Riverbed underwater sand dredging device, dredging system and dredging method

Abstract

The invention provides a riverbed underwater sand dredging device, a dredging system and a dredging method, and relates to the technical field of underwater dredging, the riverbed underwater sand dredging device comprises a base, a vibration platform, a vibration isolation mechanism, a vibration part, a drill rod and a swing mechanism, the base is provided with a hoisting position, and the hoisting position is used for being connected with hoisting equipment on a ship so that the base can be put down and lifted up in water; the vibration platform is arranged on the base; the vibration isolation mechanism is arranged between the base and the vibration platform. According to the riverbed underwater sand dredging device, the dredging system and the dredging method, the vibration part and the rotating mechanism are arranged, so that the drill rod can be inserted into silt before dredging operation, meanwhile, high-pressure water and high-pressure air jet flow is formed through the jet flow channel and the jet flow end, solid, liquid and gas three-phase flow disturbance is combined with the composite vibration fluidization effect, and the dredging efficiency is improved. And the fluidization disturbance of the silt is realized, so that the silt is loosened and fluidized, the efficiency of the desilting operation is improved, and meanwhile, the deposited silt is cleaned more thoroughly and effectively.

Description

Technical Field

[0001] The present invention relates to the technical field of underwater dredging, and in particular to an underwater riverbed sand dredging device, a dredging system and a dredging method. Background Art

[0002] River sedimentation is a common natural phenomenon, mainly caused by the following factors: First, sediment comes from erosion in the upper reaches of the river. When the river flows through the upper mountainous or hilly areas, the water erodes the riverbed and riverbank, producing a large number of sediment particles, which move downstream with the water flow. Secondly, the change in river flow speed is a key factor in sedimentation. When the river flow slows down, such as when it enters the plain area or the river channel widens, the carrying capacity of the water flow decreases, and the sediment is deposited to form siltation. In addition, due to irrigation, heavy rainfall, industrial drainage and other reasons, the silt in rivers, dams and other water systems will increase day by day. The accumulation of silt will cause the riverbed to rise and the water cross-section to decrease, affecting the flood discharge function of the river. At the same time, the accumulated silt contains a large amount of pollutants, which are released into the water body over time to form secondary pollution.

[0003] Silt accumulation can cause the narrowing of river channels, hinder the flow of river water, and easily cause floods. At the same time, it can reduce the depth of river channels, affect the passage of ships, and threaten shipping safety and efficiency. Silt accumulation can also change the riverbed morphology and water flow characteristics, affect the habitat of aquatic organisms, and destroy the ecological balance. Considering the needs of flood control, water transportation, and environmental protection, it is necessary to regularly dredge the riverbeds of some waters.

[0004] At present, the mainstream and effective dredging method is to use dredgers or other mechanical equipment to remove the silt deposited in the river channel, such as the underwater dredging system with publication number CN112663707A, which uses an underwater robot to collect silt through a mechanical arm and a working cover. However, for some compacted silt, the suction efficiency is low and it is difficult to clean it thoroughly, resulting in a long operation time during the regional cleaning process. At the same time, the time interval between each cleaning is short, which is not conducive to the control of river dredging costs. Summary of the invention

[0005] In view of this, the present invention proposes an underwater riverbed dredging device, a dredging system and a dredging method. By arranging a vibration part and a rotating mechanism, the drill rod can be inserted into the mud before the dredging operation. At the same time, high-pressure water and high-pressure air jets are formed through the jet channel and the jet end, and the solid, liquid and gas three-phase flow disturbance is combined with the composite vibration fluidization effect to achieve fluidization disturbance of the mud, loosen the mud and fluidize it, so as to improve the efficiency of the dredging operation. At the same time, the cleaning of the accumulated mud is made more thorough and effective.

