CN209703678U - A kind of consolidation pipeline inside dredger - Google Patents
A kind of consolidation pipeline inside dredger Download PDFInfo
- Publication number
- CN209703678U CN209703678U CN201920050931.0U CN201920050931U CN209703678U CN 209703678 U CN209703678 U CN 209703678U CN 201920050931 U CN201920050931 U CN 201920050931U CN 209703678 U CN209703678 U CN 209703678U
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- drill bit
- consolidation
- driving
- pipeline
- pipe
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Abstract
The utility model provides a kind of consolidation pipeline inside dredger, is related to municipal construction field.Dredger inside the consolidation pipeline, including dredging rotary head, the inside of the Dredge drill bit is hollow, the one end of the Dredge drill bit is provided with barrier clearing device, the other end of the Dredge drill bit is connected with high-voltage driving device, mixture adsorbent equipment is provided on the high-voltage driving device, the barrier clearing device includes taper high-pressure nozzle, gun slot and double wedge of removing obstacles.Dredger inside the consolidation pipeline, Dredge drill bit cooperates the use of taper high-pressure nozzle the silt that consolidated inside blow-off line can be carried out to water impact and bores dynamic clean operation by double wedge of removing obstacles during rotation, the dirt of drying and consolidating in urban sewage pipeline effectively can be subjected to cleaning purge operation, urban sewage pipeline is efficiently solved because of the case where blocking of dirt causes urban waterlogging generation, the device carries out purge operation without being manually entered in drainage pipeline, effectively saves manpower.
Description
Technical field
The utility model relates to municipal construction field, dredger inside specially a kind of consolidation pipeline.
Background technique
Urban sewage pipeline is generally embedded in earth's surface in the following, blow-off line is the component part of overall city planning.City
Drainage system is usually made of drainage pipeline and sewage treatment plant.In the case where carrying out sewage, rainwater separate system, sewage is by arranging
Waterpipe is collected, and is sent to sewage treatment, is discharged into water body or recycling；After rainfall runoff is collected by drainage pipeline, arrange nearby
Enter water body.
Urban sewage pipeline mainly conveys the rainwater and sanitary sewage in city, and rainwater is flowed to from urban surface and drained
The some house refuses of a part of silt (polybag, hair and leaf) can be carried when inside pipeline to enter in blow-off line, In
Accumulate over a long period with blow-off line it is internally dry in the case where can occur the generation of the case where silt consolidation, silt and life inside pipeline
The mixture of rubbish living is fixedly arranged at the blocking that pipeline is easily caused in drainage pipeline, and since rubbish is blended in dry and hard silt
In be easy the gravity flow dredging for being unfavorable for pipeline that penetrates of barrier water, and it is more troublesome during clearing up silt, easily make
Occur at the case where urban waterlogging.
Summary of the invention
(1) the technical issues of solving
In view of the deficiencies of the prior art, the utility model provides a kind of consolidation pipeline inside dredger, solves mud
Sand is fixedly arranged at the blocking that pipeline is easily caused in drainage pipeline, and since soil dry and hard inside pipeline is not easy humidifying, right
Silt problem more troublesome during clearing up.
(2) technical solution
In order to achieve the above object, the utility model is achieved by the following technical programs: a kind of consolidation pipeline inside is thin
Exchange device, including Dredge drill bit, the inside of the Dredge drill bit be it is hollow, the one end of the Dredge drill bit is provided with dress of removing obstacles
It sets, the other end of the Dredge drill bit is connected with high-voltage driving device, and mixture absorption is provided on the high-voltage driving device
Device.
The barrier clearing device includes taper high-pressure nozzle, gun slot and double wedge of removing obstacles, one end center of the Dredge drill bit
Place is embedded with taper high-pressure nozzle, and the gun slot is provided at the right center of taper high-pressure nozzle, and the gun slot runs through
To the left side of taper high-pressure nozzle, the end of the Dredge drill bit is simultaneously embedded positioned at the outside of high-pressure nozzle with double wedge of removing obstacles, institute
The one end of double wedge 203 far from Dredge drill bit 1 of removing obstacles is stated to be embedded with refuse breaking tooth 204.
