CN214685603U - Inner wall grinding device is used in steel pipe production - Google Patents
Inner wall grinding device is used in steel pipe production Download PDFInfo
- Publication number
- CN214685603U CN214685603U CN202120749424.3U CN202120749424U CN214685603U CN 214685603 U CN214685603 U CN 214685603U CN 202120749424 U CN202120749424 U CN 202120749424U CN 214685603 U CN214685603 U CN 214685603U
- Authority
- CN
- China
- Prior art keywords
- sliding
- steel pipe
- seat
- speed reducer
- carriage
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 37
- 239000010959 steel Substances 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 21
- 238000005498 polishing Methods 0.000 claims abstract description 18
- 230000007246 mechanism Effects 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 230000007774 longterm Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Landscapes
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
The utility model relates to the technical field of steel pipe processing, in particular to an inner wall polishing device for steel pipe production, which comprises a fixed frame, a bottom plate and a supporting seat, wherein the supporting seat is rotationally matched with a rotating shaft, one end of the rotating shaft is provided with a first belt wheel, the other end of the rotating shaft is provided with a polishing head, the bottom plate is provided with a motor for driving the first belt wheel through a belt, the bottom plate is provided with a speed reducer, a third belt wheel is rotationally matched with an input shaft on the speed reducer through the belt, the bottom of the sliding frame is rotationally provided with a screw rod, one end of the screw rod is connected with an output shaft of the speed reducer, a nut seat is rotationally arranged on the screw rod, a connecting rod is arranged on the nut seat, and the top of the connecting rod is connected with a movable clamping mechanism. The electric energy loss is high, and economic loss can be brought to factories under the long-term use.
Description
Technical Field
The utility model relates to a steel pipe technical field specifically is an inner wall grinding device is used in steel pipe production.
Background
Steel pipes are not only used for transporting fluids and powdery solids, exchanging heat energy, manufacturing mechanical parts and containers, but also are economical steels.
The existing grinding device generally needs two motors to drive, one driving grinding head and the other driving clamping steel pipe moving mechanism, the defect is that one motor is more than one electric energy loss, certain economic loss can be brought to a steel pipe processing factory due to long accumulation of the problem, the axis of the existing grinding device clamping steel pipe is inconvenient to adjust, and the existing grinding device clamping steel pipe is generally fixed, therefore, one grinding device can only grind the steel pipe with one aperture size, the steel pipes with different aperture sizes cannot be ground, and certain defects exist.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an inner wall grinding device is used in steel pipe production possesses energy-conservingly, and can be according to the advantage in the steel pipe adjustment axle center of different pipe diameters to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: an inner wall polishing device for steel pipe production comprises a sliding frame and a fixed frame arranged on the left side of the sliding frame, wherein the bottom of the fixed frame is provided with a bottom plate, the top of the fixed frame is provided with a top plate, the top plate is provided with a supporting seat, the supporting seat is in rotating fit with a rotating shaft, one end of the rotating shaft extends to the outer side of the supporting seat and is fixedly connected with a first belt wheel, the other end of the rotating shaft extends to the upper side of the sliding frame and is fixedly connected with a polishing head, the bottom plate is fixedly provided with a motor for driving the first belt wheel to rotate through a belt, one end of the bottom plate, which is far away from the motor, is provided with a speed reducer, an input shaft of the speed reducer is sleeved with a second belt wheel, a third belt wheel is fixedly sleeved on the outer side of the rotating shaft and is positioned between the first belt wheel and the polishing head, the third belt wheel on the rotating shaft is in rotating fit with the second belt wheel on the speed reducer through a belt, the bottom of the sliding frame is provided with a lead screw along the length direction, and two ends of the lead screw are sleeved with bearing seats fixedly connected with the sliding frame, one end of the screw rod extends to the outer side of the bearing seat and is connected with an output shaft of the speed reducer through a coupler, a nut seat is matched on the screw rod, a connecting rod is fixedly arranged on the nut seat, and one end, far away from the nut seat, of the connecting rod extends to the top of the sliding seat and is connected with a movable clamping mechanism.
