CN221141368U - Oil recovery machine's collection oil slick device that circles round - Google Patents
Oil recovery machine's collection oil slick device that circles round Download PDFInfo
- Publication number
- CN221141368U CN221141368U CN202323174327.4U CN202323174327U CN221141368U CN 221141368 U CN221141368 U CN 221141368U CN 202323174327 U CN202323174327 U CN 202323174327U CN 221141368 U CN221141368 U CN 221141368U
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- Prior art keywords
- oil
- floating
- groups
- pipe
- water
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- 238000011084 recovery Methods 0.000 title description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 129
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000010521 absorption reaction Methods 0.000 claims abstract description 22
- 238000004140 cleaning Methods 0.000 claims abstract description 20
- 239000012535 impurity Substances 0.000 abstract description 5
- 230000005484 gravity Effects 0.000 description 4
- 238000007790 scraping Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 230000009286 beneficial 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/20—Controlling water pollution; Waste water treatment
- Y02A20/204—Keeping clear the surface of open water from oil spills
Landscapes
- Cleaning Or Clearing Of The Surface Of Open Water (AREA)
Abstract
The utility model relates to the technical field of collecting floating oil, in particular to a rotary floating oil collecting device of an oil collecting machine, which can quickly collect the floating oil and clean impurities in the oil by arranging a cleaning mechanism, thereby improving the efficiency of collecting the floating oil and reducing the damage to equipment; comprises an oil absorption mechanism; the device also comprises a water absorbing mechanism, three groups of floating mechanisms, a propelling mechanism and a cleaning mechanism, wherein the water absorbing mechanism is sleeved on the oil absorbing mechanism, the three groups of floating mechanisms are arranged on the oil absorbing mechanism, the propelling mechanism is arranged in the oil absorbing mechanism, and the cleaning mechanism is sleeved on the oil absorbing mechanism; the oil absorption mechanism receives oil, the water absorption mechanism absorbs water to enable the water surface to sink into a bowl shape, the floating mechanism enables the equipment to sink into the water, the propulsion mechanism propels the equipment, and the cleaning mechanism cleans sundries wound on the oil absorption mechanism.
Description
Technical Field
The utility model relates to the technical field of oil slick collection, in particular to a rotary oil slick collection device of an oil receiving machine.
Background
The oil recovery machine plays an important role in water area purification and ocean purification, and can float oil on the surface of the water area and the ocean surface.
In the existing oil recovery machine, for example, in the patent of 201921505513. X, the oil recovery machine is provided with a rotary oil collecting device, and the rotary oil collecting device is matched with an oil guide groove, so that when a rotary brush scrapes oil, the rotary brush collides with an oil scraping plate, oil splashed to two sides can be reagglomerated on the oil scraping plate through the oil guide groove, meanwhile, oil reversely recovered along a rotary brush blade is absorbed on an oil absorbing pad, and when a driving shaft rotates, the oil scraping strip can squeeze and scrape the oil on the oil absorbing pad out and then enters the oil scraping plate from the oil guide groove, so that the effectiveness of oil recovery is higher in the oil recovery process, and the oil recovery efficiency is improved.
However, in the oil recovery operation process, because the oil adsorptivity and the adhesion are large, some rubbish and aquatic plants are easy to adhere, so that equipment and fan blades are blocked in the recovery process, and the oil recovery efficiency is reduced.
Disclosure of utility model
In order to solve the technical problems, the utility model provides the rotary oil collecting and floating device of the oil collecting machine, which is provided with the cleaning mechanism, so that the oil can be quickly collected and impurities in the oil can be cleaned, the efficiency of collecting the oil can be improved, and the damage to equipment can be reduced.
