CN111804018A - Sedimentation tank for sewage treatment - Google Patents
Sedimentation tank for sewage treatment Download PDFInfo
- Publication number
- CN111804018A CN111804018A CN202010677971.5A CN202010677971A CN111804018A CN 111804018 A CN111804018 A CN 111804018A CN 202010677971 A CN202010677971 A CN 202010677971A CN 111804018 A CN111804018 A CN 111804018A
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- China
- Prior art keywords
- sedimentation tank
- wall
- sewage treatment
- sewage
- tank body
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0042—Baffles or guide plates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0045—Plurality of essentially parallel plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/0039—Settling tanks provided with contact surfaces, e.g. baffles, particles
- B01D21/0048—Plurality of plates inclined in alternating directions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/02—Settling tanks with single outlets for the separated liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/24—Feed or discharge mechanisms for settling tanks
- B01D21/2405—Feed mechanisms for settling tanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/80—Mixing plants; Combinations of mixers
- B01F33/82—Combinations of dissimilar mixers
- B01F33/822—Combinations of dissimilar mixers with moving and non-moving stirring devices in the same receptacle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/305—Treatment of water, waste water or sewage
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
Abstract
The invention discloses a sedimentation tank for sewage treatment, which comprises a sedimentation tank body, wherein a mixing shell is arranged on the outer wall of one side of the sedimentation tank body, a feeding funnel is arranged on the outer wall of the top of the mixing shell, a discharge box with a conical structure is arranged on the inner wall of the top of the mixing shell, uniformly distributed discharge holes are formed in the circumferential position of the outer wall of the top of the discharge box, and a transition funnel and a guide plate are alternately connected to the inner wall of the circumference of the mixing shell through fastening bolts. According to the sewage treatment device, sewage to be treated is injected into the mixing shell through the feeding funnel, meanwhile, the medicament is injected into the discharging box, the medicament overflows from the discharging port and is mixed with the sewage, the mixture of the medicament and the sewage sequentially and alternately flows through the transition funnel and the guide plate, so that the medicament and the sewage are fully mixed, the sewage mixture after the mixing at the bottom of the mixing shell is pumped by the delivery pump is injected into the feeding pipe to realize feeding, and the sewage treatment device has the function of effectively mixing the medicament and the sewage.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a sedimentation tank for sewage treatment.
Background
The sewage treatment equipment is an industrial equipment capable of effectively treating domestic sewage, industrial wastewater and the like in urban areas, prevents sewage and pollutants from directly flowing into water areas, and has important significance for improving ecological environment, improving urban grade and promoting economic development.
Through the retrieval, chinese patent publication is CN 208869368U's patent, discloses a sedimentation tank for high-efficient environmental protection sewage treatment, which comprises a housin, control switch is installed to the left surface outside of casing, the middle part of casing separates for three vertical chamber through baffle and separator, the upper end of separator is equipped with the water conservancy diversion window, the baffle left surface distributes along vertical direction has the guide plate, the baffle middle part in guide plate clearance is equipped with the hole that looses. The sedimentation tank for high-efficiency environment-friendly sewage treatment in the patent has the following defects: when in use, the utility model does not have the function of mixing the sewage and the medicament.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a sedimentation tank for sewage treatment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a sedimentation tank for sewage treatment comprises a sedimentation tank body, wherein a mixing shell is arranged on the outer wall of one side of the sedimentation tank body, a feeding funnel is arranged on the outer wall of the top of the mixing shell, a discharging box with a conical structure is arranged on the inner wall of the top of the mixing shell, uniformly distributed discharging holes are formed in the circumferential position of the outer wall of the top of the discharging box, a transition funnel and a guide plate are alternately connected to the circumferential inner wall of the mixing shell through fastening bolts, a gap is reserved between the bottom of the circumference of the guide plate and the circumferential inner wall of the mixing shell, the transition funnel is of a funnel-shaped structure, the guide plate is of a conical structure, a feeding hole is formed in the circle center of the outer wall of the bottom of the transition funnel, the opening position of the feeding hole corresponds to the circle center position of the top of the guide plate, a conveying pump is arranged on the outer wall of one, the top of the outer wall of one side of the sedimentation tank body, which is far away from the mixing shell, is spliced with a water outlet pipe.
