Overwater dredging device for substandard water body

Abstract

An overwater desilting device for substandard water is characterized by comprising a desilting ship body, a silt cleaning unit, a filtering unit, a pushing unit, a transporting unit and a folding bridge unit; the silt cleaning unit, the filtering unit, the pushing unit, the transporting unit and the folding bridge unit are fixed to the dredger body and can move along with the dredger body, and therefore dredging treatment can be conducted on multiple places; moreover, the silt cleaning unit, the filtering unit, the pushing unit, the conveying unit and the folding bridge unit are arranged in an assembly line mode, silt removing, filtering and conveying are integrated, the whole process is mostly automatically carried out, manual intervention is reduced, and the silt removing efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of water silt removal, and in particular to a water silt removal device for substandard water bodies. Background Art

[0002] Sediment removal is a routine measure for the management of rivers, lakes, and seas. The operation process of this measure is to drain the water in the water body - excavate and clean the sediment - divert water into the water body. Large-scale dredging projects mean that the water habitat of the water body has been completely changed, and the restoration and reconstruction of the water ecological environment system requires a long time. Therefore, in the early stage of the formation of substandard water bodies, especially black and smelly water bodies and water bodies with algal blooms, timely cleaning of local heavily polluted sediments is of great significance for the prevention and control of substandard water pollution.

[0003] Most of the current aquatic dredging devices / equipment used for black and smelly water bodies that do not meet the standards only have the functions of sucking and storing sludge (such as the Chinese utility model patent with application number 202320318326.3 and the name of a river dredging device), but do not have the functions of dredging, filtering, and external transportation, which brings great inconvenience to the dredging work. Summary of the invention

[0004] In view of the above problems, the present invention provides an above-water dredging device for substandard water bodies; a sludge cleaning unit, a filtration unit, a propulsion unit, a transport unit and a folding bridge unit are fixed on the hull of a dredging ship, and can move along with the hull of the dredging ship, so that dredging can be carried out in multiple places; not only that, the sludge cleaning unit, the filtration unit, the propulsion unit, the transport unit and the folding bridge unit are arranged in an assembly line, integrating dredging, filtration and transportation, and the whole process is mostly carried out automatically, which reduces manual intervention and increases dredging efficiency.

[0005] An above-water dredging device for substandard water bodies, comprising: a dredging vessel hull, a sludge cleaning unit, a filtering unit, a pushing unit, a transport unit and a folding bridge unit; A sludge cleaning unit is fixed on a bracket at the bow of the dredging boat hull, and the sludge cleaning unit is arranged on the side of the dredging boat hull. A sludge cleaning unit is arranged in the sludge cleaning unit, and the sludge discharge pipe is fixed on the column of the dredging boat hull. A filter unit is arranged below the sludge discharge pipe, and the filter unit is fixed on the dredging boat hull. A transport unit is arranged behind the filter unit, and four universal wheels in the transport unit are stuck in the groove of the folding bridge unit. A pushing unit is arranged on the side of the transport unit. After the transport unit is filled with sludge, the pushing unit will push the transport unit to move and provide assistance to it. The pushing unit is fixed on the protruding bracket of the dredging boat hull, and the folding bridge unit is fixed at the stern of the dredging boat hull and can be folded and unfolded at any time.

[0006] Furthermore, the sludge cleaning unit comprises: a screw moving subunit, an electric cylinder, a shielding cylinder, a sludge suction pump, a sludge discharge pipe, a motor A, a fixed ring, a fixed sleeve, a stirring blade and an annular internal gear; The screw moving subunit is fixed to the hull of the dredging boat through a bracket, and two electric cylinders are fixed on the slider of the screw moving subunit, and the telescopic end of the electric cylinder is fixed to the top of the shielding cylinder, and a dredge pump is fixed in the middle of the shielding cylinder, and the dredge pump extends into the interior of the shielding cylinder, and the mud outlet of the dredge pump is fixed to the mud discharge pipe, and a fixed ring and a fixed sleeve are fixed to the interior of the shielding cylinder, and the motor A is fixed to the top of the shielding cylinder, and the motor shaft of the motor A passes through the shielding cylinder and the fixed ring and is fixed to a transverse bevel gear, and a plurality of transverse bevel gears and vertical bevel gears are rotatably installed on the fixed ring, and each transverse bevel gear is respectively meshed with a vertical bevel gear, and an annular internal gear is rotatably installed on the fixed ring, and the annular internal gear is meshed with all the transverse bevel gears, and each vertical bevel gear is connected to a stirring blade group through a belt, and each stirring blade group includes two stirring blades, and the stirring blade is rotatably installed on the fixed sleeve.

