CN214467043U - Oil pipe trapping devices is pressed in area based on screw thread - Google Patents
Oil pipe trapping devices is pressed in area based on screw thread Download PDFInfo
- Publication number
- CN214467043U CN214467043U CN202120024398.8U CN202120024398U CN214467043U CN 214467043 U CN214467043 U CN 214467043U CN 202120024398 U CN202120024398 U CN 202120024398U CN 214467043 U CN214467043 U CN 214467043U
- Authority
- CN
- China
- Prior art keywords
- leakage
- gear shaft
- flange
- pressing plate
- injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000002347 injection Methods 0.000 claims abstract description 56
- 239000007924 injection Substances 0.000 claims abstract description 56
- 238000003825 pressing Methods 0.000 claims abstract description 50
- 229920001971 elastomer Polymers 0.000 claims abstract description 31
- 230000005540 biological transmission Effects 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 28
- 239000012528 membrane Substances 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims abstract description 11
- 238000007906 compression Methods 0.000 claims abstract description 11
- 238000005192 partition Methods 0.000 claims abstract description 8
- 244000043261 Hevea brasiliensis Species 0.000 claims description 4
- 229920003052 natural elastomer Polymers 0.000 claims description 4
- 229920001194 natural rubber Polymers 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 210000004907 gland Anatomy 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Landscapes
- Pipe Accessories (AREA)
Abstract
The utility model discloses an oil pipe trapping devices is pressed in area based on screw thread. The device comprises a compression bolt, a stop washer, an end cover, a rotary hand wheel, a main rotating rod, a rear pressing plate bolt, a rear pressing plate, a cavity, a push sleeve, a leakage-proof partition plate sleeve, a transmission gear shaft, a push cover, a front pressing plate, a control gear shaft, a flange buckle, a rubber pore membrane and other components, wherein when leakage repairing is carried out, a leakage repairing flange and the rubber pore membrane are wrapped at a leakage point, the rotary hand wheel is rotated, the main transmission rod drives the push sleeve to push the leakage repairing agent in the cavity forwards, the leakage repairing agent is uniformly distributed in the rubber pore membrane, the leakage repairing agent overflows from a small hole of the rubber pore membrane and fully contacts with the leakage point, and then an injection needle on the rubber pore membrane is pulled out to complete leakage repairing; the utility model discloses can carry out emergent mending leak to oil pipe under the middle and low pressure pipeline leakage condition, it is general to have extensive applicability, and the mending leak is efficient, characteristics such as easy operation.
Description
Technical Field
The utility model relates to an area is pressed oil pipe trapping devices under pressure based on screw thread especially relates to an area is pressed oil pipe trapping devices that can resistance to compression and impact resistance under well low pressure oil pipe leaks the condition.
Background
The pipeline leakage not only can cause a large amount of resource waste, but also can cause serious damage to the natural environment, the prior pipeline leakage repairing technology is in a development stage, most leakage repairing devices can be manually repaired after the well is stopped, the pressure is stopped, and the empty pipe is decompressed, for example, the patent publication No. CN211118265U, although the reliability of the leakage repairing device is better, the oil pipe can be repaired after the empty pipe is needed, the application range is small, and the device belongs to a consumption type repairing device, the cost is higher, and the device cannot be reused; the utility model discloses the head adopts screw thread transmission, and stability and good reliability can realize taking pressure oil pipe repair work to carry out at well low pressure oil pipe leakage in-process, can use repeatedly, light easy operation, and low cost. Patent publication No. CN210004022U, the low cost of device, it is light, but not good to the repair effect of well low pressure oil pipe, cause the secondary to leak easily, the utility model discloses possess the triple protection of mending hourglass agent, rubber membrane and flange, speed, the performance and the security of mending the hourglass are good, consequently the utility model discloses can implement the real-time repair to oil pipe under the condition of well low pressure oil pipe leakage to possess good application prospect and effect.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problems that the oil-gas pipeline pressurized leakage repairing tool in the leakage repairing technology on the market is heavy in volume, not easy to operate and low in leakage repairing effect. When the pipeline is subjected to leakage repairing, the pipeline can be completely wrapped to perform the leakage repairing work, the operation of workers is complex when the leakage repairing is performed, and the leakage repairing efficiency is low.
