CN214125877U - Multi-tooth plough for agricultural machinery - Google Patents
Multi-tooth plough for agricultural machinery Download PDFInfo
- Publication number
- CN214125877U CN214125877U CN202120079694.8U CN202120079694U CN214125877U CN 214125877 U CN214125877 U CN 214125877U CN 202120079694 U CN202120079694 U CN 202120079694U CN 214125877 U CN214125877 U CN 214125877U
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- 230000005540 biological transmission Effects 0.000 claims abstract description 89
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 230000033001 locomotion Effects 0.000 abstract description 14
- 230000003028 elevating effect Effects 0.000 abstract description 4
- 230000008859 change Effects 0.000 description 8
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 4
- 235000017491 Bambusa tulda Nutrition 0.000 description 4
- 241001330002 Bambuseae Species 0.000 description 4
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 4
- 239000011425 bamboo Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The utility model relates to the technical field of agricultural machinery, and a multi-tooth plough for agricultural machinery is disclosed, including support and mount, fixed surface is connected with connecting block, slide rail, dead lever, baffle, stopper and supporting shoe on the support, fixed surface is connected with the coulter under the mount, the support upper surface rotates and is connected with first pivot and second pivot, it has the carriage release lever to peg graft in support upper surface left side. This multi-tooth plough for agricultural machine, through setting up first transmission shaft, transmission groove and spring, make the second transfer line can make things convenient for stable drive locking axle right movement or left movement, can make things convenient for effectually fix and remove fixedly to carriage release lever and support, the carriage release lever can make things convenient for effectually to keep fixed with the support after driving rectangular plate and gyro wheel and carrying out the elevating movement to can comparatively effectually avoid the coulter to take place frictional phenomenon with ground in the transportation, improved the life of coulter greatly.
Description
Technical Field
The utility model relates to the technical field of agricultural machinery, in particular to a multi-tooth plough for agricultural machinery.
Background
A plow is an agricultural implement for tilling land, which is usually mounted on a group of livestock or motor vehicles towing it for breaking up clods of soil and tilling out grooves in order to prepare for sowing, is made of all-steel, is more durable than historically used pig iron plows, and plows out different grooves using different plows according to different environments and different crop needs during working; in the prior art, the coulter can rub against the ground in the transportation process, so that the coulter is abraded, and the service life of the coulter is shortened.
For example, chinese patent publication No. CN211352994U discloses a multi-tooth plow for agricultural machinery, which is provided with a roller for facilitating movement of the device, and a threaded rotating handle for adjusting the height of the roller according to actual needs, so that a coulter can be far away from the ground during movement, thereby preventing the coulter from becoming dull due to friction with the ground, a fixing clamp is fixedly connected with a plow standard through a bolt, different coulters can be replaced according to needs, and different plow blades can be used for plowing different grooves; when in actual use, the fixing clamp is fixedly connected with the plow standard through the bolt, so that time and labor are wasted when the coulter is replaced, the coulter cannot be replaced quickly, and the efficiency of ploughing is reduced.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model provides a to the not enough of prior art, the utility model provides a multi-tooth plough for agricultural machine has solved the problem that proposes in the above-mentioned background art.
(II) technical scheme
In order to achieve the above object, the utility model provides a following technical scheme: a multi-tooth plough for agricultural machinery comprises a bracket and a fixing frame, wherein the upper surface of the bracket is fixedly connected with a connecting block, a slide rail, a fixing rod, a baffle, a limiting block and a supporting block, the lower surface of the fixing frame is fixedly connected with a plough coulter, the upper surface of the bracket is rotatably connected with a first rotating shaft and a second rotating shaft, the left side of the upper surface of the bracket is spliced with a moving rod, the lower surface of the moving rod is fixedly connected with a rectangular plate, the lower surface of the rectangular plate is rotatably connected with a roller, the outer surface of the first rotating shaft is spliced with an operating rod and a first transmission rod, the upper surface of the first transmission rod is spliced with a first transmission shaft, the right side of the limiting block is spliced with a locking shaft, the left side of the locking shaft is fixedly connected with a second transmission rod, the upper surface of the second transmission rod is provided with a transmission groove, the baffle and the second transmission rod are connected through spring transmission, the outer surface of the slide rail is sleeved with a slide block, the slider upper surface fixedly connected with transmission piece and second transmission shaft, the dead lever surface has cup jointed the removal section of thick bamboo, it has the third transmission shaft to peg graft at removal section of thick bamboo surface top, the supporting shoe medial surface has been pegged graft and has been had the third pivot, worm wheel and worm have been cup jointed respectively to second pivot surface and third pivot surface, worm and worm wheel meshing, second pivot surface top fixedly connected with head rod, the head rod upper surface is pegged graft and is had the connecting axle, the connecting axle surface has cup jointed the second connecting rod, the second connecting rod lower surface is pegged graft with the second transmission shaft surface, the positive fixedly connected with carousel of third pivot.
