CN218573083U - Bag-type dust collector for separating fine particulate matters in flue gas of industrial kiln - Google Patents
Bag-type dust collector for separating fine particulate matters in flue gas of industrial kiln Download PDFInfo
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- CN218573083U CN218573083U CN202222277817.6U CN202222277817U CN218573083U CN 218573083 U CN218573083 U CN 218573083U CN 202222277817 U CN202222277817 U CN 202222277817U CN 218573083 U CN218573083 U CN 218573083U
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- dust removal
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- 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
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The utility model discloses a sack cleaner for separation of fine particulate matters in flue gas of industrial kilns, which belongs to the technical field of separation of fine particulate matters in flue gas, and aims at solving the problem that the fine particulate matters in flue gas are easy to attach to the inner wall of a dust-removing shell when being separated from a dustproof sack, and are difficult to be directly discharged from the bottom of an ash bucket; the utility model discloses a make the spray thrower can spray the water smoke to the inner chamber of dust removal shell with the external water pipe of spray thrower to improved and attached to the effect of cleaing away at dust removal shell inner wall particulate matter, thereby convenient to use person carries out cleaning work to dust removal shell inner wall.
Description
Technical Field
The utility model belongs to the technical field of the separation of the fine particulate matter of flue gas, concretely relates to sack cleaner for the separation of the fine particulate matter of industrial kiln flue gas.
Background
The kiln or furnace is used for firing ceramic articles and sculptures or fusing enamel on the surface of metal articles, the kiln can generate a large amount of smoke fine particles during working, the smoke fine particles need to be separated, and most of the smoke fine particles are separated by adopting a bag-type dust collector.
The prior art discloses a sack cleaner for separation of industrial kiln flue gas fine particles for CN214345092U, it is through utilizing the shower nozzle of giving vent to anger to face dustproof sack jet-propelled, can in time blow down the attached particulate matter on the dustproof sack, make the particulate matter discharge through the ash bucket, thereby improve work efficiency, in the in-process of in-service use, there is the shortcoming, when the fine particle matter of flue gas separates from dustproof sack, easily depend on the inner wall at the dust removal shell, be difficult to directly discharge from the bottom of ash bucket, influence the work of cleaing away of user to the fine particle matter of flue gas, be unfavorable for using.
Therefore, a bag-type dust collector for separating fine particulate matters in flue gas of an industrial kiln is needed, and the problem that the fine particulate matters in flue gas are easy to attach to the inner wall of a dust collection shell and difficult to directly discharge from the bottom of an ash bucket when separated from a dustproof bag in the prior art is solved.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a sack cleaner for separation of fine particulate matter of industrial kiln flue gas to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a sack cleaner for separation of industrial kiln flue gas fine particles thing, includes the dust removal shell, the bottom intercommunication of dust removal shell one side is fixed with the intake pipe, the top intercommunication of dust removal shell opposite side is fixed with the outlet duct, the intermediate position department at dust removal shell top is fixed with the motor, the output of motor is fixed with the connecting axle, the bottom of connecting axle extends to the position department of dust removal shell inner chamber bottom, the fixed cover in bottom of connecting axle outer peripheral face is equipped with the lagging that is the cross setting, the both sides of lagging bottom surface are fixed with the first brush board that is the slope setting, the both ends at lagging top are fixed with the second brush board that is the symmetric distribution, the intermediate position department intercommunication of dust removal shell both sides is fixed with fixed pipe, the inside of fixed pipe is fixed with the spray thrower, the one side that the spray thrower kept away from each other passes the fixed pipe in adjacent position and extends the outside of fixed pipe, the fixed pipe inner wall is located one side of adjacent position spray thrower and is fixed with first valve.
In the scheme, two threaded cylinders are connected to two sides of the top of the dust removal shell in a threaded manner, a motor is fixed to the top of each threaded cylinder, a connecting rod is fixed to the output end of each motor, the bottom of each connecting rod extends to the position of the bottom of the inner cavity of each threaded cylinder at the adjacent position, and a plurality of fan blades are fixed to the bottom of the outer peripheral surface of each connecting rod.
It is worth further saying that a second filter screen is fixed at a position of the inner cavity of the threaded cylinder, which is located at the bottom of the fan blade at the adjacent position, two air inlets which are symmetrically distributed are communicated with the top of the inner cavity of the threaded cylinder, and a first filter screen is fixed inside the air inlets.
It should be further noted that gas pipes are fixedly communicated with the bottom positions of the adjacent position fixing pipes on the two sides of the dust removing shell, and a second valve is fixedly arranged in each gas pipe.
