CN210470205U - Efficient weeding machine for fruit tree planting - Google Patents
Efficient weeding machine for fruit tree planting Download PDFInfo
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- CN210470205U CN210470205U CN201921155647.6U CN201921155647U CN210470205U CN 210470205 U CN210470205 U CN 210470205U CN 201921155647 U CN201921155647 U CN 201921155647U CN 210470205 U CN210470205 U CN 210470205U
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- fruit tree
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- 235000013399 edible fruits Nutrition 0.000 title claims abstract description 26
- 238000009333 weeding Methods 0.000 title claims abstract description 23
- 210000003781 tooth socket Anatomy 0.000 claims description 3
- 241000196324 Embryophyta Species 0.000 abstract description 27
- 244000309464 bull Species 0.000 description 6
- 244000025254 Cannabis sativa Species 0.000 description 2
- 241000124284 Mitella diphylla Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002420 orchard Substances 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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Abstract
The utility model relates to a technical field is planted to the fruit tree, specifically is a high-efficient weeder is planted to fruit tree, the on-line screen storage device comprises a base, the rear end of base is connected with and pushes away the frame, and the both sides limit lower extreme of base is connected with the wheel, two baffles are installed in the correspondence of the upper end of base, and the upper end of base is located one of them the power pack is installed in the outside of baffle. This design adopts reciprocating motion with the blade, make bottom knife and top knife produce the dislocation, and then can cut weeds, and then realize the purpose of weeding, and utilize the cooperation of electric putter and connecting plate to use, conveniently adjust the distance between blade and the ground, utilize the cooperation of rake teeth and baffle to use simultaneously, the convenient weeds after cutting are hugged into between two baffles, make things convenient for the staff to hug it in the collecting hopper, this weeder not only can cut weeds fast, and can collect weeds after the cutting, realize disposable thorough weeding, time saving and labor saving.
Description
Technical Field
The utility model relates to a fruit tree planting technical field specifically is a high-efficient weeder is planted to fruit tree.
Background
Mowers are also known as weed trimmers, lawnmowers, lawn trimmers, and the like. The mower is a mechanical tool for trimming lawns, vegetations and the like, and consists of a cutter head, an engine, traveling wheels, a traveling mechanism, blades, handrails and a control part, wherein in the fruit tree planting process, workers need to continuously clear weeds in an orchard to ensure that fruit trees can thrive.
The traditional weeder is characterized in that a cutter head is arranged on a travelling wheel, an engine is arranged on the cutter head, a blade is arranged on an output shaft of the engine, the blade utilizes the high-speed rotation of the engine to drive the blade to cut weeds, the cutting mode is easy to splash the weeds, the blade is extremely easy to damage, the traditional weeder is not perfect in collecting the cut weeds, the excessive weeds are easy to leave, secondary cleaning is needed, time and labor are wasted, and the distance between the blade and the ground is not perfect. Therefore, the technical personnel in the field provide a high-efficiency weeding machine for planting fruit trees to solve the problems in the background technology.
Disclosure of Invention
An object of the utility model is to provide a high-efficient weeder is planted to fruit tree to solve the problem that proposes in the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme: a high-efficiency weeding machine for fruit tree planting comprises a base, wherein the rear end of the base is connected with a pushing frame, the lower ends of two side edges of the base are connected with wheels, the upper end of the base is correspondingly provided with two baffles, a power supply box is arranged at the outer side of one baffle, a motor A is arranged at a position, close to one side of the power supply box, of the upper end of the base, a rotating roller is arranged at the front side of the baffle, the two sides of the front end of the base are correspondingly provided with two guide plates, a lower blade is arranged between the two guide plates at the front end of the base, an upper blade is arranged at a position, right above the lower blade, of the front end of the base, a collecting hopper is arranged between the two baffles at the rear end of the base, a controller is arranged at the upper end of the pushing frame, and a motor B is arranged at the outer side of the other baffle at the upper surface of the, the roller is characterized in that mounting seats are mounted at two ends of the rotating roller, belt pulleys are arranged on the outer side surfaces of the mounting seats and the output end of the motor A, at least four groups of rake teeth are uniformly wound on the outer surface of the rotating roller, and the rake teeth are of an L-shaped structure.