Optionally, fixture is including setting firmly two slide rails in the carriage top both sides, and two slide rail sliding fit have two sliders, the sliding seat has set firmly between two sliders, the draw-in groove has been seted up on the sliding seat, and the inside activity of draw-in groove inlays the lower chuck that is equipped with liftable and adjusts, the adjustment tank that holds the connecting rod is seted up to the bottom of lower chuck, the recess has been seted up at the top of lower chuck, and the inside of recess is equipped with the activity and runs through down the chuck and with the adjusting bolt of connecting rod looks spiro union, the outside of adjusting bolt just is located the one end of adjustment tank inside and has set firmly the top piece, the top surface of top piece and the bottom surface looks butt of lower chuck.
Optionally, the two sliding blocks are symmetrically provided with first fixing rods, a supporting plate is fixedly connected to the top ends of the first fixing rods, a hydraulic cylinder is fixedly arranged on the top surface of the supporting plate, and a piston rod of the hydraulic cylinder movably penetrates through the supporting plate and is fixedly connected with an upper chuck.
Optionally, the two sides of the upper chuck are symmetrically provided with sliding grooves respectively, a second fixing rod is movably embedded in the sliding grooves, the top end of the second fixing rod extends to the upper portion of the upper chuck and is fixedly connected with a limiting ring, and the bottom end of the second fixing rod is fixedly connected with the sliding seat.
Optionally, the mount has set firmly a plurality of footing that are used for the support with the bottom of carriage, and a plurality of footing are rectangular array along the bottom of mount and carriage and distribute.
Compared with the prior art, the utility model provides an inner wall grinding device is used in steel pipe production possesses following beneficial effect:
1. the utility model solves the problems that the polishing device in the prior art generally needs two motors to work, has high electric energy loss and can bring economic loss to a steel pipe processing factory under the long accumulated use by arranging the rotating shaft, the first belt wheel, the second belt wheel, the third belt wheel, the speed reducer, the screw rod, the nut seat, the connecting rod and the movable clamping mechanism;
2. the utility model discloses set up the slide to and set up the draw-in groove that is used for holding down the chuck on the slide, make down chuck accessible adjusting bolt screw thread interlock connecting rod carry out the oscilaltion in the inside of adjustment tank, be convenient for carry out the centre gripping to the steel pipe of equidimension pipe diameter not, make steel pipe and the epaxial coaxial axle of polishing of changeing, be convenient for accomplish subsequent polishing work.
Drawings
Fig. 1 is a schematic overall structure diagram of the present invention;
FIG. 2 is a partial cross-sectional view of FIG. 1;
fig. 3 is a partially enlarged view of a portion a in fig. 2.
In the figure: 1. a carriage; 2. a fixed mount; 3. a clamping mechanism; 301. a slide rail; 302. a slider; 303. a sliding seat; 304. a card slot; 305. a lower chuck; 306. an adjustment groove; 307. a groove; 308. adjusting the bolt; 309. a topsheet; 310. a first fixing lever; 311. a support plate; 312. a hydraulic cylinder; 313. an upper chuck; 314. a chute; 315. a second fixing bar; 316. a limiting ring; 4. a base plate; 5. a top plate; 6. a supporting seat; 7. a rotating shaft; 8. a first pulley; 9. polishing head; 10. a motor; 11. a speed reducer; 12. a second pulley; 13. a third belt pulley; 14. a screw rod; 15. a bearing seat; 16. a nut seat; 17. a connecting rod; 18. and (5) footing.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example (b): referring to fig. 1, an inner wall polishing device for steel pipe production comprises a sliding frame 1 and a fixed frame 2 arranged on the left side of the sliding frame 1, wherein a bottom plate 4 is arranged at the bottom of the fixed frame 2, a top plate 5 is arranged at the top of the fixed frame 2, a supporting seat 6 is arranged on the top plate 5, the supporting seat 6 is in running fit with a rotating shaft 7, one end of the rotating shaft 7 extends to the outer side of the supporting seat 6 and is fixedly connected with a first belt wheel 8, the other end of the rotating shaft 7 extends to the upper side of the sliding frame 1 and is fixedly connected with a polishing head 9, a motor 10 for driving the first belt wheel 8 to rotate through a belt is fixedly arranged on the bottom plate 4, a speed reducer 11 is arranged at one end of the bottom plate 4 far away from the motor 10, a second belt