In order to achieve the above object, the utility model provides a following technical scheme: the injection type pressurized oil pipe leakage repairing tool based on the threads comprises a leakage repairing flange fixing module and a plugging agent injection module; the plugging agent injection module comprises a pushing piston rod and an injection cavity based on threads; the pushing piston rod based on the threads comprises a compression bolt, a stop washer, an end cover, a rotating hand wheel, a main rotating rod, a pushing sleeve and other components, wherein the end cover is fixed at the bottom end of the main rotating rod through the compression bolt and the stop washer; the injection cavity structure of the plugging agent injection module comprises a rear pressing plate bolt, a rear pressing plate, a cavity, a transmission gear shaft, a push cover, a cover pressing plate, a knurled screw cover, a push cover compression bolt, a front pressing plate, a control gear shaft, a leakage-proof partition plate sleeve and other parts, wherein the rear pressing plate, the front pressing plate and the cavity are connected through the front pressing plate bolt and the rear pressing plate bolt to form a closed pipe body structure; a hole is formed above the cavity to form a storage bin for filling the leakage repairing agent, a sealing cover above the storage bin is composed of a push cover, a pressing cover plate, a knurled screw cover and a push cover pressing bolt, a push groove of a main transmission rod is arranged in the cavity, a leakage-proof partition plate sleeve is paved in the push groove to prevent the leakage repairing agent from overflowing, a transmission gear shaft meshed and connected with gear teeth on the main transmission rod is arranged below the cavity, and the transmission gear shaft is meshed and connected with a control gear shaft on the front pressing plate; the flange fixing module comprises parts such as an injection needle, a flange buckle, a rubber hole film, a universal double-hole leakage repairing flange and the like, the flange buckle is connected with a control gear shaft on the injection cavity, two ends of the injection needle are respectively connected with an injection needle mounting hole and the rubber hole film on the injection cavity, a flange port on the universal double-hole leakage repairing flange is inserted into a connecting flange port groove above the front pressing plate, and a lower flange port is buckled on a flange buckle on the lower portion of the front pressing plate.
Preferably, the control gear shaft is provided with a flange buckle fixing shaft, gear teeth below the control gear shaft are meshed with the transmission gear shaft, and the transmission gear shaft drives the control gear shaft to rotate so as to cause the flange buckle rotating shaft above the control gear shaft to do vertical lifting motion;
preferably, the leakage repairing agent storage bin is composed of a dilatation space formed by an opening above the cavity, a push cover and other members;
preferably, the injection needle is designed into a shape of a loop intersection of two needle holes, a space is reserved in the middle of the injection needle, the injection needle is detachable, and the injection needle can be separated from the device by pushing and pulling the injector body when the leakage repairing agent is injected;
preferably, the rubber porous membrane is made of natural rubber, a plurality of small holes are formed in the surface of the rubber porous membrane, the rubber porous membrane is filled when the leakage repairing agent is injected, the leakage holes are uniformly wrapped, the injection overflows from the small holes of the rubber porous membrane and fully contacts the leakage holes of the pipeline, and therefore the leakage repairing efficiency is improved;
preferably, the push sleeve is made of natural rubber materials, and an internal thread meshed with the main rotating rod is formed inside the push sleeve;
preferably, the transmission gear shaft is formed by welding a transmission gear and a connecting rod, the front end of the transmission gear shaft is meshed with the main rotating rod, and the rear end of the transmission gear shaft is connected with the control gear shaft;
the technical effects and advantages of the utility model are as follows: when the device is used, an upper flange port is inserted into a connecting flange port groove above a front pressing plate, a lower flange port is buckled on a flange buckle at the lower part of the front pressing plate, the position needing leak repairing on a pressure pipeline is aimed, a hand wheel can be rotated at the moment, a transmission gear shaft drives a control gear shaft to rotate, so that a flange buckle rotating shaft above the control gear shaft is driven to do vertical lifting motion, the opening degree of a flange is adjusted, and the device is suitable for pressure pipelines with different thicknesses.