[0006] The technical solution of the present invention is achieved in this way:

[0007] On the one hand, the present invention provides a riverbed underwater sand dredging device, comprising a base, a vibration platform, a vibration isolation mechanism, a vibration part, a drill rod and a rotary mechanism, wherein:

[0008] The base is provided with a lifting position, which is used to connect the lifting equipment on the ship to lower and lift the base in the water;

[0009] The vibration platform is arranged on a base;

[0010] The vibration isolation mechanism is arranged between the base and the vibration platform, and the base and the vibration platform are connected through the vibration isolation mechanism to isolate the vibration transmitted from the vibration platform to the base;

[0011] The vibration part is fixed on the vibration platform, and the vibration part is used to drive the vibration platform to vibrate;

[0012] The drill rod is rotatably arranged on the vibration platform and can vibrate along with the vibration platform. The two ends of the drill rod are a connecting end and a jet end respectively, and a jet channel is opened on the drill rod. The jet channel connects the connecting end and the jet end. The connecting end is used to connect a ship to supply high-pressure water and high-pressure air into the jet channel. The jet end is used to be inserted into the silted mud of the riverbed to form high-pressure water and high-pressure air jets.

[0013] The slewing mechanism is arranged on the vibration platform and is transmission-connected with the drill rod. The slewing mechanism is used for driving the drill rod to rotate on the vibration platform.

[0014] On the basis of the above technical solution, preferably, the base includes a connecting frame and a hanging frame, wherein:

[0015] The connecting frame is connected to the vibration platform;

[0016] There are two hanging frames, which are symmetrically arranged on the connecting frame, and a single hanging frame has two hanging positions.

[0017] On the basis of the above technical solution, preferably, the vibration isolation mechanism includes two base plates, two arc-shaped plates and an elastic member, wherein:

[0018] The two substrates are fixed on the base and the vibration platform respectively, and the two substrates are located between the base and the vibration platform and are arranged opposite to each other;

[0019] The two ends of the arc plate are respectively fixed to the sides of the two base plates, the two arc plates are symmetrically arranged on the two sides of the elastic member, and the two arc plates have elastic deformation capability;

[0020] Two ends of the elastic member are respectively fixed to the two substrates so as to perform elastic deformation between the two substrates.

[0021] On the basis of the above technical solution, preferably, the vibration platform includes a horizontal plate and two vertical plates, wherein:

[0022] The horizontal plate is arranged on the base through a vibration isolation mechanism, the horizontal plate is arranged in a square shape, and the number of the vibration isolation mechanisms is four and they are distributed on the four corners of the horizontal plate;

[0023] The two vertical plates are parallel to each other and symmetrically arranged on the horizontal plate.

[0024] Further preferably, the number of the vibration parts is two, and they are respectively fixed on two vertical plates, the two vibration parts are symmetrically arranged, and the drill rod and the rotary mechanism are arranged on a horizontal plate and located between the two vertical plates.

[0025] On the basis of the above technical solution, preferably, the drill rod comprises a main rod and a connecting part, wherein:

[0026] The main rod is arranged on the vibration platform and can rotate relative to the vibration platform, one end of the main rod is a jet end, and the jet channel is arranged in the main rod;

[0027] The connecting part is arranged on a side of the main rod away from the jet end and can rotate relative to the main rod, and the connecting end is arranged on the connecting part.

[0028] A dredging system comprises a working boat, a crane, a silt collecting device and the above-mentioned riverbed underwater dredging device, wherein:

[0029] The crane is arranged on the working ship, and the base hoisting device is arranged on the lifting end of the crane so as to lower the base into the water by the crane;

[0030] The sediment collection device is arranged on the working boat and has a sediment collection end, wherein the sediment collection end is used to be lowered into the water to collect the sediment loosened by the underwater sediment dredging device on the riverbed and pump it to the working boat.

[0031] On the basis of the above technical solution, preferably, it further comprises an air compressor and a high-pressure water pump, and the output ends of the air compressor and the high-pressure water pump are both connected to the jet channel on the drill pipe.

[0032] On the basis of the above technical solution, preferably, the sediment collection device includes a separator, a collection head and a delivery pump, wherein:

[0033] The separator is fixed on the work boat and is used to grade and separate the silt;

[0034] The collecting head is connected to the separator through a pipeline so as to send the collected sediment into the separator;

[0035] The delivery pump is arranged on the pipeline connecting the collection head and the separator, and the delivery pump is used to form negative pressure in the collection head and pump the silt entering the pipeline.