Preferably, the material of the double wedge of removing obstacles is wolfram steel material, and there are six the quantity of the double wedge of removing obstacles, and six are removed obstacles
Double wedge is arranged radially using high-pressure nozzle as central axes are equidistant.
Preferably, the high-voltage driving device includes socket bearing one, driving storehouse, discharge outlet, socket bearing two, the company of driving
Adapter tube, driving turbine, high-pressure spray gun, lance tube and water-supply-pipe, the other end and socket one fixing sleeve of bearing of the Dredge drill bit
It connecing, outer ring and the fixation of driving storehouse of the socket bearing one are arranged, and it is described to be drivingly connected at the axis that pipe is located inside driving storehouse,
The one end for being drivingly connected pipe is connected to through Dredge drill bit and with Dredge drill bit, the other end for being drivingly connected pipe and drive
Dynamic turbine is fixedly attached, and the inner ring wall of the driving turbine is simultaneously located at the right side for being drivingly connected pipe and socket two fixing sleeve of bearing
Connect, it is described socket bearing two inner ring water-supply-pipe fixation is arranged, it is described driving storehouse inner wall and be located at driving turbine right side with
High-pressure spray gun is welded and fixed, and the input terminal of the high-pressure spray gun is threadedly coupled with lance tube.
Preferably, the shape in the driving storehouse is in tubular.
Preferably, the mixture adsorbent equipment include fixed column, horn-like adsorption tube, connecting tube, screw shackle and
Hose is connected, the water-supply-pipe runs through driving storehouse far from one end of socket bearing two and extends to the outside in driving storehouse, the loudspeaker
Shape adsorption tube is located at the right side in driving storehouse, and the inner wall of the horn-like adsorption tube is welded and fixed with fixed column, the fixed column
One end far from horn-like adsorption tube is fixedly connected with water-supply-pipe, the horn-like adsorption tube one end and connection far from driving storehouse
Pipe is welded and fixed, and the outer surface of the connecting tube offers thread groove, at the inner ring screw thread of the screw shackle and connecting tube
The thread groove that outer surface opens up is threadedly coupled, and the right side of the screw shackle is fixedly connected with hose is connect.
Preferably, the horn-like adsorption tube is equipped with opening close to the end in driving storehouse, and the horn-like adsorption tube is opened
It is 6 centimetres at a distance from driving storehouse at mouthful.
Preferably, the shape that the gun slot opens up is tapered.
(3) beneficial effect
The utility model provides a kind of consolidation pipeline inside dredger.Have it is following the utility model has the advantages that
1, dredger inside the consolidation pipeline, six double wedges of removing obstacles being arranged radially by Dredge drill bit end are removed obstacles
The material of double wedge is wolfram steel material, and Dredge drill bit cooperates the use of taper high-pressure nozzle can by double wedge of removing obstacles during rotation
The silt consolidated inside blow-off line is subjected to water impact and bores dynamic clean operation, it can effectively will be dry in urban sewage pipeline
The dirt of consolidation carries out cleaning purge operation, efficiently solves urban sewage pipeline because the blocking of dirt causes urban waterlogging
It happens, which carries out purge operation without being manually entered in drainage pipeline, effectively saves manpower.
2, dredger inside the consolidation pipeline, by the high-pressure spray gun of driving storehouse inner wall setting, lance tube exports high pressure
The exit that water can go out high-pressure spray gun is sprayed, and the water jets under high pressure that high-pressure spray gun sprays can push driving turbine to be rotated,
The rotation of driving turbine can provide power for Dredge drill bit, effectively convenient to drive to Dredge drill bit, and high-pressure spray gun is defeated
Water flow out flows out from discharge outlet can further moisten the dirt consolidated inside drainage pipeline, promote dredging efficiency.
3, dredger inside the consolidation pipeline, the horn-like adsorption tube being arranged by driving storehouse right side, and horn-like suction
The distance between the opening of attached pipe and driving storehouse for centimetre, horn-like adsorption tube is connected to the connecting hose, by that will connect
The connection of hose and negative-pressure adsorption instrument the solidliquid mixture in drainage pipeline can be entered by horn-like adsorption tube connect it is soft
It in pipe and is discharged, the dirt in drainage pipeline can be discharged, effectively facilitate dirt in drainage pipeline and be discharged, the row of solving
The case where waterpipe blocks again.
