CN115869665B - Sedimentation tank is mud scraper under water - Google Patents
Sedimentation tank is mud scraper under water Download PDFInfo
- Publication number
- CN115869665B CN115869665B CN202211629349.2A CN202211629349A CN115869665B CN 115869665 B CN115869665 B CN 115869665B CN 202211629349 A CN202211629349 A CN 202211629349A CN 115869665 B CN115869665 B CN 115869665B
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- frame
- rotating
- circulating
- box
- output end
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- 238000004062 sedimentation Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title description 6
- 238000012216 screening Methods 0.000 claims abstract description 38
- 238000007790 scraping Methods 0.000 claims abstract description 35
- 238000011084 recovery Methods 0.000 claims abstract description 19
- 238000000926 separation method Methods 0.000 claims description 4
- 239000013013 elastic material Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 description 12
- 239000010802 sludge Substances 0.000 description 7
- 238000005086 pumping Methods 0.000 description 6
- 210000005056 cell body Anatomy 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Removal Of Floating Material (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses an underwater mud scraper of a sedimentation tank, which relates to the technical field of mud scrapers and comprises the following components: the moving tracks are distributed at the edges of two sides of the pool body; the movable base is connected with the output end of the movable rail, and the output end of the movable base extends to the inside of the tank body and is provided with a mud scraping box; the recovery area of intercommunication is installed to one side of scraping mud case, and scrapes mud case and include: the box body is internally provided with a plurality of obliquely arranged screening frames; the outside of link, a plurality of the link is all rotated and is connected with the rotation area, and each link all installs between adjacent screening frame through coil spring. Compared with the prior art, the scraper is provided with the rotatable rotating belts, so that the quality of contact with the bottom of the sedimentation tank can be improved, and when the bottom of the sedimentation tank is uneven, the rotating belts at corresponding positions can be attached under the drive of the spiral spring, so that the quality of mud scraping can be improved.
Description
Technical Field
The invention relates to the technical field of mud scrapers, in particular to an underwater mud scraper of a sedimentation tank.
Background
After the sedimentation tank is used for a certain time, the bottom of the sedimentation tank can sediment sludge or other sediments, so that the interior of the sedimentation tank needs to be cleaned regularly.
Through searching, chinese patent (publication No. CN 109045780A) discloses a reciprocating sedimentation tank underwater mud scraper, which comprises a wedge-shaped mud scraper, wherein a groove is formed on the lower surface of the wedge-shaped mud scraper, and a plurality of scraping strips protruding from the lower surface of the mud scraper are arranged on the lower surface of the mud scraper.
In the prior art, when the scraping strip of the mud scraper contacts with the bottom of the sedimentation tank, if the bottom of the sedimentation tank is uneven, the contact quality of the scraping strip and the sedimentation tank is poor, so that the mud scraping effect is poor.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide an underwater mud scraper of a sedimentation tank.
In order to achieve the above purpose, the present invention provides the following technical solutions: the underwater mud scraper for the sedimentation tank comprises a moving track and a moving base which are arranged at the edges of two sides of the tank body, wherein two ends of the moving base are respectively connected with the output ends of two groups of moving tracks;
the output end of the movable base is provided with a mud scraping box, and one side of the mud scraping box, which is far away from the moving direction of the movable base, is provided with a communicated recovery belt;
the mud scraping box comprises a box body, wherein a plurality of obliquely arranged screening frames are arranged in the box body, and connecting frames are arranged between every two adjacent screening frames through spiral springs; one end of the connecting frame far away from the moving direction of the moving base is crossed with the screening frame on the basis of the spiral spring, and the crossed end of the connecting frame is lower than the height of the screening frame;
the outer sides of the connecting frames are rotatably connected with rotating belts; one end of the rotating belt, which moves towards the moving base, is contacted with the sedimentation tank based on the moving base;
the bottom end of the screening frame is provided with an elastic block positioned between adjacent connecting frames, and the elastic block is used for a gap between the adjacent connecting frames;
the rotating belt, the connecting frame and the elastic block are used for filtering the sludge or impurities through the screening frames and then recycling the sludge or impurities into the recycling bag.
Further, one end of the movable base is provided with a recovery box, and two ends of the recovery box are also connected with the output ends of the two groups of movable rails and are used for synchronously moving with the movable base;
the lower surface mounting of collection box has adjustment mechanism, the circulation frame is installed to adjustment mechanism's output, separating mechanism is installed to the bottom of circulation frame, separating mechanism's output extends to in each adjacent screening frame's the clearance.