Preferably, the outer wall of the bottom of the mixing shell is provided with a driving motor, and an output shaft of the driving motor is provided with a rotating shaft.
Preferably, the rotating shaft penetrates through the circle centers of the guide plate and the transition funnel, the circumference of the rotating shaft is connected with the guide plate through a bearing, and the rotating shaft extends to the top of the transition funnel through the feeding hole.
Preferably, the circumference of the rotating shaft is provided with a stirring rod, and the stirring rod is positioned between the transition funnel and the discharging box and between the transition funnel and the guide plate.
Preferably, a second poke rod is obliquely arranged on the circumference of the rotating shaft, and the position of the second poke rod corresponds to the circumferential inner wall of the transition funnel.
Preferably, the circumference of the rotating shaft is provided with a first poke rod which is obliquely arranged, and the position of the first poke rod corresponds to the circumferential outer wall of the guide plate.
Preferably, the bottom of the first poke rod and the bottom of the second poke rod are both provided with uniformly distributed extending teeth, and one side of the second poke rod is provided with uniformly distributed through holes.
Preferably, the inner wall of the top of the sedimentation tank body is provided with first baffles which are uniformly distributed, the inner wall of the bottom of the sedimentation tank body is provided with second baffles which are uniformly distributed, and the second baffles and the first baffles are arranged in a staggered manner.
Preferably, the bottom of sedimentation tank body both sides inner wall is equipped with the arc of crisscross setting, and the intrados of arc is down, and the arc is located between two adjacent second baffles, and one side outer wall of sedimentation tank body is equipped with the sludge pump.
Preferably, one side that the inner wall of sedimentation tank body bottom is close to the material loading pipe is equipped with evenly distributed's dead lever, and the circumference department of dead lever is equipped with evenly distributed's barb.
The invention has the beneficial effects that:
1. according to the sedimentation tank for sewage treatment, the mixing shell, the discharging box, the transition funnel and the guide plate are arranged, sewage to be treated is injected into the mixing shell through the feeding funnel, meanwhile, the medicament is injected into the discharging box, the medicament overflows from the discharging port and is mixed with the sewage, the mixture of the medicament and the sewage sequentially and alternately flows through the transition funnel and the guide plate, so that the medicament and the sewage are fully mixed, the sewage mixture after the mixing at the bottom of the mixing shell is extracted by the delivery pump and is injected into the feeding pipe to realize feeding, and the sedimentation tank has the function of effectively mixing the medicament and the sewage.
2. According to the sedimentation tank for sewage treatment, the rotating shaft, the first poke rod and the second poke rod are arranged, so that the first poke rod and the second poke rod can be driven by the rotating shaft to stir a mixture flowing on the outer wall of the guide plate and the inner wall of the transition funnel, and the mixing effect is improved.
3. According to the sedimentation tank for sewage treatment, the first baffle and the second baffle are arranged, and buffer is carried out on sewage fed into the sedimentation tank body through the first baffle and the second baffle, so that the sewage is ensured to be gradually calm in the process of flowing to the water outlet pipe in the sedimentation tank body, and effective sedimentation is realized.
4. According to the sedimentation tank for sewage treatment, the arc-shaped plate, the fixing rod and the barb are arranged, the arc-shaped plate buffers and limits sewage and sediments at the bottom of the sedimentation tank body, the sediment is prevented from being washed away by subsequent sewage to affect sedimentation efficiency, the fixing rod and the barb buffer the fed sewage, the sewage is guaranteed to be timely and effectively calm, and the barb prevents the sediment from being washed away by the fed sewage.
Drawings
FIG. 1 is a schematic view showing the construction of a settling tank for sewage treatment proposed in example 1;
FIG. 2 is a partial sectional view showing the construction of a mixing casing of a sedimentation tank for sewage treatment according to example 1;
FIG. 3 is a schematic view showing the overall construction of a settling tank for sewage treatment as set forth in example 1;
fig. 4 is a sectional view showing a side structure of a settling tank body of a settling tank for sewage treatment as proposed in example 2.
In the figure: 1 sedimentation tank body, 2 first baffle, 3 material loading pipes, 4 material loading funnels, 5 play magazine, 6 mixed casings, 7 stirring rods, 8 first poker bars, 9 guide plates, 10 transition funnels, 11 delivery pumps, 12 pivot, 13 driving motor, 14 sludge pump, 15 dead levers, 16 arc, 17 second baffle, 18 outlet pipes, 19 second poker bars, 20 material loading holes, 21 barb.
