CN103912032A - Sweeping and suction desilting machine for floating sludge and flowing sludge of drinking water reservoir and desilting method thereof - Google Patents
Sweeping and suction desilting machine for floating sludge and flowing sludge of drinking water reservoir and desilting method thereof Download PDFInfo
- Publication number
- CN103912032A CN103912032A CN201410173280.6A CN201410173280A CN103912032A CN 103912032 A CN103912032 A CN 103912032A CN 201410173280 A CN201410173280 A CN 201410173280A CN 103912032 A CN103912032 A CN 103912032A
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- Prior art keywords
- suction
- sweeping
- desilting
- facility
- mud
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- 238000010408 sweeping Methods 0.000 title claims abstract description 41
- 239000003651 drinking water Substances 0.000 title claims abstract description 23
- 235000020188 drinking water Nutrition 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000010802 sludge Substances 0.000 title abstract 14
- 238000007667 floating Methods 0.000 title abstract 6
- 238000010276 construction Methods 0.000 claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 238000012423 maintenance Methods 0.000 claims description 5
- 238000005516 engineering process Methods 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 241001063191 Elops affinis Species 0.000 description 1
- 235000002756 Erythrina berteroana Nutrition 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- HKPHPIREJKHECO-UHFFFAOYSA-N butachlor Chemical compound CCCCOCN(C(=O)CCl)C1=C(CC)C=CC=C1CC HKPHPIREJKHECO-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/06—Floating substructures as supports
- E02F9/062—Advancing equipment, e.g. spuds for floating dredgers
-
- 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
- E02F3/8841—Floating installations wherein at least a part of the soil-shifting equipment is mounted on a ladder or boom
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Sewage (AREA)
Abstract
The invention discloses a sweeping and suction desilting machine for floating sludge and flowing sludge of a drinking water reservoir and a desilting method of the sweeping and suction desilting machine. The sweeping and suction desilting machine comprises a suction cavity body, wherein the suction cavity body is connected with a dredge pump of a workboat through a pipeline, suction inlets are formed in the two sides of the suction cavity body and are hinged to movable cover plates respectively, hydraulic cylinders are hinged to the suction cavity body, one end of a movable rod of each hydraulic cylinder is hinged to the corresponding movable cover plate, a bottom cavity in the suction cavity body is arranged in the mode that the interior is high and the exterior is low, and vertical guide plates are fixedly arranged on the suction inlets and located in the bottom cavity. According to the sweeping and suction desilting machine for the floating sludge and the flowing sludge of the drinking water reservoir and the desilting method of the sweeping and suction desilting machine, due to the characteristics that the floating sludge and the flowing sludge on the bottom layer of the drinking water reservoir are high in fluidity, the diameter of sludge particles is small, and the sludge particles can easily move and diffuse, the dredge pump on the workboat is used for providing vacuum suction, the floating sludge and the flowing sludge are sucked out through the sweeping and suction desilting machine in slight fan-shaped swing in the unidirectional slow sweeping and suction mode that sweeping is carried out on the left side when suction is carried out on the left side, and sweeping is carried out on the right side when suction is carried out on the right side, and the desilting purpose is achieved. The sweeping and suction desilting machine and a construction process provide good technology and equipment support for removal of the floating sludge and the flowing sludge of the reservoir, and the popularization and application value is remarkable.
Description
Technical field
The present invention relates to a kind of desilting facility and dredging method thereof, particularly relate to sweeping of drinking water reservoir bottom mud scum and stream mud and inhale desilting facility and dredging method thereof.
Background technology
Reservoir has the comprehensive utilization functions such as flood control, irrigation, water supply, generating, is having irreplaceable critical role aspect economic development and environmental protection.China is vast in territory, reservoir is numerous, mostly built the 1970s and 1980s in last century, most lack effective sand discharge design, after operation for many years, now ubiquity silting phenomenon, seriously undermine the effective storage of reservoir, affect reservoir benefit and normally bring into play, even affect reservoir operation, part reservoir sediment accumulation is quite seriously in the situation of scrapping.Due to each reservoir function difference, feature difference, the situation of alluvial is also not quite similar, and therefore needs to take different desilting equipments and method.In prior art, the large and medium-sized reservoir of part utilizes that strand suction is dredged more, grab dredger, air-powered pump and waterpower are inhaled mud equipment and carried out desilting, small reservoir carries out machinery in conjunction with bulldozer, excavator etc. for reinforcement and excavates desilting, and operating water depth, the removing foreign material ability of different desilting equipments are all different.But, for drinking water reservoir, due to its special environmental protection and safe requirement, make above-mentioned these common desilting equipments, cannot directly use in reservoir area, the fine sediment particularly depositing for reservoir area, because particle diameter is little, starting and diffusion are easily, be difficult for precipitation, mud scum and stream mud layer are formed at bottom, these mud scums and stream mud can not be scraped excavating of axe by machete, otherwise easily cause the diffusion of silt, and the secondary pollution of water body, thereby prior art still lacks special desilting facility and construction technology thereof for drinking water reservoir bottom mud scum and stream mud.