Further, the adjusting mechanism comprises a first rotating motor connected with the recovery box, a second cylinder is arranged at the output end of the first rotating motor, and the output end of the second cylinder is connected with the circulating frame;
the circulating frame drives the separating mechanism to separate from each screening frame in the mud scraping box based on the second air.
Further, the separating mechanism comprises a second rotating motor connected with the circulating frame, a roller body is arranged at the output end of the second rotating motor, and one end of the roller body, far away from the second rotating motor, is rotationally connected with the circulating frame;
the outer side of the roller body is provided with a plurality of connecting rods distributed in a plurality of rows;
one end of each connecting rod is rotationally connected with a first rotating frame, and one end of each first rotating frame is rotationally connected with a second rotating frame;
and limiting blocks are arranged at the rotating parts of the connecting rod, the first rotating frame and the second rotating frame and are used for limiting the rotating angles of the first rotating frame and the second rotating frame.
Further, a pumping mechanism is arranged in the circulation frame, and a water inlet of the pumping mechanism extends to the inside of the tank body;
the inside of the connecting rod is provided with expansion pieces extending to the inside of the first rotating frame and the second rotating frame, and each expansion piece is connected with the output end of the pumping mechanism;
after the expansion piece expands, the connecting rod and the second rotating frame are driven to rotate, and a hook is formed between the connecting rod and the expansion piece.
Further, the movable base comprises a driving seat connected with the movable rail, a plurality of first air cylinders are arranged in the driving seat, and a vertical lifting frame is arranged between output ends of the first air cylinders;
the mud scraping box is connected with the output end of the vertical lifting frame.
Further, side wing plates are arranged on two sides of the box body;
the side wing plate is inclined towards the upper side of the moving direction of the moving base in the vertical direction;
and the side wing plates are inclined toward the outside of the case in the horizontal direction.
Further, the elastic block is made of elastic materials, and the inclination angle of one end of the elastic block, which is far away from the screening frame, is the same as that of the connecting frame;
the elastic block is provided with the circular arc position of perk towards screening frame's one end.
Further, the circulating frame comprises an assembling frame connected with the adjusting mechanism, and a plurality of circulating belts distributed side by side are arranged in the assembling frame;
a plurality of coaxially distributed driving rollers and supporting rollers are arranged between the circulating belts;
gaps are formed at one end, facing the separating mechanism, of the plurality of circulating frames, and are used for passing through when connecting rods in each row in the separating mechanism rotate;
a plurality of protruding blocks are arranged on the outer side of each circulating belt.
Compared with the prior art, the invention has the following beneficial effects:
compared with the prior art, the scraper is provided with the rotatable rotating belts, so that the quality of contact with the bottom of the sedimentation tank can be improved, and when the bottom of the sedimentation tank is uneven, the rotating belts at the corresponding positions can be attached under the drive of the spiral spring, so that the quality of mud scraping can be improved;
and an elastic block for caulking is also arranged between the rotating belts and used for reducing dead angles between the rotating belts, so that the mud scraping quality is further improved;
on the other hand, the invention can screen larger impurities in the sludge through the screening frame, and the impurities are recovered into the recovery tank through the separating mechanism and the circulating frame; wherein, first rotating frame and second rotating frame between the separating mechanism can form the hook under the state of expansion piece inflation, can form between the connecting rod to conveniently clear up the impurity between each screening frame, and the expansion piece is rotatory behind one side to the circulation frame, and disconnection supply, first rotating frame and second rotating frame can rotate under the effect of external force, thereby shift the inside to the circulation frame with the impurity.
Drawings
FIG. 1 is a schematic diagram of a sedimentation tank underwater mud scraper;
FIG. 2 is a partial top cross-sectional view of the mud scraping box of the present invention;
FIG. 3 is a partial cross-sectional view of the mud scraping box of the present invention;
FIG. 4 is a partial cross-sectional view of a separation mechanism of the present invention;
FIG. 5 is a partial top cross-sectional view of the circulation frame of the present invention;
1. a cell body; 2. a moving track; 3. a moving base; 4. a mud scraping box; 5. recovering the belt; 6. a recovery box; 7. an adjusting mechanism; 8. a circulation rack; 9. a separation mechanism; 31. a driving seat; 32. a first cylinder; 33. a vertical lifting frame; 41. a case; 42. rotating the belt; 43. a screening frame; 44. a connecting frame; 45. an elastic block; 46. a side wing plate; 91. a connecting rod; 92. a first rotating frame; 93. a second turret; 94. a limiting block; 95. an expansion member; 81. assembling a frame; 82. a circulating belt; 83. and (5) a protruding block.