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.
Example 1
Referring to fig. 1-3, a sedimentation tank for sewage treatment comprises a sedimentation tank body 1, wherein the outer wall of one side of the sedimentation tank body 1 is connected with a mixing shell 6 through a fastening bolt, the outer wall of the top of the mixing shell 6 is connected with a feeding funnel 4 through a fastening bolt, the inner wall of the top of the mixing shell 6 is connected with a discharging box 5 with a conical structure through a fastening bolt, the circumference of the outer wall of the top of the discharging box 5 is provided with uniformly distributed discharging holes, the inner wall of the circumference of the mixing shell 6 is alternately connected with a transition funnel 10 and a guide plate 9 through a fastening bolt, a gap is left between the bottom of the circumference of the guide plate 9 and the inner wall of the circumference of the mixing shell 6, the transition funnel 10 is of a funnel type structure, the guide plate 9 is of a conical structure, the center of the outer wall of the bottom of the transition funnel 10 is provided with a, mix one side outer wall of casing 6 and be connected with delivery pump 11 through fastening bolt, it has feeding pipe 3 to peg graft in one side that 1 top outer wall of sedimentation tank body is close to mixing casing 6, it has outlet pipe 18 to peg graft in one side outer wall top that mixing casing 6 was kept away from to sedimentation tank body 1, sewage with pending pours into mixing casing 6 into through loading funnel 4 in, pour into the medicament into to play magazine 5 simultaneously, the medicament spills over and mixes with sewage from the discharge gate, the medicament flows through transition funnel 10 and guide plate 9 in proper order in turn with the mixture of sewage, make medicament and sewage mix fully, delivery pump 11 extracts and mixes the sewage mixture injection feeding pipe 3 after the casing 6 bottom mixes the completion and realizes the material loading, possess the function with medicament and sewage effective mixture.
In the invention, the outer wall of the bottom of the mixing shell 6 is connected with a driving motor 13 through a fastening bolt, and the output shaft of the driving motor 13 is connected with a rotating shaft 12 through the fastening bolt.
Wherein, the pivot 12 runs through the centre of a circle of guide plate 9 and transition funnel 10, and the circumference of pivot 12 passes through the bearing with guide plate 9 and is connected, and pivot 12 extends to the top of transition funnel 10 through material loading hole 20, and sewage flows downwards through the clearance between material loading hole 20 and the pivot 12.
Wherein, the circumference department of pivot 12 is connected with stirring rod 7 through fastening bolt, and stirring rod 7 is located between transition funnel 10 and the ejection of compact box 5, between transition funnel 10 and guide plate 9, and pivot 12 drives stirring rod 7 and stirs the mixture that will fall into transition funnel 10 and mix.
Wherein, the circumference of the rotating shaft 12 is connected with a second poking rod 19 which is obliquely arranged through a fastening bolt, and the position of the second poking rod 19 corresponds to the circumferential inner wall of the transition funnel 10.
Wherein, the circumference department of pivot 12 is connected with the first poker rod 8 that the slope set up through fastening bolt, and the position of first poker rod 8 is corresponding with the circumference outer wall of guide plate 9, and accessible pivot 12 drives first poker rod 8 and second poker rod 19 and stirs guide plate 9 outer wall, the mobile mixture of transition funnel 10 inner wall, improves mixed effect.
Wherein, the bottom of first poker rod 8 and second poker rod 19 all is connected with evenly distributed's the tooth that extends through fastening bolt, and evenly distributed's perforation is seted up to one side of second poker rod 19, extends the tooth and stirs the mixture, improves stirring mixing efficiency.
Wherein, the top inner wall of sedimentation tank body 1 is connected with evenly distributed's first baffle 2 through fastening bolt, and the bottom inner wall of sedimentation tank body 1 is connected with evenly distributed's second baffle 17 through fastening bolt, second baffle 17 and the crisscross setting of first baffle 2, first baffle 2 and second baffle 17 cushion the sewage of material loading to sedimentation tank body 1, guarantee that sewage is calm gradually and realize effectively deposiing to the in-process of outlet pipe 18 in sedimentation tank body 1.