Preferably, the bottom of the outer surface of the second rotating shaft is fixedly connected with a rectangular block, and a structure formed by the second rotating shaft and the rectangular block is inserted into the upper surface of the worm wheel.
Preferably, circular card holes are opened on the right side of the moving rod, the number of the circular card holes is thirty groups, the inner diameter of each circular card hole is larger than the diameter of the locking shaft, and the diameter of the locking shaft is eleven millimeters.
Preferably, the front surface of the transmission block is provided with a circular sliding groove matched with the third transmission shaft, the width of the circular sliding groove is twelve millimeters, and the diameter of the third transmission shaft is eleven millimeters.
Preferably, the bottom of the outer surface of the second transmission shaft is sleeved with a circular truncated cone, the inner diameter of the upper surface of the circular truncated cone is equal to the diameter of the second transmission shaft, and the lower surface of the circular truncated cone is welded to the right side of the upper surface of the sliding block.
Preferably, the control rod is made of stainless steel, a circular non-slip mat is sleeved on the left side of the outer surface of the control rod, and well-shaped non-slip grains are arranged on the outer surface of the circular non-slip mat.
(III) advantageous effects
Compared with the prior art, the utility model provides a multi-tooth plough for agricultural machine possesses following beneficial effect:
1. this multi-tooth plough for agricultural machine, through setting up first transmission shaft, transmission groove and spring, make the second transfer line can make things convenient for stable drive locking axle right movement or left movement, can make things convenient for effectually fix and remove fixedly to carriage release lever and support, the carriage release lever can make things convenient for effectually to keep fixed with the support after driving rectangular plate and gyro wheel and carrying out the elevating movement to can comparatively effectually avoid the coulter to take place frictional phenomenon with ground in the transportation, improved the life of coulter greatly.
2. This multi-tooth plough for agricultural machine through setting up transmission piece and second transmission shaft, the removal section of thick bamboo of both sides can be convenient stable simultaneously carry out elevating movement around making, and then make the mount can be convenient stable with leg joint and separation, and then can comparatively swift change the coulter to can make things convenient for the effectual slot that plows out the different degree of depth with ground, not only improve the efficiency of ploughing greatly, also improve the practicality of coulter greatly.
3. This multi-tooth plough for agricultural machine through setting up worm, connecting axle and second connecting rod, makes the second transmission shaft can stabilize effectual drive slider and transmission piece and remove along the orbit of slide rail, and then can make things convenient for effectually to carry out the dismouting to the multiunit mount to change the multiunit coulter when can be comparatively convenient and stable, operate comparatively convenient and fast, saved the change time of coulter, and then improved the efficiency of ploughing greatly.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1 according to the present invention;
FIG. 3 is a schematic view of the fixing structure of the present invention;
FIG. 4 is a schematic view of a part of the structure of the present invention;
fig. 5 is an enlarged schematic view of the structure at B in fig. 4 according to the present invention.
In the figure: 1. a support; 2. connecting blocks; 3. a slide rail; 4. fixing the rod; 5. a baffle plate; 6. a limiting block; 7. a fixed mount; 8. a coulter; 9. a first rotating shaft; 10. a second rotating shaft; 11. a travel bar; 12. a rectangular plate; 13. a roller; 14. a joystick; 15. a first drive lever; 16. a first drive shaft; 17. a locking shaft; 18. a second transmission rod; 19. a transmission groove; 20. a spring; 21. a slider; 22. a transmission block; 23. moving the drum; 24. a third drive shaft; 25. a second drive shaft; 26. a support block; 27. a third rotating shaft; 28. a worm gear; 29. a worm; 30. a first connecting rod; 31. a connecting shaft; 32. a second connecting rod; 33. a turntable.
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.