As a further aspect of the present invention: a high-efficiency weeding machine for fruit tree planting comprises a base, wherein the rear end of the base is connected with a pushing frame, the lower ends of two side edges of the base are connected with wheels, the upper end of the base is correspondingly provided with two baffles, a power supply box is arranged at the outer side of one baffle, a motor A is arranged at a position, close to one side of the power supply box, of the upper end of the base, a rotating roller is arranged at the front side of the baffle, the two sides of the front end of the base are correspondingly provided with two guide plates, a lower blade is arranged between the two guide plates at the front end of the base, an upper blade is arranged at a position, right above the lower blade, of the front end of the base, a collecting hopper is arranged between the two baffles at the rear end of the base, a controller is arranged at the upper end of the pushing frame, and a motor B is arranged at the outer side of the other baffle at the upper surface of the, the roller is characterized in that mounting seats are mounted at two ends of the rotating roller, belt pulleys are arranged on the outer side surfaces of the mounting seats and the output end of the motor A, at least four groups of rake teeth are uniformly wound on the outer surface of the rotating roller, and the rake teeth are of an L-shaped structure.
As a further aspect of the present invention: the wheel is provided with four altogether, is located the both sides limit of base respectively, two the lower surface that is located the base between the wheel is provided with the connecting plate, be provided with electric putter between connecting plate and the base, and connecting plate and base pass through electric putter fixed connection, electric putter is provided with four altogether.
As a further aspect of the present invention: the cutting tool is characterized in that a groove is formed in the position, corresponding to the lower blade, of the front surface of the base, a sliding rail is formed in the upper surface of the inner portion of the groove, a sliding plate is connected to the position, located in the groove, of one end of the lower blade, a sliding seat is arranged at the position, corresponding to the sliding rail, of the upper end of the sliding plate, and the sliding plate is connected with the groove in a sliding mode through the sliding seat and the sliding.
As a further aspect of the present invention: the rear side of one end of the sliding plate is located in the groove, a connecting seat is fixedly connected with the inside of the groove, a tooth groove is formed in the middle of the connecting seat, two rows of linear teeth are correspondingly arranged on the inner side face of the tooth groove, a reciprocating gear is arranged at the position, corresponding to the groove, of the lower end of the motor B, teeth matched with the linear teeth are arranged on the surface of the reciprocating gear, and the area of the teeth accounts for one fourth of the total area of the outer surface of the reciprocating gear.
As a further aspect of the present invention: the rear side of one end of the sliding plate is located in the groove, a connecting seat is fixedly connected with the inside of the groove, a tooth groove is formed in the middle of the connecting seat, two rows of linear teeth are correspondingly arranged on the inner side face of the tooth groove, a reciprocating gear is arranged at the position, corresponding to the groove, of the lower end of the motor B, teeth matched with the linear teeth are arranged on the surface of the reciprocating gear, and the area of the teeth accounts for one fourth of the total area of the outer surface of the reciprocating gear.
As a further aspect of the present invention: the distance between the two baffle plates is the same as the width of the inlet of the collecting hopper, and the baffle plates and the guide plates are both of an L-shaped structure.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses a high-efficient weeder is planted to fruit tree, in the actual operation, adopt reciprocating motion to the bottom knife, when weeds are located between two bottom knives, the reciprocating motion of bottom knife can make it misplace with the top knife, and then can cut weeds, and then realize the purpose of weeding, utilize this cutting mode to replace the traditional mode of blade rotary cutting, not only cutting efficiency is good, and not fragile blade, solve the problem that traditional blade high-speed rotary cutting not only easily causes weeds to splash everywhere, also can make the blade very easily receive the damage, and adopt the cooperation of electric putter and connecting plate between base and wheel to use, conveniently adjust the distance between wheel and base, and then be convenient for adjust the distance between blade and ground, conveniently control the height of blade, utilize the cooperation of harrow tooth and baffle to use simultaneously, conveniently hug the weeds after cutting between two baffles, make things convenient for the staff to hug it into in the collecting bucket, this weeder not only can cut weeds fast, can collect the weeds after the cutting, realizes once only thoroughly weeding, and labour saving and time saving operates simple and direct moreover, and the signal extensively uses widely.