The rubber porous membrane in the device is made of natural rubber, a plurality of small holes are formed in the surface of the rubber porous membrane, the rubber porous membrane is full when the leakage repairing agent is injected, the leakage holes are uniformly wrapped, the injection overflows from the small holes of the rubber porous membrane and fully contacts the leakage holes of the pipeline, and therefore the leakage repairing efficiency is improved;
the utility model discloses injection cavity's preceding clamp plate top is provided with the recess of flange port, and the below has the flange of adjustable flange state to detain, but the general diplopore mending leakage flange of the various models of carry, is suitable for extensively, the mending leakage cost that has significantly reduced.
The utility model discloses carrying out the pipeline trapping during operation, utilizing the trapping flange, rubber hole membrane and leaking stoppage agent carry out the three-layer trapping to the leak source or the welding seam of pipeline, reinforcing trapping effect, easy operation, and effectual promotion trapping efficiency.
Drawings
Fig. 1 is a schematic view of a cross-sectional structure of a thread-based pressurized oil pipe leakage repairing device provided by the utility model;
FIG. 2 is a schematic view of a thread-based pressurized tubing leak-stopping device;
FIG. 3 is a top view of a thread-based tubing under pressure leak-stopping device;
FIG. 4 is a schematic view of a rotary hand wheel in the thread-based leakage repairing device for an oil pipe under pressure;
FIG. 5 is a schematic view of a flange fastener in the thread-based leakage repairing device for the oil pipe under pressure;
in the figure: 1. a hold-down bolt; 2. a stop washer; 3. an end cap; 4. rotating a hand wheel; 5. a rear platen bolt; 6. a rear pressing plate; 7. a cavity; 8. a main rotating rod; 9. pushing a sleeve; 10. a leakage-proof clapboard sleeve; 11. a drive gear shaft; 12. pushing the cover; 13. pressing the cover plate; 14. knurling and screwing the cover; 15. pushing the cover to compress the bolt; 16. a front platen bolt; 17. a front platen; 18. a control gear shaft; 19. fastening a flange; 20. a rubber porous membrane; 21. a universal double-hole leakage-repairing flange; 22. and (4) injecting a needle.
Detailed Description
In order to make the purpose of the utility model, the technical scheme and advantages more clear, the utility model will be further explained by combining the attached drawings, as shown in fig. 1, the utility model is composed of parts such as 1 hold-down bolt, 2 stop washers, 3 end covers, 4 rotating hand wheels, 8 main rotating rods, 9 push sleeves, 10 leakage-proof partition sleeves, 5 front press plate bolts, 6 rear press plates, 7 cavities, 11 transmission gear shafts, 12 push covers, 13 cover pressing plates, 14 knurled screw covers, 15 push cover hold-down bolts, 16 front press plate bolts, 17 front press plates, 18 control gear shafts, 22 injection needles, 19 flange buckles, 20 rubber hole films, 21 general double-hole leakage-repairing flanges and the like;
FIG. 2 is a schematic diagram of a thread-based pressurized oil pipe leakage repairing device, and FIG. 3 is a top view of the thread-based pressurized oil pipe leakage repairing device, which includes a leakage repairing flange fixing module and a plugging agent injection module;
the plugging agent injection module comprises a pushing piston rod based on threads and an injection cavity; the thread-based push piston rod comprises a compression bolt 1, a stop washer 2, an end cover 3, a rotary hand wheel 4, a main rotating rod 8, a push sleeve 9 and other components, wherein the end cover 3 is fixed at the bottom end of the main rotating rod 8 through the compression bolt 1 and the stop washer 2, the end cover 3 and the rotary hand wheel 4 are both in threaded engagement and fixation with the rear end of the main rotating rod 8, the diameters of the front end and the rear end of the main rotating rod 8 are different, the front end of the main rotating rod 8 is provided with gear teeth engaged with a transmission gear shaft 11, and the surface of the rear end of the main rotating rod 8 is provided with external threads which are engaged and fixed with the internal threads of the push sleeve 9;