Summary of the invention
Technical problem to be solved by this invention is to overcome existing defect in above-mentioned prior art, be that conventional desilting equipment cannot meet drinking water reservoir bottom mud scum and the requirement of stream desilting, provide a kind of applicable drinking water reservoir bottom mud scum and sweeping of stream mud to inhale desilting facility and dredging method thereof, and can be applied in the desilting and storage capacity maintenance of other reservoirs.
The present invention has adopted following technical proposal to solve its technical problem.
Desilting facility are inhaled in sweeping of a kind of drinking water reservoir mud scum and stream mud, comprise suction cavity main body, this suction cavity main body is connected with workboat dredge pump by boats and ships suction pipeline, it is characterized in that: described suction cavity main body top is equipped with dredging tube, this dredging tube one end is connected with dredge pump by rubber hose, inhale cavity main body both sides and be equipped with intake, the hinged removable cover of difference in this intake outside, both sides, two hydraulic cylinder main bodys are hinged on the housing upper end of inhaling cavity main body, the outer of hinged removable cover distinguished in motion bar one end of this two hydraulic cylinder, inhale cavity main body inner bottom part cavity and be low inside and high outside form, in chamber, intake place is fixedly equipped with vertical deflector.
Applying the above-mentioned dredging method of inhaling desilting facility of sweeping, is to carry out according to the following steps in its job execution technique:
(1) select to meet the requirement of drinking water reservoir construction and can conveniently pass in and out the environment-friendly type workboat of reservoir, will sweep and inhale desilting facility and be arranged on and construct on crane span structure;
(2) workboat arrives construction area, and a throwing both sides side anchor that falls, transfers construction crane span structure to the bottom and higher than mud face height, adjusting linkage and hydraulic mechanism, make to sweep and inhale bottom desilting facility suction cavity main body and mud face maintenance basic horizontal;
(3) adopt the fan-shaped suction mud that sweeps, sweeping suction facility transfers to mud scum and stream mud layer, facility are in hull middle, close right side removable cover, open left side removable cover, start dredge pump, simultaneously under the drive of travelling winch, facility are slowly swept suction along fan-shaped track to the left, in the time that facility sweep to Far Left, travelling winch stops, then first open right side removable cover, close again left side removable cover, travelling winch starts again, drive facility slowly to sweep suction along fan-shaped track to the right, in the time that facility sweep to rightmost, travelling winch stops, then first open left side removable cover, close again right side removable cover, travelling winch again starts rear drive facility and sweeps suction to reverse fan-shaped track, so move in circles,
(4) sweep while inhaling operation, take and observe the concentration of hydraulic mixture that densimeter shows, if concentration kept stable, suction is swept in the left and right of continuing to move in circles,
(5) concentration of hydraulic mixture of observing while inhaling operation if sweep declines larger, stop operation, facility stop at position, middle, the workboat station that marches forward, then continue repeating step (3) and carry out left and right and sweep suction operation, and repeating step (4) carries out concentration of hydraulic mixture observation;
(6), until predetermined operation region is all swept and sucked into, stop sweeping sweeping after suction and inhale facility and slowly leave the water, to keep water body clean.
Outstanding feature of the present invention is for drinking water reservoir bottom mud scum and flows the feature that mud mobility is strong, sediment grain size little Yi starts and spreads, provide pull of vacuum by dredge pump on workboat, inhale desilting facility by sweeping of slight fan-shaped swing, open on a left suction left side, the right unidirectional form of slowly sweeping suction of opening of right suction, mud scum and stream mud are pumped out, reach the object of desilting.Equipment involved in the present invention and construction technology support for reservoir mud scum and the removing of flowing mud provide good technology and equipment, and application value is remarkable.
Accompanying drawing explanation
Fig. 1 sweeps the perspective view of inhaling desilting facility in the present invention.