[0007] Furthermore, the stirring blades are detachably arranged, and when one of the stirring blades is damaged, only one stirring blade can be replaced.

[0008] Further, the filtering unit comprises: a hydraulic cylinder A, a water storage tank, a water outlet pipe, a conveyor belt, a filtering box and a rotating shaft; The bottom of the hydraulic cylinder A is hinged on the hull of the dredging boat, the telescopic end of the hydraulic cylinder A is fixed to the filter box, the water storage box is fixed to the hull of the dredging boat, the end of the water storage box is rotatably installed with a rotating shaft, the rotating shaft is fixed to the end of the filter box, and an opening is provided on the side of the water storage tank, and a water outlet pipe is fixed at the opening.

[0009] Furthermore, the pushing unit comprises: a screw slider group, a connecting rod and a pushing plate; The lead screw slider group is fixed on the protruding bracket of the dredging boat hull. Two sliders are arranged on the dredging boat hull. Each slider is hinged to a connecting rod. The other end of the connecting rod is hinged to a push plate. The middle position of the push plate is slidably mounted on the frame of the lead screw slider group.

[0010] Furthermore, the transport unit comprises: a box body, a turnover box, universal wheels and a hydraulic cylinder B; Four universal wheels are fixed below the box body, the inside of the box body is hinged with a hydraulic cylinder B, the telescopic end of the hydraulic cylinder B is fixed with the flip box, and the end of the flip box is rotatably mounted with the end of the box body.

[0011] Further, the folding bridge unit includes: a motor B, a winding wheel, a bottom plate, a column, a pulley, a wire rope, a first folding plate, a second folding plate, a third folding plate, a fourth folding plate, a first connecting rod, a second connecting rod, a supporting claw and a connecting plate; The bottom plate is fixed on the hull of the dredging boat, and two columns are fixed on the bottom plate, a motor B is fixed at the bottom of each column, the motor shaft of the motor B passes through the column and is fixed to the winding wheel, a pulley is rotatably installed on the top of the column, a steel wire rope is wound on the winding wheel, the steel wire rope passes through the pulley in the middle, and is finally fixed on the second connecting rod, the first folding plate is fixed on the bottom plate, the second folding plate and the front end of the first connecting rod are rotatably installed on the bracket on the bottom plate, the end of the second folding plate is hinged to the front end of the third folding plate, the common rotating shaft of the second folding plate and the third folding plate is fixed to the connecting plate, the end of the first connecting rod and the front end of the second connecting rod are fixed to the connecting plate, the end of the third folding plate is hinged to the fourth folding plate, the common rotating shaft of the third folding plate and the fourth folding plate is fixed to the connecting plate, the end of the second connecting rod is fixed to the connecting plate, and the end of the fourth folding plate is fixed with two supporting claws.

[0012] Furthermore, the hydraulic cylinder A and the hydraulic cylinder B both use telescopic telescopic levers.

[0013] Since the present invention adopts the above technical solution, the present invention has the following advantages: (1) The silt cleaning unit, filtration unit, push unit, transport unit and folding bridge unit are all fixed on the hull of the dredging vessel and can move with the hull of the dredging vessel, so that dredging can be carried out in multiple places. In addition, the silt cleaning unit, filtration unit, push unit, transport unit and folding bridge unit are arranged in an assembly line, integrating dredging, filtration and transportation. The whole process is mostly automated, which reduces manual intervention and increases dredging efficiency; (2) By setting up a sludge cleaning unit, using a stirring blade to disperse the agglomerated sludge, and using a sludge suction pump to suck the sludge away, the sludge can be completely removed and the sludge can be prevented from agglomerating and clogging the sludge suction pump; (3) By setting up a filtration unit and using a filter box, the water in the sludge flows out through the outlet pipe, leaving the solid sludge before dumping it, ensuring that the water in the water body will not be lost; (4) By setting up a pushing unit, a transport unit and a folding bridge unit, and using a pushing plate, a universal wheel and a hydraulic cylinder B, the silt is transported to the ground, saving manpower and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1-2 It is a schematic diagram of the overall structure of the present invention.

[0015] Figure 3-6 It is a schematic structural diagram of the sludge cleaning unit of the present invention.

[0016] Figure 7-8 It is a schematic structural diagram of the filter unit of the present invention.