The utility model relates to a rotary oil-collecting floating device of an oil receiving machine, which comprises an oil absorption mechanism; the device also comprises a water absorbing mechanism, three groups of floating mechanisms, a propelling mechanism and a cleaning mechanism, wherein the water absorbing mechanism is sleeved on the oil absorbing mechanism, the three groups of floating mechanisms are arranged on the oil absorbing mechanism, the propelling mechanism is arranged in the oil absorbing mechanism, and the cleaning mechanism is sleeved on the oil absorbing mechanism;
The oil absorption mechanism is used for collecting oil, the water absorption mechanism is used for absorbing water to enable the water surface to sink into a bowl shape, the floating mechanism is used for enabling the equipment to sink into the water, the propulsion mechanism is used for propelling the equipment, and the cleaning mechanism is used for cleaning sundries wound on the oil absorption mechanism; through putting into the aquatic with equipment, make equipment march to the assigned position through opening propulsion mechanism, make equipment semi-submerged under water through opening floating mechanism, afterwards open water absorbing mechanism and absorb water, make the surface of water subside and be bowl form, and rivers out-diffusion form large tracts of land backward flow and make the oil inwards gather together, afterwards absorb oil through opening oil absorbing mechanism, make propulsion mechanism carry out the rotatory debris that cooperates oil absorbing mechanism to twine on oil absorbing mechanism and cut the clearance when water absorbing mechanism opens, thereby when collecting the oil slick fast, clear up impurity in the oil, thereby improved the efficiency of collecting the oil slick, and reduced the damage to equipment.
Preferably, the oil absorption mechanism comprises a frame body, a through pipe, an oil pump, three groups of auxiliary frames, a conical filter screen and a toothed ring, wherein the through pipe is vertically arranged on the frame body, the lower end of the through pipe is connected with an oil return pipe, the oil pump is arranged in the through pipe, the upper end of the through pipe is connected with the frame body through the three groups of auxiliary frames, the conical filter screen is arranged at the upper end of the through pipe, the toothed ring is arranged at the upper end of the frame body, and the toothed ring is positioned at the lower side of the three groups of auxiliary frames; the oil pump is opened to enable the oil to be conveyed into the oil return pipe through the through pipe for collection.
Preferably, the water absorbing mechanism comprises a rotary drum, three groups of first fan blades, a gear, a driven gear and a driving mechanism, wherein the rotary drum is rotationally sleeved on the through pipe, the three groups of first fan blades are arranged on the rotary drum, the gear is connected with the upper end of the rotary drum, the driven gear is connected with the lower end of the rotary drum, the driving mechanism is arranged on the frame body, and the driving mechanism is meshed with the driven gear; the driven gear is driven by opening the driving mechanism, and the rotary drum is driven to rotate by the rotation of the driven gear, so that the first fan blades generate suction force to discharge water downwards, and bowl-shaped vortex is formed on the water surface.
Preferably, the floating mechanism comprises a first air cylinder, a connecting frame, a first floating box, a second floating box and a second air cylinder, wherein the fixed end of the first air cylinder is rotatably arranged at the lower end of the frame body, the connecting frame is rotatably arranged on the frame body, the output end of the first air cylinder is rotatably connected with the connecting frame, the first floating box is arranged on the connecting frame, the second floating box is rotatably arranged on the first floating box, the fixed end of the second air cylinder is rotatably arranged in the first floating box, and the output end of the second air cylinder is rotatably connected with the second floating box; the first recovery cylinder is used for enabling the connecting frame to be vertical, so that the first buoyancy tank is horizontally placed to form first-stage floating gravity, the second recovery cylinder is used for enabling the angle between the first buoyancy tank and the second buoyancy tank to be changed, draft is changed, different buoyancy is generated, and second-stage floating gravity is formed.