Detailed description of the invention
Fig. 1 is the utility model structure sectional view；
Fig. 2 is the utility model structure sectional view；
Fig. 3 is the utility model structure diagram；
Fig. 4 is the utility model structure diagram；
Fig. 5 is cross-sectional view at A-A in the utility model structure chart 4；
Fig. 6 is cross-sectional view at B-B in the utility model structure chart 4；
Fig. 7 is that the utility model is removed obstacles double wedge structural schematic diagram.
Wherein, 1 Dredge drill bit, 2 barrier clearing devices, 201 taper high-pressure nozzles, 202 gun slots, 203 are removed obstacles double wedge, 204 rubbish
Rubbish crushing teeth, 3 high-voltage driving devices, 301 socket bearings one, 302 drive storehouse, 303 discharge outlet, 304 socket bearings two, 305 to drive
Dynamic connecting tube, 306 driving turbines, 307 high-pressure spray guns, 308 lance tubes, 309 water-supply-pipes, 4 mixture adsorbent equipments, 401 are fixed
Column, 402 horn-like adsorption tubes, 403 connecting tubes, 404 screw shackles, 405 connection hoses.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and examples.
The utility model embodiment provides a kind of consolidation pipeline inside dredger, as shown in figs. 1-7, including Dredge drill bit
1, the inside of Dredge drill bit 1 be it is hollow, the one end of Dredge drill bit 1 is provided with barrier clearing device 2, and the other end of Dredge drill bit 1 connects
It is connected to high-voltage driving device 3, mixture adsorbent equipment 4 is provided on high-voltage driving device 3.
Barrier clearing device 2 includes taper high-pressure nozzle 201, gun slot 202 and double wedge 203 of removing obstacles, in one end of Dredge drill bit 1
It is embedded at the heart with taper high-pressure nozzle 201, gun slot 202 is provided at the right center of taper high-pressure nozzle 201, gun slot
202 are through to the left side of taper high-pressure nozzle 201, and the shape that gun slot 202 opens up is tapered, the end and position of Dredge drill bit 1
It is embedded in the outside of high-pressure nozzle 201 with double wedge 203 of removing obstacles, double wedge 203 of removing obstacles one end and refuse breaking far from Dredge drill bit 1
Tooth 204 is embedded, and the material of refuse breaking tooth 204 is wolfram steel material, and refuse breaking tooth 204 is opened far from the side for double wedge 203 of removing obstacles
Equipped with crushing cutter head, house refuse can be cut the silt being convenient for into strips by pipeline by crushing cutter head and house refuse is dredged
Logical, the material for double wedge 203 of removing obstacles is wolfram steel material, and the shape of Dredge drill bit 1 is cylindrical, and the quantity for double wedge 203 of removing obstacles has six
A, six double wedges 203 of removing obstacles, which are that central axes are equidistant with high-pressure nozzle 201, to be arranged radially, and passes through 1 end of Dredge drill bit radial direction
Six be arranged remove obstacles double wedge 203, and the material for double wedge 203 of removing obstacles is wolfram steel material, and Dredge drill bit 1 is during rotation by clear
Hindering double wedge 203 cooperates the use of taper high-pressure nozzle 201 silt that consolidated inside blow-off line can be carried out water impact and brill
Dynamic clean operation, effectively can carry out cleaning purge operation for the dirt of drying and consolidating in urban sewage pipeline, efficiently solve city
City's blow-off line because of the case where blocking of dirt causes urban waterlogging generation, the device without be manually entered in drainage pipeline into
Row purge operation, effectively saves manpower.