Drawings
FIG. 1 is a schematic structural view of a high-efficiency weeder for fruit tree planting;
FIG. 2 is a schematic view of the installation of a motor B in the efficient fruit tree planting weeding machine;
FIG. 3 is a schematic view of the connection between a motor A and a rotating roller in the efficient fruit tree planting weeding machine;
FIG. 4 is a schematic view of the connection between the base and the wheels of the efficient weeder for fruit tree planting;
fig. 5 is a schematic view of the connection between the lower blade and the reciprocating gear in the efficient fruit tree planting weeding machine.
In the figure: 1. a base; 2. pushing the frame; 3. a controller; 4. a wheel; 5. a power supply box; 6. a motor A; 7. a lower blade; 8. an upper blade; 9. rotating the roller; 10. a guide plate; 11. a baffle plate; 12. a collecting hopper; 13. a motor B; 14. rake teeth; 15. a belt pulley; 16. a mounting seat; 17. a connecting plate; 18. an electric push rod; 19. a groove; 20. a slide rail; 21. a slide base; 22. a sliding plate; 23. a reciprocating gear; 24. linear teeth; 25. a connecting seat.
Detailed Description
Referring to fig. 1-5, in the embodiment of the present invention, a high-efficiency weeding machine for fruit tree planting comprises a base 1, a pushing frame 2 is connected to the rear end of the base 1, wheels 4 are connected to the lower ends of the two side edges of the base 1, two baffles 11 are correspondingly installed on the upper end of the base 1, a power box 5 is installed on the upper end of the base 1 at the outer side of one of the baffles 11, a motor a6 (model Y90L-4) is installed at a position of the upper end of the base 1 close to one side of the power box 5, a rotating roller 9 is installed at the upper end of the base 1 at the front side of the baffle 11, two guide plates 10 are correspondingly installed at the two sides of the front end of the base 1, a lower blade 7 is installed between the two guide plates 10 at the front end of the base 1, an upper blade 8 is installed at a position of the front end of the base 1 directly above the lower blade 7, a collecting bucket 12, the upper end of the pushing frame 2 is provided with a controller 3 (model is MAM-300), the upper surface of the base 1 is positioned at the outer side of the other baffle 11 and is provided with a motor B13 (model is Y90L-4), two ends of the rotating roller 9 are provided with mounting seats 16, the outer side surface of the mounting seat 16 and the output end of the motor A6 are both provided with belt pulleys 15, the outer surface of the rotating roller 9 is uniformly surrounded with at least four groups of rake teeth 14, and the rake teeth 14 are of an L-shaped structure.
In fig. 3: the belt has been cup jointed to belt pulley 15's surface, be provided with the bull stick between belt pulley 15 and the mount pad 16, and the one end of bull stick runs through mount pad 16 and commentaries on classics roller 9 fixed connection, the other end of bull stick and a side fixed connection of belt pulley 15, and the junction of bull stick and mount pad 16 is provided with the pivot, motor A6 passes through belt pulley 15 and belt rotation with commentaries on classics roller 9 and is connected, mount pad 16 and the front surface vertical fixation of baffle 11, through the work of controller 3 control motor A6, and then drive the bull stick by motor A6 utilization belt and belt pulley 15 and rotate, further bull stick can drive commentaries on classics roller 9 and rotate, be convenient for when weeder work, utilize harrow tooth 14 on the commentaries on classics roller 9 to hug the grass between two baffles 11, be convenient for the blade to cut off it and remove it to collection fill 12 in through the passageway between two baffles 11.