the injection cavity structure of the plugging agent injection module comprises a rear pressing plate bolt 5, a rear pressing plate 6, a cavity 7, a transmission gear shaft 11, a push cover 12, a gland plate 13, a knurled screw cover 14, a push cover compression bolt 15, a front pressing plate bolt 16, a front pressing plate 17, a control gear shaft 18, a leakage-proof partition plate sleeve 10 and other parts, wherein the rear pressing plate 6, the front pressing plate 17 and the cavity 7 are connected through the front pressing plate bolt and the rear pressing plate bolt to form a closed pipe body structure, the control gear shaft 18 is connected inside the front pressing plate 17, a groove for connecting a flange port is arranged above the front pressing plate 17, and an injection needle 22 mounting hole is formed in the middle of the groove; a hole is formed above the cavity 7 to form a storage bin for filling a leakage repairing agent, a sealing cover above the storage bin is composed of a push cover 12, a pressing cover sheet 13, a knurled screw cover 14 and a push cover pressing bolt 15, a push groove of the main transmission rod 8 is arranged inside the cavity 7, a leakage-proof partition plate sleeve 10 is paved inside the push groove to prevent the leakage repairing agent from overflowing, a transmission gear shaft 11 meshed and connected with gear teeth on the main transmission rod 8 is arranged below the cavity 7, and the transmission gear shaft 11 is meshed and connected with a control gear shaft 18 on a front pressing plate 17;
fig. 5 is a schematic view of a flange fastener in the leakage repairing device for the oil pipe under pressure based on the thread, the flange fixing module comprises an injection needle 22, a flange fastener 19, a rubber hole film 20, a universal double-hole leakage repairing flange 21 and other parts, the flange fastener 19 is connected with a control gear shaft 18 on an injection cavity, two ends of the injection needle 22 are respectively connected with an injection needle mounting hole and the rubber hole film 20 on the injection cavity, an upper flange port of the universal double-hole leakage repairing flange 21 is inserted into a connecting flange port groove above a front pressing plate 17, and a lower flange port is fastened on the flange fastener at the lower part of the front pressing plate 17.
The specific operation steps are as follows:
1. an upper universal double-hole leakage-repairing flange 21 is additionally arranged in a groove of a connecting flange port above a front pressure plate 17 of the device;
2. connecting an injection needle 22 of the device with an insertion hole of the rubber porous membrane 20, and inserting the other end of the injection needle 22 into an injection needle mounting hole in the middle of a front pressing plate 17 of the device after the injection needle is fixed;
3. installing a lower universal double-hole leakage repairing flange 21 on a flange buckle 19, and rotating a rotating hand wheel 4 anticlockwise to open the lower part to a maximum angle, so that the flange can be accurately fixed on a pipeline conveniently;
4. opening a push cover 12 in an injection bin of the device, adding a proper amount of plugging agent, and screwing down the push cover 12 after the filling is finished;
5. covering a rubber hole film 20 on a leakage point, clockwise rotating a rotating hand wheel 4 to adjust a flange to be a closed state to sleeve a pipeline, and additionally arranging a fixing bolt fixing flange at the other end of the flange;
6. the hand wheel 4 is rotated clockwise to push the main transmission rod 8 forward, so that the leakage repairing agent in the injection cavity is injected into the rubber hole film 20, the leakage holes are uniformly wrapped by the hole film, and the injection overflows from the small holes of the rubber hole film 20 and fully contacts the leakage holes of the pipeline;
7. rotating the rotating hand wheel 4 anticlockwise to separate the lower flange from the flange buckle 19 and pulling out an injection needle 22 connected with the rubber hole film 20;
8. and (4) pulling out the port of the upper leakage repairing flange, and installing the flange fixing bolt at the end to finish leakage repairing work.