Wherein, the bottom of 1 both sides inner wall of sedimentation tank body has crisscross arc 16 that sets up through fastening bolt connection, and the intrados of arc 16 is down, arc 16 is located between two adjacent second baffles 17, one side outer wall of sedimentation tank body 1 is connected with sludge pump 14 through fastening bolt, arc 16 cushions spacingly to the sewage and the precipitate of 1 bottom of sedimentation tank body, avoid the precipitate to be washed up by follow-up sewage and influence precipitation efficiency, the accumulational mud in 1 bottom of sedimentation tank body is taken out from to accessible sludge pump 14.
The working principle is as follows: sewage to be treated is injected into a mixing shell 6 through a feeding funnel 4, meanwhile, a medicament is injected into a discharging box 5, the medicament overflows from a discharging port and is mixed with the sewage, the mixture of the medicament and the sewage sequentially and alternately flows through a transition funnel 10 and a guide plate 9, so that the medicament and the sewage are fully mixed, a conveying pump 11 extracts the sewage mixture mixed at the bottom of the mixing shell 6 and injects the sewage mixture into a feeding pipe 3 to realize feeding, the function of effectively mixing the medicament and the sewage is achieved, the sewage flows downwards through a gap between a feeding hole 20 and a rotating shaft 12, the rotating shaft 12 drives a stirring rod 7 to stir and mix the mixture which falls into the transition funnel 10, the rotating shaft 12 can drive a first stirring rod 8 and a second stirring rod 19 to stir the mixture flowing at the outer wall of the guide plate 9 and the inner wall of the transition funnel 10, the mixing effect is improved, a first baffle plate 2 and a second baffle plate 17 buffer the sewage fed into a sedimentation tank body 1, guarantee that sewage is calm gradually and realize effectively deposiing to the in-process of outlet pipe 18 in sedimentation tank body 1, the arc 16 cushions spacingly to the sewage and the precipitate of sedimentation tank body 1 bottom, avoids the precipitate to be washed up by follow-up sewage and influences precipitation efficiency, and accessible sludge pump 14 takes out the accumulational mud in sedimentation tank body 1 bottom.
Example 2
Referring to fig. 4, a sedimentation tank for sewage treatment, this embodiment compares in embodiment 1, and one side that sedimentation tank body 1 bottom inner wall is close to material loading pipe 3 is connected with evenly distributed's dead lever 15 through fastening bolt, and the circumference department of dead lever 15 is connected with evenly distributed's barb 21 through fastening bolt.
The working principle is as follows: dead lever 15 and barb 21 cushion the sewage of material loading, guarantee that sewage is timely effectual calm, and barb 21 avoids the precipitate to be washed away by the sewage of material loading.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A sedimentation tank for sewage treatment comprises a sedimentation tank body (1) and is characterized in that a mixing shell (6) is arranged on the outer wall of one side of the sedimentation tank body (1), a feeding funnel (4) is arranged on the outer wall of the top of the mixing shell (6), a material discharging box (5) with a conical structure is arranged on the inner wall of the top of the mixing shell (6), uniformly distributed discharge ports are formed in the circumferential position of the outer wall of the top of the material discharging box (5), a transition funnel (10) and a guide plate (9) are alternately connected to the inner wall of the circumference of the mixing shell (6) through fastening bolts, a gap is reserved between the bottom of the circumference of the guide plate (9) and the inner wall of the circumference of the mixing shell (6), the transition funnel (10) is of a funnel-shaped structure, the guide plate (9) is of a conical structure, and a feeding hole (20) is formed in the circle, and the opening position of the feeding hole (20) corresponds to the top circle center position of the guide plate (9), the outer wall of one side of the mixing shell (6) is provided with a delivery pump (11), the side, close to the mixing shell (6), of the outer wall of the top of the sedimentation tank body (1) is spliced with a feeding pipe (3), and the top of the outer wall of one side, far away from the mixing shell (6), of the sedimentation tank body (1) is spliced with a water outlet pipe (18).
2. A sewage treatment sedimentation tank as claimed in claim 1, wherein the outer wall of the bottom of the mixing housing (6) is provided with a driving motor (13), and an output shaft of the driving motor (13) is provided with a rotating shaft (12).