Preferably, the propelling mechanism comprises two groups of sleeves, two groups of motors I and a plurality of groups of fan blades II, the two groups of sleeves are parallelly arranged in the frame body, the two groups of sleeves are respectively positioned at two sides of the through pipe, the two groups of sleeves are connected with the through pipe to enable the whole body to be more stable, a group of motors I are arranged in each group of sleeves, and a plurality of groups of fan blades II are arranged at the output end of each group of motors I; the first motor is turned on to enable the second fan blade to rotate to generate thrust so as to enable the equipment to advance, and the second motor is turned on to enable the second fan blade to rotate to generate different thrust by changing the rotating speed of the first motor.
Preferably, the cleaning mechanism comprises a cross cutter and a planetary gear, the cross cutter is rotationally sleeved on the through pipe, the cross cutter is positioned at the lower side of the auxiliary frame, the toothed ring is positioned at the lower side of the cross cutter, the planetary gear is rotationally arranged at the lower end of the cross cutter, and the planetary gear is meshed with the toothed ring and the gear; the rotary drum rotates to enable the gears to rotate, the gears rotate to carry out meshing transmission on the planetary gears, the planetary gears rotate around the toothed ring in a meshing mode, the planetary gears rotate and drive the cross cutters to rotate, the cross cutters are matched with the three groups of auxiliary frames to generate shearing force, and therefore wound sundries are sheared and cleaned.
Preferably, the driving mechanism comprises a second motor and a driving gear, the second motor is arranged at the upper end inside the frame body, the driving gear is connected with the output end of the second motor, and the driving gear is meshed with the driven gear; the driving gear drives the driven gear by opening the motor II.
Compared with the prior art, the utility model has the beneficial effects that: through putting into the aquatic with equipment, make equipment march to the assigned position through opening propulsion mechanism, make equipment semi-submerged under water through opening floating mechanism, afterwards open water absorbing mechanism and absorb water, make the surface of water subside and be bowl form, and rivers out-diffusion form large tracts of land backward flow and make the oil inwards gather together, afterwards absorb oil through opening oil absorbing mechanism, make propulsion mechanism carry out the rotatory debris that cooperates oil absorbing mechanism to twine on oil absorbing mechanism and cut the clearance when water absorbing mechanism opens, thereby when collecting the oil slick fast, clear up impurity in the oil, thereby improved the efficiency of collecting the oil slick, and reduced the damage to equipment.
Drawings
FIG. 1 is a schematic illustration of an axially measured structure of the present utility model;
FIG. 2 is a schematic rear view of the present utility model;
FIG. 3 is a schematic elevational view of the present utility model;
FIG. 4 is a left side schematic view of the present utility model;
FIG. 5 is a schematic top view of the present utility model;
FIG. 6 is a schematic top view in cross-section of the present utility model;
FIG. 7 is a schematic view of a left-hand cross-sectional structure of the present utility model;
FIG. 8 is a schematic view of the right side cross-sectional structure of the present utility model;
The reference numerals in the drawings: 1. an oil absorption mechanism; 11. a frame body; 12. a through pipe; 13. an oil pump; 14. an auxiliary frame; 15. a conical filter screen; 16. a toothed ring; 2. a water absorbing mechanism; 21. a rotating drum; 22. a fan blade I; 23. a gear; 24. a driven gear; 3. a floating mechanism; 31. a first cylinder; 32. a connecting frame; 33. a first buoyancy tank; 34. a second buoyancy tank; 35. a second cylinder; 4. a propulsion mechanism; 41. a sleeve; 42. a first motor; 43. a second fan blade; 5. a cleaning mechanism; 51. a cross cutter; 52. a planetary gear; 6. a driving mechanism; 61. a second motor; 62. a driving gear.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. This utility model may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The utility model relates to a rotary oil collecting and floating device of an oil receiving machine, which comprises an oil suction mechanism 1; the device also comprises a water absorbing mechanism 2, three groups of floating mechanisms 3, a propelling mechanism 4 and a cleaning mechanism 5, wherein the water absorbing mechanism 2 is sleeved on the oil absorbing mechanism 1, the three groups of floating mechanisms 3 are arranged on the oil absorbing mechanism 1, the propelling mechanism 4 is arranged in the oil absorbing mechanism 1, and the cleaning mechanism 5 is sleeved on the oil absorbing mechanism 1;