[0017] Fig. 9 It is a structural schematic diagram of the pushing unit of the present invention.

[0018] Figure 10-11 It is a schematic diagram of the structure of the transport unit of the present invention.

[0019] Figure 12-13 Schematic diagram of the structure of the folded bridge unit of the present invention.

[0020] Figure numbers: 1-hull of dredging boat; 2-sludge cleaning unit; 3-filtering unit; 4-propelling unit; 5-transportation unit; 6-folding bridge unit; 201-screw moving subunit; 202-electric cylinder; 203-shielding cylinder; 204-sludge suction pump; 205-sludge discharge pipe; 206-motor A; 207-fixing ring; 208-fixing sleeve; 209-mixing blade; 210-ring internal gear; 301-hydraulic cylinder A; 302-water storage tank; 303-water outlet pipe; 304-transmission belt; 305-filter box; 3 06-rotating shaft; 401-screw slider group; 402-connecting rod; 403-pushing plate; 501-box; 502-turning box; 503-universal wheel; 504-hydraulic cylinder B; 601-motor B; 602-winding wheel; 603-bottom plate; 604-column; 605-pulley; 606-wire rope; 607-first folding plate; 608-second folding plate; 609-third folding plate; 610-fourth folding plate; 611-first connecting rod; 612-second connecting rod; 613-support claw; 614-connecting plate. DETAILED DESCRIPTION

[0021] The technical solution of the present invention is further specifically described below by way of embodiments and in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0022] like Figure 1-13 As shown, this embodiment is used for water dredging of substandard rivers, and includes: a dredging vessel hull 1, a sludge cleaning unit 2, a filtering unit 3, a pushing unit 4, a transport unit 5 and a folding bridge unit 6; A sludge cleaning unit 2 is fixed on a bracket at the bow position of the hull 1 of the dredging boat. The sludge cleaning unit 2 is arranged on the side of the hull 1 of the dredging boat. A sludge discharge pipe 205 is arranged in the sludge cleaning unit 2. The sludge discharge pipe 205 is fixed on the column of the hull 1 of the dredging boat. A filtering unit 3 is arranged below the sludge discharge pipe 205. The filtering unit 3 is fixed on the hull 1 of the dredging boat. A transport unit 5 is arranged behind the filtering unit 3. Four universal wheels 503 in the transport unit 5 are stuck in the groove of the folding bridge unit 6. A pushing unit 4 is arranged on the side of the transport unit 5. After the transport unit 5 is filled with sludge, the pushing unit 4 will push the transport unit 5 to move and provide assistance for it. The pushing unit 4 is fixed on the extended bracket of the hull 1 of the dredging boat. The folding bridge unit 6 is fixed at the stern position of the hull 1 of the dredging boat and can be folded and unfolded at any time. When the dredging ship hull 1 moves to the location where dredging is required, the sludge cleaning unit 2 stirs the sludge and sucks it into the sludge discharge pipe 205, and then the sludge is discharged from the sludge discharge pipe 205 into the filtering unit 3, the filtering unit 3 removes the moisture in the sludge, and transfers the remaining sludge to the transport unit 5. When the transport unit 5 is full of sludge, the folding bridge unit 6 is opened manually with the help of the folding bridge unit 6, and then the pushing unit 4 pushes the transport unit 5 to move a distance on the folding bridge unit 6, and then the transport unit 5 moves to the ground by its own kinetic energy and dumps the sludge onto the ground beside the river or onto a transport vehicle.