3. A sedimentation tank for sewage treatment according to claim 2, wherein the rotation shaft (12) penetrates through the centers of the guide plate (9) and the transition funnel (10), the circumference of the rotation shaft (12) is connected with the guide plate (9) through a bearing, and the rotation shaft (12) extends to the top of the transition funnel (10) through the feeding hole (20).
4. A sedimentation tank for sewage treatment according to claim 3, wherein a stirring rod (7) is provided at the circumference of the rotation shaft (12), and the stirring rod (7) is located between the transition funnel (10) and the discharge box (5) and between the transition funnel (10) and the guide plate (9).
5. A sedimentation tank for sewage treatment according to claim 4, characterized in that a second poke rod (19) is obliquely arranged at the circumference of the rotation shaft (12), and the position of the second poke rod (19) corresponds to the circumferential inner wall of the transition funnel (10).
6. A sedimentation tank for sewage treatment according to claim 5, characterized in that a first poke rod (8) is obliquely arranged at the circumference of the rotary shaft (12), and the position of the first poke rod (8) corresponds to the circumferential outer wall of the guide plate (9).
7. A sedimentation tank for sewage treatment according to claim 6, characterized in that the bottom of the first and second poke rods (8, 19) are provided with evenly distributed extending teeth, and one side of the second poke rod (19) is provided with evenly distributed perforations.
8. A sedimentation tank for sewage treatment according to claim 7, characterized in that the inner wall of the top of the sedimentation tank body (1) is provided with evenly distributed first baffles (2), and the inner wall of the bottom of the sedimentation tank body (1) is provided with evenly distributed second baffles (17), and the second baffles (17) and the first baffles (2) are arranged in a staggered manner.
9. A sedimentation tank for sewage treatment according to claim 8, characterized in that the bottom of the inner wall of the sedimentation tank body (1) on both sides is provided with arc plates (16) which are arranged in a staggered manner, the inner arc surfaces of the arc plates (16) face downwards, the arc plates (16) are positioned between two adjacent second baffles (17), and the outer wall of one side of the sedimentation tank body (1) is provided with a sludge pump (14).
10. A sedimentation tank for sewage treatment according to claim 9, characterized in that the sedimentation tank body (1) is provided with evenly distributed fixing rods (15) at the side of the inner wall of the bottom near the feeding pipe (3), and barbs (21) are evenly distributed at the circumference of the fixing rods (15).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010677971.5A CN111804018A (en) | 2020-07-15 | 2020-07-15 | Sedimentation tank for sewage treatment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010677971.5A CN111804018A (en) | 2020-07-15 | 2020-07-15 | Sedimentation tank for sewage treatment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111804018A true CN111804018A (en) | 2020-10-23 |
Family
ID=72864809
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010677971.5A Withdrawn CN111804018A (en) | 2020-07-15 | 2020-07-15 | Sedimentation tank for sewage treatment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111804018A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728264A (en) * | 2020-12-31 | 2021-04-30 | 辽宁希泰科技有限公司 | Mechanical sealing device for corrugated pipe |
| CN113634044A (en) * | 2021-08-10 | 2021-11-12 | 安徽广信农化股份有限公司 | Liquid concentration and purification device for indoxacarb production and working method thereof |
| CN117383636A (en) * | 2023-12-11 | 2024-01-12 | 国家海洋局北海海洋工程勘察研究院 | Device and method for removing microplastic in sediment |
-
2020
- 2020-07-15 CN CN202010677971.5A patent/CN111804018A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112728264A (en) * | 2020-12-31 | 2021-04-30 | 辽宁希泰科技有限公司 | Mechanical sealing device for corrugated pipe |
| CN112728264B (en) * | 2020-12-31 | 2021-07-30 | 辽宁希泰科技有限公司 | Mechanical sealing device for corrugated pipe |
| CN113634044A (en) * | 2021-08-10 | 2021-11-12 | 安徽广信农化股份有限公司 | Liquid concentration and purification device for indoxacarb production and working method thereof |
| CN117383636A (en) * | 2023-12-11 | 2024-01-12 | 国家海洋局北海海洋工程勘察研究院 | Device and method for removing microplastic in sediment |
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Application publication date: 20201023 |
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| WW01 | Invention patent application withdrawn after publication |