CN215480481U - A centrifugal filter-pressing dewatering device of mud for sewage treatment plant - Google Patents
A centrifugal filter-pressing dewatering device of mud for sewage treatment plant Download PDFInfo
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- CN215480481U CN215480481U CN202121342235.0U CN202121342235U CN215480481U CN 215480481 U CN215480481 U CN 215480481U CN 202121342235 U CN202121342235 U CN 202121342235U CN 215480481 U CN215480481 U CN 215480481U
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- fixedly connected
- dewatering
- box body
- sludge
- sewage treatment
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- 238000003825 pressing Methods 0.000 title claims abstract description 41
- 239000010865 sewage Substances 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 44
- 239000010802 sludge Substances 0.000 claims abstract description 37
- 230000018044 dehydration Effects 0.000 claims abstract description 35
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 35
- 239000004744 fabric Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005096 rolling process Methods 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 1
- 230000002354 daily effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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- Filtration Of Liquid (AREA)
- Treatment Of Sludge (AREA)
- Centrifugal Separators (AREA)
Abstract
The utility model discloses a centrifugal filter-pressing dehydration device for sludge in a sewage treatment plant, which comprises: a box body; a dehydration mechanism which is rotatably connected to the inside of the box body; the power output mechanism is fixedly connected to the upper end of the front end of the box body; the conveying mechanism penetrates through the box body; the dehydration mechanism comprises a dehydration barrel, the front end of the dehydration barrel is provided with a feed inlet, the surface of the dehydration barrel is provided with dehydration holes, the middle part of the dehydration barrel is fixedly connected with a first driven gear, the tail end of the dehydration barrel is provided with a discharge outlet, the inner wall of the dehydration barrel is fixedly provided with filter cloth, and the top end of the interior of the dehydration barrel is fixedly connected with a filter pressing scraper blade; the power output mechanism comprises a first motor, a driving gear is fixedly connected to the driving end of the first motor, a second driven gear is connected to the bottom gear of the driving gear, and the second driven gear is fixedly connected with one end of a driving connecting rod. The device provided by the utility model can realize rapid feeding and discharging while meeting the sludge dewatering effect.
Description
Technical Field
The utility model relates to the technical field of sewage treatment equipment, in particular to a centrifugal filter-pressing dehydration device for sludge in a sewage treatment plant.
Background
An important problem faced by current sewage treatment plants is sludge dehydration, the amount of sludge produced by sewage treatment plants every day is large, and the volume of the sludge is reduced after the sludge is dehydrated so as to facilitate subsequent treatment and disposal. The dehydrator is used for separating solid and liquid from sludge, and the principle of solid-liquid separation is that the mixed liquid flow passes through a filtering system to separate the liquid from the solid. At present, the dewaterers commonly used in sewage plants are mainly divided into two types, namely a centrifugal dewaterer and a plate-and-frame filter press.
The centrifugal dehydrator is high in automation degree, can realize continuous feeding and discharging, is high in treatment efficiency, but is poor in sludge dehydration rate effect, and the water content of the dehydrated sludge can only reach about 80%. Plate and frame filter press degree of automation is lower, and the sludge dewatering effect is better, and the mud moisture content can reach 70% after the dehydration, but this equipment structure is comparatively complicated, and equipment is difficult to restore in the short time when damaging in the use, and filter block ejection of compact and filter cloth dismantlement after the dehydration wash comparatively loaded down with trivial details difficulty in addition, very big reduction work efficiency.
Therefore, a dehydrator which can realize quick feeding and discharging while meeting the sludge dewatering effect and has a simple structure and higher working efficiency needs to be developed.
The information disclosed in this background section is only for enhancement of understanding of the general background of the utility model and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a centrifugal filter-pressing dehydration device for sludge in a sewage treatment plant, which can solve the problems in the prior art.
In order to achieve the aim, the utility model provides a centrifugal filter-pressing dehydration device for sludge of a sewage treatment plant, which comprises: a box body; the dehydration mechanism is rotatably connected inside the box body; the power output mechanism is fixedly connected to the upper end of the front end of the box body; the conveying mechanism penetrates through the box body; the filter pressing device comprises a dewatering mechanism, a filter pressing mechanism and a pressing mechanism, wherein the dewatering mechanism comprises a dewatering cylinder body, the front end of the dewatering cylinder body is provided with a feed inlet, the surface of the dewatering cylinder body is provided with dewatering holes, the middle part of the dewatering cylinder body is fixedly connected with a first driven gear, the tail end of the dewatering cylinder body is provided with a discharge outlet, filter cloth is fixedly arranged on the inner wall of the dewatering cylinder body, and the top end of the inner part of the dewatering cylinder body is fixedly connected with a pressing and filtering scraper; and wherein, power take off mechanism includes first motor, and the drive end fixedly connected with drive gear of first motor, the bottom gear connection of drive gear has second driven gear, and second driven gear and the one end fixed connection of drive connecting rod, the other end fixedly connected with third driven gear of drive connecting rod, form gear connection structure between third driven gear and the first driven gear.