In a preferred embodiment, the surface of the bottom of the first brush plate is attached to the bottom of the inner cavity surface of the dust-removing housing, and the end of the second brush plate away from each other is attached to the inner peripheral surface of the dust-removing housing.
As a preferred embodiment, the bottom of the inner cavity surface of the dust removing shell is arranged in an arc shape, and the two fixed tubes are arranged at opposite positions on two sides of the dust removing shell by taking a central line of the dust removing shell in the vertical direction as a symmetry axis.
Compared with the prior art, the utility model provides a pair of a sack cleaner for separation of industrial kiln flue gas fine particles thing includes following beneficial effect at least:
(1) Through opening the motor, thereby make the lagging be circular motion, thereby drive first brush board and second brush board and be circular motion, thereby cut to pieces with the internal face of dust removal shell and rub, make the flue gas fine particle thing of depending on at the dust removal shell inner wall to separate, make the spray thrower can spray out the water smoke to the inner chamber of dust removal shell through external water pipe with the spray thrower, thereby improved and to the effect of cleaing away of depending on at the dust removal shell inner wall particulate matter, thereby convenient to use person carries out cleaning work to the dust removal shell inner wall, thereby the convenience in use of the device has been improved, thereby the practicality of the device has been improved.
(2) Through opening the motor, thereby make the connecting rod take place to rotate and drive the flabellum and be circular motion, thereby produce certain wind-force and make the bottom that adnexed fine particle thing dropped the dust removal shell inner chamber on the dust removal sack, under screw thread section of thick bamboo and dust removal shell helicitic texture's cooperation, can adjust the interval between screw thread section of thick bamboo and the sack, thereby convenient to use person is according to the interval between actual regulation screw thread section of thick bamboo and the sack, and possess the good clean effect to adnexed fine particle thing on the dust removal sack, thereby the device's practicality has further been improved.
Drawings
Fig. 1 is a schematic perspective view of the overall structure of the present invention;
fig. 2 is a schematic sectional view of a three-dimensional structure in the front view direction of the present invention;
fig. 3 is an enlarged schematic view of the structure at a in fig. 2 according to the present invention;
fig. 4 is an enlarged schematic view of the structure at B in fig. 2 according to the present invention;
fig. 5 is an enlarged schematic view of the structure at C in fig. 2 according to the present invention.
In the figure: 1. a dust removal shell; 2. a motor; 3. an air inlet pipe; 4. an air outlet pipe; 5. a connecting shaft; 6. sheathing; 7. a first brush plate; 8. a second brush plate; 9. fixing the tube; 10. a sprayer; 11. a first valve; 12. a gas delivery pipe; 13. a second valve; 14. a threaded barrel; 15. a motor; 16. an air inlet; 17. a first filter screen; 18. a connecting rod; 19. a fan blade; 20. a second filter.
Detailed Description
The present invention will be further described with reference to the following examples.
In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will combine the drawings of the embodiments of the present invention to clearly and completely describe the technical solution of the embodiments of the present invention, and obviously, the described embodiments are a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative labor are within the scope of the protection of the present invention based on the described embodiments of the present invention.
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. The condition in the embodiment can be further adjusted according to concrete condition the utility model discloses a it is right under the design prerequisite the utility model discloses a simple improvement of method all belongs to the utility model discloses the scope of claiming.
Referring to fig. 1-5, the utility model provides a sack cleaner for separation of fine particulate matters in flue gas of industrial kilns, including dust removal shell 1, the bottom intercommunication of dust removal shell 1 one side is fixed with intake pipe 3, the top intercommunication of dust removal shell 1 opposite side is fixed with outlet duct 4, the intermediate position department at dust removal shell 1 top is fixed with motor 2, the output of motor 2 is fixed with connecting axle 5, the bottom of connecting axle 5 extends to the position department of dust removal shell 1 inner chamber bottom, the fixed cover in bottom of connecting axle 5 outer peripheral face is equipped with the lagging 6 that is the cross setting, the both sides of lagging 6 bottom surface are fixed with the first brush board 7 that is the slope setting, the both ends at lagging 6 top are fixed with the second brush board 8 that is the symmetric distribution, the intermediate position department intercommunication of dust removal shell 1 both sides is fixed with fixed pipe 9, the inside of fixed pipe 9 is fixed with spray thrower 10, the side that spray thrower 10 kept away from each other passes adjacent position fixed pipe 9 and extends the outside of fixed pipe 9, the one side that the inner wall of fixed pipe 9 lies in adjacent position fixed pipe 10 is fixed pipe is fixed with first valve 11, according to the prior art publication is CN 8978, wherein the known technology has not introduced for the dust removal shell of the known technology, the sack has more specific dust removal shell of this scheme, it is widely available technology, the known technology to have not had not been known to be the dust removal shell 78; the first brush plate 7 and the second brush plate 8 circularly move by starting the motor 2, so that the first brush plate and the second brush plate are scraped against the inner wall surface of the dust removing shell 1, fine smoke particles attached to the inner wall of the dust removing shell 1 can be separated, and the sprayer 10 can spray water mist to the inner cavity of the dust removing shell 1 by connecting the sprayer 10 with an external water pipe, so that the cleaning effect is achieved.
