering and screening unit.

[0008] In some embodiments, the dewatering and screening unit includes a dewatering section and a screening section. The outlet of the suction pipe is connected to the inlet of the dewatering section, and the outlet of the dewatering section is connected to the inlet of the screening section. The dewatering section is capable of centrifugally dewatering the sludge, and the screening section is capable of screening the sludge according to its particle size.

[0009] In some embodiments, the dewatering section includes a hydrocyclone with a hydrocyclone inlet, a hydrocyclone outlet, and a hydrocyclone overflow. The hydrocyclone inlet is connected to the outlet of the suction pipe. The hydrocyclone is capable of swirling and settling sediment. The hydrocyclone outlet is connected to the inlet of the screening section to discharge heavy phase particles into the inlet of the screening section. The hydrocyclone overflow is used to discharge light phase particles and water.

[0010] In some embodiments, the dewatering section includes a plurality of hydrocyclones connected in series, with the outlet of the preceding hydrocyclone connected to the inlet of the following hydrocyclone, so as to perform multi-stage swirling sedimentation on the silt.

[0011] In some embodiments, the screening section includes a three-stage drum screen, which includes three screen cylinders arranged sequentially along the front-rear direction of the machine body. The three screen cylinders are coaxially arranged, and the screen mesh size of the three screen cylinders gradually increases from front to back. A storage bin is provided at the bottom of each of the three screen cylinders.

[0012] In some embodiments, the amphibious sludge removal device further includes a cleaning unit, which includes a backflushing pipe and a three-way valve. The three-way valve includes a first interface, a second interface, and a third interface. The three-way valve is located at one end of the suction pipe near the dewatering and screening unit, and both the first interface and the second interface are connected to the suction pipe. The first interface is closer to the cutting head than the second interface. One end of the backflushing pipe is used to introduce water, and the other end is connected to the third interface. When the three-way valve is in a first state, the first interface is connected to the second interface to deliver sludge to the dewatering and screening unit. When the three-way valve is in a second state, the third interface is connected to the first interface to allow water to flow sequentially through the suction pipe and the cutting head.

[0013] In some embodiments, the amphibious dredging device further includes self-stabilizing units. Two self-stabilizing units are symmetrically arranged on both sides of the body. Each self-stabilizing unit includes a gravity body, a lead screw, and a guide rod. The lead screw and the guide rod are arranged parallel to each other along the front-back direction of the body. The gravity body is sleeved on the lead screw and the guide rod. The gravity body is threadedly engaged with the lead screw. The lead screw can rotate around its own axis so that the gravity body can move back and forth along the body.

[0014] In some embodiments, the amphibious dredging device further includes a drive unit, which includes a ground walking part and an underwater moving part. The ground walking part includes triangular track walking mechanisms symmetrically arranged on both sides of the body to drive the body to walk on the ground. The underwater moving part includes a propeller arranged on the rear side of the body to drive the body to move underwater.

[0015] In some embodiments, the amphibious dredging device further includes a control unit, which is signal-connected to the cutting and suction unit, the dewatering and screening unit, the washing unit, the self-stabilizing unit, and the driving unit.

[0016] The present invention achieves the following technical effects compared to the prior art: This invention provides an amphibious dredging device. By placing a dewatering and screening unit inside the machine body and connecting the inlet of the dewatering and screening unit to the outlet of the sluice suction unit, the device directly dewaters and screens silt within the machine body after receiving it, and stores the dewatered and screened sand inside the machine body. This allows the amphibious dredging device to not only have silt suction capabilities but also dewatering and screening functions. The dewatered and screened sand can be temporarily stored inside the machine body, eliminating the need for a connection to a ground-based dewatering and screening device via a conveying pipeline, thus increasing the amphibious dredging capability of the device. The device's mobility is limited, and no additional pipeline laying or dismantling procedures are required, ensuring the continuity of dredging operations. On the other hand, the silt is dewatered and screened by the dewatering and screening unit and then stored in the machine body. The dewatering and screening process removes water and light phase particles from the silt, leaving only heavy phase particles in the machine body. This greatly reduces the volume requirement of the amphibious dredging device and lightens its weight. It also avoids the phenomenon of silt hardening or accumulating in the machine body, which can cause blockages and further ensure the continuity of dredging operations. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the amphibious dredging device in some embodiments of the present invention; Figure 2 This is a schematic diagram of the amphibious dredging device from another perspective in some embodiments of the present invention; Figure 3 This is a schematic diagram of the hydrocyclone structure in some embodiments of the present invention; Figure 4 This is a schematic diagram of the hydrocyclone structure from another perspective in some embodiments of the present invention; Figure 5 This is a schematic diagram of the screening section structure in some embodiments of the present invention.

