CN112095771B - Urban sewage is from preliminary clearance preventing block's energy-concerving and environment-protective device - Google Patents
Urban sewage is from preliminary clearance preventing block's energy-concerving and environment-protective device Download PDFInfo
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- CN112095771B CN112095771B CN202011008879.6A CN202011008879A CN112095771B CN 112095771 B CN112095771 B CN 112095771B CN 202011008879 A CN202011008879 A CN 202011008879A CN 112095771 B CN112095771 B CN 112095771B
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- spring
- transmission rod
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- 239000010865 sewage Substances 0.000 title claims abstract description 39
- 238000004140 cleaning Methods 0.000 claims abstract description 57
- 230000005540 biological transmission Effects 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 10
- 239000010813 municipal solid waste Substances 0.000 claims abstract description 6
- 238000001125 extrusion Methods 0.000 claims description 38
- 239000007788 liquid Substances 0.000 claims description 12
- 239000002386 air freshener Substances 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 6
- 239000000796 flavoring agent Substances 0.000 description 6
- 235000019634 flavors Nutrition 0.000 description 6
- 239000011550 stock solution Substances 0.000 description 6
- 238000007689 inspection Methods 0.000 description 4
- 239000012629 purifying agent Substances 0.000 description 4
- 238000005507 spraying Methods 0.000 description 4
- 238000012546 transfer Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000001877 deodorizing effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005381 potential energy Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F9/00—Arrangements or fixed installations methods or devices for cleaning or clearing sewer pipes, e.g. by flushing
- E03F9/002—Cleaning sewer pipes by mechanical means
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sewage (AREA)
Abstract
The invention relates to the technical field of sewage treatment, and discloses an anti-clogging energy-saving and environment-friendly device for automatically and primarily cleaning urban sewage, which comprises a bearing cover, wherein a drain hole is formed in the middle of the bearing cover, the bottom of the bearing cover is movably connected with a connecting rod, the bottom of the connecting rod is movably connected with a transmission rod, the bottom of the transmission rod is movably connected with a return spring, the right side of the transmission rod is movably connected with a rotating wheel, the bottom of the rotating wheel is movably connected with a pull rod, the pull rod moves in the vertical direction to push a supporting seat to extrude a cleaning spring and deform the cleaning spring, an upward thrust is further applied to a cleaning seat, the thrust is transmitted to the cleaning rod through the cleaning seat and finally drives the cleaning rod to reciprocate in the vertical direction, and the cleaning rod can drag garbage blocked at the top of the drain hole into the drain hole in the reciprocating motion process, so that the effect of automatically cleaning the drain hole and improving the sewage treatment efficiency is achieved when the sewer is blocked.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an anti-clogging energy-saving environment-friendly device for preliminary cleaning of urban sewage.
Background
Along with the development of social economy and the promotion of the number of global population, a large amount of sewage can be generated in cities every day, and the sewage cannot be directly discharged into the nature, otherwise, the influence on the natural environment can be caused, so that sewage pipelines are arranged in the cities for collecting and uniformly treating the urban sewage and then discharging the urban sewage into the nature.
For preventing the pedestrian from entering by mistake, the urban sewer is provided with the inspection well cover to collect the urban sewage while not interfering normal walking of people, and the urban sewage often contains a large amount of solid such as branches, leaves, plastic bags, and these solids are very easy to block up the income water hole of the inspection well cover, cause the sewage unable in time to discharge to give off the stink and cause the influence to the environment.
Therefore, in view of the above, research and improvement are performed on the existing structure and defects, and an energy-saving and environment-friendly device for preliminary cleaning and anti-clogging of municipal sewage is provided, so as to achieve the purpose of higher practical value.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides an energy-saving and environment-friendly device for automatically and preliminarily cleaning and preventing urban sewage from being blocked, which has the advantages of automatically cleaning and improving the sewage treatment effect when a drain hole of a sewer is blocked, automatically spraying an air purifying agent to prevent sewage in the sewer from emitting stink to influence the life of people, and solves the problems that a traditional inspection well cover cannot effectively clean blocking objects when being blocked and stink in the sewer often emits from the inspection well cover.