High-voltage driving device 3 includes socket bearing 1, driving storehouse 302, discharge outlet 303, socket bearing 2 304, driving
Connecting tube 305, driving turbine 306, high-pressure spray gun 307, lance tube 308 and water-supply-pipe 309, the other end and set of Dredge drill bit 1
Joint bearing 1 is fixedly attached, and the outer ring and the fixation of driving storehouse 302 for being socketed bearing 1 are arranged, and the shape in driving storehouse 302 is in
Tubular is drivingly connected at the axis that pipe 305 is located inside driving storehouse 302, and the one end for being drivingly connected pipe 305 runs through dredging drill
It first 1 and is connected to Dredge drill bit 1, the other end and driving turbine 306 for being drivingly connected pipe 305 are fixedly attached, and drive turbine 306
Inner ring wall is simultaneously fixedly attached positioned at the right side and socket bearing 2 304 for being drivingly connected pipe 305, and the inner ring for being socketed bearing 2 304 is defeated
The fixation of water pipe 309 is arranged, and drives the inner wall in storehouse 302 and the right side for being located at driving turbine 306 is welded and fixed with high-pressure spray gun 307,
The water spray of high-pressure spray gun 307 impact driving driving turbine 306 when on the blade for driving turbine 306 is driven counterclockwise, drives turbine
306 rotation can drive Dredge drill bit 1 to rotate, and the input terminal of high-pressure spray gun 307 is threadedly coupled with lance tube 308, pass through driving
The high-pressure spray gun 307 of 302 inner wall of storehouse setting, the exit that the output high pressure water of lance tube 308 can go out high-pressure spray gun 307 are sprayed
Out, the water jets under high pressure that high-pressure spray gun 307 sprays can push driving turbine 306 to be rotated, and the rotation of driving turbine 306 can be thin
Logical drill bit 1 provides power, effectively convenient to drive to Dredge drill bit 1, and the water flow that exports of high-pressure spray gun 307 is from draining
Outflow can further moisten the dirt consolidated inside drainage pipeline at mouth 303, promoted and dredge efficiency.
Mixture adsorbent equipment 4 includes fixed column 401, horn-like adsorption tube 402, connecting tube 403, screw shackle 404
With connection hose 405, the one end of water-supply-pipe 309 far from socket bearing 2 304 is through driving storehouse 302 and extends to driving storehouse 302
Outside, horn-like adsorption tube 402 is located at the right side in driving storehouse 302, and the inner wall of horn-like adsorption tube 402 and fixed column 401 are welded
Fixation is connect, fixed column 401 is fixedly connected far from one end of horn-like adsorption tube 402 with water-supply-pipe 309, horn-like adsorption tube 402
It is equipped with opening close to the end in driving storehouse 302, the opening of horn-like adsorption tube 402 is 6 centimetres at a distance from driving storehouse 302,
Horn-like adsorption tube 402 is welded and fixed far from the one end in driving storehouse 302 with connecting tube 403, and the outer surface of connecting tube 403 opens up
There is thread groove 413, connects at the inner ring screw thread of screw shackle 404 with 413 screw thread of thread groove that 403 outer surface of connecting tube opens up
It connects, the right side of screw shackle 404 is fixedly connected with hose 405 is connect, and connection hose 405 is canvas filler rubber hose, passes through drive
The horn-like adsorption tube 402 being arranged on the right side of dynamic storehouse 302, and between the opening of horn-like adsorption tube 402 and driving storehouse 302
Distance is 6 centimetres, horn-like adsorption tube 402 is connected to hose 405 is connect, by that will connect hose 405 and negative-pressure adsorption device
Solidliquid mixture in drainage pipeline can be entered in connection hose 405 and be discharged by horn-like adsorption tube 402 by tool connection,
Dirt in drainage pipeline can be discharged, effectively facilitate dirt in drainage pipeline and be discharged, solve drainage pipeline again
The case where blocking, occurs.