[0023] In an optional implementation manner of the embodiment of the present invention, as Figure 3-6 As shown, the sludge cleaning unit 2 includes: a screw moving subunit 201, an electric cylinder 202, a shielding cylinder 203, a sludge suction pump 204, a sludge discharge pipe 205, a motor A206, a fixed ring 207, a fixed sleeve 208, a stirring blade 209 and a ring internal gear 210; The screw moving subunit 201 is fixed on the hull 1 of the dredging boat through a bracket, and two electric cylinders 202 are fixed on the slider of the screw moving subunit 201. The telescopic end of the electric cylinder 202 is fixed to the top of the shielding cylinder 203, and a dredge pump 204 is fixed in the middle of the shielding cylinder 203. The dredge pump 204 extends into the interior of the shielding cylinder 203, and the mud outlet of the dredge pump 204 is fixed to the mud discharge pipe 205. A fixed ring 207 and a fixed sleeve 208 are fixed inside the shielding cylinder 203. The motor A206 is fixed to the top of the shielding cylinder 203, and the motor shaft of the motor A206 passes through the shielding cylinder 203 and the fixed ring 207 and a transverse The bevel gears are fixed together, and a plurality of transverse bevel gears and vertical bevel gears are rotatably mounted on the fixed ring 207, and each transverse bevel gear is respectively meshed with a vertical bevel gear, and an annular internal gear 210 is rotatably mounted on the fixed ring 207, and the annular internal gear 210 is meshed with all the transverse bevel gears, and each vertical bevel gear is connected to a stirring blade 209 group through a belt, and each stirring blade 209 group includes two stirring blades 209, and the stirring blade 209 is rotatably mounted on the fixed sleeve 208, and the stirring blade 209 is detachable, and when one of the stirring blades 209 is damaged, only one stirring blade 209 can be replaced; During the dredging process, the lead screw moving subunit 201 first drives the electric cylinder 202, the shielding cylinder 203 and the sludge suction pump 204 to move left and right, so as to adjust the sludge at different positions for cleaning, and then the electric cylinder 202 pushes the shielding cylinder 203 and the sludge suction pump 204 to descend into the water body, and then the motor A206 is started to drive the stirring blade 209 to rotate, stir the sludge, and disperse the agglomerated sludge. After the stirring is completed, the sludge suction pump 204 sucks the sludge into the sludge discharge pipe 205; The shielding cylinder 203 is used to prevent other floating objects on the water surface from entering the mixing area and damaging the mixing blade 209 when the sludge is being mixed.

[0024] In an optional implementation manner of the embodiment of the present invention, as Figure 7-8 As shown, the filter unit 3 includes: a hydraulic cylinder A301, a water storage tank 302, a water outlet pipe 303, a conveyor belt 304, a filter box 305 and a rotating shaft 306; The bottom of the hydraulic cylinder A301 is hinged on the hull 1 of the dredging boat, the telescopic end of the hydraulic cylinder A301 is fixed to the filter box 305, the water storage tank 302 is fixed to the hull 1 of the dredging boat, the end of the water storage tank 302 is rotatably mounted with a rotating shaft 306, the rotating shaft 306 is fixed to the end of the filter box 305, and the side of the water storage tank 302 is provided with an opening, and the water outlet pipe 303 is fixed at the opening; The sludge will fall from the sludge discharge pipe 205 into the filter box 305, and the sludge will be filtered by the filter box 305, and the muddy water will leak into the water storage tank 302, and flow into the water body through the outlet pipe 303. When the filtering is completed, the hydraulic cylinder A301 will lift the filter box 305 and dump the sludge therein onto the conveyor belt 304, and the conveyor belt 304 will carry the sludge to the next link.

[0025] In an optional implementation manner of the embodiment of the present invention, as Fig. 9 As shown, the pushing unit 4 includes: a screw slider group 401, a connecting rod 402 and a pushing plate 403; The lead screw slider group 401 is fixed on the extended bracket of the dredging boat hull 1. Two sliders are arranged on the dredging boat hull 1. Each slider is hinged to a connecting rod 402. The other end of the connecting rod 402 is hinged to a push plate 403. The middle position of the push plate 403 is slidably mounted on the frame of the lead screw slider group 401. The silt will enter the transport unit 5 along with the transmission of the conveyor belt 304 . Since the silt is heavy, in order for the transport unit 5 to leave, the push plate 403 needs to be driven by the lead screw slider group 401 to push the transport unit 5 .

[0026] In an optional implementation manner of the embodiment of the present invention, as Figure 10-11 As shown, the transport unit 5 includes: a box 501, a turnover box 502, universal wheels 503 and a hydraulic cylinder B504; Four universal wheels 503 are fixed below the box 501. The inside of the box 501 is hinged with a hydraulic cylinder B504. The telescopic end of the hydraulic cylinder B504 is fixed with the flip box 502. The end of the flip box 502 is rotatably mounted with the end of the box 501. The box 501 is driven to move in the groove of the folding bridge unit 6 by the four universal wheels 503 below the box 501. After the box 501 is moved to the land, the hydraulic cylinder B504 is extended and retracted to drive the flip box 502 to flip, so that the silt inside the flip box 502 is poured onto the land or other vehicles for transporting silt.