Further as shown in fig. 2 and 4, it is worth specifically explaining that two threaded cylinders 14 are connected to two sides of the top of the dust removing housing 1 through threads, a motor 15 is fixed to the top of the threaded cylinder 14, a connecting rod 18 is fixed to an output end of the motor 15, the bottom of the connecting rod 18 extends to a position of the bottom of an inner cavity of the threaded cylinder 14 at an adjacent position, a plurality of fan blades 19 are fixed to the bottom of the outer peripheral surface of the connecting rod 18, the threaded cylinders 14 can extend in the vertical direction by rotating the threaded cylinders 14 through the connection relationship between the threaded cylinders 14 and the dust removing housing 1, and the connecting rod 18 rotates by turning on the motor 15, so that the connecting rods 18 at the adjacent positions are driven to perform circular motion, and certain wind power is generated and discharged from the bottom of the threaded cylinders 14.
Further as shown in fig. 4 and 5, it is worth specifically explaining that a second filter screen 20 is fixed at a position where the inner cavity of the threaded cylinder 14 is located at the bottom of the adjacent position fan blade 19, the top of the inner cavity of the threaded cylinder 14 is communicated with two air inlet holes 16 which are symmetrically distributed, a first filter screen 17 is fixed inside the air inlet holes 16, dust in the inner cavity of the dust removing housing 1 can be prevented from entering the interior of the threaded cylinder 14 through the second filter screen 20, external air in the threaded cylinder 14 can flow into the interior of the threaded cylinder 14 through the air inlet holes 16, and dust in the external air can be prevented from entering the interior of the threaded cylinder 14 from the interior of the adjacent position air inlet holes 16 through the first filter screen 17.
Further as shown in fig. 2 and 3, it is worth specifically explaining that the bottom position department intercommunication that dust removal shell 1 both sides are located adjacent position fixed pipe 9 is fixed with air pipe 12, the inside of air pipe 12 is fixed with second valve 13, through with the external air pump of air pipe 12, thereby make air pipe 12 department can be to the inner chamber air delivery stream of dust removal shell 1 after opening second valve 13, thereby can spray and go out the home range of water smoke through shower 10, thereby further improve the clean effect to depending on at the inner wall particulate matter of dust removal shell 1.
Further, as shown in fig. 2, it is worth specifically explaining that the surface of the bottom of the first brush plate 7 is attached to the bottom of the inner cavity surface of the dust removing shell 1, and the end of the second brush plate 8 away from each other is attached to the inner circumferential surface of the dust removing shell 1, and due to the contact relationship between the first brush plate 7 and the second brush plate 8 and the inner wall of the dust removing shell 1, the first brush plate 7 and the second brush plate 8 can be scraped and rubbed at different positions of the inner wall of the dust removing shell 1 in the moving process, so that the cleaning effect is ensured.
The scheme has the following working processes: in the actual use process, when a user needs to clean fine flue gas particles which are separated from a cloth bag and attached to the inner wall of the dust removal shell 1, the motor 2 is started, so that the connecting shaft 5 rotates, the connecting shaft 5 drives the sleeve plate 6 to rotate, the first brush plate 7 and the second brush plate 8 are driven to do circular motion, the second brush plate 8 can rub the inner circumferential surface of the dust removal shell 1 in the process, the first brush plate 7 can scrape the bottom position of the inner wall of the dust removal shell 1, so that the particles on the inner wall of the dust removal shell 1 can be separated from the inner wall of the dust removal shell 1, the particles can be discharged from the bottom of the dust removal shell 1 under the action of gravity, the sprayer 10 is externally connected with a water pipe for conveying water flow, and the first valve 11 is opened, so that water mist sprayed by the sprayer 10 can move to the position of the inner cavity of the dust removal shell 1, thereby the cleaning effect of the first brush board 7 and the second brush board 8 can be improved under the action of the water mist, the air pump is connected outside the air pipe 12, thereby the air pipe 12 can convey air flow to the inner cavity of the dust removing shell 1 after the second valve 13 is opened, thereby the moving range of the water mist can be sprayed by the sprayer 10, thereby the cleaning effect of the particles attached to the inner wall of the dust removing shell 1 is further improved, when the particles attached to the surface of the cloth bag are required to be removed by wind power, the threaded barrel 14 is rotated, thereby the threaded barrel 14 can generate extension motion along the vertical direction under the matching action of the external thread structure on the peripheral surface and the internal thread structure on the inner wall of the dust removing shell 1, thereby the distance between the threaded barrel and the cloth bag is adjusted, the motor 15 is opened, thereby the connecting rod 18 rotates, thereby the connecting rods 18 at adjacent positions are driven to do circular motion, thereby generating certain wind force and discharging from the bottom of the threaded cylinder 14, and removing the particles attached to the surface of the cloth bag under the blowing of the air flow.