Working principle: in use, being connected through a screw thread ring 404 and the company on horn-like adsorption tube 402 for hose 405 is connected
Adapter tube 403 connects, and connection hose 405, water-supply-pipe 309 and lance tube 308 can lengthen connection, by will be inside the consolidation pipeline
Dredger is transported to the position of drain line blockage, while water-supply-pipe 309 and lance tube 308 are carried out high pressure water flowing operation,
High pressure water inside water-supply-pipe 309, which carries out spraying from high-pressure nozzle, to carry out impact dredging for blocking dirt, in lance tube 308
The high pressure water flow in portion is sprayed by high-pressure spray gun 307 and driving turbine 306 is driven to be rotated, and the rotation of driving turbine 306 can
Dredge drill bit 1 is driven to be rotated, six be arranged radially by 1 end of Dredge drill bit remove obstacles double wedge 203, double wedge 203 of removing obstacles
Material be wolfram steel material, Dredge drill bit 1 cooperates taper high-pressure nozzle 201 to make by double wedge 203 of removing obstacles during rotation
It, can effectively will be in urban sewage pipeline with the silt consolidated inside blow-off line can be carried out to water impact and bore dynamic clean operation
The dirt of drying and consolidating carries out cleaning purge operation, by driving the horn-like adsorption tube 402 being arranged on the right side of storehouse 302, and loudspeaker
The distance between the opening of shape adsorption tube 402 and driving storehouse 302 are 6 centimetres, by horn-like adsorption tube 402 with connect hose
405 connections, are connected to negative-pressure adsorption instrument by that will connect hose 405 and the solidliquid mixture in drainage pipeline can be passed through loudspeaker
Shape adsorption tube 402 is entered in connection hose 405 and is discharged, and the dirt in drainage pipeline can be discharged.
The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above.Current row
The technical staff of industry is described in above embodiments and description it should be appreciated that the present utility model is not limited to the above embodiments
Only illustrate the principles of the present invention, on the premise of not departing from the spirit and scope of the utility model, the utility model is also
It will have various changes and improvements, these various changes and improvements fall within the scope of the claimed invention.The utility model
Claimed range is defined by the appending claims and its equivalent thereof.
Claims (7)
1. dredger inside a kind of consolidation pipeline, including Dredge drill bit (1), it is characterised in that: the Dredge drill bit (1) it is interior
Portion be it is hollow, the one end of the Dredge drill bit (1) is provided with barrier clearing device (2), the connection of the other end of the Dredge drill bit (1)
Have high-voltage driving device (3), is provided with mixture adsorbent equipment (4) on the high-voltage driving device (3)；
The barrier clearing device (2) includes taper high-pressure nozzle (201), gun slot (202) and double wedge of removing obstacles (203), the dredging
It is embedded at one end center of drill bit (1) with taper high-pressure nozzle (201), the gun slot (202) is provided with taper high-pressure nozzle
(201) at right center, the gun slot (202) is through to the left side of taper high-pressure nozzle (201), the Dredge drill bit
(1) the end and outside for being located at high-pressure nozzle (201) is embedded with double wedge of removing obstacles (203), the double wedge of removing obstacles (203) is far from thin
The one end of logical drill bit (1) is embedded with refuse breaking tooth (204).
2. dredger inside a kind of consolidation pipeline according to claim 1, it is characterised in that: the double wedge of removing obstacles
(203) material is wolfram steel material, and there are six the quantity of the double wedge of removing obstacles (203), and six double wedges of removing obstacles (203) are with high pressure spray
Head (201), which is that central axes are equidistant, to be arranged radially.
3. dredger inside a kind of consolidation pipeline according to claim 1, it is characterised in that: the high-voltage driving device
(3) include socket bearing one (301), driving storehouse (302), discharge outlet (303), socket bearing two (304), be drivingly connected pipe
(305), turbine (306), high-pressure spray gun (307), lance tube (308) and water-supply-pipe (309) are driven, the Dredge drill bit (1)
The other end is fixedly attached with socket bearing one (301), the outer ring of socket bearing one (301) and driving storehouse (302) fixing sleeve
If the pipe (305) that is drivingly connected is located at the internal axis of driving storehouse (302), the one end for being drivingly connected pipe (305)
It is connected to through Dredge drill bit (1) and with Dredge drill bit (1), the other end for being drivingly connected pipe (305) and driving turbine (306)
It is fixedly attached, the inner ring wall of driving turbine (306) is simultaneously located at the right side for being drivingly connected pipe (305) and socket bearing two
(304) it is fixedly attached, inner ring water-supply-pipe (309) fixation of socket bearing two (304) is arranged, driving storehouse (302)
Inner wall is simultaneously welded and fixed positioned at the right side of driving turbine (306) with high-pressure spray gun (307), the input of the high-pressure spray gun (307)
End is threadedly coupled with lance tube (308).