In fig. 4: the wheels 4 are provided with four wheels, the two wheels are respectively positioned on two side edges of the base 1, the lower surface of the base 1 between the two wheels 4 is provided with the connecting plate 17, an electric push rod 18 (the model is ANT-52) is arranged between the connecting plate 17 and the base 1, the connecting plate 17 and the base 1 are fixedly connected through the electric push rod 18, the electric push rod 18 is provided with four wheels, in operation, the controller 3 can be used for controlling the electric push rod 18 to work, the electric push rod 18 stretches out and draws back to adjust the distance between the connecting plate 17 and the base 1, two electric push rods 18 are correspondingly arranged on each connecting plate 17, one button on each two electric push rods 18 share the controller 3, the controller 3 is convenient to control the distance between the connecting plate 17 and the base to control the height of the base 1, and the distance between the lower blade 7 and.
In fig. 4 and 5: a groove 19 is formed in the front surface of the base 1 corresponding to the position of the lower blade 7, a slide rail 20 is formed in the upper surface of the inner portion of the groove 19, a slide plate 22 is connected to one end of the lower blade 7 at the position corresponding to the inner portion of the groove 19, a slide base 21 is arranged at the upper end of the slide plate 22 corresponding to the position of the slide rail 20, the slide plate 22 is connected with the groove 19 in a sliding manner through the slide base 21 and the slide rail 20, a connecting base 25 is fixedly connected to the rear side of one end of the slide plate 22 at the inner portion of the groove 19, a tooth space is formed in the middle of the connecting base 25, two rows of linear teeth 24 are correspondingly arranged on the inner side of the tooth space, a reciprocating gear 23 is arranged at the lower end of the motor B13 corresponding to the position of the groove, teeth matched with the linear teeth 24 are arranged on the surface of the reciprocating gear 23, one end of the shaft rod penetrates through the base 1 to be vertically connected with the reciprocating gear 23, the other end of the shaft rod is fixedly connected with the output end of the motor B13, the rear end of the upper blade 8 is fixedly connected with a mounting plate, the upper blade 8 is fixedly connected with the base 1 through the mounting plate, the distance between the upper blade 8 and the lower blade 7 is 2cm, the connecting seat 25 is positioned inside the groove 19 and connected with the sliding plate 22, and the connecting seat 25 is in sliding connection with the groove 19 through the sliding plate 22, therefore, in operation, the motor B13 is controlled by the controller 3 to work, the motor B13 drives the reciprocating gear 23 to rotate through the shaft rod, teeth on the surface of the reciprocating gear 23 are meshed with one linear tooth 24 on the inner side surface of the tooth socket when rotating for half a circle, the connecting seat 25 and the sliding plate 22 are driven to linearly move along the sliding rail 20 in the groove 19, when the teeth on the surface of the reciprocating gear 23 rotate, will engage with another linear tooth 24 on the other inner side of the tooth slot, and the reciprocating gear 23 will drive the connecting seat 25 and the sliding plate 22 to slide in the sliding rail 20 to the initial position, and then the motor B13 drives the reciprocating gear 23 to repeatedly engage with the two opposite linear teeth 24 in the tooth grooves, so as to realize the linear reciprocating motion of the connecting seat 25 and the sliding plate 22, further realizing the linear reciprocating motion of the lower blade 7, because the upper blade 8 is fixedly connected with the base 1 through the mounting plate, the upper blade 8 is fixed, and the lower blade 7 reciprocates, when weeds are between the two lower blades 7, the reciprocating movement of the lower blades 7 causes them to be misaligned with the upper blades 8, and then the weeds are cut, and the purpose of weeding is achieved, and the length of the sliding plate 22 driven by the reciprocating gear 23 to move by half a turn is larger than the distance between the two lower blades 7.
In fig. 1: the distance is the same with the entry width of collecting bucket 12 between two baffles 11, and baffle 11 and deflector 10 are L type structure, utilize the convenient position with weeds cisoid blade of cooperation of deflector 10, the blade of being convenient for cuts weeds, and utilize the cooperation of baffle 11 to use, conveniently make the weeds after the cutting move to between two baffles 11 by the passageway between two baffles 11, also make things convenient for the staff to hug weeds into in collecting bucket 12 simultaneously, avoid the weeds of excision to pile up on the motor and influence its use.