[0036] A riverbed dredging method is implemented based on the above-mentioned dredging system, and the riverbed dredging method comprises the following steps:

[0037] S1 drives the work boat to the riverbed of the water area to be desilted;

[0038] S2 uses a crane to lower the base to the part that needs to be cleaned;

[0039] The S3 drill pipe is vibrated and sunk by the vibrating part, and the rotary mechanism drives the drill pipe to rotate synchronously, and the high-pressure air and high-pressure water sprayed from the jet end of the drill pipe are used to loosen and fluidize the sediment;

[0040] S4 lifts the base and sends the sediment collection device to a position where the sediment is loosened and fluidized, so that the sediment collection end performs sediment collection operations.

[0041] The riverbed underwater dredging device, dredging system and dredging method of the present invention have the following beneficial effects compared with the prior art:

[0042] (1) By setting up a vibration part and a rotary mechanism, the drill rod can be inserted into the mud before the dredging operation, and at the same time, high-pressure water and high-pressure air jets are formed through the jet channel and the jet end, and the solid, liquid and gas three-phase flow disturbance is combined with the composite vibration fluidization effect to achieve fluidization disturbance of the mud, so that the mud is loosened and fluidized, thereby improving the efficiency of the dredging operation and making the silt cleaning more thorough and effective;

[0043] (2) A sediment collection device is set up, and the riverbed underwater sediment dredging device and the sediment collection device are simultaneously set up on the same work boat, so that after the riverbed underwater sediment dredging device loosens the sediment in the target area, the sediment collection device directly collects the fluidized sediment, thereby achieving sediment loosening and collection at the same time, further improving dredging efficiency and reducing time and operation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 It is a three-dimensional diagram of the riverbed underwater sand dredging device of the present invention;

[0046] Figure 2It is a three-dimensional diagram of the riverbed underwater sand dredging device of the present invention from another perspective;

[0047] Figure 3 A three-dimensional diagram of a vibration platform of a riverbed underwater sand dredging device according to the present invention;

[0048] Figure 4 A three-dimensional diagram of the vibration isolation mechanism of the riverbed underwater sand dredging device of the present invention;

[0049] Figure 5 It is a schematic diagram of the connection between the drill rod and the rotary mechanism of the riverbed underwater sand dredging device of the present invention;

[0050] Figure 6 The structure of the dredging system of the present invention is schematically shown. DETAILED DESCRIPTION

[0051] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] like Figure 1-5 As shown, the riverbed underwater sand dredging device of the present invention includes a base 1, a vibration platform 2, a vibration isolation mechanism 3, a vibration part 4, a drill rod 5 and a rotary mechanism 6.

[0053] The base 1 is provided with a lifting position, which is used to connect the lifting equipment on the ship to lower and lift the base 1 in the water. Specifically, the base 1 is made of a steel frame structure as a whole, and no plate is installed on the outside to reduce the resistance during the underwater lifting process and increase the lifting speed. At the same time, the base 1 is preferably a symmetrical structure to ensure that the drill rod 5 can always be kept facing downward during the rapid lowering process. Accordingly, in order to ensure good stability during lifting, there are preferably four lifting positions, and the steel rope is directly connected through the four lifting positions to form a connection with the lifting equipment.

[0054] The vibration platform 2 is arranged on the base 1. On the base 1, there is a mounting plane. The vibration platform 2 is arranged on the mounting plane and is located in the middle position thereof. The vibration platform 2 is used for vibration transmission to realize the impact and sinking action of the drill rod 5. However, it is meaningless to transmit the vibration to the base 1, and it will affect the structural stability of the base 1 and the connection stability of the lifting equipment. Therefore, in this embodiment, a vibration isolation mechanism 3 is required to prevent the vibration of the vibration platform 2 from being transmitted to the base 1.

[0055] The vibration isolation mechanism 3 is arranged between the base 1 and the vibration platform 2. The base 1 and the vibration platform 2 are connected through the vibration isolation mechanism 3 to isolate the vibration transmitted from the vibration platform 2 to the base 1. The vibration isolation mechanism 3 itself has a certain elastic deformation ability and a certain rigidity. The vibration transmission is isolated by the deformation of the vibration isolation mechanism 3. At the same time, its own rigidity is used to connect the base 1 and the vibration platform 2, and then the device is protected by the vibration isolation mechanism 3 and the stability of the device is improved.