4. dredger inside a kind of consolidation pipeline according to claim 3, it is characterised in that: the driving storehouse (302)
Shape be in tubular.
5. dredger inside a kind of consolidation pipeline according to claim 3, it is characterised in that: the mixture absorption dress
Setting (4) includes fixed column (401), horn-like adsorption tube (402), connecting tube (403), screw shackle (404) and connection hose
(405), the one end of the water-supply-pipe (309) far from socket bearing two (304) through driving storehouse (302) and extends to driving storehouse
(302) outside, the horn-like adsorption tube (402) are located at the right side of driving storehouse (302), the horn-like adsorption tube (402)
Inner wall be welded and fixed with fixed column (401), the fixed column (401) far from horn-like adsorption tube (402) one end and water delivery
Pipe (309) is fixedly connected, and one end and connecting tube (403) welding far from driving storehouse (302) of the horn-like adsorption tube (402) are solid
Fixed, the outer surface of the connecting tube (403) offers thread groove (413), at the inner ring screw thread of the screw shackle (404) with
Thread groove (413) that connecting tube (403) outer surface opens up is threadedly coupled, the right side of the screw shackle (404) with connect it is soft
Pipe (405) is fixedly connected.
6. dredger inside a kind of consolidation pipeline according to claim 5, it is characterised in that: the horn-like adsorption tube
(402) opening, the opening and driving storehouse (302) of the horn-like adsorption tube (402) are equipped with close to the end of driving storehouse (302)
Distance be 6 centimetres.
7. dredger inside a kind of consolidation pipeline according to claim 1, it is characterised in that: the gun slot (202)
The shape opened up is tapered.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920050931.0U CN209703678U (en) | 2019-01-11 | 2019-01-11 | A kind of consolidation pipeline inside dredger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920050931.0U CN209703678U (en) | 2019-01-11 | 2019-01-11 | A kind of consolidation pipeline inside dredger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209703678U true CN209703678U (en) | 2019-11-29 |
Family
ID=68639472
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920050931.0U Expired - Fee Related CN209703678U (en) | 2019-01-11 | 2019-01-11 | A kind of consolidation pipeline inside dredger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209703678U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537714A (en) * | 2019-01-11 | 2019-03-29 | 杭州余杭弘创物业有限公司 | A kind of consolidation pipeline inside dredger |
| CN114482252A (en) * | 2020-10-26 | 2022-05-13 | 长安大学 | An environmentally friendly high-speed rail tunnel drainage blind pipe dredging device |
| CN114775778A (en) * | 2022-05-09 | 2022-07-22 | 王黎佳 | Municipal works pipeline filth cleaning device |
| CN115405272A (en) * | 2022-04-27 | 2022-11-29 | 普斐特油气工程(江苏)股份有限公司 | Oil gas well head intelligence bubble row system with automatic mediation function easy to overhaul |
-
2019
- 2019-01-11 CN CN201920050931.0U patent/CN209703678U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109537714A (en) * | 2019-01-11 | 2019-03-29 | 杭州余杭弘创物业有限公司 | A kind of consolidation pipeline inside dredger |
| CN114482252A (en) * | 2020-10-26 | 2022-05-13 | 长安大学 | An environmentally friendly high-speed rail tunnel drainage blind pipe dredging device |
| CN115405272A (en) * | 2022-04-27 | 2022-11-29 | 普斐特油气工程(江苏)股份有限公司 | Oil gas well head intelligence bubble row system with automatic mediation function easy to overhaul |
| CN115405272B (en) * | 2022-04-27 | 2023-11-10 | 普斐特油气工程(江苏)股份有限公司 | Oil gas well head intelligence bubble row system with automatic mediation function easy access |
| CN114775778A (en) * | 2022-05-09 | 2022-07-22 | 王黎佳 | Municipal works pipeline filth cleaning device |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191129 Termination date: 20210111 |
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| CF01 | Termination of patent right due to non-payment of annual fee |