According to the working process, the following steps are carried out: by starting the motor 2, the first brush plate 7 and the second brush plate 8 do circular motion, so that the first brush plate and the second brush plate are scraped against the inner wall surface of the dust removing shell 1, fine particulate matters of smoke attached to the inner wall of the dust removing shell 1 can be separated, the sprayer 10 can spray water mist to the inner cavity of the dust removing shell 1 by connecting the sprayer 10 with an external water pipe, so that the cleaning effect is improved, the cleaning effect on the particulate matters attached to the inner wall of the dust removing shell 1 is improved, convenience in use of a user is improved, the motor 15 is started, the connecting rod 18 rotates to drive the fan blades 19 to do circular motion, certain wind power is generated to enable the fine particulate matters attached to the dust removing cloth bag to fall to the bottom of the inner cavity of the dust removing shell 1, the distance between the threaded cylinder 14 and the cloth bag can be adjusted under the matching effect of the threaded cylinder 14 and the threaded structure of the dust removing shell 1, and the user can adjust the distance between the threaded cylinder 14 and the cloth bag according to the reality, and has a good cleaning effect on the fine particulate matters attached to the dust removing cloth bag.
Further as shown in fig. 2, it is worth specifically explaining that the bottom of the inner cavity surface of the dust removing shell 1 is arc-shaped, the two fixing pipes 9 are arranged at the opposite positions of the two sides of the dust removing shell 1 by taking the center line of the front vertical direction of the dust removing shell 1 as the symmetry axis, and the bottom of the inner cavity of the dust removing shell 1 is arc-shaped, so that the smoke particles can be discharged from the bottom of the dust removing shell 1 conveniently, and the fixing pipes 9 are symmetrically distributed, so that the overlapping of the water mist ranges sprayed by the sprayer 10 can be avoided as much as possible.
To sum up: by starting the motor 2, the first brush plate 7 and the second brush plate 8 do circular motion, so that the first brush plate and the second brush plate are scraped against the inner wall surface of the dust removing shell 1, fine particulate matters of smoke attached to the inner wall of the dust removing shell 1 can be separated, the sprayer 10 can spray water mist to the inner cavity of the dust removing shell 1 by connecting the sprayer 10 with an external water pipe, so that the cleaning effect is improved, the cleaning effect on the particulate matters attached to the inner wall of the dust removing shell 1 is improved, convenience in use of a user is improved, the motor 15 is started, the connecting rod 18 rotates to drive the fan blades 19 to do circular motion, certain wind power is generated to enable the fine particulate matters attached to the dust removing cloth bag to fall to the bottom of the inner cavity of the dust removing shell 1, the distance between the threaded cylinder 14 and the cloth bag can be adjusted under the matching effect of the threaded cylinder 14 and the threaded structure of the dust removing shell 1, and the user can adjust the distance between the threaded cylinder 14 and the cloth bag according to the reality, and has a good cleaning effect on the fine particulate matters attached to the dust removing cloth bag.
The motor 2 and the motor 15 are commercially available, and the motor 2 and the motor 15 are equipped with a power supply, which belongs to the mature technology in the field and is fully disclosed, so the repeated description is not repeated in the specification.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art, and the use of the term "including" or "comprising" in the present application shall mean that the element or item preceding the term covers the element or item listed after the term and its equivalents, but does not exclude other elements or items, and the term "connected" or "connected" is not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect, "upper", "lower", "left", "right", etc. merely indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may be changed accordingly.