[0056] The vibration part 4 is fixed on the vibration platform 2, and the vibration part 4 is used to drive the vibration platform 2 to vibrate. The vibration part 4 is preferably a vibration motor, and it needs to have good waterproof performance so that it can realize underwater vibration operation. In addition, considering that the vibration part 4 cannot be directly set on the same straight line as the drill rod 5, and the vibration impact capacity of a single vibration part 4 is limited, two vibration parts 4 are set and symmetrically arranged on both sides of the drill rod 5 to achieve more efficient impact sinking, while placing one side heavier, causing the drill rod 5 to tilt during the impact.

[0057] The drill rod 5 is rotatably arranged on the vibration platform 2 and can vibrate along with the vibration platform 2. The two ends of the drill rod 5 are a connecting end and a jet end respectively, and a jet channel is opened on the drill rod 5. The jet channel connects the connecting end and the jet end. The connecting end is used to connect a ship to supply high-pressure water and high-pressure air into the jet channel. The jet end is used to be inserted into the silted mud on the riverbed to form high-pressure water and high-pressure air jets.

[0058] The rotary mechanism 6 is arranged on the vibration platform 2 and is connected to the drill rod 5 in a transmission manner. The rotary mechanism 6 is used to drive the drill rod 5 to rotate on the vibration platform 2. The drill rod 5 is driven to rotate by the rotary mechanism 6, so that the high-pressure water and high-pressure air jets on the jet end of the drill rod 5 can be rotated and sprayed, forming a multi-directional impact on the mud and sand in the inserted part, further improving the fluidization disturbance effect on the mud and sand.

[0059] In this embodiment, by providing the vibration part 4 and the rotating mechanism 6, the drill rod 5 can be inserted into the mud before the dredging operation. At the same time, high-pressure water and high-pressure air jets are formed through the jet channel and the jet end, and the solid, liquid and gas three-phase flow disturbance is combined with the composite vibration fluidization effect to achieve fluidization disturbance of the mud, loosen the mud and fluidize it, so as to improve the efficiency of the dredging operation and, at the same time, make the cleaning of the accumulated mud more thorough and effective.

[0060] The base 1 includes a connecting frame 11 and a hanging frame 12. The connecting frame 11 is connected to the vibration platform 2. There are two hanging frames 12, which are symmetrically arranged on the connecting frame 11. A single hanging frame 12 has two hanging positions.

[0061] The connecting frame 11 is square in shape, and a number of C-shaped steels are arranged inside, dividing the interior of the connecting frame 11 into a plurality of triangular structures to achieve structural stability and avoid large resistance of the water body during the lifting process. The hoisting frame 12 is H-shaped, and two C-shaped steels are arranged on the side for structural reinforcement to ensure stability during lifting and avoid structural deformation.

[0062] As a preferred embodiment, the vibration isolation mechanism 3 includes two substrates 31, two arc plates 32 and an elastic member 33. The two substrates 31 are respectively fixed on the base 1 and the vibration platform 2, and the two substrates 31 are located between the base 1 and the vibration platform 2 and are arranged opposite to each other. The two ends of the arc plates 32 are respectively fixed to the sides of the two substrates 31. The two arc plates 32 are symmetrically arranged on both sides of the elastic member 33, and the two arc plates 32 have elastic deformation capabilities. The two ends of the elastic member 33 are respectively fixed to the two substrates 31 to perform elastic deformation between the two substrates 31.

[0063] The elastic member 33 is preferably a spring, the substrate 31 is U-shaped, and the open sides of the two substrates 31 are opposite to each other. A convex column is provided inside the substrate 31, and the elastic member 33 is fixed between the two substrates 31 through the two convex columns of the two substrates 31. Specifically, the two ends of the elastic member 33 are respectively mounted on the two convex columns, and the arc plate 32 is fixed to the substrate 31 by bolts.

