CN109555180B - Inland river basin silt dredger - Google Patents
Inland river basin silt dredger Download PDFInfo
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- CN109555180B CN109555180B CN201811473145.8A CN201811473145A CN109555180B CN 109555180 B CN109555180 B CN 109555180B CN 201811473145 A CN201811473145 A CN 201811473145A CN 109555180 B CN109555180 B CN 109555180B
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- Prior art keywords
- mud
- sludge
- ring
- cleaning device
- cover body
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/8833—Floating installations
- E02F3/885—Floating installations self propelled, e.g. ship
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
- E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F7/00—Equipment for conveying or separating excavated material
- E02F7/04—Loading devices mounted on a dredger or an excavator hopper dredgers, also equipment for unloading the hopper
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Treatment Of Sludge (AREA)
- Catching Or Destruction (AREA)
Abstract
The invention provides a sludge dredger for inland river watershed, which comprises a dredger body 1, a digging tool 2, an operation cabin 3, a positioning pile 4 and a sludge storage bin 5, wherein a left cleaning device 6.1, a right cleaning device 6.2 and a sewage discharge device are arranged on the dredger, and the left cleaning device 6.1 and the right cleaning device 6.2 are respectively arranged at two sides of the sludge storage bin 5. The invention provides a dredger which is provided with a full-automatic mud storage bin cleaning device, can effectively clean the interior of a mud storage bin and has a good cleaning effect.
Description
Technical Field
The invention relates to the field of engineering machinery, in particular to a sludge dredger for an inland river basin.
Background
The dredger is used as an important tool for dredging a river channel, plays a main role in modern river channel cleaning, the former river channel cleaning is manually carried out, a lot of defects exist in manual cleaning, time and labor are wasted, a lot of dangers also exist, the dredger is different in use, the defects are solved one by one, a sludge storage bin for storing sludge exists in the dredger, the sludge storage bin cannot be effectively cleaned, and if the sludge is not cleaned, the sludge can be smelly when being irradiated by sunlight.
Disclosure of Invention
In view of the above-mentioned needs, the present invention provides a dredger for sludge in inland river basin.
The invention is realized by adopting the following technical scheme,
a sludge dredger for inland river basin comprises a dredger body 1, a digging tool 2, an operation cabin 3, a positioning pile 4 and a sludge storage bin 5, wherein a left cleaning device 6.1, a right cleaning device 6.2 and a sewage discharge device are arranged on the dredger body, the left cleaning device 6.1 and the right cleaning device 6.2 are respectively arranged at two sides of the sludge storage bin 5,
the left cleaning device 6.1 comprises a left cover body 6.11 hinged with the ship body 1, a cavity is formed between the left cover body 6.11 and the ship body 1, a left driving oil cylinder 6.12 is arranged in the cavity, the end part of a piston rod of the left driving oil cylinder 6.12 is rotatably connected with one end of a left first supporting rod 6.13 and one end of a left second supporting rod 6.14, the left first supporting rod 6.13 is hinged with the left cover body 6.11, the left second supporting rod 6.14 is hinged with the inside of the cavity, a left spray head 6.15 is arranged at the lower part of the left cover body 6.11, a left spray nozzle 6.16 is arranged on the left spray head 6.15, the left spray head 6.15 is connected with a left water pipe 6.17, and the left water pipe 6.17 is connected with a water pump;