wheel 12 is sleeved on an input shaft of the speed reducer 11, a third belt wheel 13 is fixedly arranged on the outer side of the rotating shaft 7 and is fixedly sleeved between the first belt wheel 8 and the polishing head 9, the third belt wheel 13 on the rotating shaft 7 is in running fit with the second belt wheel 12 on the speed reducer 11 through a belt, a screw rod 14 is arranged at the bottom of the sliding frame 1 along the length direction of the sliding frame, bearing seats 15 fixedly connected with the sliding frame 1 are sleeved at two ends of the screw rod 14, one end of the screw rod 14 extends to the outer side of the bearing seat 15 and is connected with an output shaft of the speed reducer 11 through a coupler, a nut seat 16 is matched on the screw rod 14, a connecting rod 17 is fixedly arranged on the nut seat 16, and one end, far away from the nut seat 16, of the connecting rod 17 extends to the top of the sliding seat 303 and is connected with a movable clamping mechanism 3;
the both ends of supporting seat 6 are equipped with the bearing of cover establishing in the pivot 7 outside, therefore, motor 10 accessible belt drives first band pulley 8 and rotates, thereby pivot 7 drives first band pulley 8 through motor 10 and rotates and drive third band pulley 13 and polish head 9 in proper order and rotate, third band pulley 13 passes through the input shaft of belt normal running fit speed reducer 11, thereby the output shaft accessible shaft coupling of speed reducer 11 drives lead screw 14 and rotates, lead screw 14 is through normal running fit nut seat 16, therefore nut seat 16 accessible connecting rod 17 drives fixture 3 and moves to one side of polish head 9, make motor 10 when the drive polish head 9 is pivoted, can drive the steel pipe on the fixture 3 and move to one side of polish head 9, thereby accomplish polishing of pipeline inner wall.
Referring to fig. 2 to 3, the clamping mechanism 3 includes two slide rails 301 fixed on two sides of the top of the sliding rack 1, the two slide rails 301 are slidably fitted with two sliding blocks 302, a sliding seat 303 is fixed between the two sliding blocks 302, a clamping groove 304 is formed on the sliding seat 303, a lower chuck 305 capable of being adjusted in a lifting manner is movably embedded in the clamping groove 304, an adjusting groove 306 for accommodating the connecting rod 17 is formed at the bottom of the lower chuck 305, a groove 307 is formed at the top of the lower chuck 305, an adjusting bolt 308 movably penetrating through the lower chuck 305 and screwed with the connecting rod 17 is formed in the groove 307, a top plate 309 is fixed at one end of the outer side of the adjusting bolt 308 and located in the adjusting groove 306, the top surface of the top plate 309 abuts against the bottom surface of the lower chuck 305, first fixing rods 310 are symmetrically formed on the two sliding blocks 302, a support plate 311 is fixedly connected to the top end of the first fixing rod 310, and a hydraulic cylinder 312 is fixed to the top surface of the support plate 311, a piston rod of the hydraulic cylinder 312 movably penetrates through the support plate 311 and is fixedly connected with an upper chuck 313, sliding grooves 314 are symmetrically formed in two sides of the upper chuck 313 respectively, a second fixing rod 315 is movably embedded in each sliding groove 314, the top end of each second fixing rod 315 extends to the upper side of the upper chuck 313 and is fixedly connected with a limiting ring 316, the bottom end of each second fixing rod 315 is fixedly connected with the corresponding sliding seat 303, a plurality of bottom feet 18 for supporting are fixedly arranged at the bottom ends of the fixed frame 2 and the sliding frame 1, and the plurality of bottom feet 18 are distributed in a rectangular array along the bottom ends of the fixed frame 2 and the sliding frame 1;
therefore, when the adjusting bolt 308 in the groove 307 is screwed, the adjusting bolt 308 can be engaged with the connecting rod 17 by threads to ascend or descend, when the adjusting bolt 308 ascends, the top plate 309 on the outer side can support the lower chuck 305, so that the lower chuck 305 ascends or descends in the clamping groove 304 on the sliding seat 303, therefore, the lower chuck 305 can adjust the axis according to different pipe diameters of the steel pipe, so as to clamp the steel pipes with different pipe diameters, the upper chuck 313 passes through the second fixing rod 315 movably embedded in the sliding groove 314, so that the hydraulic cylinder 312 can control the upper chuck 313 to slidably cooperate with the second fixing rod 315 to ascend or descend through the piston rod, so as to cooperate with the lower chuck 305 to complete clamping and fixing of the steel pipe.