[0064] The vibration platform 2 includes a transverse plate 21 and two vertical plates 22. The transverse plate 21 is arranged on the base 1 through a vibration isolation mechanism 3. The transverse plate 21 is arranged in a square shape. The number of the vibration isolation mechanisms 3 is four and distributed on the four corners of the transverse plate 21. The two vertical plates 22 are parallel to each other and symmetrically arranged on the transverse plate 21.

[0065] In order to enhance the connection strength between the vertical plate 22 and the horizontal plate 21, a reinforcing plate is provided on the outer side of the vertical plate 22 and the horizontal plate 21, and the reinforcing plate forms a stable triangular support structure between the vertical plate 22 and the horizontal plate 21, and connects the vertical plate 22 and the horizontal plate 21 by welding.

[0066] Correspondingly, there are two vibration parts 4 , which are fixed on two vertical plates 22 respectively. The two vibration parts 4 are symmetrically arranged. The drill rod 5 and the rotary mechanism 6 are arranged on the horizontal plate 21 and are located between the two vertical plates 22 .

[0067] Two cross beams are provided between the two vertical plates 22 to support the two vertical plates 22 to prevent the vertical plates 22 from deformation. The two symmetrically arranged vibration parts 4 can improve the impact sinking efficiency of the drill rod 5 and balance the weight on both sides of the vibration platform 2.

[0068] In this embodiment, the drill rod 5 includes a main rod 51 and a connecting portion 52. The main rod 51 is arranged on the vibration platform 2 and can rotate relative to the vibration platform 2. One end of the main rod 51 is a jet end, and the jet channel is arranged in the main rod 51. The connecting portion 52 is arranged on a side of the main rod 51 away from the jet end and can rotate relative to the main rod 51. The connecting end is arranged on the connecting portion 52.

[0069] At the bottom end of the main rod 51, a conical structure is provided to reduce the resistance of the drill rod 5 when it impacts and sinks. At the same time, above the conical structure, a water-gas concentric nozzle and a high-pressure water jet nozzle are arranged, wherein the high-pressure air pressure jet pressure is preferably about 1Mpa, and the pressure of the high-pressure water is preferably 20-30Mpa.

[0070] During use, the connecting portion 52 can be directly fixed relative to the base 1 through pipelines or other structures to prevent the air and water supply pipelines from rotating along with the main rod 51 .

[0071] The rotating mechanism 6 includes a rotating motor, which is connected to the main rod 51 through a transmission belt or gears. At least two bearings connected to the vibration platform 2 are arranged on the outside of the main rod 51 to reduce the rotational resistance. It should be noted that a waterproof shell needs to be arranged on the outside of the transmission structure.

[0072] like Figure 1-6 As shown, the dredging system of the present invention comprises a working boat 10, a crane 20, a silt collecting device 30 and the above-mentioned riverbed underwater dredging device.

[0073] The crane 20 is disposed on the work boat 10 , and the base 1 is hoisted and disposed on a lifting end of the crane 20 , so that the base 1 can be lowered into the water by the crane 20 .

[0074] It should be noted that the lifting end of the crane 20 needs to extend to the outside of the workboat 10, and the base 1 is hoisted by a steel rope and a hook to enable the riverbed underwater dredging device to sink under the action of gravity, or to be hoisted by the crane 20.

[0075] The sediment collection device 30 is disposed on the work boat 10 and has a sediment collection end, which is used to be lowered into the water to collect the sediment loosened by the underwater sediment dredging device on the riverbed and pump it to the work boat 10 .

[0076] The sediment collection device 30 can be operated underwater by installing another lifting device on the ship, or adopt a structure similar to an underwater walking robot to move in an environment such as a riverbed and a reservoir, thereby realizing the collection of loose sediment.

[0077] In order to allow high-pressure water and high-pressure air to be delivered into the drill pipe 5, an air compressor 40 and a high-pressure water pump 50 are also provided on the work boat 10. The output ends of the air compressor 40 and the high-pressure water pump 50 are both connected to the jet channel on the drill pipe 5. The high-pressure gas is delivered to the drill pipe 5 through the air compressor 40, and the high-pressure water is delivered to the drill pipe 5 through the high-pressure water pump 50.