[0019] In the diagram: 1-Machine body; 2-Cleaning and suction unit; 21-Cleaning head; 211-Main auger; 212-Cover; 213-Auxiliary auger; 22-Mechanical arm; 221-Turntable; 23-Suction pipeline; 3-Dewatering and screening unit; 31-Dewatering section; 311-Hydrocyclone; 3111-Hydrocyclone inlet; 3112-Hydrocyclone outlet; 3113-Hydrocyclone overflow port; 32-Screwing section; 321-Three-stage drum screen; 322-Storage bin; 4-Washing unit; 41-Three-way valve; 5-Self-stabilizing unit; 51-Screw; 52-Gravity body; 6-Drive unit; 61-Ground walking section; 611-Triangular track walking mechanism. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] The purpose of this invention is to provide an amphibious dredging device to solve the problems existing in the prior art, expand the mobility range of the amphibious dredging device, reduce the volume and weight of the amphibious dredging device, and ensure the continuity of the amphibious dredging device.

[0022] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] This invention provides an amphibious dredging device, such as... Figures 1-5As shown, the system includes a body 1, a cutting and suction unit 2, and a dewatering and screening unit 3. The body 1 can move on land or underwater. One end of the cutting and suction unit 2 is connected to the body 1, and the other end is used to cut and suction the silt. The dewatering and screening unit 3 is installed inside the body 1. The inlet of the dewatering and screening unit 3 is connected to the outlet of the cutting and suction unit 2 to receive the silt. The dewatering and screening unit 3 can dewater and screen the silt and store it inside the body 1. By placing the dewatering and screening unit 3 inside the machine body 1 and connecting its inlet to the outlet of the cutting and suction unit 2, the amphibious dredging device can directly dewater and screen the silt within the machine body 1 after receiving it, and store the dewatered and screened sand inside the machine body 1. This allows the amphibious dredging device to not only have silt suction capabilities but also dewatering and screening functions. The dewatered and screened sand can be temporarily stored inside the machine body 1, eliminating the need to connect it to a ground-based dewatering and screening device via a conveying pipeline, thus increasing the mobility of the amphibious dredging device. Furthermore, no additional pipeline laying and dismantling procedures are required, ensuring the continuity of dredging operations. On the other hand, the silt is dewatered and screened by the dewatering and screening unit 3 and then stored in the body 1. The dewatering and screening process removes water and light phase particles from the silt, leaving only heavy phase particles stored in the body 1. This greatly reduces the volume requirement of the amphibious dredging device and lightens its weight. It also avoids the phenomenon of silt hardening or accumulating in the body 1, which could lead to blockages in the body 1, further ensuring the continuity of dredging operations.

[0024] In some embodiments, the slugging and suction unit 2 includes a slugging head 21, a robotic arm 22, and a suction pipe 23. One end of the robotic arm 22 is connected to the machine body 1, and the other end is fixedly connected to the slugging head 21. The slugging head 21 can shred the sediment at the bottom of the water. The inlet of the suction pipe 23 is located on the side of the slugging head 21 close to the machine body 1, and the outlet of the suction pipe 23 is connected to the feed inlet of the dewatering and screening unit 3. The suction pipe 23 can transport the sediment shredded by the slugging head 21 to the dewatering and screening unit 3. Through the rotational cutting, loosening, and breaking of the hardened layer by the slugging head 21, and the chopping of long strips of debris, the solid sludge is further mixed with water to become a flowing slurry. Then, the slurry is transported to the dewatering and screening unit 3 through the suction pipe 23. In some embodiments, the shredder head 21 includes a main cutter 211, a first drive motor, and a cover 212. One end of the cover 212 is fixedly connected to the end of the robotic arm 22, and the other end is open. The main cutter 211 is disposed at the opening. The body of the first drive motor is fixedly disposed inside the cover 212, and the output shaft of the first drive motor is fixedly connected to the axis of the main cutter 211. The inlet of the suction pipe 23 communicates with the interior of the cover 212. The first drive motor can drive the main cutter 211 to rotate around the output shaft of the first drive motor, so that the main cutter 211 shreds the sediment. In some embodiments, an image acquisition device is also provided on the circumferential outer wall of the cover 212 away from the main cutter 211 to acquire images of the sediment at the bottom of the water. In some embodiments, a turntable 221 is provided between the end of the robotic arm 22 connected to the body 1 and the body 1. The end of the robotic arm 22 away from the shredder head 21 is rotatably connected to the top of the turntable 221, and the bottom of the turntable 221 is rotatably connected to the body 1.