Referring to fig. 1-5, the present invention provides a technical solution: a multi-tooth plough for agricultural machinery comprises a bracket 1 and a fixed frame 7, wherein the upper surface of the bracket 1 is fixedly connected with a connecting block 2, a slide rail 3, a fixed rod 4, a baffle 5, a limiting block 6 and a supporting block 26, the lower surface of the fixed frame 7 is fixedly connected with a plough coulter 8, the upper surface of the bracket 1 is rotatably connected with a first rotating shaft 9 and a second rotating shaft 10, the left side of the upper surface of the bracket 1 is inserted with a moving rod 11, the lower surface of the moving rod 11 is fixedly connected with a rectangular plate 12, the lower surface of the rectangular plate 12 is rotatably connected with a roller 13, the outer surface of the first rotating shaft 9 is inserted with an operating rod 14 and a first transmission rod 15, the upper surface of the first transmission rod 15 is inserted with a first transmission shaft 16, the right side of the limiting block 6 is inserted with a locking shaft 17, the left side of the locking shaft 17 is fixedly connected with a second transmission rod 18, the upper surface of the second transmission rod 18 is provided with a transmission groove 19, the baffle 5 is in transmission connection with the second transmission rod 18 through a spring 20, through the arrangement of the first transmission shaft 16, the transmission groove 19 and the spring 20, the second transmission shaft 18 can conveniently and stably drive the locking shaft 17 to move rightwards or leftwards, the movable rod 11 and the bracket 1 can be conveniently and effectively fixed and released, the movable rod 11 can conveniently and effectively keep fixed with the bracket 1 after driving the rectangular plate 12 and the roller 13 to do lifting motion, so that the phenomenon that the coulter 8 rubs with the ground in the transportation process can be effectively avoided, the service life of the coulter 8 is greatly prolonged, the outer surface of the slide rail 3 is sleeved with the slide block 21, the upper surface of the slide block 21 is fixedly connected with the transmission block 22 and the second transmission shaft 25, the outer surface of the fixed rod 4 is sleeved with the movable cylinder 23, the top of the outer surface of the movable cylinder 23 is inserted with the third transmission shaft 24, through the arrangement of the transmission block 22 and the second transmission shaft 25, the movable cylinders 23 on the front side and the rear side can conveniently and stably perform lifting motion simultaneously, so that the fixing frame 7 can be conveniently and stably connected with and separated from the bracket 1, and the coulter 8 can be rapidly replaced, thereby conveniently and effectively ploughing grooves with different depths on the ground, not only greatly improving the efficiency of ploughing, but also greatly improving the practicability of the coulter 8, a third rotating shaft 27 is inserted in the inner side surface of the supporting block 26, a worm wheel 28 and a worm 29 are respectively sleeved on the outer surface of the second rotating shaft 10 and the outer surface of the third rotating shaft 27, the worm 29 is meshed with the worm wheel 28, a first connecting rod 30 is fixedly connected to the top of the outer surface of the second rotating shaft 10, a connecting shaft 31 is inserted on the upper surface of the first connecting rod 30, a second connecting rod 32 is sleeved on the outer surface of the connecting shaft 31, the lower surface of the second connecting rod 32 is inserted with the outer surface of the second transmission shaft 25, and the second transmission shaft 25 can stably and effectively drive the sliding block 21 and the transmission block 22 to move along the track of the sliding rail 3 by arranging the worm 29, the connecting shaft 31 and the second connecting rod 32, and then can make things convenient for effectual dismouting to multiunit mount 7 to can change multiunit coulter 8 when comparatively convenient and stable, operate comparatively convenient and fast, save the change time of coulter 8, and then improved the efficiency of ploughing greatly, the positive fixedly connected with carousel 33 of third pivot 27.
The utility model discloses in, in order to make the drive second pivot 10 that worm wheel 28 can be stable rotate, consequently at second pivot 10 surface bottom fixedly connected with rectangular block, and the structure that second pivot 10 and rectangular block become pegs graft with worm wheel 28 upper surface, the rectangular block has improved the stability of worm wheel 28 with the linkage of second pivot 10.
The utility model discloses in, fix carriage release lever 11 and support 1 for making locking axle 17 can be convenient, consequently seted up circular calorie of hole at carriage release lever 11 right side, and the quantity in circular calorie of hole is thirty groups, and the internal diameter in circular calorie of hole is greater than the diameter of locking axle 17, and the diameter of locking axle 17 is eleven millimeters, and circular calorie of hole has improved the convenience that locking axle 17 fixed carriage release lever 11 and support 1.
The utility model discloses in, in order to make the 24 motion of drive third transmission shaft that transmission piece 22 can be convenient, consequently openly offer at transmission piece 22 with the circular spout of 24 looks adaptations of third transmission shaft, and the width of circular spout is twelve millimeters, and the diameter of third transmission shaft 24 is eleven millimeters, circular spout has improved the convenience of transmission piece 22 with the linkage of third transmission shaft 24.