Detailed Description
Referring to fig. 1 to 5, an underwater mud scraper for a sedimentation tank comprises a moving rail 2 and a moving base 3 which are arranged at the edges of two sides of a tank body 1, wherein two ends of the moving base 3 are respectively connected with the output ends of the two groups of moving rails 2;
the output end of the movable base 3 is provided with a mud scraping box 4, and one side of the mud scraping box 4 far away from the moving direction of the movable base 3 is provided with a communicated recovery belt 5;
the mud scraping box 4 comprises a box body 41, wherein a plurality of obliquely arranged screening frames 43 are arranged in the box body 41, and connecting frames 44 are arranged between every two adjacent screening frames 43 through spiral springs; one end of the connecting frame 44 away from the moving direction of the moving base 3 intersects the screening frame 43 based on a coil spring, and one end of the connecting frame 44 intersecting is lower than the height of the screening frame 43;
the outer side of each connecting frame 44 is rotatably connected with a rotating belt 42; the end of the rotating belt 42 moving toward the moving base 3 is brought into contact with the sedimentation tank based on the moving base 3;
the bottom end of the screening frame 43 is provided with an elastic block 45 positioned between the adjacent connecting frames 44, and the elastic block 45 is used for a gap between the adjacent connecting frames 44;
the rotating belt 42, the connecting frame 44 and the elastic block 45 filter the sludge or foreign matters through the respective screening frames 43 and then recover the sludge or foreign matters into the recovery belt 5.
One end of the movable base 3 is provided with a recovery box 6, and two ends of the recovery box 6 are also connected with the output ends of the two groups of movable rails 2 and are used for synchronously moving with the movable base 3;
the lower surface mounting of collection box 6 has adjustment mechanism 7, and circulation frame 8 is installed to adjustment mechanism's 7 output, and separating mechanism 9 is installed to circulation frame 8's bottom, and circulation frame 8 internally mounted has pumping mechanism, and pumping mechanism's water inlet extends to the inside of cell body 1, and separating mechanism's 9 output extends to in each adjacent screening frame 43's the clearance.
The regulating mechanism 7 comprises a first rotating motor connected with the recovery box 6, a second cylinder is arranged at the output end of the first rotating motor, and the output end of the second cylinder is connected with the circulating frame 8;
the circulation frame 8 is separated from each screening frame 43 in the mud scraping box 4 based on the second air-driven separation mechanism 9 and is rotated by the first rotating motor to avoid contact with the mud scraping box 4 when it rises along the moving base 3.
The separating mechanism 9 comprises a second rotating motor connected with the circulating frame 8, a roller body is arranged at the output end of the second rotating motor, and one end of the roller body, which is far away from the second rotating motor, is rotationally connected with the circulating frame 8;
a plurality of connecting rods 91 distributed in a plurality of rows are installed at the outer side of the roller body.
The movable base 3 comprises a driving seat 31 connected with the movable track 2, a plurality of first air cylinders 32 are arranged in the driving seat 31, a vertical lifting frame 33 is arranged between output ends of the first air cylinders 32, and the vertical lifting frame 33 comprises a screw rod driving mechanism;
the mud scraping box 4 is connected with the output end of a screw rod driving mechanism in the vertical lifting frame 33.
Referring to fig. 2 to 3, the case 41 is provided with side wings 46 on both sides thereof;
the side wing plate 46 is inclined in the vertical direction toward the upper side in the moving direction of the moving base 3;
and the side wing plates 46 are inclined in the horizontal direction toward the outside of the case 41;
by setting two groups of inclined directions, water, sludge and impurities in the sedimentation tank are gathered towards the direction of the box 41 when the box 41 moves.
The elastic block 45 is made of elastic material, and the inclination angle of one end of the elastic block 45 far away from the screening frame 43 is the same as the inclination angle of the connecting frame 44;
the elastic block 45 is provided with an upward-tilting arc portion toward one end of the screen frame 43.
Referring to fig. 4, a first rotating frame 92 is rotatably connected to one end of each connecting rod 91, and a second rotating frame 93 is rotatably connected to one end of the first rotating frame 92;
the rotation parts of the connecting rod 91, the first rotating frame 92 and the second rotating frame 93 are provided with a limiting block 94 for limiting the rotation angle of the first rotating frame 92 and the second rotating frame 93.
The inside of the connecting rod 91 is provided with expansion pieces 95 extending to the inside of the first rotating frame 92 and the second rotating frame 93, and each expansion piece 95 is connected with the output end of the pumping mechanism;
after the expansion member 95 expands, the connecting rod 91 and the second rotating frame 93 are driven to rotate, and a hook is formed between the connecting rod 91 and the second rotating frame.