In one or more embodiments, a first bearing is fixedly connected to the front end of the box body, the first bearing is fixedly connected to the driving connecting rod and forms a rotating connection structure, a motor supporting platform is fixedly connected to the bottom of the first motor, and a platform supporting frame is fixedly connected to the position right below the motor supporting platform.
In one or more embodiments, four corners inside the box body are fixedly welded with bearing seats, second bearings are fixedly connected above the bearing seats, bearing tracks are symmetrically formed in two sides of the first driven gear, and a rolling connection structure is formed between the second bearings and the bearing tracks.
In one or more embodiments, the conveying mechanism comprises a supporting plate, a roller support is symmetrically and fixedly welded on the upper surface of the supporting plate, a second motor is fixedly installed at one corner of the supporting plate, a roller is rotatably connected above the roller support, and a driving end of the second motor drives the roller to rotate.
In one or more embodiments, the drive belt has been cup jointed to the roller bearing top, and the fixed welding has the layer board support under the supporting plate, and the equal fixed mounting of lower extreme of layer board support has the gyro wheel, and supporting plate one side corner is fixed with the balancing weight.
In one or more embodiments, a filter cloth pressing strip is fixedly connected to the inner surface of the dehydration cylinder, the filter cloth is located between the filter cloth pressing strip and the inner wall of the dehydration cylinder, the filter cloth pressing strip is of an annular thin sheet structure, a first fixing bolt is fixedly connected to the outer wall of the dehydration cylinder, and the first fixing bolt and the filter cloth pressing strip form a threaded connection structure.
In one or more embodiments, the number of the dewatering holes on the surface of the dewatering cylinder is plural, and the plural dewatering holes are arranged in an array.
In one or more embodiments, a water outlet is formed right below the box body, guide plates are symmetrically fixed to two sides of the water outlet, four support frames are fixedly welded to the bottom of the box body, and second fixing bolts are connected to the upper portion of the box body in a threaded mode.
Compared with the prior art, the centrifugal filter-pressing dehydration device for the sludge of the sewage treatment plant has the following advantages: the utility model combines the advantages of two different dewaterers in the prior art, avoids the respective defects thereof, and develops the dewaterer which can meet the sludge dewatering effect, can realize quick feeding and discharging, and has simple structure and higher working efficiency. Specifically, the method comprises the following steps:
1. according to the centrifugal filter-pressing dewatering device, the power output mechanism, the dewatering mechanism and the box body are arranged, the power output mechanism transmits power to the driving connecting rod through the driving end, the driving connecting rod drives the third driven gear through the first driven gear, so that the dewatering cylinder is driven to rotate at a high speed to achieve the purpose of centrifugal filter-pressing dewatering, the cylinder is reversed after dewatering is completed, dewatered sludge is scraped, and therefore the three processes of sludge feeding, dewatering and discharging are completed. The device has the advantages of simple structure, fewer used parts, simple use and operation of equipment, simple daily maintenance, and labor and maintenance cost saving of the equipment.
2. The filter cloth is fixedly arranged on the inner wall of the dewatering cylinder, and after the sludge is dewatered for multiple times in the cylinder, although most of the sludge dewatered each time is removed from the dewatering cylinder, a small amount of sludge still remains on the surface of the filter cloth, and the sludge blocks the pores of the filter cloth after long-time work, so that the efficiency of the dewatering process is reduced.
Drawings
FIG. 1 is a front sectional view of a centrifugal filter-press dewatering device for sludge from a sewage treatment plant according to an embodiment of the present invention.
FIG. 2 is a side view of a centrifugal filter-press dewatering device for sewage treatment plant sludge according to one embodiment of the present invention.
Fig. 3 is a schematic structural view of a dehydration mechanism according to an embodiment of the present invention.
Fig. 4 is a sectional view of a dehydrating mechanism according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a power output mechanism according to an embodiment of the utility model.
Fig. 6 is a schematic structural view of a conveying mechanism according to an embodiment of the present invention.