the right cleaning device 6.2 comprises a right cover body 6.21 hinged with the ship body 1, a cavity is formed between the right cover body 6.21 and the ship body 1, a right driving oil cylinder 6.22 is arranged in the cavity, the end part of a piston rod of the right driving oil cylinder 6.22 is rotatably connected with one end of a right first supporting rod 6.23 and one end of a right second supporting rod 6.24, the right first supporting rod 6.23 is hinged with the right cover body 6.21, the right second supporting rod 6.24 is hinged with the inside of the cavity, the lower part of the right cover body 6.21 is provided with a right nozzle 6.25, the right nozzle 6.25 is provided with a right nozzle 6.26, the right nozzle 6.25 is connected with a right water pipe 6.27, and the right water pipe 6.27 is connected with a water pump;
the sewage discharge apparatus includes:
a left rotating rod 7.11, a left mud sucking port 7.12, a left mud conveying pipe 7.13, a left supporting ring 7.14, a left mud sucking pump 7.15, a left mud discharging pipe 7.16, a left hinging seat 7.17, a left pulling ring 7.18, a left steering ring 7.19, a left pulling rope 7.110,
A right rotating rod 7.21, a right mud sucking port 7.22, a right mud conveying pipe 7.23, a right supporting ring 7.24, a right mud sucking pump 7.25, a right mud discharging pipe 7.26, a right hinged seat 7.27, a right pull ring 7.28, a right steering ring 7.29 and a right pull rope 7.210,
the left rotating rod 7.11 is arranged at the bottom of the sludge storage bin 5 through a left hinged seat 7.17, a left sludge suction port 7.12 is arranged on the left rotating rod 7.11, the left sludge suction port 7.12 is connected with a left sludge conveying pipe 7.13, the left sludge conveying pipe 7.13 is arranged inside the left rotating rod 7.11, the left sludge conveying pipe 7.13 penetrates through a left support ring 7.14 arranged on the inner wall of the sludge storage bin 5 to be connected with a left sludge suction pump 7.15, sewage is discharged through a left sludge outlet pipe 7.16 connected with the left sludge suction pump 7.15, a left pull ring 7.18 is arranged at the end part of the left rotating rod 7.11, a left steering ring 7.19 is arranged on the left support ring 7.14, and the left pull rope 7.110 is connected to the left pull ring 7.18 and penetrates through the left steering ring 7.19 to be connected with a winch 8;
the right rotating rod 7.21 is arranged at the bottom of the mud storage bin 5 through a right hinged seat 7.27, a right mud suction port 7.22 is arranged on the right rotating rod 7.21, the right mud suction port 7.22 is connected with a right mud conveying pipe 7.23, the right mud conveying pipe 7.23 is arranged inside the right rotating rod 7.21, the right mud conveying pipe 7.23 penetrates through a right supporting ring 7.24 arranged on the inner wall of the mud storage bin 5 and is connected with a right mud suction pump 7.25, sewage is discharged through a right mud outlet pipe 7.26 connected with the right mud suction pump 7.25, a right pull ring 7.28 is arranged at the end part of the right rotating rod 7.21, a right steering ring 7.29 is arranged on the right supporting ring 7.24, and a right pull rope 7.210 is connected on the right pull ring 7.28 and penetrates through the right steering ring 7.29 and is connected with a winch 8.
Further, the hoist 8 has two reels connected to the left pulling rope 7.110 and the right pulling rope 7.210, respectively, and respective motors.
Further, the left nozzle 6.16 is inclined downwards at an angle, the left cover 6.11 is driven to open by the left driving oil cylinder 6.12, and the left nozzle 6.16 can spray water towards the side wall of the ship body 1.
Further, the right nozzle 6.26 is inclined downwards at an angle, the right driving oil cylinder 6.22 drives the lower right cover 6.21 to be opened, and the right nozzle 6.26 can spray water towards the side wall of the ship body 1. 5.
Further, the left mud conveying pipe 7.13 and the right mud conveying pipe 7.23 are both flexible pipes and can be extruded without being damaged.
Further, the left cleaning device 6.1 and the right cleaning device 6.2 are provided in plurality.
The invention provides a dredger which is provided with a full-automatic mud storage bin cleaning device, can effectively clean the interior of a mud storage bin and has a good cleaning effect.