Referring to fig. 5, the circulation rack 8 includes an assembly rack 81 connected to the adjusting mechanism 7, and a plurality of circulation belts 82 arranged side by side are installed inside the assembly rack 81;
a plurality of coaxially distributed driving rollers and supporting rollers are arranged between each circulating belt 82;
gaps are formed at one end of the plurality of circulation frames 8 facing the separating mechanism 9 and used for passing through when each row of connecting rods 91 in the separating mechanism 9 rotate;
a plurality of protruding blocks 83 are provided on the outer side of each endless belt 82.
Working principle:
when in use, the mud scraping box 4 descends to the bottom of the sedimentation tank along the vertical lifting frame 33 in the movable base 3, and the connecting frame 44 in the mud scraping box 4 and the rotating belt 42 at the outer side thereof are contacted with the bottom of the sedimentation tank;
subsequently the adjusting mechanism 7 is activated, the separating mechanism 9 is moved to the upper side of the mud scraping box 4, and the rows of connecting rods 91 are inserted between the individual screening frames 43 in the mud scraping box 4;
then the moving track 2 is started to move the mud scraping box 4 along the bottom of the sedimentation tank, the connecting frame 44 is tightly attached to the upper side of the bottom of the sedimentation tank under the drive of the spiral spring, and the mud enters the box body 41 through the rotating belt 42 and is filtered by the screening frames 43 and then moves into the recovery belt 5;
simultaneously, the second rotating motor in the separating mechanism 9 is started to drive each connecting rod 91 to rotate, and when the corresponding connecting rod 91 passes through the screening frames 43, the expansion piece 95 inside the corresponding connecting rod 91 is filled with water, the first rotating frame 92 and the second rotating frame 93 are hooked with the corresponding connecting rod 91, impurities on each screening frame 43 are hooked and move to the upper side of the circulating frame 8 along with rotation, the supply of the expansion piece 95 is disconnected, the impurities contact with the protruding blocks 83 on the outer side of the impurities when the impurities pass through each circulating belt 82 in the circulating frame 8 until the first rotating frame 92 and the second rotating frame 93 are bent and separated from the circulating belt 82, then the impurities move into the recovery box 6 along with the circulating belt 82, and drop into the recovery box 6 when the corresponding part of the circulating belt 82 rotates to the lower side.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention are intended to be considered as protecting the scope of the present template.
Claims (1)
1. An underwater mud scraper for a sedimentation tank, comprising:
the movable rails (2) are distributed at the edges of two sides of the pool body (1);
the movable base (3), the movable base (3) is connected with the output end of the movable track (2), the output end of the movable base (3) extends to the inside of the pool body (1), and the output end of the movable base (3) is provided with a mud scraping box (4);
one side of the mud scraping box (4) is provided with a communicated recovery belt (5), and the mud scraping box (4) comprises:
the screening device comprises a box body (41), wherein a plurality of obliquely arranged screening frames (43) are arranged in the box body (41);
the outer sides of a plurality of the connecting frames (44) are respectively and rotatably connected with a rotating belt (42), and each connecting frame (44) is arranged between the adjacent screening frames (43) through a spiral spring;
each connecting frame (44) is distributed in a crossing way with the screening frames (43);
an elastic block (45), wherein a plurality of the elastic blocks (45) are connected with the screening frames (43) and are used for filling gaps between adjacent connecting frames (44);
one end of the movable base (3) is provided with a recovery box (6) which synchronously moves;
an adjusting mechanism (7) is arranged on the lower surface of the recovery box (6), a circulating frame (8) is arranged at the output end of the adjusting mechanism (7), a separating mechanism (9) is arranged at the bottom end of the circulating frame (8), and the output end of the separating mechanism (9) extends into the gap between each two adjacent screening frames (43);
the adjusting mechanism (7) comprises a first rotating motor connected with the recovery box (6), a second cylinder is arranged at the output end of the first rotating motor, and the output end of the second cylinder is connected with the circulating frame (8);
the circulating frame (8) drives the separating mechanism (9) to be separated from each screening frame (43) in the mud scraping box (4) based on the second air cylinder, and rotates through the first rotating motor, so that the mud scraping box (4) is prevented from contacting the moving base (3) when the mud scraping box ascends along the moving base;