Fig. 2 sweeps the lateral view of inhaling desilting facility in the present invention.
Fig. 3 is that the present invention applies to sweep and inhales the desilting facility schematic diagram at construction area.
Fig. 4 is that the present invention applies to sweep and inhales desilting facility and make the fan-shaped schematic diagram of inhaling mud scum and stream mud of sweeping.
In figure, each sequence number is expressed as:
1-suction cavity main body; 11-intake; 12-deflector; 13-hinge otic placode; 14-hydraulic cylinder base;
2-dredging tube; 21-otic placode;
3-rubber hose;
4-removable cover; 41-hinge otic placode; 42-connection otic placode;
5-hydraulic cylinder; 51-motion bar;
6-construction crane span structure;
7-boats and ships suction pipeline;
8-dredge pump;
9-workboat;
10-travelling winch;
100-mud scum and stream mud layer;
101-mud;
120-construction operation region;
α-suction cavity main body 1 inner bottom part is in the angle of gradient at intake place; The maximum opening angle of β-removable cover; θ-suction is swept to the angle theta between the end of limit, both sides; The distance of A-mono-station.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the invention will be further described.
See figures.1.and.2, a kind of drinking water reservoir mud scum of the present invention and sweeping of stream mud are inhaled desilting facility, comprise and inhale cavity main body 1, and this suction cavity main body 1 is connected with workboat 9 dredge pumps 8 by boats and ships suction pipeline 7.Described suction cavity main body 1 both sides are equipped with intake 11, inhale cavity main body 1 inner bottom part cavity and are low inside and high outside form, are conducive to entering smoothly of silt current, reduce resistance.Its inner bottom part is 20 °～45 at the angle of gradient α at intake 11 places, and the present embodiment is set to best 30 °.In addition, in chamber, intake 11 places are fixedly equipped with vertical deflector 12, and this deflector 12 has also played the effect of inhaling cavity main body 1 housing in inner support.
Suction cavity main body of the present invention 1 top is equipped with dredging tube 2, and these dredging tube 2 one end are connected with dredge pump 8 by rubber hose 3.On described dredging tube 2, be also fixedly equipped with the otic placode 21 that can be connected with travelling winch 10.
Described suction cavity main body 1 is fixedly equipped with hinge otic placode 13, is fixedly equipped with corresponding hinge otic placode 41 on removable cover 4, and this two removable cover 4 is hinged with suction cavity main body 1 by bearing pin and hinge otic placode respectively in the outside of both sides intake 11.
The present invention inhales cavity main body 1 housing upper end and is fixedly equipped with hydraulic cylinder base 14, two hydraulic cylinder 5 main bodys and is and is rotationally connected shape with the housing upper end of inhaling cavity main body 1 by this two hydraulic cylinder base 14 respectively.
Outer being also fixedly equipped with of removable cover 4 connects otic placode 42, and one end of the motion bar 51 on this two hydraulic cylinder 5 is hinge-like by the outer connection otic placode of going up 42 of this two removable cover 4 with removable cover 4 respectively.Control the keying that hydraulic cylinder 5 just can regulate removable cover 4.The maximum opening angle β of described removable cover 4 is 70 °.
Of the present invention sweeping inhaled desilting facility and is arranged on workboat 9 and constructs on crane span structure 6, regulate the angle of inhaling cavity main body 1 and mud face by linkage, make its maintenance become basic horizontal state with mud face, dredging tube 2 is connected with the boats and ships suction pipeline 7 on crane span structure by rubber hose 3, form certain vacuum by the dredge pump 8 in workboat 9, control the keying that hydraulic cylinder 5 regulates respectively both sides removable cover 4, can sweep mud scum and the stream mud layer 100 of suction and pumping water suction bottom of the reservior layer, also both sides removable cover 4 can be opened simultaneously to fixed point suction mud.The mud sucking drains into given place by mud delivery pipeline and carries out subsequent treatment.