[0027] In an optional implementation manner of the embodiment of the present invention, as Figure 12-13 As shown, the folding bridge unit 6 includes: a motor B601, a winding wheel 602, a bottom plate 603, a column 604, a pulley 605, a wire rope 606, a first folding plate 607, a second folding plate 608, a third folding plate 609, a fourth folding plate 610, a first connecting rod 611, a second connecting rod 612, a supporting claw 613 and a connecting plate 614; The bottom plate 603 is fixed on the hull 1 of the dredging boat, and two columns 604 are fixed on the bottom plate 603. A motor B601 is fixed at the bottom of each column 604. The motor shaft of the motor B601 passes through the column 604 and is fixed to the winding wheel 602. A pulley 605 is rotatably installed on the top of the column 604. A steel wire rope 606 is wound around the winding wheel 602. The steel wire rope 606 passes through the pulley 605 in the middle and is finally fixed on the second connecting rod 612. The first folding plate 607 is fixed on the bottom plate 603. The second folding plate 608 and the front end of the first connecting rod 611 are rotatably installed on the bottom plate 603. On the bracket, the end of the second folding plate 608 is hinged with the front end of the third folding plate 609, the common rotation axis of the second folding plate 608 and the third folding plate 609 is fixed to the connecting plate 614, the end of the first connecting rod 611 and the front end of the second connecting rod 612 are fixed to the connecting plate 614, the end of the third folding plate 609 and the fourth folding plate 610 are hinged together, the common rotation axis of the third folding plate 609 and the fourth folding plate 610 is fixed to the connecting plate 614, the end of the second connecting rod 612 is fixed to the connecting plate 614, and the end of the fourth folding plate 610 is fixed with two supporting claws 613; In order to allow the transport unit 5 to leave the dredging ship hull 1 and run to land, the motor B601 drives the winding wheel 602 to rotate, so that the winding wheel 602 drives the wire rope 606 to reel in and release the wire, and then pulls the second connecting rod 612. Since the second connecting rod 612 and the connecting plate 614 are fixed, the second folding plate 608, the third folding plate 609 and the fourth folding plate 610 will be driven to fold or spread on land at the same time. When spread on land, the supporting claw 613 will contact the ground first, and the claw on the supporting claw 613 will be inserted into the ground to make it firmly fixed on the ground.

[0028] It should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left” and “right” are based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

Claims

1. An above-water dredging device for substandard water bodies, characterized in that: include: A dredging vessel hull (1), a sludge cleaning unit (2), a filtering unit (3), a propulsion unit (4), a transport unit (5) and a folding bridge unit (6); A sludge cleaning unit (2) is fixed on a bracket at the bow of the hull (1) of the dredging ship. The sludge cleaning unit (2) is arranged on the side of the hull (1) of the dredging ship. A sludge discharge pipe (205) is arranged in the sludge cleaning unit (2). The sludge discharge pipe (205) is fixed on a column of the hull (1) of the dredging ship. A filter unit (3) is arranged below the sludge discharge pipe (205). The filter unit (3) is fixed on the hull (1) of the dredging ship. A transport unit (3) is arranged behind the filter unit (3). The transport unit (5) comprises four universal wheels (503) which are stuck in the groove of the folding bridge unit (6). The side of the transport unit (5) is provided with a pushing unit (4). After the transport unit (5) is filled with silt, the pushing unit (4) will push the transport unit (5) to move and provide assistance. The pushing unit (4) is fixed on the extended bracket of the hull (1) of the dredging vessel. The folding bridge unit (6) is fixed at the stern of the hull (1) of the dredging vessel and can be folded and unfolded at any time.

2. The above-water dredging device for substandard water bodies according to claim 1, characterized in that: The sludge cleaning unit (2) comprises: a screw moving subunit (201), an electric cylinder (202), a shielding cylinder (203), a sludge suction pump (204), a sludge discharge pipe (205), a motor A (206), a fixed ring (207), a fixed sleeve (208), a stirring blade (209) and an annular internal gear (210); The screw moving subunit (201) is fixed to the hull (1) of the dredging vessel via a bracket; two electric cylinders (202) are fixed to the slider of the screw moving subunit (201); the telescopic ends of the electric cylinders (202) are fixed to the top of the shielding cylinder (203); a dredge suction pump (204) is fixed in the middle of the shielding cylinder (203); the dredge suction pump (204) extends into the interior of the shielding cylinder (203); the mud outlet of the dredge suction pump (204) is fixed to the mud discharge pipe (205); a fixed ring (207) and a fixed sleeve (208) are fixed to the interior of the shielding cylinder (203); the motor A (206) is fixed to the top of the shielding cylinder (203); The motor shaft of the motor A (206) passes through the shielding cylinder (203) and the fixed ring (207) and is fixed together with a transverse bevel gear. A plurality of transverse bevel gears and vertical bevel gears are rotatably mounted on the fixed ring (207). Each transverse bevel gear is meshed with a vertical bevel gear. An annular internal gear (210) is rotatably mounted on the fixed ring (207). The annular internal gear (210) is meshed with all the transverse bevel gears. Each vertical bevel gear is connected to a stirring blade (209) group via a belt. Each stirring blade (209) group includes two stirring blades (209). The stirring blades (209) are rotatably mounted on the fixed sleeve (208).