[0078] In addition, in order to enable the water and gas pipelines to move up and down with the base 1, a reel is also provided on the work boat 10. The water and gas pipelines are wound on different reels and can be reeled in by a motor on the reel.

[0079] As a preferred embodiment, the sediment collection device 30 includes a separator 301, a collection head 302 and a delivery pump 303. The separator 301 is fixed on the workboat 10 and is used to grade and separate the sediment. The collection head 302 is connected to the separator 301 through a pipeline to deliver the collected sediment into the separator 301. The delivery pump 303 is arranged on the pipeline connecting the collection head 302 and the separator 301. The delivery pump 303 is used to form a negative pressure in the collection head 302 and pump the sediment entering the pipeline.

[0080] The collecting head 302 adopts a grid separation structure to perform preliminary separation of sediments with different particle sizes, and transports them to the separator 301 through the delivery pump 303. The separator 301 then performs classification processing through vibration screening and other methods to separate sediments with different particle sizes.

[0081] The riverbed dredging method of the present invention is implemented based on the above-mentioned dredging system, and the riverbed dredging method includes steps S1-S4.

[0082] Step S1: The working boat 10 is driven to the riverbed of the water area to be desilted.

[0083] Before the dredging operation, the dredging area needs to be determined, such as the water inlet of the reservoir, and then the workboat 10 is driven above the water surface of the area. It should be noted that the dredging area can be determined according to environmental conditions, or determined by exploration by an underwater robot.

[0084] Step S2: lower the base 1 to the part to be cleaned by the crane 20.

[0085] The crane 20 lowers the steel cable to move the base 1 downward in the water under the action of gravity. During this process, the lowering speed can be controlled to prevent the base 1 from being skewed to a large extent, thereby affecting the subsequent sand dredging operation.

[0086] Step S3: the drill rod 5 is vibrated and sunk by the vibrating part 4, and the drill rod 5 is rotated by the rotary mechanism 6 synchronously, and the high-pressure air and high-pressure water ejected from the jet end of the drill rod 5 are used to loosen and fluidize the mud and sand.

[0087] In this step, the drill rod 5 has been inserted into the silt that needs to be dredged and desilted, and the silt near the drill rod 5 is quickly loosened by combining vibration sinking with rotary high-pressure jetting.

[0088] Step S4: lift the base 1 and send the sediment collection device 30 to the position where the sediment is loosened and fluidized, so that the sediment collection end performs sediment collection operation.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A riverbed underwater sand dredging device, characterized in that: It comprises a base (1), a vibration platform (2), a vibration isolation mechanism (3), a vibration part (4), a drill rod (5) and a rotary mechanism (6), wherein: The base (1) is provided with a lifting position, which is used to connect to a lifting device on a ship so as to lower and lift the base (1) in water; The vibration platform (2) is arranged on the base (1); The vibration isolation mechanism (3) is arranged between the base (1) and the vibration platform (2), and the base (1) and the vibration platform (2) are connected via the vibration isolation mechanism (3) to isolate the vibration transmitted from the vibration platform (2) to the base (1); The vibration part (4) is fixed on the vibration platform (2), and the vibration part (4) is used to drive the vibration platform (2) to vibrate; The drill rod (5) is rotatably arranged on the vibration platform (2) and can vibrate along with the vibration platform (2). The two ends of the drill rod (5) are respectively a connecting end and a jet end. A jet channel is provided on the drill rod (5). The jet channel connects the connecting end and the jet end. The connecting end is used to connect a ship so as to supply high-pressure water and high-pressure air into the jet channel. The jet end is used to be inserted into the silted mud of the riverbed to form high-pressure water and high-pressure air jets. The slewing mechanism (6) is arranged on the vibration platform (2) and is transmission-connected to the drill rod (5); the slewing mechanism (6) is used to drive the drill rod (5) to rotate on the vibration platform (2).

2. The riverbed underwater sand dredging device according to claim 1, characterized in that: The base (1) comprises a connecting frame (11) and a hanging frame (12), wherein: The connecting frame (11) is connected to the vibration platform (2); There are two hanging frames (12) which are symmetrically arranged on the connecting frame (11), and each hanging frame (12) has two hanging positions.