The oil absorption mechanism 1 receives oil, the water absorption mechanism 2 absorbs water to enable the water surface to sink into a bowl shape, the floating mechanism 3 enables the equipment to sink into the water, the propulsion mechanism 4 propels the equipment, and the cleaning mechanism 5 cleans sundries wound on the oil absorption mechanism 1; the oil suction mechanism 1 comprises a frame 11, a through pipe 12, an oil pump 13, three groups of auxiliary frames 14, a conical filter screen 15 and a toothed ring 16, wherein the through pipe 12 is vertically arranged on the frame 11, the lower end of the through pipe 12 is connected with an oil return pipe, the oil pump 13 is arranged in the through pipe 12, the upper end of the through pipe 12 is connected with the frame 11 through the three groups of auxiliary frames 14, the conical filter screen 15 is arranged at the upper end of the through pipe 12, the toothed ring 16 is arranged at the upper end of the frame 11, and the toothed ring 16 is positioned at the lower side of the three groups of auxiliary frames 14; the water absorbing mechanism 2 comprises a rotary drum 21, three groups of first fan blades 22, a gear 23, a driven gear 24 and a driving mechanism 6, wherein the rotary drum 21 is rotationally sleeved on the through pipe 12, the three groups of first fan blades 22 are arranged on the rotary drum 21, the gear 23 is connected with the upper end of the rotary drum 21, the driven gear 24 is connected with the lower end of the rotary drum 21, the driving mechanism 6 is arranged on the frame 11, and the driving mechanism 6 is meshed with the driven gear 24; the floating mechanism 3 comprises a first cylinder 31, a connecting frame 32, a first floating box 33, a second floating box 34 and a second cylinder 35, wherein the fixed end of the first cylinder 31 is rotatably arranged at the lower end of the frame 11, the connecting frame 32 is rotatably arranged on the frame 11, the output end of the first cylinder 31 is rotatably connected with the connecting frame 32, the first floating box 33 is arranged on the connecting frame 32, the second floating box 34 is rotatably arranged on the first floating box 33, the fixed end of the second cylinder 35 is rotatably arranged in the first floating box 33, and the output end of the second cylinder 35 is rotatably connected with the second floating box 34; the propelling mechanism 4 comprises two groups of sleeves 41, two groups of first motors 42 and a plurality of groups of second fan blades 43, the two groups of sleeves 41 are arranged in the frame 11 in parallel, the two groups of sleeves 41 are respectively positioned at two sides of the through pipe 12, the two groups of sleeves 41 are connected with the through pipe 12 to enable the whole body to be more stable, a group of first motors 42 are arranged in each group of sleeves 41, and a plurality of groups of second fan blades 43 are arranged on the output end of each group of first motors 42; the cleaning mechanism 5 comprises a cross cutter 51 and a planetary gear 52, the cross cutter 51 is rotationally sleeved on the through pipe 12, the cross cutter 51 is positioned at the lower side of the auxiliary frame 14, the toothed ring 16 is positioned at the lower side of the cross cutter 51, the planetary gear 52 is rotationally arranged at the lower end of the cross cutter 51, and the planetary gear 52 is meshed with the toothed ring 16 and the gear 23; the driving mechanism 6 includes a second motor 61 and a driving gear 62, the second motor 61 is mounted at the upper end inside the frame 11, the driving gear 62 is connected to the output end of the second motor 61, and the driving gear 62 is meshed with the driven gear 24.