The utility model discloses a theory of operation is: when the design is used, the electric push rod 18 is controlled to work by using a corresponding control button on the controller 3, the electric push rod 18 extends and retracts to adjust the distance between the connecting plate 17 and the base 1, the controller 3 is convenient to control the distance between the connecting plate 17 and the base to control the height of the base 1, the distance between the lower blade 7 and the ground is further convenient to adjust, then the controller 3 is used for controlling the motor B13 to work, the motor B13 drives the reciprocating gear 23 to rotate through a shaft rod, the reciprocating gear 23 and the two linear teeth 24 in the tooth grooves are repeatedly engaged to realize the linear reciprocating motion of the connecting seat 25 and the sliding plate 22, and further the linear reciprocating motion of the lower blade 7 can be realized, because the upper blade 8 is fixedly connected with the base 1 through the mounting plate, the upper blade 8 is fixed, and the lower blade 7 performs reciprocating motion, lower blade 7 and upper slitter piece 8 can produce the dislocation, when weeds are located between the blade, the removal of lower blade 7 can cut weeds, and then realize the purpose of weeding, and control motor A6 work through controller 3, and then utilize belt and belt pulley 15 to drive by motor A6 and change roller 9 and rotate, be convenient for when the weeder is worked, utilize rake teeth 14 on changeing roller 9 to hug the grass into between two baffles 11, conveniently make the weeds after the cutting move to in collecting hopper 12 by the passageway between two baffles 11, avoid the weeds of excision to pile up on the motor and influence its use, this design not only the operation is simple and direct, weeding efficiency is fast, and can collect to the weeds after the cutting, realize the effect of once only cutting and clear away.
The above-mentioned, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (7)
1. The efficient weeding machine for fruit tree planting comprises a base (1) and is characterized in that a pushing frame (2) is connected to the rear end of the base (1), wheels (4) are connected to the lower ends of two side edges of the base (1), two baffles (11) are correspondingly installed at the upper end of the base (1), a power supply box (5) is installed at the outer side of one baffle (11) and is located at the upper end of the base (1), a motor A (6) is installed at one side position, close to the power supply box (5), of the upper end of the base (1), a rotating roller (9) is arranged at the front side, located at the baffle (11), of the upper end of the base (1), two guide plates (10) are correspondingly installed at two sides of the front end of the base (1), a lower blade (7) is arranged between the two guide plates (10), an upper blade (8) is installed at the position, located directly above the lower blade (7), of the front end of the base (1), the rear end of base (1) corresponds two install between baffle (11) and collect fill (12), the upper end that pushes away frame (2) is provided with controller (3), the upper surface of base (1) is located another motor B (13) are installed in the outside of baffle (11), mount pad (16) are installed at the both ends of commentaries on classics roller (9), the lateral surface of mount pad (16) and the output of motor A (6) all are provided with belt pulley (15), the surface of commentaries on classics roller (9) evenly encircles there are four at least groups of rake teeth (14), rake tooth (14) are L type structure.
2. The efficient fruit tree planting weeding machine as claimed in claim 1, wherein a belt is sleeved on the outer surface of the belt pulley (15), a rotating rod is arranged between the belt pulley (15) and the mounting seat (16), one end of the rotating rod penetrates through the mounting seat (16) and is fixedly connected with the rotating roller (9), the other end of the rotating rod is fixedly connected with one side face of the belt pulley (15), a rotating shaft is arranged at the joint of the rotating rod and the mounting seat (16), the motor A (6) and the rotating roller (9) are rotatably connected through the belt pulley (15) and the belt, and the mounting seat (16) is vertically fixed with the front surface of the baffle plate (11).