the separating mechanism (9) comprises a second rotating motor connected with the circulating frame (8), a roller body is arranged at the output end of the second rotating motor, and one end of the roller body, which is far away from the second rotating motor, is rotationally connected with the circulating frame (8);
a plurality of connecting rods (91) distributed in a plurality of rows are arranged on the outer side of the roller body, and the connecting rods (91) circularly pass through the corresponding screening frames (43);
one end of each connecting rod (91) is rotatably connected with a first rotating frame (92), and one end of each first rotating frame (92) is rotatably connected with a second rotating frame (93);
the rotating parts of the connecting rod (91), the first rotating frame (92) and the second rotating frame (93) are respectively provided with a limiting block (94) for limiting the rotating angle;
an expansion piece (95) extending to the inside of the first rotating frame (92) and the second rotating frame (93) is arranged in the connecting rod (91);
after the expansion piece (95) expands, the first rotating frame (92) and the second rotating frame (93) are driven to rotate, and hooks are formed among the first rotating frame (92), the second rotating frame (93) and the connecting rod (91);
the movable base (3) comprises a driving seat (31) connected with the movable track (2), a plurality of first air cylinders (32) are arranged in the driving seat (31), and a vertical lifting frame (33) is arranged between output ends of the first air cylinders (32);
the mud scraping box (4) is connected with the output end of the vertical lifting frame (33);
the elastic block (45) is made of elastic materials, and the inclination angle of one end of the elastic block (45) far away from the screening frame (43) is the same as that of the connecting frame (44);
one end of the elastic block (45) facing the screening frame (43) is provided with an upward tilted arc part;
the circulating frame (8) comprises an assembling frame (81) connected with the adjusting mechanism (7), and a plurality of circulating belts (82) distributed side by side are arranged in the assembling frame (81);
gaps are arranged at one end, facing the separation mechanism (9), among the plurality of circulating belts (82);
a plurality of protruding blocks (83) are arranged on the outer side of each circulating belt (82).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211629349.2A CN115869665B (en) | 2022-12-19 | 2022-12-19 | Sedimentation tank is mud scraper under water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211629349.2A CN115869665B (en) | 2022-12-19 | 2022-12-19 | Sedimentation tank is mud scraper under water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115869665A CN115869665A (en) | 2023-03-31 |
| CN115869665B true CN115869665B (en) | 2024-02-13 |
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ID=85755148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211629349.2A Active CN115869665B (en) | 2022-12-19 | 2022-12-19 | Sedimentation tank is mud scraper under water |
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| Country | Link |
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| CN (1) | CN115869665B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007204965A (en) * | 2006-01-31 | 2007-08-16 | Utsunomiya Kogyo Kk | Screen |
| CN201304267Y (en) * | 2008-09-19 | 2009-09-09 | 刘家池 | sand water purifier |
| JP2010036143A (en) * | 2008-08-07 | 2010-02-18 | Panasonic Corp | Solid/liquid separator |
| CN208440340U (en) * | 2018-04-23 | 2019-01-29 | 嘉兴市锦福缩染有限公司 | Mud-scraping apparatus for sedimentation basin |
| CN208927684U (en) * | 2018-09-05 | 2019-06-04 | 嘉兴市天伦纳米染整有限公司 | A kind of sedimentation basin mud scraper |
| CN209885305U (en) * | 2019-03-31 | 2020-01-03 | 江苏工大环保有限公司 | Novel amplitude-flow type mud scraper |
| CN211752731U (en) * | 2019-12-31 | 2020-10-27 | 安徽恒帆环保科技有限公司 | Multifunctional truss suction dredger |
-
2022
- 2022-12-19 CN CN202211629349.2A patent/CN115869665B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007204965A (en) * | 2006-01-31 | 2007-08-16 | Utsunomiya Kogyo Kk | Screen |
| JP2010036143A (en) * | 2008-08-07 | 2010-02-18 | Panasonic Corp | Solid/liquid separator |
| CN201304267Y (en) * | 2008-09-19 | 2009-09-09 | 刘家池 | sand water purifier |
| CN208440340U (en) * | 2018-04-23 | 2019-01-29 | 嘉兴市锦福缩染有限公司 | Mud-scraping apparatus for sedimentation basin |
| CN208927684U (en) * | 2018-09-05 | 2019-06-04 | 嘉兴市天伦纳米染整有限公司 | A kind of sedimentation basin mud scraper |
| CN209885305U (en) * | 2019-03-31 | 2020-01-03 | 江苏工大环保有限公司 | Novel amplitude-flow type mud scraper |
| CN211752731U (en) * | 2019-12-31 | 2020-10-27 | 安徽恒帆环保科技有限公司 | Multifunctional truss suction dredger |
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| Publication number | Publication date |
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| CN115869665A (en) | 2023-03-31 |
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