The utility model discloses a can carry out emergent mending-leakage to oil pipe under the combined action of each component under the well low pressure pipeline leakage condition, the mending-leakage is efficient, and easy operation has extensive suitability.
Claims (4)
1. The utility model provides a take pressure oil pipe trapping devices based on screw thread which characterized in that: the device comprises a leakage repairing flange fixing module and a leakage plugging agent injection module; the plugging agent injection module comprises a pushing piston rod and an injection cavity based on threads; the pushing piston rod based on the threads consists of components such as a compression bolt (1), a stop washer (2), an end cover (3), a rotating hand wheel (4), a main rotating rod (8) and a pushing sleeve (9), wherein the end cover (3) is fixed at the bottom end of the main rotating rod (8) through the compression bolt (1) and the stop washer (2), the end cover (3) and the rotating hand wheel (4) are both meshed and fixed with the rear end of the main rotating rod through threads, the front end and the rear end of the main rotating rod (8) are different in diameter, gear teeth meshed with a transmission gear shaft (11) are arranged at the front end of the main rotating rod (8), and external threads are arranged on the surface of the rear end of the main rotating rod (8) and meshed with internal threads of the pushing sleeve (9); the injection cavity structure of the plugging agent injection module comprises parts of a rear pressing plate bolt (5), a rear pressing plate (6), a cavity (7), a transmission gear shaft (11), a push cover (12), a gland plate (13), a knurled screw cover (14), a push cover compression bolt (15), a front pressing plate bolt (16), a front pressing plate (17), a control gear shaft (18) and a leakage-proof partition plate sleeve (10), wherein the rear pressing plate (6), the front pressing plate (17) and the cavity (7) are connected through the front pressing plate bolt (16) and the rear pressing plate bolt (5) to form a closed pipe body structure; a pushing groove of the main rotating rod (8) is formed in the cavity (7), a leakage-proof partition plate sleeve (10) is paved in the pushing groove to prevent leakage repairing agents from overflowing, a transmission gear shaft (11) meshed and connected with gear teeth on the main rotating rod is arranged below the cavity (7), and the rear end of the transmission gear shaft (11) is meshed and connected with a control gear shaft (18) on the front pressing plate (17); a groove for connecting a flange port is arranged above the front pressure plate (17), and an injection needle head (22) mounting hole is arranged in the middle; a hole is formed above the cavity (7) to form a storage bin for filling a leak repairing agent, and a sealing cover above the storage bin is composed of a push cover (12), a pressing cover sheet (13), a knurled screw cover (14) and a push cover pressing bolt (15); the flange fixing module comprises an injection needle (22), a flange buckle (19), a rubber hole film (20) and a universal double-hole leakage repairing flange (21) part, the flange buckle (19) is connected with a control gear shaft (18) on an injection cavity, two ends of the injection needle (22) are respectively connected with an injection needle mounting hole and the rubber hole film (20) on the injection cavity, an upper flange port of the universal double-hole leakage repairing flange (21) is inserted into a connecting flange port groove above a front pressing plate (17), and a lower flange port is buckled on the flange buckle (19) at the lower part of the front pressing plate (17).
2. The thread-based pressurized oil pipe leakage repairing device according to claim 1, characterized in that: the control gear shaft (18) is provided with a flange buckle fixing shaft, gear teeth below the control gear shaft (18) are meshed with the transmission gear shaft (11), and the transmission gear shaft (11) drives the control gear shaft (18) to rotate so as to cause the flange buckle (19) above the control gear shaft to do vertical lifting movement.
3. The thread-based pressurized oil pipe leakage repairing device according to claim 1, characterized in that: the injection needle (22) is designed into a shape of a square intersection of two needle holes, a space is reserved in the middle of the injection needle, the injection needle is detachable, and the needle can be separated from the device by pushing and pulling the injector body after the injection of the leakage repairing agent is finished.