Drawings
FIG. 1 is a schematic view of the construction of the dredger according to the invention;
FIG. 2 is a cut-away view of the present invention;
FIG. 3 is a schematic view of the left cleaning apparatus of the present invention;
FIG. 4 is a schematic view of the right cleaning apparatus of the present invention;
FIG. 5 is a top plan view of the hull of the present invention;
in the figure, a ship body 1, an excavating tool 2, an operation cabin 3, a positioning pile 4, a mud storage bin 5,
A left cleaning device 6.1, a right cleaning device 6.2,
A left cover body 6.11, a left driving oil cylinder 6.12, a left first supporting rod 6.13, a left second supporting rod 6.14, a left spray head 6.15, a left spray nozzle 6.16, a left water pipe 6.17,
A right cover body 6.21, a right driving oil cylinder 6.22, a right first supporting rod 6.23, a right second supporting rod 6.24, a right nozzle 6.25, a right nozzle 6.26, a right water pipe 6.27,
A left rotating rod 7.11, a left mud sucking port 7.12, a left mud conveying pipe 7.13, a left supporting ring 7.14, a left mud sucking pump 7.15, a left mud discharging pipe 7.16, a left hinging seat 7.17, a left pulling ring 7.18, a left steering ring 7.19, a left pulling rope 7.110,
A right rotating rod 7.21, a right mud sucking port 7.22, a right mud conveying pipe 7.23, a right supporting ring 7.24, a right mud sucking pump 7.25, a right mud discharging pipe 7.26, a right hinged seat 7.27, a right pull ring 7.28, a right steering ring 7.29, a right pull rope 7.210,
And a hoist 8.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, a sludge dredger for inland river basin comprises a dredger body 1, a digging tool 2, an operation cabin 3, a positioning pile 4 and a sludge storage bin 5, wherein a left cleaning device 6.1, a right cleaning device 6.2 and a sewage discharge device are arranged on the dredger body, the left cleaning device 6.1 and the right cleaning device 6.2 are respectively arranged at two sides of the sludge storage bin 5,
the left cleaning device 6.1 comprises a left cover body 6.11 hinged with the ship body 1, a cavity is formed between the left cover body 6.11 and the ship body 1, a left driving oil cylinder 6.12 is arranged in the cavity, the end part of a piston rod of the left driving oil cylinder 6.12 is rotatably connected with one end of a left first supporting rod 6.13 and one end of a left second supporting rod 6.14, the left first supporting rod 6.13 is hinged with the left cover body 6.11, the left second supporting rod 6.14 is hinged with the inside of the cavity, a left spray head 6.15 is arranged at the lower part of the left cover body 6.11, a left spray nozzle 6.16 is arranged on the left spray head 6.15, the left spray head 6.15 is connected with a left water pipe 6.17, and the left water pipe 6.17 is connected with a water pump;
the right cleaning device 6.2 comprises a right cover body 6.21 hinged with the ship body 1, a cavity is formed between the right cover body 6.21 and the ship body 1, a right driving oil cylinder 6.22 is arranged in the cavity, the end part of a piston rod of the right driving oil cylinder 6.22 is rotatably connected with one end of a right first supporting rod 6.23 and one end of a right second supporting rod 6.24, the right first supporting rod 6.23 is hinged with the right cover body 6.21, the right second supporting rod 6.24 is hinged with the inside of the cavity, the lower part of the right cover body 6.21 is provided with a right nozzle 6.25, the right nozzle 6.25 is provided with a right nozzle 6.26, the right nozzle 6.25 is connected with a right water pipe 6.27, and the right water pipe 6.27 is connected with a water pump;
the sewage discharge apparatus includes:
a left rotating rod 7.11, a left mud sucking port 7.12, a left mud conveying pipe 7.13, a left supporting ring 7.14, a left mud sucking pump 7.15, a left mud discharging pipe 7.16, a left hinging seat 7.17, a left pulling ring 7.18, a left steering ring 7.19, a left pulling rope 7.110,
A right rotating rod 7.21, a right mud sucking port 7.22, a right mud conveying pipe 7.23, a right supporting ring 7.24, a right mud sucking pump 7.25, a right mud discharging pipe 7.26, a right hinged seat 7.27, a right pull ring 7.28, a right steering ring 7.29 and a right pull rope 7.210,
the left rotating rod 7.11 is arranged at the bottom of the sludge storage bin 5 through a left hinged seat 7.17, a left sludge suction port 7.12 is arranged on the left rotating rod 7.11, the left sludge suction port 7.12 is connected with a left sludge conveying pipe 7.13, the left sludge conveying pipe 7.13 is arranged inside the left rotating rod 7.11, the left sludge conveying pipe 7.13 penetrates through a left support ring 7.14 arranged on the inner wall of the sludge storage bin 5 to be connected with a left sludge suction pump 7.15, sewage is discharged through a left sludge outlet pipe 7.16 connected with the left sludge suction pump 7.15, a left pull ring 7.18 is arranged at the end part of the left rotating rod 7.11, a left steering ring 7.19 is arranged on the left support ring 7.14, and the left pull rope 7.110 is connected to the left pull ring 7.18 and penetrates through the left steering ring 7.19 to be connected with a winch 8;
the right rotating rod 7.21 is arranged at the bottom of the mud storage bin 5 through a right hinged seat 7.27, a right mud suction port 7.22 is arranged on the right rotating rod 7.21, the right mud suction port 7.22 is connected with a right mud conveying pipe 7.23, the right mud conveying pipe 7.23 is arranged inside the right rotating rod 7.21, the right mud conveying pipe 7.23 penetrates through a right supporting ring 7.24 arranged on the inner wall of the mud storage bin 5 and is connected with a right mud suction pump 7.25, sewage is discharged through a right mud outlet pipe 7.26 connected with the right mud suction pump 7.25, a right pull ring 7.28 is arranged at the end part of the right rotating rod 7.21, a right steering ring 7.29 is arranged on the right supporting ring 7.24, and a right pull rope 7.210 is connected on the right pull ring 7.28 and penetrates through the right steering ring 7.29 and is connected with a winch 8.