As shown in fig. 1 to 8, in the rotary oil collecting and floating device of the oil collecting machine, when the oil collecting machine works, the equipment is put into water, the fan blade II 43 is rotated to generate thrust by opening the motor I42 to enable the equipment to advance, different thrust is generated by changing the rotation speed of the two groups of motors I42 to enable the equipment to turn, so that the equipment moves to a designated position, the connecting frame 32 is erected through the recovery cylinder I31, the first floating gravity is formed by horizontally placing the first floating box 33, the included angle between the first floating box 33 and the second floating box 34 is changed through the recovery cylinder II 35, the draft is changed by the first floating box 33 and the second floating box 34, different buoyancy is generated, the second floating gravity is formed, and the equipment is semi-submerged under water, then the driving gear 62 is driven to the driven gear 24 by opening the motor II 61, the driven gear 24 is rotated to drive the rotary drum 21 to rotate, so that the fan blade I22 generates suction force to enable water to be discharged downwards, bowl-shaped eddies are formed on the water surface, water flow is outwards diffused to form large-area backflow to enable oil to gather inwards, then the oil is conveyed into an oil return pipe through the through pipe 12 to be collected by opening the oil pump 13, the rotary drum 21 is rotated while the gear 23 is rotated, the gear 23 is rotated to carry out meshing transmission on the planetary gear 52, the planetary gear 52 is meshed to rotate around the toothed ring 16, the planetary gear 52 is rotated while the cross cutter 51 is driven to rotate, shearing force is generated by cooperation of the cross cutter 51 and the three groups of auxiliary frames 14, and accordingly wound sundries are sheared and cleaned.
The oil pump 13 is a submersible pump, and the first motor 42 and the second motor 61 are both waterproof.
The oil pump 13, the first cylinder 31, the second cylinder 35, the first motor 42 and the second motor 61 of the present utility model are purchased on the market, and the present utility model can be installed and operated by those skilled in the art according to the attached instructions without the need for creative efforts of those skilled in the art.
The main functions realized by the utility model are as follows: in the process of collecting the floating oil, the cleaning mechanism is arranged, so that impurities in the oil can be cleaned when the floating oil is quickly collected, the efficiency of collecting the floating oil is improved, and the damage to equipment is reduced.
The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that it will be apparent to those skilled in the art that modifications and variations can be made without departing from the technical principles of the present utility model, and these modifications and variations should also be regarded as the scope of the utility model.
Claims (7)
1. The rotary oil-collecting and floating device of the oil receiving machine comprises an oil suction mechanism (1); the device is characterized by further comprising a water absorption mechanism (2), three groups of floating mechanisms (3), a propulsion mechanism (4) and a cleaning mechanism (5), wherein the water absorption mechanism (2) is sleeved on the oil absorption mechanism (1), the three groups of floating mechanisms (3) are arranged on the oil absorption mechanism (1), the propulsion mechanism (4) is arranged in the oil absorption mechanism (1), and the cleaning mechanism (5) is sleeved on the oil absorption mechanism (1);
The oil absorption mechanism (1) receives oil, the water absorption mechanism (2) absorbs water to enable the water surface to sink into a bowl shape, the floating mechanism (3) enables the equipment to sink into the water, the propulsion mechanism (4) propels the equipment, and the cleaning mechanism (5) cleans sundries wound on the oil absorption mechanism (1).
2. The oil collecting and floating device of an oil receiving machine according to claim 1, wherein the oil absorbing mechanism (1) comprises a frame body (11), a through pipe (12), an oil pump (13), three groups of auxiliary frames (14), a conical filter screen (15) and a toothed ring (16), the through pipe (12) is vertically arranged on the frame body (11), the lower end of the through pipe (12) is connected with an oil return pipe, the oil pump (13) is arranged in the through pipe (12), the upper end of the through pipe (12) is connected with the frame body (11) through the three groups of auxiliary frames (14), the conical filter screen (15) is arranged at the upper end of the through pipe (12), the toothed ring (16) is arranged at the upper end of the frame body (11), and the toothed ring (16) is arranged at the lower side of the three groups of auxiliary frames (14).