[0025] In some embodiments, at least two auxiliary cutters 213 are provided on the circumferential outer wall of the cover 212. The axis of each auxiliary cutter 213 is connected to the output shaft of the first drive motor. The diameter of the auxiliary cutter 213 is smaller than that of the main cutter 211. After the first motor is started, the auxiliary cutter 213 and the main cutter 211 rotate together. The auxiliary cutter 213 is used to pre-loosen the sediment at the bottom of the water to improve the working efficiency of the main cutter 211.

[0026] In some embodiments, the dewatering and screening unit 3 includes a dewatering section 31 and a screening section 32. The outlet of the suction pipe 23 is connected to the inlet of the dewatering section 31, and the outlet of the dewatering section 31 is connected to the inlet of the screening section 32. The dewatering section 31 can centrifugally dewater the sludge, and the screening section 32 can screen the sludge according to its particle size. The slurry formed after the sludge is shredded has a high water content. By centrifuging the sludge in the dewatering section 31, the material is transformed from fluid slurry into loose solid mud blocks, and the viscosity is greatly reduced to reduce the probability of sludge clogging the screen. The screening section 32 screens the material to separate large debris (garbage, stones, vegetation) and commercially usable sand, thereby realizing the classification, disposal, and resource utilization of solid waste.

[0027] In some embodiments, the dewatering section 31 includes a hydrocyclone 311, which has a hydrocyclone inlet 3111, a hydrocyclone outlet 3112, and a hydrocyclone overflow 3113. The hydrocyclone inlet 3111 is connected to the outlet of the suction pipe 23. The hydrocyclone 311 can perform swirling sedimentation on the silt. The hydrocyclone outlet 3112 is connected to the inlet of the screening section 32 to discharge heavy phase particles into the inlet of the screening section 32. The hydrocyclone overflow 3113 is used to discharge light phase particles and water. By allowing the silt to enter the hydrocyclone 311 at high speed tangentially, centrifugal force and gravity are used to separate the heavy phase particles from the light phase particles and water. The heavy phase particles are thrown against the wall and sink down and are discharged from the hydrocyclone outlet 3112, while the light phase particles and water rise up and are discharged from the hydrocyclone overflow outlet 3113. This centrifugal dewatering process transforms the material from fluid slurry into loose solid mud blocks.

[0028] In some embodiments, the dewatering section 31 includes a plurality of hydrocyclones 311 connected in series, with the outlet 3112 of the preceding hydrocyclone connected to the inlet 3111 of the following hydrocyclone, to perform multi-stage swirling sedimentation on the sludge, thereby performing multi-stage centrifugal dewatering treatment on the sludge and improving the dryness and looseness of the treated material. Specifically, "preceding" refers to the end near the outlet of the suction pipe 23, and "rearing" refers to the end near the screening section 32.

[0029] In some embodiments, the screening unit 32 includes a three-stage drum screen 321, which includes three screen cylinders arranged sequentially along the front-rear direction of the machine body 1. The three screen cylinders are coaxially arranged, and the screen mesh size of the three screen cylinders gradually increases from front to back. A storage bin 322 is provided at the bottom of each of the three screen cylinders. As the mesh size of the three-stage drum screen 321 gradually increases, when the material after centrifugal dewatering reaches the first screen cylinder, the fine sand in the material is screened out and stored in the storage bin 322 located below the first screen cylinder. When the material reaches the second screen cylinder, the medium sand in the material is screened out and stored in the storage bin 322 located below the second screen cylinder. When the material reaches the third screen cylinder, the coarse sand in the material is screened out and stored in the storage bin 322 located below the third screen cylinder. Finally, large debris (twigs, tree roots, plastic waste, large stones, construction waste) is discharged from the discharge port at the tail of the drum.