Description of the main reference numerals:
1-box body, 2-dewatering mechanism, 3-power output mechanism, 4-bearing seat, 5-second bearing, 6-water outlet, 7-guide plate, 8-support frame, 9-conveying mechanism, 10-second fixing bolt, 201-dewatering cylinder body, 202-material inlet, 203-dewatering hole, 204-first driven gear, 205-bearing track, 206-material outlet, 207-filter cloth, 208-filter cloth pressing bar, 209-first fixing bolt, 210-filter pressing scraper, 301-first motor, 302-driving gear, 303-second driven gear, 304-driving connecting rod, first bearing, 306-third driven gear, 901-supporting plate, 902-roller support, 903-roller, 904-drive belt, 905-pallet support, 906-roller, 907-counterweight, 908-second motor.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 1 to 6, a centrifugal filter-press dewatering device for sludge of a sewage treatment plant according to an embodiment of the present invention includes: the device comprises a box body 1, a dehydration mechanism 2, a power output mechanism 3 and a conveying mechanism 9, wherein the dehydration mechanism 2 is rotatably connected in the box body 1. The upper end of the front end of the box body 1 is fixedly connected with a power output mechanism 3, and a conveying mechanism 9 penetrates through the box body 1.
Specifically, as shown in fig. 3 to 5, the dewatering mechanism 2 includes a dewatering cylinder 201, a feed inlet 202 is provided at the front end of the dewatering cylinder 201, dewatering holes 203 are provided on the surface of the dewatering cylinder 201, a first driven gear 204 is fixedly connected to the middle of the dewatering cylinder 201, a discharge outlet 206 is provided at the end of the dewatering cylinder 201, a filter cloth 207 is fixedly installed on the inner wall of the dewatering cylinder 201, and a filter pressing scraper 210 is fixedly connected to the top end of the inside of the dewatering cylinder 201. And the power output mechanism 3 comprises a first motor 301, a driving gear 302 is fixedly connected to a driving end of the first motor 301, a second driven gear 303 is connected to a bottom gear of the driving gear 302, the second driven gear 303 is fixedly connected with one end of a driving link 304, a third driven gear 306 is fixedly connected to the other end of the driving link 304, and a gear connection structure is formed between the third driven gear 306 and the first driven gear 204.
Specifically, as shown in fig. 1 to 5, a first bearing 305 is fixedly connected to the front end of the box 1, and the first bearing 305 is fixedly connected to the driving link 304 to form a rotating connection structure. The bottom of the first motor 301 is fixedly connected with a motor supporting platform 307, and a platform supporting frame 308 is fixedly connected under the motor supporting platform 307. The bearing seat 4 is fixedly welded at four corners inside the box body 1, the second bearing 5 is fixedly connected above the bearing seat 4, the bearing tracks 205 are symmetrically arranged on two sides of the first driven gear 204, and a rolling connection structure is formed between the second bearing 5 and the bearing tracks 205.
Specifically, as shown in fig. 3-4, a filter cloth pressing strip 208 is fixedly connected to the inner surface of the dewatering cylinder 201, the filter cloth 207 is located between the filter cloth pressing strip 208 and the inner wall of the dewatering cylinder 201, the filter cloth pressing strip 208 is of an annular sheet structure, a first fixing bolt 209 is fixedly connected to the outer wall of the dewatering cylinder 201, and the first fixing bolt 209 and the filter cloth pressing strip 208 form a threaded connection structure.
Further, the number of the dewatering holes 203 on the surface of the dewatering cylinder 201 is multiple, and the plurality of dewatering holes 203 are arranged in an array.
Specifically, as shown in fig. 6, the conveying mechanism 9 includes a supporting plate 901, a roller bracket 902 is symmetrically and fixedly welded on the upper surface of the supporting plate 901, a second motor 908 is fixedly installed at a corner of one side of the supporting plate 901, a roller 903 is rotatably connected above the roller bracket 902, and a driving end of the second motor 908 drives the roller 903 to rotate.
Further, a driving belt 904 is sleeved above the roller 903, and the width of the driving belt 904 is slightly smaller than the discharge hole 206. Supporting plate 901 is directly under fixed welding have a layer board support 905, the equal fixed mounting of lower extreme of layer board support 905 has gyro wheel 906, supporting plate 901 one side corner is fixed with balancing weight 907.
Further, as shown in fig. 1, a water outlet 6 is formed right below the box body 1, guide plates 7 are symmetrically fixed to two sides of the water outlet 6, four support frames 8 are fixedly welded to the bottom of the box body 1, and second fixing bolts 10 are in threaded connection with the upper portion of the box body 1.