3. The efficient fruit tree planting weeding machine as claimed in claim 1, wherein the number of wheels (4) is four, the wheels are respectively located on two sides of the base (1), a connecting plate (17) is arranged between the two wheels (4) and located on the lower surface of the base (1), an electric push rod (18) is arranged between the connecting plate (17) and the base (1), the connecting plate (17) and the base (1) are fixedly connected through the electric push rod (18), and the number of the electric push rods (18) is four.
4. The efficient fruit tree planting weeding machine as claimed in claim 1, wherein a groove (19) is formed in a position, corresponding to the lower blade (7), of the front surface of the base (1), a sliding rail (20) is formed in an inner upper surface of the groove (19), a sliding plate (22) is connected to a position, corresponding to the sliding rail (20), of one end of the lower blade (7), a sliding seat (21) is arranged at a position, corresponding to the sliding rail (20), of an upper end of the sliding plate (22), and the sliding plate (22) and the groove (19) are slidably connected through the sliding seat (21) and the sliding rail (20).
5. The efficient fruit tree planting weeding machine as claimed in claim 4, wherein the rear side of one end of the sliding plate (22) is fixedly connected with a connecting seat (25) inside the groove (19), a tooth socket is formed in the middle of the connecting seat (25), two rows of linear teeth (24) are correspondingly arranged on the inner side of the tooth socket, a reciprocating gear (23) is arranged at the lower end of the motor B (13) corresponding to the groove, teeth matched with the linear teeth (24) are arranged on the surface of the reciprocating gear (23), and the area of the teeth accounts for one quarter of the total area of the outer surface of the reciprocating gear (23).
6. The efficient fruit tree planting weeding machine as claimed in claim 5, wherein a shaft rod is arranged between the reciprocating gear (23) and the motor B (13), one end of the shaft rod penetrates through the base (1) to be vertically connected with the reciprocating gear (23), the other end of the shaft rod is fixedly connected with the output end of the motor B (13), a mounting plate is fixedly connected to the rear end of the upper blade (8), the upper blade (8) is fixedly connected with the base (1) through the mounting plate, and the distance between the upper blade (8) and the lower blade (7) is 2 cm.
7. The efficient fruit tree planting weeding machine as claimed in claim 1, wherein the distance between two baffles (11) is the same as the inlet width of the collecting bucket (12), and the baffles (11) and the guide plate (10) are both L-shaped structures.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921155647.6U CN210470205U (en) | 2019-07-23 | 2019-07-23 | Efficient weeding machine for fruit tree planting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921155647.6U CN210470205U (en) | 2019-07-23 | 2019-07-23 | Efficient weeding machine for fruit tree planting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210470205U true CN210470205U (en) | 2020-05-08 |
Family
ID=70532046
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921155647.6U Expired - Fee Related CN210470205U (en) | 2019-07-23 | 2019-07-23 | Efficient weeding machine for fruit tree planting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210470205U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111406501A (en) * | 2020-05-18 | 2020-07-14 | 广东电网有限责任公司 | Weeding device and weeding vehicle |
| CN111869647A (en) * | 2020-08-20 | 2020-11-03 | 陕西工业职业技术学院 | A device and method for shoveling turf |
| CN113508680A (en) * | 2021-03-25 | 2021-10-19 | 河北冀东建设工程有限公司 | Spartina alterniflora treatment method and mower used for same |
-
2019
- 2019-07-23 CN CN201921155647.6U patent/CN210470205U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111406501A (en) * | 2020-05-18 | 2020-07-14 | 广东电网有限责任公司 | Weeding device and weeding vehicle |
| CN111406501B (en) * | 2020-05-18 | 2021-05-04 | 广东电网有限责任公司 | Weeding device and weeding vehicle |
| CN111869647A (en) * | 2020-08-20 | 2020-11-03 | 陕西工业职业技术学院 | A device and method for shoveling turf |
| CN113508680A (en) * | 2021-03-25 | 2021-10-19 | 河北冀东建设工程有限公司 | Spartina alterniflora treatment method and mower used for same |
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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: 20200508 Termination date: 20210723 |
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| CF01 | Termination of patent right due to non-payment of annual fee |