The hoist 8 has two reels connected to the left pulling rope 7.110 and the right pulling rope 7.210, respectively, and respective motors.
The left nozzle 6.16 inclines downwards at an angle, the left cover body 6.11 is driven to be opened by the left driving oil cylinder 6.12, and the left nozzle 6.16 can spray water towards the side wall of the ship body 1.
The right nozzle 6.26 inclines downwards at an angle, the right driving oil cylinder 6.22 drives the lower right cover body 6.21 to be opened, and the right nozzle 6.26 can spray water towards the side wall of the ship body 1. 5.
The left mud conveying pipe 7.13 and the right mud conveying pipe 7.23 are both flexible pipes and can be extruded without damage.
The left cleaning device 6.1 and the right cleaning device 6.2 are provided in plurality.
The left mud conveying pipe 7.13 and the right mud conveying pipe 7.23 can be restored to the state shown in the figure 2 when the winch releases the pull rope under the automatic gravity, and the left mud conveying pipe 7.13 and the right mud conveying pipe 7.23 are pulled up by the winch when the mud conveying pipe is not used.
After the dredger unloads sludge, the driving oil cylinders (comprising the left driving oil cylinder and the right driving oil cylinder) are controlled by the control device, so that the first supporting rod and the second supporting rod (comprising the left first supporting rod 6.13, the left second supporting rod 6.14, the right first supporting rod 6.23 and the right second supporting rod 6.24) are driven to drive the cover body to be opened (comprising the left cover body and the right cover body), the nozzle can face the side plate of the ship body, the water pump is started to spray water for washing, meanwhile, the pull rope is lengthened on the winch, the left rotating rod and the right rotating rod rotate to be in contact with the bottom plate of the sludge storage bin, and the sludge suction pump is started to discharge the washed sewage.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (6)
1. The utility model provides an inland river basin silt dredger, has ship main part (1), digging tool (2), operation cabin (3), spud (4) and stores up mud storehouse (5), its characterized in that: a left cleaning device (6.1), a right cleaning device (6.2) and a sewage discharge device are arranged on the dredger, the left cleaning device (6.1) and the right cleaning device (6.2) are respectively arranged at two sides of the mud storage bin (5),
the left cleaning device (6.1) comprises a left cover body (6.11) hinged with the ship body (1), a cavity is formed between the left cover body (6.11) and the ship body (1), a left driving oil cylinder (6.12) is arranged in the cavity, the end part of a piston rod of the left driving oil cylinder (6.12) is rotatably connected with one end of a left first supporting rod (6.13) and one end of a left second supporting rod (6.14), the left first supporting rod (6.13) is hinged with the left cover body (6.11), the left second supporting rod (6.14) is hinged with the interior of the cavity, a left spray head (6.15) is arranged at the lower part of the left cover body (6.11), a left spray nozzle (6.16) is arranged on the left spray head (6.15), the left spray head (6.15) is connected with a left water pipe (6.17), and the left water pipe (6.17) is connected with a water pump;
the right cleaning device (6.2) comprises a right cover body (6.21) hinged with the ship body (1), a cavity is formed between the right cover body (6.21) and the ship body (1), a right driving oil cylinder (6.22) is arranged in the cavity, the end part of a piston rod of the right driving oil cylinder (6.22) is rotatably connected with one end of a right first supporting rod (6.23) and one end of a right second supporting rod (6.24), the right first supporting rod (6.23) is hinged with the right cover body (6.21), the right second supporting rod (6.24) is hinged with the inside of the cavity, a right spray head (6.25) is arranged at the lower part of the right cover body (6.21), a right spray nozzle (6.26) is arranged on the right spray head (6.25), the right spray head (6.25) is connected with a right water pipe (6.27), and the right water pipe (6.27) is connected with a water pump;
the sewage discharge apparatus includes:
a left rotating rod (7.11), a left mud sucking port (7.12), a left mud conveying pipe (7.13), a left supporting ring (7.14), a left mud sucking pump (7.15), a left mud discharging pipe (7.16), a left hinging seat (7.17), a left pulling ring (7.18), a left steering ring (7.19), a left pulling rope (7.110),