The working principle is as follows: in the use process of the utility model, a steel pipe to be polished is put on the lower chuck 305, the hydraulic cylinder 312 is started, the hydraulic cylinder 312 pushes the upper chuck 313 to move downwards along the second fixing rod 315 through the piston rod to match with the lower chuck 305 to complete the clamping of the steel pipe, then the motor 10 is started, the belt wheel on the motor 10 can drive the first belt wheel 8 to rotate through the belt, the first belt wheel 8 can drive the rotating shaft 7 to rotate through the rotation, the rotating shaft 7 can drive the polishing head 9 and the third belt wheel 13 to rotate while rotating, the third belt wheel 13 can drive the second belt wheel 12 on the input shaft of the speed reducer 11 to rotate through the belt, the input shaft of the speed reducer 11 can rotate through the rotation of the gear transmission output shaft, the output shaft can drive the screw rod 14 to rotate through the shaft coupling, the screw rod 14 can drive the nut seat 16 to move left and right through the rotation, the nut seat 16 can drive the connecting rod 17 to move through the movement, the connecting rod 17 is connected with the clamping mechanism 3, so that the connecting rod 17 can drive the clamping mechanism 3 to move to one side of the polishing head 9, and the polishing of the inner wall of the steel pipe is finished;
if steel pipes with different diameters need to be ground, the adjusting bolt 308 in the groove 307 is screwed, the adjusting bolt 308 can be meshed with the connecting rod 17 in a threaded manner to ascend or descend in the adjusting groove 306, when the adjusting bolt 308 ascends, the lower chuck 305 can be supported through the top plate 309 on the outer side, so that the lower chuck 305 ascends or descends in the clamping groove 304 on the sliding seat 303 to clamp the steel pipes with different diameters, and the steel pipes and the grinding head 9 on the rotating shaft 7 are coaxial, so that subsequent grinding work is facilitated.
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 an … …" does not exclude the presence of other identical 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 (5)
1. The utility model provides an inner wall grinding device is used in steel pipe production, includes carriage (1) to and locate left mount (2) of carriage (1), its characterized in that: the bottom of mount (2) is equipped with bottom plate (4), and the top of mount (2) is equipped with roof (5), be equipped with supporting seat (6) on roof (5), supporting seat (6) normal running fit has pivot (7), one end on pivot (7) extends to the outside of supporting seat (6) and rigid coupling has first band pulley (8), the other end on pivot (7) extends to the top of carriage (1) and rigid coupling has polishing head (9), it drives first band pulley (8) pivoted motor (10) through the belt to set firmly on bottom plate (4), and the one end of keeping away from motor (10) on bottom plate (4) is equipped with speed reducer (11), the cover is equipped with second band pulley (12) on the input shaft of speed reducer (11), the outside of pivot (7) just is located and fixes the cover between first band pulley (8) and polishing head (9) and is equipped with third band pulley (13), third band pulley (13) on pivot (7) rotates through belt and joins in marriage with second band pulley (12) on speed reducer (11) and join in marriage Close, be equipped with lead screw (14) along its length direction in the bottom of carriage (1), and the both ends cover of lead screw (14) is equipped with bearing frame (15) with carriage (1) looks rigid coupling, one end on lead screw (14) extends to the outside of bearing frame (15) and is connected with the output shaft of speed reducer (11) through the shaft coupling, and the cooperation has nut seat (16) on lead screw (14), connecting rod (17) have set firmly on nut seat (16), the one end of keeping away from nut seat (16) on connecting rod (17) extends to the top of sliding seat (303) and is connected with mobilizable fixture (3).
2. The inner wall grinding device for steel pipe production according to claim 1, wherein: the clamping mechanism (3) comprises two sliding rails (301) fixedly arranged on two sides of the top of the sliding frame (1), the two sliding rails (301) are in sliding fit with the two sliding blocks (302), a sliding seat (303) is fixedly arranged between the two sliding blocks (302), a clamping groove (304) is formed in the sliding seat (303), a lower clamping head (305) capable of being adjusted in a lifting mode is movably embedded in the clamping groove (304), an adjusting groove (306) for accommodating a connecting rod (17) is formed in the bottom of the lower clamping head (305), a groove (307) is formed in the top of the lower clamping head (305), an adjusting bolt (308) which penetrates through the lower clamping head (305) in a movable mode and is in threaded connection with the connecting rod (17) is arranged in the groove (307), a top plate (309) is fixedly arranged on the outer side of the adjusting bolt (308) and located at one end inside the adjusting groove (306), and the top surface of the top plate (309) is abutted to the bottom surface of the lower clamping head (305).