3. The rotary oil collecting and floating device of an oil receiving machine according to claim 2, wherein the water absorbing mechanism (2) comprises a rotary drum (21), three groups of first fan blades (22), a gear (23), a driven gear (24) and a driving mechanism (6), the rotary drum (21) is rotationally sleeved on the through pipe (12), the three groups of first fan blades (22) are installed on the rotary drum (21), the gear (23) is connected with the upper end of the rotary drum (21), the driven gear (24) is connected with the lower end of the rotary drum (21), the driving mechanism (6) is installed on the frame body (11), and the driving mechanism (6) is meshed with the driven gear (24).
4. The rotary oil collecting and floating device of the oil receiving machine according to claim 2, wherein the floating mechanism (3) comprises a first cylinder (31), a connecting frame (32), a first floating box (33), a second floating box (34) and a second cylinder (35), the fixed end of the first cylinder (31) is rotatably arranged at the lower end of the frame body (11), the connecting frame (32) is rotatably arranged on the frame body (11), the output end of the first cylinder (31) is rotatably connected with the connecting frame (32), the first floating box (33) is arranged on the connecting frame (32), the second floating box (34) is rotatably arranged on the first floating box (33), the fixed end of the second cylinder (35) is rotatably arranged in the first floating box (33), and the output end of the second cylinder (35) is rotatably connected with the second floating box (34).
5. The rotary oil collecting and floating device of the oil receiving machine according to claim 2, wherein the propelling mechanism (4) comprises two groups of sleeves (41), two groups of first motors (42) and a plurality of second fan blades (43), the two groups of sleeves (41) are arranged in the frame body (11) in parallel, the two groups of sleeves (41) are respectively positioned at two sides of the through pipe (12), the two groups of sleeves (41) are connected with the through pipe (12) to enable the whole body to be more stable, the first motors (42) are arranged in each group of sleeves (41), and the second fan blades (43) are arranged at the output end of each first motor (42).
6. A rotary oil collecting and floating device of an oil receiving machine according to claim 3, characterized in that the cleaning mechanism (5) comprises a cross cutter (51) and a planetary gear (52), the cross cutter (51) is rotatably sleeved on the through pipe (12), the cross cutter (51) is positioned at the lower side of the auxiliary frame (14), the toothed ring (16) is positioned at the lower side of the cross cutter (51), the planetary gear (52) is rotatably arranged at the lower end of the cross cutter (51), and the planetary gear (52) is meshed with the toothed ring (16) and the gear (23).
7. A rotary oil collecting and floating device of an oil receiving machine according to claim 3, characterized in that the driving mechanism (6) comprises a second motor (61) and a driving gear (62), the second motor (61) is arranged at the upper end inside the frame body (11), the driving gear (62) is connected with the output end of the second motor (61), and the driving gear (62) is meshed with the driven gear (24).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323174327.4U CN221141368U (en) | 2023-11-23 | 2023-11-23 | Oil recovery machine's collection oil slick device that circles round |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323174327.4U CN221141368U (en) | 2023-11-23 | 2023-11-23 | Oil recovery machine's collection oil slick device that circles round |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221141368U true CN221141368U (en) | 2024-06-14 |
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ID=91429027
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323174327.4U Active CN221141368U (en) | 2023-11-23 | 2023-11-23 | Oil recovery machine's collection oil slick device that circles round |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221141368U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121024029A (en) * | 2025-10-31 | 2025-11-28 | 榆林学院 | A device and method for remediating petroleum hydrocarbon pollution in surface water. |
-
2023
- 2023-11-23 CN CN202323174327.4U patent/CN221141368U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN121024029A (en) * | 2025-10-31 | 2025-11-28 | 榆林学院 | A device and method for remediating petroleum hydrocarbon pollution in surface water. |
| CN121024029B (en) * | 2025-10-31 | 2026-01-23 | 榆林学院 | A device and method for remediating petroleum hydrocarbon pollution in surface water. |
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