The utility model discloses in, in order to make the drive slider 21 motion that second transmission shaft 25 can be stable, consequently cup jointed the round platform bottom second transmission shaft 25 surface, and round platform upper surface internal diameter equals with second transmission shaft 25 diameter, and the welding of round platform lower surface and slider 21 upper surface right side, the welding has improved the stability that second transmission shaft 25 and round platform and slider 21 are connected.
The utility model discloses in, in order to make the first pivot 9 of drive that control rod 14 can be stable rotate, consequently set up the material of control rod 14 and be the stainless steel, and control rod 14 surface left side has cup jointed ring shape slipmat, and ring shape slipmat surface is provided with well shape anti-skidding line, and well shape antiskid line has increased the frictional force between palm and the control rod 14, has improved the stability of controlling control rod 14.
When the device is used, firstly, the support 1 is connected with a motor vehicle through the connecting block 2, then the inner wall of the top of the fixed frame 7 is contacted with the upper surface of the movable cylinder 23, then the rotating disc 33 is rotated anticlockwise, the rotating disc 33 drives the third rotating shaft 27 and the worm 29 to rotate anticlockwise, the worm 29 is meshed with the worm wheel 28 for transmission, the worm wheel 28 drives the second rotating shaft 10 and the first connecting rod 30 to rotate clockwise, the first connecting rod 30 drives the connecting shaft 31 and the second connecting rod 32 to move, the lower surface of the second connecting rod 32 is inserted with the outer surface of the second transmission shaft 25, further the second transmission shaft 25 drives the sliding block 21 and the transmission block 22 to move towards the right side along the track of the sliding rail 3, the front surface of the transmission block 22 is provided with a circular sliding groove matched with the third transmission shaft 24, further the third transmission shaft 24 drives the movable cylinder 23 and the fixed frame 7 to move upwards relative to the fixed rod 4, the fixed frame 7 moves upwards, and after the inner wall of the bottom of the fixed frame 7 is tightly connected with the lower surface of the support 1, stopping rotating the rotating disc 33, holding the operating lever 14, driving the first rotating shaft 9 and the first driving lever 15 to rotate clockwise by the operating lever 14, driving the first driving shaft 16 to rotate clockwise by the first driving lever 15, matching the first driving shaft 16 with the driving groove 19, enabling the second driving lever 18 to drive the locking shaft 17 to move leftward, separating the locking shaft 17 from a circle center clamping hole formed in the right side surface of the moving lever 11, driving the roller 13 and the moving lever 11 to move upward by the rectangular plate 12, loosening the operating lever 14 after the roller 13 is twenty centimeters away from the ground, enabling the second driving lever 18 to drive the locking shaft 17 to move rightward under the elastic action of the spring 20, enabling the locking shaft 17 to be matched with a circular clamping hole formed in the right side surface of the moving lever 11, enabling the moving lever 11 and the roller 13 to be fixed relative to the bracket 1, and finally driving the bracket 1 and the coulter 8 to plough the ground through a motor car.
In conclusion, the multi-tooth plough for agricultural machinery has the advantages that the first transmission shaft 16, the transmission groove 19 and the spring 20 are arranged, so that the second transmission shaft 18 can conveniently and stably drive the locking shaft 17 to move rightwards or leftwards, the movable rod 11 and the support 1 can be conveniently and effectively fixed and released, the movable rod 11 can conveniently and effectively keep fixed with the support 1 after driving the rectangular plate 12 and the roller 13 to move up and down, the phenomenon that the plough coulter 8 is rubbed with the ground in the transportation process can be effectively avoided, and the service life of the plough coulter 8 is greatly prolonged.
This multi-tooth plough for agricultural machine through setting up transmission piece 22 and second transmission shaft 25, the removal section of thick bamboo 23 of both sides can be convenient stable carry out elevating movement simultaneously around making, and then make that mount 7 can be convenient stable be connected and the separation with support 1, and then can be comparatively swift change coulter 8 to can make things convenient for the effectual slot that plows out the different degree of depth with ground, not only improve the efficiency of ploughing greatly, also improve coulter 8's practicality greatly.
This multi-tooth plough for agricultural machine, through setting up worm 29, connecting axle 31 and second connecting rod 32, make second transmission shaft 25 can stabilize effectual drive slider 21 and transmission piece 22 and remove along slide rail 3's orbit, and then can make things convenient for effectually carry out the dismouting to multiunit mount 7 to change multiunit coulter 8 when can be comparatively convenient and stable, it is comparatively convenient and fast to operate, has saved the change time of coulter 8, and then has improved the efficiency of ploughing greatly.