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 (6)
1. The utility model provides a sack cleaner for separation of industrial kiln flue gas fine particles thing, includes dust removal shell (1), its characterized in that, the bottom intercommunication of dust removal shell (1) one side is fixed with intake pipe (3), the top intercommunication of dust removal shell (1) opposite side is fixed with outlet duct (4), the intermediate position department at dust removal shell (1) top is fixed with motor (2), the output of motor (2) is fixed with connecting axle (5), the bottom of connecting axle (5) extends to the position department of dust removal shell (1) inner chamber bottom, the fixed cover in bottom of connecting axle (5) outer peripheral face is equipped with sleevelet (6) that are the cross setting, the both sides on sleevelet (6) bottom surface are fixed with first brush board (7) that are the slope and set up, the both ends at sleevelet (6) top are fixed with second brush board (8) that are the symmetric distribution, the intermediate position department intercommunication of dust removal shell (1) both sides is fixed with fixed pipe (9), the inside of fixed pipe (9) is fixed with spray thrower (10), one side that spray thrower (10) kept away from each other is passed fixed position and fixed pipe (9) and is located adjacent position (9) extension first pipe (11) the outside spray thrower (11).
2. The bag-type dust collector for separating fine particulate matters in smoke of industrial kilns as claimed in claim 1, is characterized in that: two threaded cylinders (14) are connected to the two sides of the top of the dust removal shell (1) in a threaded manner, a motor (15) is fixed to the top of each threaded cylinder (14), a connecting rod (18) is fixed to the output end of each motor (15), the bottom of each connecting rod (18) extends to the position of the bottom of the inner cavity of each threaded cylinder (14) at the adjacent position, and a plurality of fan blades (19) are fixed to the bottom of the outer peripheral surface of each connecting rod (18).
3. The bag-type dust collector for separating fine particulate matters in the flue gas of the industrial kiln according to claim 2, is characterized in that: the fan blade air inlet structure is characterized in that a second filter screen (20) is fixed at the position, located at the bottom of the fan blade (19) at the adjacent position, of the inner cavity of the threaded cylinder (14), two air inlet holes (16) which are symmetrically distributed are communicated with the top of the inner cavity of the threaded cylinder (14), and a first filter screen (17) is fixed inside the air inlet holes (16).
4. The bag-type dust collector for separating fine particulate matters in the flue gas of the industrial kiln according to claim 1, is characterized in that: the dust removal shell (1) both sides are located the bottom position intercommunication of adjacent position fixed pipe (9) and are fixed with gas-supply pipe (12), the inside of gas-supply pipe (12) is fixed with second valve (13).
5. The bag-type dust collector for separating fine particulate matters in smoke of industrial kilns as claimed in claim 1, is characterized in that: the surface of the bottom of the first brush plate (7) is attached to the bottom of the inner cavity surface of the dust removing shell (1), and the end, away from each other, of the second brush plate (8) is attached to the inner circumferential surface of the dust removing shell (1).
6. The bag-type dust collector for separating fine particulate matters in smoke of industrial kilns as claimed in claim 1, is characterized in that: the bottom of the inner cavity surface of the dust removing shell (1) is arranged in an arc shape, and the two fixed tubes (9) are arranged at the opposite positions of the two sides of the dust removing shell (1) by taking the central line of the front vertical direction of the dust removing shell (1) as a symmetry axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222277817.6U CN218573083U (en) | 2022-08-29 | 2022-08-29 | Bag-type dust collector for separating fine particulate matters in flue gas of industrial kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222277817.6U CN218573083U (en) | 2022-08-29 | 2022-08-29 | Bag-type dust collector for separating fine particulate matters in flue gas of industrial kiln |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218573083U true CN218573083U (en) | 2023-03-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222277817.6U Active CN218573083U (en) | 2022-08-29 | 2022-08-29 | Bag-type dust collector for separating fine particulate matters in flue gas of industrial kiln |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218573083U (en) |
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2022
- 2022-08-29 CN CN202222277817.6U patent/CN218573083U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230421 Address after: No. 53 Yangjia, Helu Village, Hudai Town, Binhu District, Wuxi City, Jiangsu Province, 214000 Patentee after: Yang Haidong Patentee after: Yao Qinyan Address before: Room C, 10th Floor, Beijing Building, No. 56, Guomao Avenue, Longhua District, Haikou City, Hainan Province, 572000 Patentee before: Liu Xukai |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230625 Address after: 213000 Xueyan Town Industrial Concentration Zone, Wujin District, Changzhou City, Jiangsu Province Patentee after: Jiangsu Dongxing Environmental Protection Equipment Co.,Ltd. Address before: No. 53 Yangjia, Helu Village, Hudai Town, Binhu District, Wuxi City, Jiangsu Province, 214000 Patentee before: Yang Haidong Patentee before: Yao Qinyan |