3. The riverbed underwater sand dredging device according to claim 1, characterized in that: The vibration isolation mechanism (3) comprises two base plates (31), two arc-shaped plates (32) and an elastic member (33), wherein: The two substrates (31) are respectively fixed on the base (1) and the vibration platform (2), and the two substrates (31) are both located between the base (1) and the vibration platform (2) and are arranged opposite to each other; The two ends of the arc-shaped plate (32) are respectively fixed to the side surfaces of the two base plates (31); the two arc-shaped plates (32) are symmetrically arranged on the two sides of the elastic member (33); and the two arc-shaped plates (32) both have elastic deformation capability; Two ends of the elastic member (33) are respectively fixed to the two substrates (31) so as to be elastically deformed between the two substrates (31).

4. The riverbed underwater sand dredging device according to claim 1, characterized in that: The vibration platform (2) comprises a horizontal plate (21) and two vertical plates (22), wherein: The transverse plate (21) is arranged on the base (1) via a vibration isolation mechanism (3); the transverse plate (21) is arranged in a square shape; the number of the vibration isolation mechanisms (3) is four and they are distributed at the four corners of the transverse plate (21); The two vertical plates (22) are parallel to each other and symmetrically arranged on the horizontal plate (21).

5. The riverbed underwater sand dredging device according to claim 4, characterized in that: The number of the vibration parts (4) is two, and they are fixed on two vertical plates (22) respectively. The two vibration parts (4) are symmetrically arranged. The drill rod (5) and the rotary mechanism (6) are arranged on a horizontal plate (21) and are located between the two vertical plates (22).

6. The riverbed underwater sand dredging device according to claim 1, characterized in that: The drill rod (5) comprises a main rod (51) and a connecting portion (52), wherein: A main rod (51) is arranged on the vibration platform (2) and can rotate relative to the vibration platform (2); one end of the main rod (51) is a jet end, and a jet channel is arranged in the main rod (51); The connecting portion (52) is arranged on a side of the main rod (51) away from the jet end and is rotatable relative to the main rod (51), and the connecting end is arranged on the connecting portion (52).

7. A dredging system, characterized in that: The invention comprises a working boat (10), a crane (20), a sediment collecting device (30) and a riverbed underwater sediment dredging device according to any one of claims 1 to 6, wherein: The crane (20) is arranged on the working boat (10), and the base (1) is hoisted and arranged on the lifting end of the crane (20), so that the base (1) can be lowered into the water by the crane (20); The sediment collection device (30) is arranged on the working boat and has a sediment collection end, wherein the sediment collection end is used to be lowered into the water to collect the sediment loosened by the underwater sediment dredging device on the riverbed and pump it to the working boat (1).

8. The dredging system according to claim 7, characterized in that: It also includes an air compressor (40) and a high-pressure water pump (50), wherein the output ends of the air compressor (40) and the high-pressure water pump (50) are both connected to the jet channel on the drill rod (5).

9. The dredging system according to claim 7, characterized in that: The sediment collection device (30) comprises a separator (301), a collection head (302) and a delivery pump (303), wherein: The separator (301) is fixed on the working boat (10) and is used for classifying and separating the silt; The collecting head (302) is connected to the separator (301) through a pipeline so as to send the collected sediment into the separator (301); The delivery pump (303) is arranged on the pipeline connecting the collection head (302) and the separator (301), and the delivery pump (303) is used to form a negative pressure in the collection head (302) and pump the silt entering the pipeline.

10. A riverbed dredging method, characterized in that: Based on the dredging system according to any one of claims 7 to 9, the riverbed dredging method comprises the following steps: S1: driving the working boat (10) to the riverbed of the water area to be desilted; S2 lowers the base (1) to the part to be cleaned by means of a crane (20); S3 The drill rod (5) is vibrated and sunk by the vibrating part (4), and the rotary mechanism (6) drives the drill rod (5) to rotate synchronously, and the high-pressure air and high-pressure water ejected from the jet end of the drill rod (5) are used to loosen and fluidize the sediment; S4 lifts the base (1) and sends the sediment collection device (30) to a position where the sediment is loosened and fluidized, so that the sediment collection end performs sediment collection operations.

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