[0030] In some embodiments, the amphibious dredging device further includes a cleaning unit 4, which includes a backflushing pipe and a three-way valve 41. The three-way valve 41 includes a first interface, a second interface, and a third interface. The three-way valve 41 is located at one end of the suction pipe 23 near the dewatering and screening unit 3, and both the first and second interfaces are connected to the suction pipe 23. The first interface is closer to the cutting head 21 than the second interface. One end of the backflushing pipe is used to introduce water, and the other end is connected to the third interface. When the three-way valve 41 is in the first state, the first interface is connected to the second interface to transport silt to the dewatering and screening unit 3. When the three-way valve 41 is in the second state, the third interface is connected to the first interface so that water flows sequentially through the suction pipe 23 and the cutting head 21, thereby backflushing the suction pipe 23 and the cutting head 21 to clean the residual mud and sand in the cutting head 21 and the suction pipe 23, and reduce the probability of blockage at the suction pipe 23 or the cutting head 21. In some embodiments, a plug is provided at the third interface, which is rotatably connected to the inner wall of the three-way valve 41. The plug is also connected to the inner wall of the three-way valve 41 by a spring. When the backflushing pipe has not yet been filled with water, the three-way valve 41 is in the first state. At this time, under the constraint of the spring, the plug can block the third interface, so that the first interface and the second interface are connected. At this time, the sludge is transported to the dewatering screening unit 3 through the suction pipe 23. When backflushing is required, water is introduced into the end of the backflushing pipe. Under the action of water pressure, the spring force is overcome, causing the plug to rotate and block the second interface. The three-way valve 41 is in the second state, and the third interface is connected to the first interface, so that water flows through the suction pipe 23 and the cutting head 21 in sequence, thereby backflushing the suction pipe 23 and the cutting head 21. In some embodiments, the cleaning unit 4 further includes a water storage tank and a water pump. The water storage tank is connected to the third port of the three-way valve 41 through a backflush pipe. The water storage tank stores water, and a water pump is installed on the backflush pipe to pump the water in the water storage tank to the third port.

[0031] In some embodiments, the amphibious dredging device also includes a self-stabilizing unit 5. Two self-stabilizing units 5 are symmetrically arranged on both sides of the body 1. The self-stabilizing unit 5 includes a gravity body 52, a lead screw 51, and a guide rod. The lead screw 51 and the guide rod are arranged parallel to each other along the front-back direction of the body 1. The gravity body 52 is sleeved on the lead screw 51 and the guide rod. The gravity body 52 is threadedly engaged with the lead screw 51. The lead screw 51 can rotate around its own axis so that the gravity body 52 moves back and forth along the body 1. As the silt is dewatered and screened, more and more material will be stored in the storage bins 322 at the bottom of each screen cylinder. The weight added to each storage bin 322 will be different depending on the particle size of the material. By moving the gravity body 52 back and forth along the body 1, the position of the center of gravity of the amphibious dredging device is adjusted, thereby improving the stability of the amphibious dredging device during dredging operations or movement. In some embodiments, a second drive motor is provided at the end of the lead screw 51, and the output shaft of the second drive motor is fixedly connected to the end of the lead screw 51 to drive the lead screw 51 to rotate around its own axis.

[0032] In some embodiments, the amphibious dredging device further includes a drive unit 6, which includes a ground walking part 61 and an underwater moving part. The ground walking part 61 includes triangular track walking mechanisms 611 symmetrically arranged on both sides of the body 1 to drive the body 1 to walk on the ground. The underwater moving part includes a propeller 621 arranged on the rear side of the body 1 to drive the body 1 to move underwater.

[0033] In some embodiments, there are four triangular track walking mechanisms 611, symmetrically arranged in pairs on both sides of the body 1. A second drive motor is installed inside the body 1. Each triangular track walking mechanism 611 includes a support frame, a track, a drive wheel, four support wheels, and two tension wheels. The drive wheel is located at the top of the support frame, and the support wheels and tension wheels are located at the bottom of the support frame. The four support wheels are located between the two tension wheels. The track is sleeved on the outside of the drive wheel, tension wheels, and support wheels. The output shaft of the third drive motor is fixedly connected to the axis of the drive wheel, so that the drive wheel can be driven to rotate around the axis through the third drive motor, and further drive each tension wheel and each support wheel to rotate through the track. By setting the tension wheels, the track tension is ensured, and the phenomenon of track slippage or slippage is reduced.

[0034] In some embodiments, the amphibious dredging device further includes a control unit. The control unit is signal-connected to the cutting and suction unit 2 to control the cutting and suction unit 2 to cut the underwater sediment and transport the cut sediment to the dewatering and screening unit 3. The control unit is also signal-connected to the dewatering and screening unit 3 to centrifuge and dewater the sediment and then screen it according to particle size. The control unit is signal-connected to the cleaning unit 4 to periodically backflush the suction pipe 23 and the cutting head 21 when they are blocked. The control unit is signal-connected to the self-stabilizing unit 5 to adjust the center of gravity of the amphibious dredging device, improving its stability during dredging operations or movement. The control unit is signal-connected to the drive unit 6 to drive the body 1 to move on land or underwater. In some embodiments, the controller is also signal-connected to an image acquisition device. The controller includes a receiving end and a transmitting end. The receiving end receives control signals from a computer on the water or land, and the transmitting end transmits the signals acquired by the image acquisition device to the computer on the water or land. In some embodiments, a storage battery is also provided inside the machine body 1. The storage battery is electrically connected to the controller, the cutting and suction unit 2, the dewatering and screening unit 3, the cleaning unit 4, the self-stabilizing unit 5, and the drive unit 6.