A right rotating rod (7.21), a right mud suction port (7.22), a right mud conveying pipe (7.23), a right supporting ring (7.24), a right mud suction pump (7.25), a right mud outlet pipe (7.26), a right hinged seat (7.27), a right pull ring (7.28), a right steering ring (7.29) and a right pull rope (7.210),
the left rotating rod (7.11) is arranged at the bottom of the sludge storage bin (5) through a left hinge seat (7.17), a left sludge suction port (7.12) is formed in the left rotating rod (7.11), a left sludge conveying pipe (7.13) is connected to the left sludge suction port (7.12), the left sludge conveying pipe (7.13) is arranged inside the left rotating rod (7.11), the left sludge conveying pipe (7.13) penetrates through a left support ring (7.14) arranged on the inner wall of the sludge storage bin (5) and is connected with a left sludge suction pump (7.15), sewage is discharged through a left sludge discharge pipe (7.16) connected with the left sludge suction pump (7.15), a left pull ring (7.18) is arranged at the end part of the left rotating rod (7.11), a left steering ring (7.19) is arranged on the left support ring (7.14), and a left pull rope (7.110) is connected to the left pull ring (7.18) and penetrates through the steering ring (7.19) and is connected with a hoisting machine (8);
the mud storage device is characterized in that the right rotary rod (7.21) is arranged at the bottom of the mud storage bin (5) through the right hinge seat (7.27), a right mud suction port (7.22) is formed in the right rotary rod (7.21), the right mud suction port (7.22) is connected with the right mud conveying pipe (7.23), the right mud conveying pipe (7.23) is arranged inside the right rotary rod (7.21), the right mud conveying pipe (7.23) penetrates through a right support ring (7.24) arranged on the inner wall of the mud storage bin (5) and is connected with the right mud suction pump (7.25), sewage is discharged through a right mud outlet pipe (7.26) connected with the right mud suction pump (7.25), the end part of the right rotary rod (7.21) is provided with a right pull ring (7.28), a right steering ring (7.29) is arranged on the right support ring (7.24), and the right pull rope (7.210) is connected with the right pull ring (7.28) and penetrates through the right steering ring (7.29) and is connected with a winch (8).
2. A sludge dredger for river basins, as claimed in claim 1, wherein: the winch (8) is provided with two winding drums and respective motors, and the two winding drums are respectively connected with a left pull rope (7.110) and a right pull rope (7.210).
3. A sludge dredger for river basins, as claimed in claim 1, wherein: the left nozzle (6.16) inclines downwards at an angle, the left cover body (6.11) is driven to be opened by the left driving oil cylinder (6.12), and the left nozzle (6.16) can spray water towards the side wall of the ship body (1).
4. A sludge dredger for river basins, as claimed in claim 1, wherein: the right nozzle (6.26) inclines downwards at an angle, the right driving oil cylinder (6.22) drives the lower right cover body (6.21) to be opened, and the right nozzle (6.26) can spray water towards the side wall of the ship body (1).
5. A sludge dredger for river basins, as claimed in claim 1, wherein: the left mud conveying pipe (7.13) and the right mud conveying pipe (7.23) are both flexible pipes and can be extruded without damage.
6. A sludge dredger for river basins, as claimed in claim 1, wherein: the left cleaning device (6.1) and the right cleaning device (6.2) are provided with a plurality of cleaning devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811473145.8A CN109555180B (en) | 2018-12-04 | 2018-12-04 | Inland river basin silt dredger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811473145.8A CN109555180B (en) | 2018-12-04 | 2018-12-04 | Inland river basin silt dredger |
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| Publication Number | Publication Date |
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| CN109555180A CN109555180A (en) | 2019-04-02 |
| CN109555180B true CN109555180B (en) | 2020-11-06 |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4925950B2 (en) * | 2007-07-09 | 2012-05-09 | 健夫 鈴木 | Dredging and landfill methods |
| CN202577259U (en) * | 2012-05-30 | 2012-12-05 | 湖北恒荣机械有限公司 | Novel water weed desilting machine |
| JP2014094731A (en) * | 2012-11-12 | 2014-05-22 | Koichi Harada | Water cleaner and water serve boat |
| CN206495248U (en) * | 2017-01-23 | 2017-09-15 | 南通安中水务科技有限公司 | A kind of river course automatic cleaning ship and its system based on technology of Internet of things |
| CN108360596A (en) * | 2018-02-02 | 2018-08-03 | 姚美蓉 | A kind of hydraulic engineering channel cleanout device |
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2018
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