Further, a direction controller 309 is arranged at the front end of the power output mechanism 3 for controlling the dewatering cylinder 201 to rotate counterclockwise. The filter press scraper 210 has an arc structure, and when the dewatering cylinder 201 rotates counterclockwise, the filter press scraper 210 can scrape off the mud cake attached to the surface of the filter cloth 207 and drop on the conveyor belt 904.
The working principle of the utility model is described below:
before the centrifugal filter-pressing dehydration device for the sludge in the sewage treatment plant operates, the sludge conveying pipeline is connected to the feeding port 202, then the slurry enters the dewatering cylinder 201, the sludge conveying is closed when the slurry reaches the rated amount, then the first motor 301 is started, the driving end of the first motor 301 drives the driving gear 302 to rotate, the driving gear 302 is meshed with the second driven gear 303 to transmit power to the driving connecting rod 304, the driving connecting rod 304 is meshed and connected with the first driven gear 204 through the third driven gear 306, under the support of the bearing seat 4 and the second bearing 5, the dehydration cylinder 201 is driven to rotate clockwise at a high speed, sludge is tightly attached to the inner wall of the dehydration cylinder 201 under the action of high-speed centrifugal force, the filter cloth pressing strip 208 in the dehydration cylinder 201 tightly presses the filter cloth 207 on the inner wall of the dehydration cylinder 201, meanwhile, under the squeezing action of the filter pressing scraper, residual moisture in the sludge enters the box body 1 along the dewatering holes 203 through the filter cloth 207. Under the action of the guide plate 7, water flow is converged to the water outlet 6, and filtered clean water is discharged out of the tank body along the water outlet 6. After the dehydration is completed, the pushing and conveying mechanism 9 is pushed into the dehydration cylinder 201 by the roller 906, and is positioned right below the filter pressing scraper 210. At this time, the direction controller 309 controls the dewatering cylinder 201 to rotate counterclockwise, the end of the filter pressing scraper 210 and the inner wall of the dewatering cylinder 201 are in sliding filter pressing operation when the filter pressing scraper 210 rotates clockwise due to the arc structure, when the dewatering cylinder 201 rotates counterclockwise, the filter pressing scraper 210 scrapes off the mud cake attached to the surface of the filter cloth 207 and falls on the conveyor belt 904, and the width of the conveyor belt 904 is slightly smaller than the discharge port 206, so that the scraped mud cake can be completely received. Then the second motor 908 drives the conveyor belt 904 to rotate, the mud cake is sent out of the drum 201, when the filter cloth 207 is used for a certain time, the filter cloth 207 needs to be cleaned, at the moment, the first fixing bolt 209 is detached, the filter cloth pressing strips 208 are completely detached, finally the filter cloth 207 is detached and cleaned, and after the cleaning is finished, the filter cloth is installed according to the reverse flow.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the utility model to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the utility model and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the utility model and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the utility model be defined by the claims and their equivalents.
Claims (8)
1. The utility model provides a centrifugal filter-pressing dewatering device of sewage treatment plant mud which characterized in that includes:
a box body (1);
the dehydration mechanism (2), the dehydration mechanism (2) is rotatably connected to the inside of the box body (1);
the power output mechanism (3), the said power output mechanism (3) is fixedly connected to the upper end of the front end of the said container body (1); and
the conveying mechanism (9), the said conveying mechanism (9) is set up in the inside of the said container body (1) through;
the dewatering mechanism (2) comprises a dewatering cylinder body (201), a feed inlet (202) is formed in the front end of the dewatering cylinder body (201), dewatering holes (203) are formed in the surface of the dewatering cylinder body (201), a first driven gear (204) is fixedly connected to the middle of the dewatering cylinder body (201), a discharge outlet (206) is formed in the tail end of the dewatering cylinder body (201), filter cloth (207) is fixedly installed on the inner wall of the dewatering cylinder body (201), and a filter pressing scraper plate (210) is fixedly connected to the top end of the interior of the dewatering cylinder body (201);
and the power output mechanism (3) comprises a first motor (301), a driving gear (302) is fixedly connected to the driving end of the first motor (301), a second driven gear (303) is connected to the bottom gear of the driving gear (302), the second driven gear (303) is fixedly connected with one end of a driving connecting rod (304), a third driven gear (306) is fixedly connected to the other end of the driving connecting rod (304), and a gear connection structure is formed between the third driven gear (306) and the first driven gear (204).