(II) technical scheme
In order to realize the purposes of automatically cleaning and improving the sewage treatment effect and automatically spraying an air purifying agent to prevent the sewage in the sewer from emitting foul smell to influence the life of people when a drain hole of the sewer is blocked, the invention provides the following technical scheme: an anti-clogging energy-saving and environment-friendly device for automatically preliminarily cleaning urban sewage comprises a bearing cover, wherein a drain hole is formed in the middle of the bearing cover, the bottom of the bearing cover is movably connected with a connecting rod, the bottom of the connecting rod is movably connected with a transmission rod, the bottom of the transmission rod is movably connected with a return spring, the right side of the transmission rod is movably connected with a rotating wheel, the bottom of the rotating wheel is movably connected with a pull rod, the top of the pull rod is movably connected with a supporting seat, the top of the supporting seat is movably connected with a cleaning spring, the top of the cleaning spring is movably connected with a cleaning seat, the top of the cleaning seat is movably connected with a cleaning rod, the bottom of the pull rod is movably connected with a push rod, the bottom of the push rod is movably connected with a sliding block, the left side of the sliding block is movably connected with a limiting rod, the bottom of the sliding block is movably connected with an extrusion block, the bottom of the extrusion block is movably connected with a deodorizing spring, remove flavor spring bottom swing joint and have the extrusion gasbag, extrusion gasbag right side swing joint has and removes the flavor piece, remove flavor piece right side swing joint and have the extrusion spring, extrusion spring right side swing joint has the stock solution chamber.
Preferably, the transmission rod is a screw rod and is meshed with the rotating wheel, and the central axis of the transmission rod is collinear with the central axis of the connecting rod and the central axis of the return spring.
Preferably, a sliding groove is formed in the limiting rod, and the sliding groove is connected with the sliding block in a sliding mode.
Preferably, the liquid stored in the liquid storage cavity is air freshener, and the central axis of the liquid storage cavity is in the same straight line with the central axes of the smell removing block and the extrusion spring.
Preferably, the central axis of the cleaning seat, the central axis of the supporting seat and the central axis of the cleaning spring are in the same straight line.
Preferably, the sliding block is connected with the extrusion block in a sliding mode, and the contact surface is an inclined surface.
(III) advantageous effects
Compared with the prior art, the invention provides an anti-clogging energy-saving environment-friendly device for preliminary cleaning of urban sewage, which has the following beneficial effects:
1. the anti-clogging energy-saving and environment-friendly device for preliminary cleaning of urban sewage gradually increases the pressure applied to the bearing cover, further, a downward pressure is applied to the reset spring through the connecting rod, and finally the reset spring is compressed to deform so as to drive the transmission rod to move downwards, at the moment, the transmission rod moves to drive the rotating wheel to rotate, the rotating wheel rotates to drive the pull rod to move in the vertical direction, so that the supporting seat is pushed to extrude the cleaning spring and deform the cleaning spring, then an upward thrust is applied to the cleaning seat, the thrust is transmitted to the cleaning rod through the cleaning seat and finally drives the cleaning rod to do reciprocating motion in the vertical direction, the cleaning rod can drag the garbage blocked at the top of the drain hole into the drain hole in the reciprocating motion process, thereby achieving the effect of automatically cleaning and improving the sewage treatment efficiency when the drain hole of the sewer is blocked.
2. The urban sewage self-primary cleaning anti-clogging energy-saving environment-friendly device can drive the push rod to move while rotating through the rotating wheel, the push rod can drive the sliding block to move on the limiting rod, when the sliding block moves towards the direction far away from the water drain hole, a transverse thrust is applied to the extrusion block, so that the extrusion block applies a vertical downward pressure to the odor removal spring, and finally the odor removal spring extrudes the extrusion air bag to increase the internal pressure of the extrusion air bag, thereby leading the extrusion air bag to generate deformation and applying a transverse thrust to the odor removing block, finally compressing the extrusion spring to generate deformation so as to extrude the liquid storage cavity, the air pressure in the liquid storage cavity is increased, the air freshener stored in the liquid storage cavity is sprayed out, thereby achieving the effect of automatically spraying the air purifying agent to prevent the sewage in the sewer from emitting foul smell to influence the life of people.
Drawings
FIG. 1 is a schematic view of a drainage hole according to the present invention;
FIG. 2 is a schematic view of the load bearing cover of the present invention;
FIG. 3 is a schematic view of the structure of the transmission rod of the present invention;
FIG. 4 is a schematic view of the cleaning spring structure of the present invention;
FIG. 5 is a schematic view of the extrusion block of the present invention.