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 multi-tooth plough for agricultural machine, includes support (1) and mount (7), its characterized in that: the upper surface of the bracket (1) is fixedly connected with a connecting block (2), a sliding rail (3), a fixing rod (4), a baffle (5), a limiting block (6) and a supporting block (26), the lower surface of the fixing frame (7) is fixedly connected with a coulter (8), the upper surface of the bracket (1) is rotatably connected with a first rotating shaft (9) and a second rotating shaft (10), the left side of the upper surface of the bracket (1) is spliced with a moving rod (11), the lower surface of the moving rod (11) is fixedly connected with a rectangular plate (12), the lower surface of the rectangular plate (12) is rotatably connected with a roller (13), the outer surface of the first rotating shaft (9) is spliced with an operating rod (14) and a first transmission rod (15), the upper surface of the first transmission rod (15) is spliced with a first transmission shaft (16), the right side of the limiting block (6) is spliced with a locking shaft (17), the left side surface of the locking shaft (17) is fixedly connected with a second transmission rod (18), the upper surface of the second transmission rod (18) is provided with a transmission groove (19), the baffle (5) and the second transmission rod (18) are in transmission connection through a spring (20), the outer surface of the sliding rail (3) is sleeved with a sliding block (21), the upper surface of the sliding block (21) is fixedly connected with a transmission block (22) and a second transmission shaft (25), the outer surface of the fixed rod (4) is sleeved with a movable cylinder (23), the top of the outer surface of the movable cylinder (23) is inserted with a third transmission shaft (24), the inner side surface of the supporting block (26) is inserted with a third rotating shaft (27), the outer surface of the second rotating shaft (10) and the outer surface of the third rotating shaft (27) are respectively sleeved with a worm wheel (28) and a worm (29), the worm (29) is meshed with the worm wheel (28), the top of the outer surface of the second rotating shaft (10) is fixedly connected with a first connecting rod (30), and the upper surface of the first connecting rod (30) is inserted with a connecting shaft (31), the outer surface of the connecting shaft (31) is sleeved with a second connecting rod (32), the lower surface of the second connecting rod (32) is connected with the outer surface of the second transmission shaft (25) in an inserting mode, and the front face of the third rotating shaft (27) is fixedly connected with a rotating disc (33).
2. A multi-tooth plow for agricultural machinery as defined in claim 1, wherein: the bottom of the outer surface of the second rotating shaft (10) is fixedly connected with a rectangular block, and a structure formed by the second rotating shaft (10) and the rectangular block is inserted into the upper surface of the worm wheel (28).
3. A multi-tooth plow for agricultural machinery as defined in claim 1, wherein: circular card hole has been seted up to carriage release lever (11) right side face, and the quantity in circular card hole is thirty groups, and the internal diameter in circular card hole is greater than the diameter of locking axle (17), and the diameter of locking axle (17) is eleven millimeters.
4. A multi-tooth plow for agricultural machinery as defined in claim 1, wherein: the front surface of the transmission block (22) is provided with a circular sliding groove matched with the third transmission shaft (24), the width of the circular sliding groove is twelve millimeters, and the diameter of the third transmission shaft (24) is eleven millimeters.
5. A multi-tooth plow for agricultural machinery as defined in claim 1, wherein: the bottom of the outer surface of the second transmission shaft (25) is sleeved with a circular truncated cone, the inner diameter of the upper surface of the circular truncated cone is equal to the diameter of the second transmission shaft (25), and the lower surface of the circular truncated cone is welded with the right side of the upper surface of the sliding block (21).
6. A multi-tooth plow for agricultural machinery as defined in claim 1, wherein: the material of control rod (14) is the stainless steel, and control rod (14) surface left side has cup jointed ring shape slipmat, and the annular slipmat surface of ring shape is provided with well shape antiskid line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120079694.8U CN214125877U (en) | 2021-01-13 | 2021-01-13 | Multi-tooth plough for agricultural machinery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120079694.8U CN214125877U (en) | 2021-01-13 | 2021-01-13 | Multi-tooth plough for agricultural machinery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214125877U true CN214125877U (en) | 2021-09-07 |
Family
ID=77547287
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120079694.8U Expired - Fee Related CN214125877U (en) | 2021-01-13 | 2021-01-13 | Multi-tooth plough for agricultural machinery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214125877U (en) |
-
2021
- 2021-01-13 CN CN202120079694.8U patent/CN214125877U/en not_active Expired - Fee Related
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| 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: 20210907 |