2. The centrifugal filter-press dewatering device for sludge in sewage treatment plants according to claim 1, characterized in that a first bearing (305) is fixedly connected to the front end of the box body (1), the first bearing (305) is fixedly connected with a driving connecting rod (304) and forms a rotary connection structure, a motor supporting platform (307) is fixedly connected to the bottom of the first motor (301), and a platform supporting frame (308) is fixedly connected to the position right below the motor supporting platform (307).
3. The centrifugal filter-press dewatering device for sludge in sewage treatment plants according to claim 2, characterized in that bearing seats (4) are fixedly welded at four corners inside the box body (1), second bearings (5) are fixedly connected above the bearing seats (4), bearing rails (205) are symmetrically arranged on two sides of the first driven gear (204), and a rolling connection structure is formed between the second bearings (5) and the bearing rails (205).
4. The centrifugal filter-press dewatering device for sludge in sewage treatment plants according to claim 3, characterized in that the conveying mechanism (9) comprises a supporting plate (901), a roller bracket (902) is symmetrically and fixedly welded on the upper surface of the supporting plate (901), a second motor (908) is fixedly installed at one corner of the supporting plate, a roller (903) is rotatably connected above the roller bracket (902), and the driving end of the second motor (908) drives the roller (903) to rotate.
5. The centrifugal filter-press dewatering device for sludge in sewage treatment plants according to claim 4, characterized in that a transmission belt (904) is sleeved above the rolling shaft (903), a supporting plate bracket (905) is fixedly welded right below the supporting plate (901), rollers (906) are fixedly installed at the lower ends of the supporting plate bracket (905), and a balancing weight (907) is fixed at a corner of one side of the supporting plate (901).
6. The centrifugal filter-press dewatering device for sludge in a sewage treatment plant according to claim 5, characterized in that a filter cloth pressing strip (208) is fixedly connected to the inner surface of the dewatering cylinder (201), the filter cloth (207) is located between the filter cloth pressing strip (208) and the inner wall of the dewatering cylinder (201), the filter cloth pressing strip (208) is of an annular thin sheet structure, a first fixing bolt (209) is fixedly connected to the outer wall of the dewatering cylinder (201), and the first fixing bolt (209) and the filter cloth pressing strip (208) form a threaded connection structure.
7. The centrifugal filter-press dewatering device for sludge in sewage treatment plants according to claim 6, characterized in that the number of the dewatering holes (203) on the surface of the dewatering cylinder (201) is multiple, and the plurality of the dewatering holes (203) are arranged in an array.
8. The centrifugal filter-pressing dewatering device for sludge in a sewage treatment plant according to claim 7, characterized in that a water outlet (6) is formed right below the box body (1), guide plates (7) are symmetrically fixed on two sides of the water outlet (6), four support frames (8) are fixedly welded on the bottom of the box body (1), and second fixing bolts (10) are connected to the upper portion of the box body (1) in a threaded manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121342235.0U CN215480481U (en) | 2021-06-17 | 2021-06-17 | A centrifugal filter-pressing dewatering device of mud for sewage treatment plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121342235.0U CN215480481U (en) | 2021-06-17 | 2021-06-17 | A centrifugal filter-pressing dewatering device of mud for sewage treatment plant |
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| CN215480481U true CN215480481U (en) | 2022-01-11 |
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| CN202121342235.0U Active CN215480481U (en) | 2021-06-17 | 2021-06-17 | A centrifugal filter-pressing dewatering device of mud for sewage treatment plant |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114410704A (en) * | 2022-02-15 | 2022-04-29 | 上海云洛生物技术有限公司 | Method for biologically synthesizing vitronectin |
| CN114804576A (en) * | 2022-05-21 | 2022-07-29 | 那自恒 | Self-cleaning sludge dewatering machine and use method thereof |
-
2021
- 2021-06-17 CN CN202121342235.0U patent/CN215480481U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114410704A (en) * | 2022-02-15 | 2022-04-29 | 上海云洛生物技术有限公司 | Method for biologically synthesizing vitronectin |
| CN114804576A (en) * | 2022-05-21 | 2022-07-29 | 那自恒 | Self-cleaning sludge dewatering machine and use method thereof |
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Effective date of registration: 20240726 Address after: Room 2020-204, 2nd Floor, Building 2, No.12 Deshengmenwai Street, Xicheng District, Beijing 100032 Patentee after: AVIC Engineering Consulting (Beijing) Co.,Ltd. Country or region after: China Address before: No. 12 Dewai Street, Xicheng District, Beijing, 100120 Patentee before: CHINA AVIATION PLANNING AND DESIGN INSTITUTE (Group) Co.,Ltd. Country or region before: China |