In the figure: 1. a drain hole; 2. a load bearing cover; 3. a connecting rod; 4. a transmission rod; 5. a return spring; 6. a rotating wheel; 7. a pull rod; 8. a push rod; 9. a supporting seat; 10. cleaning the spring; 11. cleaning a seat; 12. cleaning the rod; 13. a slider; 14. a limiting rod; 15. extruding the block; 16. a deodorizing spring; 17. extruding the air bag; 18. a deodorizing block; 19. a compression spring; 20. a liquid storage cavity.
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. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, an energy-saving and environment-friendly device for preliminary cleaning and anti-clogging of municipal sewage comprises a bearing cover 2, a drain hole 1 is arranged in the middle of the bearing cover 2, the bottom of the bearing cover 2 is movably connected with a connecting rod 3, the bottom of the connecting rod 3 is movably connected with a transmission rod 4, the bottom of the transmission rod 4 is movably connected with a return spring 5, the right side of the transmission rod 4 is movably connected with a rotating wheel 6, the transmission rod 4 is a screw rod, the transmission rod 4 is meshed with the rotating wheel 6, the central axis of the transmission rod 4 is collinear with the central axes of the connecting rod 3 and the return spring 5, the bottom of the rotating wheel 6 is movably connected with a pull rod 7, the top of the pull rod 7 is movably connected with a support seat 9, the top of the support seat 9 is movably connected with a cleaning spring 10, the top of the cleaning spring 10 is movably connected with a cleaning seat 11, the central axis of the cleaning seat 11 is collinear with the central axes of the support seat 9 and the cleaning spring 10, the top of the cleaning seat 11 is movably connected with a cleaning rod 12;
pull rod 7 bottom swing joint has push rod 8, push rod 8 bottom swing joint has sliding block 13, sliding block 13 left side swing joint has gag lever post 14, the inside sliding tray that has seted up of gag lever post 14, and this sliding tray and sliding block 13 sliding connection, sliding block 13 bottom swing joint has extrusion piece 15, sliding block 13 and extrusion piece 15 sliding connection, and the contact surface is the inclined plane, extrusion piece 15 bottom swing joint has odor removing spring 16, odor removing spring 16 bottom swing joint has extrusion gasbag 17, extrusion gasbag 17 right side swing joint has odor removing block 18, odor removing block 18 right side swing joint has extrusion spring 19, extrusion spring 19 right side swing joint has stock solution chamber 20, the inside liquid of storage solution chamber 20 storage is the air freshener, and the central axis of stock solution chamber 20 with odor removing block 18, the central axis of extrusion spring 19 is same straight line.
The working principle is as follows: this urban sewage is from preliminary clearance energy-concerving and environment-protective device who prevents blockking up, sewage flows into wash port 1 through bearing lid 2 when normally carrying out the drainage in, finally flow into to the sewer through wash port 1 inside, if take place rubbish and block up wash port 1, because the gathering of sewage, the pressure that bearing lid 2 received at this moment increases gradually, and then apply a decurrent pressure for reset spring 5 through connecting rod 3, and finally compress reset spring 5 and make it produce deformation and drive transfer line 4 downstream, because transfer line 4 is the screw rod and transfer line 4 meshes with runner 6, so transfer line 4 motion can drive runner 6 and rotate during this, runner 6 rotates and can drive pull rod 7 and move in vertical direction, thereby promote supporting seat 9 extrusion clearance spring 10 and make it produce deformation, and then apply an ascending thrust for clearance seat 11, this thrust transmits to clearance pole 12 through clearance seat 11 and finally drives clearance pole 12 and reciprocate the transportation in vertical direction The cleaning rod 12 can drag garbage blocked at the top of the drain hole 1 into the drain hole 1 in the reciprocating motion process, so that the effect of improving the sewage treatment efficiency by automatically cleaning when the drain hole 1 of the sewer is blocked is achieved, and the device realizes the self-cleaning effect through mechanical cooperation and the gravitational potential energy of sewage, so that the device is more energy-saving and environment-friendly.