3. The inner wall grinding device for steel pipe production according to claim 2, wherein: the two sliding blocks (302) are respectively symmetrically provided with first fixing rods (310), the top ends of the first fixing rods (310) are fixedly connected with a support plate (311), the top surface of the support plate (311) is fixedly provided with a hydraulic cylinder (312), and a piston rod of the hydraulic cylinder (312) movably penetrates through the support plate (311) and is fixedly connected with an upper chuck (313).
4. The inner wall grinding device for steel pipe production according to claim 3, wherein: the two sides of the upper clamping head (313) are symmetrically provided with sliding grooves (314), a second fixing rod (315) is movably embedded in the sliding grooves (314), the top end of the second fixing rod (315) extends to the upper side of the upper clamping head (313) and is fixedly connected with a limiting ring (316), and the bottom end of the second fixing rod (315) is fixedly connected with the sliding seat (303).
5. The inner wall grinding device for steel pipe production according to claim 1, wherein: the bottom of mount (2) and carriage (1) sets firmly a plurality of footing (18) that are used for supporting, and a plurality of footing (18) are the rectangular array along the bottom of mount (2) and carriage (1) and distribute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120749424.3U CN214685603U (en) | 2021-04-13 | 2021-04-13 | Inner wall grinding device is used in steel pipe production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120749424.3U CN214685603U (en) | 2021-04-13 | 2021-04-13 | Inner wall grinding device is used in steel pipe production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214685603U true CN214685603U (en) | 2021-11-12 |
Family
ID=78531012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120749424.3U Expired - Fee Related CN214685603U (en) | 2021-04-13 | 2021-04-13 | Inner wall grinding device is used in steel pipe production |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214685603U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114083364A (en) * | 2021-12-10 | 2022-02-25 | 合肥陶陶新材料科技有限公司 | Polishing device for special ceramic products |
-
2021
- 2021-04-13 CN CN202120749424.3U patent/CN214685603U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114083364A (en) * | 2021-12-10 | 2022-02-25 | 合肥陶陶新材料科技有限公司 | Polishing device for special ceramic products |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203471499U (en) | Polisher for polishing inner wall and outer wall of pipe | |
| CN106475878B (en) | A kind of full-automatic silicon single crystal rod barreling integrated equipment | |
| CN103072063B (en) | Excircle abrasive belt grinding method of wall thickness of tube | |
| CN201064863Y (en) | Cross axle grinding machine | |
| CN204546219U (en) | Toilet lid sander | |
| CN111590455A (en) | Polishing device in steel pipe | |
| CN111376393A (en) | Single silicon crystal bar cutting and grinding all-in-one machine | |
| CN208005159U (en) | A kind of tubing joint close automatic assembly line | |
| CN114378584B (en) | Cutting device is used in metal pipeline production | |
| CN209408087U (en) | A kind of centerless grinding system | |
| CN214685603U (en) | Inner wall grinding device is used in steel pipe production | |
| CN201009092Y (en) | Machine tool center frame with self-compensation device | |
| CN104890126A (en) | Marble pillar cutter | |
| CN202318596U (en) | Digital control milling and grinding machine tool special for quartz crucible | |
| CN220196530U (en) | Part machining cutting machine tool | |
| CN219767694U (en) | Edge polishing device for sewer line production | |
| CN112846994A (en) | Laser welded pipe production line for pipe machining and production method | |
| CN210818892U (en) | Automobile parts grinding device convenient to angle regulation | |
| CN209681626U (en) | A kind of tuber | |
| CN201366641Y (en) | Woodworking internal circular grinding machine | |
| CN203019191U (en) | Gantry type polishing system | |
| CN203019216U (en) | Gantry type polishing machine support system | |
| CN206230336U (en) | Full-automatic polishing machine | |
| CN213081105U (en) | Polishing mechanical equipment for steel pipe | |
| CN212793993U (en) | Accurate positioner of high-speed linear rail machining center |
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: 20211112 |