With reference to Fig. 3 and Fig. 4, of the present inventionly utilize the above-mentioned dredging method of inhaling desilting facility of sweeping, its job execution technique is carried out according to the following steps:
(1) select to meet the requirement of drinking water reservoir construction and can conveniently pass in and out the environment-friendly type workboat 9 of reservoir, will sweep and inhale desilting facility and be arranged on and construct on crane span structure 6;
(2) workboat 9 arrives construction operation region 120, and the stake throwing both sides side anchor that falls, transfers construction crane span structure 6 to the bottom and higher than mud face height, regulates linkage and hydraulic mechanism, makes to sweep suction desilting facility and inhales cavity main body 1 bottom and mud face maintenance basic horizontal;
(3) adopt the fan-shaped suction mud that sweeps, sweeping suction facility transfers to mud scum and stream mud layer 100, facility are in hull middle, close right side removable cover 4, open left side removable cover 4, start dredge pump 8, simultaneously under the drive of travelling winch 10, facility are slowly swept suction along fan-shaped track to the left, in the time that facility sweep to Far Left, travelling winch 10 stops, then first open right side removable cover 4, close again left side removable cover 4, travelling winch 10 starts again, drive facility slowly to sweep suction along fan-shaped track to the right, in the time that facility sweep to rightmost, travelling winch 10 stops, then first open left side removable cover 4, close again right side removable cover 4, after starting again, travelling winch 10 drive facility to sweep suction to reverse fan-shaped track, so move in circles,
(4) sweep while inhaling operation, take and observe the concentration of hydraulic mixture that densimeter shows, if concentration kept stable, suction is swept in the left and right of continuing to move in circles,
(5) concentration of hydraulic mixture of observing while inhaling operation if sweep declines larger, stop operation, facility stop at position, middle, the march forward distance A of a station of workboat 9, then continue repeating step (3) and carry out left and right and sweep suction operation, and repeating step (4) carries out concentration of hydraulic mixture observation;
(6), until predetermined operation region is all swept and sucked into, stop sweeping sweeping after suction and inhale facility and slowly leave the water, to keep water body clean.
The distance A of a station described in above-mentioned steps (5) is 1～2 meter.
The present invention sweeps and inhales desilting facility to inhale the angle theta being swept between the end of limit, both sides be 120 degree.
It is that fixed point is inhaled mud that another kind of the present invention is swept suction form of construction work, being about to sweep the suction cavity main body 1 of inhaling desilting facility transfers to the certain position of mud scum and stream mud layer 100 and keeps motionless, two side cover plates are all opened, the vacuum now forming by dredge pump 8 completely, mud is sucked to chamber, go out by suction pipe pumping, this form of construction work, adapts to the mud scum state that fluidity of slurry is stronger substantially again.
The present invention is not the mud 101 directly excavating at the bottom of reservoir, but produce vacuum by dredge pump 8, regulate the keying of left and right removable cover 4 by the hydraulic cylinder 5 on suction cavity main body 1, coordinate and form vacuum environment, produce best suction effect, more liquid mud scum and stream mud layer 100 are pumped on the water surface, thereby make water body keep clean.
Claims (10)
1. a drinking water reservoir mud scum is inhaled desilting facility with sweeping of stream mud, comprise suction cavity main body, this suction cavity main body is connected with workboat dredge pump by boats and ships suction pipeline, it is characterized in that: described suction cavity main body top is equipped with dredging tube, this dredging tube one end is connected with dredge pump by rubber hose, inhale cavity main body both sides and be equipped with intake, the hinged removable cover of difference in this intake outside, both sides, two hydraulic cylinder main bodys are hinged on the housing upper end of inhaling cavity main body, the outer of hinged removable cover distinguished in motion bar one end of this two hydraulic cylinder, inhale cavity main body inner bottom part cavity and be low inside and high outside form, in chamber, intake place is fixedly equipped with vertical deflector.
2. drinking water reservoir mud scum according to claim 1 and sweeping of stream mud are inhaled desilting facility, it is characterized in that: on described dredging tube, be fixedly equipped with the otic placode that can be connected with travelling winch.
3. drinking water reservoir mud scum according to claim 1 and sweeping of stream mud are inhaled desilting facility, it is characterized in that: described suction cavity main body is undertaken hinged with removable cover by the hinge otic placode being fixedly connected with separately thereon.
4. drinking water reservoir mud scum according to claim 1 and sweeping of stream mud are inhaled desilting facility, it is characterized in that: described hydraulic cylinder main body is inhaled the hydraulic cylinder base of cavity main body housing upper end and hydraulic cylinder main body and is and is rotationally connected shape by being fixedly connected on.
5. drinking water reservoir mud scum according to claim 1 and sweeping of stream mud are inhaled desilting facility, it is characterized in that: described hydraulic cylinder motion bar one end is hinged by outer connection otic placode and the removable cover of removable cover.
6. drinking water reservoir mud scum according to claim 1 and sweeping of stream mud are inhaled desilting facility, it is characterized in that: described suction cavity main body inner bottom part is 20 °～45 ° in the angle of gradient at intake place.