This urban sewage is from preliminary clearance energy-concerving and environment-protective device of preventing blockking up, can drive push rod 8 motion when the directive wheel 6 rotates, push rod 8 motion can drive sliding block 13 and move on gag lever post 14, because the contact surface of sliding block 13 and extrusion piece 15 is the inclined plane, so can exert a horizontal thrust for extrusion piece 15 and then make extrusion piece 15 exert for removing the vertical decurrent pressure of flavor spring 16 when sliding block 13 moves to the direction of keeping away from wash port 1, and finally extrude gasbag 17 through removing flavor spring 16 extrusion, so that extrude gasbag 17 internal pressure increase, thereby make extrusion gasbag 17 produce this deformation and exert a horizontal thrust to removing flavor piece 18, this thrust finally compress extrusion spring 19 and make it produce deformation and extrude stock solution chamber 20, make the inside atmospheric pressure increase of stock solution chamber 20, make the air freshener of stock solution chamber 20 inside spout, thereby achieving the effect of automatically spraying the air purifying agent to prevent the sewage in the sewer from emitting foul smell to influence the life of people.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The utility model provides an energy-concerving and environment-protective device that municipal sewage prevents blockking up from preliminary clearance, includes bearing cap (2), its characterized in that: a drain hole (1) is formed in the middle of the bearing cover (2), a connecting rod (3) is movably connected to the bottom of the bearing cover (2), a transmission rod (4) is movably connected to the bottom of the connecting rod (3), a reset spring (5) is movably connected to the bottom of the transmission rod (4), a rotating wheel (6) is movably connected to the right side of the transmission rod (4), a pull rod (7) is movably connected to the bottom of the rotating wheel (6), a supporting seat (9) is movably connected to the top of the pull rod (7), a cleaning spring (10) is movably connected to the top of the supporting seat (9), a cleaning seat (11) is movably connected to the top of the cleaning spring (10), a cleaning rod (12) is movably connected to the top of the cleaning seat (11), a push rod (8) is movably connected to the bottom of the pull rod (7), and a sliding block (13) is movably connected to the bottom of the push rod (8), the left side of the sliding block (13) is movably connected with a limiting rod (14), the bottom of the sliding block (13) is movably connected with an extrusion block (15), the bottom of the extrusion block (15) is movably connected with a smell removal spring (16), the bottom of the smell removal spring (16) is movably connected with an extrusion air bag (17), the right side of the extrusion air bag (17) is movably connected with a smell removal block (18), the right side of the smell removal block (18) is movably connected with an extrusion spring (19), and the right side of the extrusion spring (19) is movably connected with a liquid storage cavity (20); the transmission rod (4) is a screw rod, the transmission rod (4) is meshed with the rotating wheel (6), and the central axis of the transmission rod (4) is collinear with the central axes of the connecting rod (3) and the return spring (5); a sliding groove is formed in the limiting rod (14), and the sliding groove is connected with the sliding block (13) in a sliding manner; the liquid stored in the liquid storage cavity (20) is air freshener, and the central axis of the liquid storage cavity (20) is in the same straight line with the central axes of the odor removing block (18) and the extrusion spring (19); the central axis of the cleaning seat (11) is in the same straight line with the central axes of the supporting seat (9) and the cleaning spring (10); the sliding block (13) is in sliding connection with the extrusion block (15), and the contact surface is an inclined surface;
when the drainage is normally carried out, sewage flows into the drainage hole (1) through the bearing cover (2) and finally flows into the sewer through the drainage hole (1), if the drainage hole (1) is blocked by garbage, the pressure borne by the bearing cover (2) is gradually increased due to the accumulation of the sewage, a downward pressure is applied to the reset spring (5) through the connecting rod (3), the reset spring (5) is finally compressed to deform so as to drive the transmission rod (4) to move downwards, the transmission rod (4) is a screw rod, the transmission rod (4) is meshed with the rotating wheel (6), so that the transmission rod (4) moves to drive the rotating wheel (6) to rotate, the rotating wheel (6) rotates to drive the pull rod (7) to