3. The above-water dredging device for substandard water bodies according to claim 2, characterized in that: The stirring blades (209) are detachably arranged, and when one of the stirring blades (209) is damaged, only one stirring blade (209) can be replaced.

4. The above-water dredging device for substandard water bodies according to claim 1, characterized in that: The filtering unit (3) comprises: a hydraulic cylinder A (301), a water storage tank (302), a water outlet pipe (303), a conveyor belt (304), a filtering box (305) and a rotating shaft (306); The bottom of the hydraulic cylinder A (301) is hinged on the hull (1) of the dredging boat, the telescopic end of the hydraulic cylinder A (301) is fixed to the filter box (305), the water storage tank (302) is fixed to the hull (1) of the dredging boat, a rotating shaft (306) is rotatably mounted at the end of the water storage tank (302), the rotating shaft (306) is fixed to the end of the filter box (305), and an opening is provided on the side of the water storage tank (302), and a water outlet pipe (303) is fixed at the opening.

5. The above-water dredging device for substandard water bodies according to claim 1, characterized in that: The pushing unit (4) comprises: a lead screw slider group (401), a connecting rod (402) and a pushing plate (403); The lead screw slider group (401) is fixed on a protruding bracket of the hull (1) of the dredging vessel. Two sliders are arranged on the hull (1) of the dredging vessel. Each slider is hinged to a connecting rod (402). The other end of the connecting rod (402) is hinged to a push plate (403). The middle position of the push plate (403) is slidably mounted on the frame of the lead screw slider group (401).

6. The above-water dredging device for substandard water bodies according to claim 1, characterized in that: The transport unit (5) comprises: a box body (501), a tilting box (502), universal wheels (503) and a hydraulic cylinder B (504); Four universal wheels (503) are fixed below the box (501); the inside of the box (501) is hinged to a hydraulic cylinder B (504); the telescopic end of the hydraulic cylinder B (504) is fixed to the flip box (502); and the end of the flip box (502) is rotatably mounted to the end of the box (501).

7. The above-water dredging device for substandard water bodies according to claim 1, characterized in that: The folding bridge unit (6) comprises: a motor B (601), a winding wheel (602), a bottom plate (603), a column (604), a pulley (605), a wire rope (606), a first folding plate (607), a second folding plate (608), a third folding plate (609), a fourth folding plate (610), a first connecting rod (611), a second connecting rod (612), a supporting claw (613) and a connecting plate (614); The bottom plate (603) is fixed on the hull (1) of the dredging vessel. Two columns (604) are fixed on the bottom plate (603). A motor B (601) is fixed at the bottom of each column (604). The motor shaft of the motor B (601) passes through the column (604) and is fixed to the winding wheel (602). A pulley (605) is rotatably mounted on the top of the column (604). A steel wire rope (606) is wound around the winding wheel (602). The steel wire rope (606) passes through the pulley (605) in the middle and is finally fixed to the second connecting rod (612). The first folding plate (607) is fixed on the bottom plate (603). The second folding plate (608) and the front end of the first connecting rod (611) are rotatably mounted on the bottom plate (603). On the bracket on the plate (603), the end of the second folding plate (608) is hinged to the front end of the third folding plate (609), the common rotation axis of the second folding plate (608) and the third folding plate (609) is fixed to the connecting plate (614), the end of the first connecting rod (611) and the front end of the second connecting rod (612) are fixed to the connecting plate (614), the end of the third folding plate (609) and the fourth folding plate (610) are hinged together, the common rotation axis of the third folding plate (609) and the fourth folding plate (610) is fixed to the connecting plate (614), the end of the second connecting rod (612) is fixed to the connecting plate (614), and the end of the fourth folding plate (610) is fixed with two supporting claws (613).

8. The above-water dredging device for substandard water bodies according to claim 4 or 6, characterized in that: The hydraulic cylinder A (301) and the hydraulic cylinder B (504) both use telescopic telescopic levers.

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