7. drinking water reservoir mud scum according to claim 1 and sweeping of stream mud are inhaled desilting facility, it is characterized in that: the maximum opening angle of described removable cover is 70 °.
8. application rights requires the dredging method of inhaling desilting facility of sweeping described in 1, it is characterized in that job execution technique carries out according to the following steps:
(1) select to meet the requirement of drinking water reservoir construction and can conveniently pass in and out the environment-friendly type workboat of reservoir, will sweep and inhale desilting facility and be arranged on and construct on crane span structure;
(2) workboat arrives job location, and a throwing both sides side anchor that falls, transfers construction crane span structure to the bottom and higher than mud face height, and adjusting linkage and hydraulic mechanism make to sweep and inhale bottom desilting facility suction cavity main body and mud face maintenance basic horizontal;
(3) adopt the fan-shaped suction mud that sweeps, sweeping suction facility transfers to mud scum and stream mud layer, facility are in hull middle, close right side removable cover, open left side removable cover, start dredge pump, simultaneously under the drive of travelling winch, facility are slowly swept suction along fan-shaped track to the left, in the time that facility sweep to Far Left, travelling winch stops, then first open right side removable cover, close again left side removable cover, travelling winch starts again, drive facility slowly to sweep suction along fan-shaped track to the right, in the time that facility sweep to rightmost, travelling winch stops, then first open left side removable cover, close again right side removable cover, travelling winch again starts rear drive facility and sweeps suction to reverse fan-shaped track, so move in circles,
(4) sweep while inhaling operation, take and observe the concentration of hydraulic mixture that densimeter shows, if concentration kept stable, suction is swept in the left and right of continuing to move in circles,
(5) concentration of hydraulic mixture of observing while inhaling operation if sweep declines larger, stop operation, facility stop at position, middle, the workboat station that marches forward, then continue repeating step (3) and carry out left and right and sweep suction operation, and repeating step (4) carries out concentration of hydraulic mixture observation;
(6), until predetermined operation region is all swept and sucked into, stop sweeping sweeping after suction and inhale facility and slowly leave the water, to keep water body clean.
9. the dredging method of inhaling desilting facility of sweeping according to claim 8, is characterized in that: the distance of a station described in step (5) is 1～2 meter.
10. the dredging method of inhaling desilting facility of sweeping according to claim 8, is characterized in that: sweep and inhale desilting facility to inhale the angle being swept between the end of limit, both sides be 120 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410173280.6A CN103912032A (en) | 2014-04-28 | 2014-04-28 | Sweeping and suction desilting machine for floating sludge and flowing sludge of drinking water reservoir and desilting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410173280.6A CN103912032A (en) | 2014-04-28 | 2014-04-28 | Sweeping and suction desilting machine for floating sludge and flowing sludge of drinking water reservoir and desilting method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103912032A true CN103912032A (en) | 2014-07-09 |
Family
ID=51038003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410173280.6A Pending CN103912032A (en) | 2014-04-28 | 2014-04-28 | Sweeping and suction desilting machine for floating sludge and flowing sludge of drinking water reservoir and desilting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103912032A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929174A (en) * | 2015-03-26 | 2015-09-23 | 文建超 | Suction and delivery system of rubber breathing vacuum high-pressure energy-saving pump |
| CN108316377A (en) * | 2018-02-27 | 2018-07-24 | 宁波弘海众创空间服务有限公司 | A kind of suction head system of energy saving and environment friendly undisturbed soil hydraulic suction dredge |
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| CN1130704A (en) * | 1995-03-08 | 1996-09-11 | 肖冠英 | Traction shuttle running type hydraulic dredger |
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| CN203834539U (en) * | 2014-04-28 | 2014-09-17 | 中交疏浚技术装备国家工程研究中心有限公司 | Drinking water reservoir float mud and drift mud sweeping, sucking and dredging machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN85203938U (en) * | 1985-09-20 | 1988-02-10 | 甘肃省水利科学研究所 | Improved hydraulic dredging device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104929174A (en) * | 2015-03-26 | 2015-09-23 | 文建超 | Suction and delivery system of rubber breathing vacuum high-pressure energy-saving pump |
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| CN108316377A (en) * | 2018-02-27 | 2018-07-24 | 宁波弘海众创空间服务有限公司 | A kind of suction head system of energy saving and environment friendly undisturbed soil hydraulic suction dredge |
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Application publication date: 20140709 |
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