move in the vertical direction, the supporting seat (9) is pushed to extrude the cleaning spring (10) and deform, and an upward thrust is further applied to the cleaning seat (11), this thrust transmits clearance pole (12) and finally drives clearance pole (12) and make reciprocating motion in vertical direction through clearance seat (11), and clearance pole (12) can drag the rubbish of jam at wash port (1) top into wash port (1) at reciprocating motion's in-process to automatic clearance when having reached sewer wash port (1) and having improved sewage treatment efficiency's effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011008879.6A CN112095771B (en) | 2020-09-23 | 2020-09-23 | Urban sewage is from preliminary clearance preventing block's energy-concerving and environment-protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011008879.6A CN112095771B (en) | 2020-09-23 | 2020-09-23 | Urban sewage is from preliminary clearance preventing block's energy-concerving and environment-protective device |
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| Publication Number | Publication Date |
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| CN112095771A CN112095771A (en) | 2020-12-18 |
| CN112095771B true CN112095771B (en) | 2021-12-24 |
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| CN202011008879.6A Active CN112095771B (en) | 2020-09-23 | 2020-09-23 | Urban sewage is from preliminary clearance preventing block's energy-concerving and environment-protective device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112709298A (en) * | 2020-12-25 | 2021-04-27 | 贺茂遥 | Indoor sanitary pipeline drainage device that blocks up of energy-concerving and environment-protective |
| CN112930766A (en) * | 2021-02-02 | 2021-06-11 | 张许东 | Desert environmental protection is administered with automatic auxiliary assembly who digs automatic watering of hole kind tree |
| CN112726803A (en) * | 2021-02-04 | 2021-04-30 | 温州兴南环保科技有限公司 | Environmental protection device capable of automatically adjusting sewage in blocking process of drainage of sewage well cover |
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|---|---|---|---|---|
| EP0582542A1 (en) * | 1992-07-24 | 1994-02-09 | Werner Nill | Sieve grid for rain water spillway |
| CN206143903U (en) * | 2016-08-30 | 2017-05-03 | 周卓然 | Sewer is prevented stifledly and is prevented odor returning device |
| CN110284574A (en) * | 2019-07-15 | 2019-09-27 | 宁海艾雅机械设备有限公司 | A kind of Anti-clogging downcomer road |
| CN110512710A (en) * | 2019-09-04 | 2019-11-29 | 长沙凯泽工程设计有限公司 | A kind of sewage pipe processing unit |
| CN110946543A (en) * | 2019-12-10 | 2020-04-03 | 何明来 | Pneumatic self-cleaning device for intelligent household door-entering carpet |
| CN211328319U (en) * | 2019-10-16 | 2020-08-25 | 李拴孩 | Sewage treatment plant's sewage debris isolating construction |
-
2020
- 2020-09-23 CN CN202011008879.6A patent/CN112095771B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0582542A1 (en) * | 1992-07-24 | 1994-02-09 | Werner Nill | Sieve grid for rain water spillway |
| CN206143903U (en) * | 2016-08-30 | 2017-05-03 | 周卓然 | Sewer is prevented stifledly and is prevented odor returning device |
| CN110284574A (en) * | 2019-07-15 | 2019-09-27 | 宁海艾雅机械设备有限公司 | A kind of Anti-clogging downcomer road |
| CN110512710A (en) * | 2019-09-04 | 2019-11-29 | 长沙凯泽工程设计有限公司 | A kind of sewage pipe processing unit |
| CN211328319U (en) * | 2019-10-16 | 2020-08-25 | 李拴孩 | Sewage treatment plant's sewage debris isolating construction |
| CN110946543A (en) * | 2019-12-10 | 2020-04-03 | 何明来 | Pneumatic self-cleaning device for intelligent household door-entering carpet |
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| CN112095771A (en) | 2020-12-18 |
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Effective date of registration: 20211203 Address after: 210000 floor 4, block a, Yuting Plaza, No. 59, Wangqiao Road, Xiongzhou street, Liuhe District, Nanjing, Jiangsu Province, No. 4-54 Applicant after: Nanjing Weida Environmental Protection Technology Co.,Ltd. Address before: 231300 Shengshan 18, Guangming Village, Wuxian Town, Shucheng County, Lu'an City, Anhui Province Applicant before: Chu Chengai |
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Address after: Room 1801-6, Unit 1, Building 4, Hengda Yufu, No. 20 Knitting Street, Xiaodian District, Taiyuan City, Shanxi Province, 030000 Patentee after: Taiyuan Guangyu Washing Chemical Equipment Co.,Ltd. Country or region after: China Address before: 210000 floor 4, block a, Yuting Plaza, No. 59, Wangqiao Road, Xiongzhou street, Liuhe District, Nanjing, Jiangsu Province, No. 4-54 Patentee before: Nanjing Weida Environmental Protection Technology Co.,Ltd. Country or region before: China |
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