4. The thread-based pressurized oil pipe leakage repairing device according to claim 1, characterized in that: the rubber hole membrane (20) comprise natural rubber, the surface is provided with a plurality of small holes, the rubber hole membrane (20) is full when the leakage repairing agent is injected, the leakage holes are uniformly wrapped, the injection overflows from the small holes of the rubber hole membrane (20), and the injection can fully contact the leakage holes of the pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120024398.8U CN214467043U (en) | 2021-01-06 | 2021-01-06 | Oil pipe trapping devices is pressed in area based on screw thread |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120024398.8U CN214467043U (en) | 2021-01-06 | 2021-01-06 | Oil pipe trapping devices is pressed in area based on screw thread |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214467043U true CN214467043U (en) | 2021-10-22 |
Family
ID=78138486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120024398.8U Expired - Fee Related CN214467043U (en) | 2021-01-06 | 2021-01-06 | Oil pipe trapping devices is pressed in area based on screw thread |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214467043U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709885A (en) * | 2021-01-06 | 2021-04-27 | 西南石油大学 | Oil pipe trapping devices is pressed in area based on screw thread |
| CN112709885B (en) * | 2021-01-06 | 2024-05-17 | 西南石油大学 | Threaded-based leakage repairing device for pressure oil pipe |
-
2021
- 2021-01-06 CN CN202120024398.8U patent/CN214467043U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112709885A (en) * | 2021-01-06 | 2021-04-27 | 西南石油大学 | Oil pipe trapping devices is pressed in area based on screw thread |
| CN112709885B (en) * | 2021-01-06 | 2024-05-17 | 西南石油大学 | Threaded-based leakage repairing device for pressure oil pipe |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN208442419U (en) | A kind of ferrule-type compression joint | |
| CN214467043U (en) | Oil pipe trapping devices is pressed in area based on screw thread | |
| CN207034453U (en) | A kind of Water supplying tube joint | |
| CN112709885A (en) | Oil pipe trapping devices is pressed in area based on screw thread | |
| CN112709885B (en) | Threaded-based leakage repairing device for pressure oil pipe | |
| CN212986422U (en) | Pipeline is salvageed and is used hydraulic pressure plugging device for gas management | |
| CN217540099U (en) | Glue injection plugging device for high-pressure pipeline | |
| CN216046029U (en) | Rocker arm water delivery device of water taking pump ship | |
| CN203558386U (en) | Adjustable rear door sealing device of compression dustbin | |
| CN212921889U (en) | Plugging device suitable for leakage of liquid cargo pump flange of small LNG transport ship | |
| CN212273413U (en) | Municipal administration pipeline rainwater recycle pipeline plugging device | |
| CN202246022U (en) | Combined liquid draining seat | |
| CN205938334U (en) | Valve leakage prosthetic devices | |
| CN212407969U (en) | Expansion plug type pipeline leakage point plugging device | |
| CN212338587U (en) | Pipeline leakage non-pressure-reduction plugging device | |
| CN203271153U (en) | Portable steel bar embedding grout injector | |
| EP1918085A4 (en) | Method of injecting liquid solution resin into tire tube, and injection device, and tire tube filling elastic resin composition | |
| CN209918211U (en) | Tool for injecting glue between interlayers through hole | |
| CN219240166U (en) | Practical soft roadbed grouting pipe | |
| CN2589790Y (en) | Emergency leakage stopping joint for pipeline | |
| CN220169135U (en) | Butter filling mechanism | |
| CN204983726U (en) | Reinforcing bar hinders low pressure irrigator of rust agent | |
| CN105214895B (en) | A kind of low-pressure injection method of reinforcing steel bar corrosion inhibitor | |
| CN220366081U (en) | Diffusion pump sealing assembly | |
| CN204656843U (en) | Generator end lid sealant hydraulic pressure glue filling device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20211022 |