[0035] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An amphibious dredging device, characterized in that: The device includes a main body, a cutting and suction unit, and a dewatering and screening unit. The main body is capable of moving on land or underwater. One end of the cutting and suction unit is connected to the main body, and the other end is used to cut and suction the silt. The dewatering and screening unit is installed inside the main body. The inlet of the dewatering and screening unit is connected to the outlet of the cutting and suction unit to receive the silt. The dewatering and screening unit can dewater and screen the silt and store it inside the main body.

2. The amphibious dredging device according to claim 1, characterized in that: The shredding and suction unit includes a shredding head, a robotic arm, and a suction pipe. One end of the robotic arm is connected to the machine body, and the other end is fixedly connected to the shredding head. The shredding head can shred the sediment at the bottom of the water. The inlet of the suction pipe is located on the side of the shredding head near the machine body, and the outlet of the suction pipe is connected to the feed inlet of the dewatering and screening unit. The suction pipe can transport the sediment shredded by the shredding head to the dewatering and screening unit.

3. The amphibious dredging device according to claim 2, characterized in that: The dewatering and screening unit includes a dewatering section and a screening section. The outlet of the suction pipe is connected to the inlet of the dewatering section, and the outlet of the dewatering section is connected to the inlet of the screening section. The dewatering section can centrifuge and dewater the sludge, and the screening section can screen the sludge according to the particle size.

4. The amphibious dredging device according to claim 3, characterized in that: The dewatering section includes a hydrocyclone with a hydrocyclone inlet, a hydrocyclone outlet, and a hydrocyclone overflow. The hydrocyclone inlet is connected to the outlet of the suction pipe. The hydrocyclone can swirl and settle the sediment. The hydrocyclone outlet is connected to the inlet of the screening section to discharge heavy phase particles. The hydrocyclone overflow is used to discharge light phase particles and water.

5. The amphibious dredging device according to claim 4, characterized in that: The dewatering section includes multiple hydrocyclones connected in series, with the outlet of the previous hydrocyclone connected to the inlet of the next hydrocyclone to perform multi-stage swirling sedimentation on the silt.

6. The amphibious dredging device according to claim 3, characterized in that: The screening section includes a three-stage drum screen, which includes three screen cylinders arranged sequentially along the front and rear direction of the machine body. The three screen cylinders are coaxially arranged, and the screen mesh diameter of the three screen cylinders gradually increases from front to back. A storage bin is provided at the bottom of each of the three screen cylinders.

7. The amphibious dredging device according to claim 2, characterized in that: The amphibious dredging device further includes a cleaning unit, which includes a backflushing pipe and a three-way valve. The three-way valve includes a first interface, a second interface, and a third interface. The three-way valve is located at one end of the suction pipe near the dewatering and screening unit, and both the first interface and the second interface are connected to the suction pipe. The first interface is closer to the cutting head than the second interface. One end of the backflushing pipe is used to introduce water, and the other end is connected to the third interface. When the three-way valve is in the first state, the first interface is connected to the second interface to deliver silt to the dewatering and screening unit. When the three-way valve is in the second state, the third interface is connected to the first interface to allow water to flow sequentially through the suction pipe and the cutting head.

8. The amphibious dredging device according to claim 7, characterized in that: The amphibious dredging device also includes a self-stabilizing unit. Two self-stabilizing units are symmetrically arranged on both sides of the body. Each self-stabilizing unit includes a gravity body, a lead screw, and a guide rod. The lead screw and the guide rod are arranged parallel to each other along the front-back direction of the body. The gravity body is sleeved on the lead screw and the guide rod. The gravity body is threadedly engaged with the lead screw. The lead screw can rotate around its own axis so that the gravity body can move back and forth along the body.

9. The amphibious dredging device according to claim 8, characterized in that: The amphibious dredging device also includes a drive unit, which includes a ground walking part and an underwater moving part. The ground walking part includes triangular track walking mechanisms symmetrically arranged on both sides of the body to drive the body to walk on the ground. The underwater moving part includes a propeller arranged on the rear side of the body to drive the body to move underwater.

10. The amphibious dredging device according to claim 9, characterized in that: The amphibious dredging device also includes a control unit, which is signal-connected to the cutting and suction unit, the dewatering and screening unit, the washing unit, the self-stabilizing unit, and the driving unit.

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