CN108293330A - Weeder between a kind of corn plants - Google Patents
Weeder between a kind of corn plants Download PDFInfo
- Publication number
- CN108293330A CN108293330A CN201810100906.9A CN201810100906A CN108293330A CN 108293330 A CN108293330 A CN 108293330A CN 201810100906 A CN201810100906 A CN 201810100906A CN 108293330 A CN108293330 A CN 108293330A
- Authority
- CN
- China
- Prior art keywords
- weeding
- weeder
- driving
- shaft
- connect
- 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.)
- Withdrawn
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Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01B—SOIL WORKING IN AGRICULTURE OR FORESTRY; PARTS, DETAILS, OR ACCESSORIES OF AGRICULTURAL MACHINES OR IMPLEMENTS, IN GENERAL
- A01B39/00—Other machines specially adapted for working soil on which crops are growing
- A01B39/12—Other machines specially adapted for working soil on which crops are growing for special purposes, e.g. for special culture
- A01B39/18—Other machines specially adapted for working soil on which crops are growing for special purposes, e.g. for special culture for weeding
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M7/00—Special adaptations or arrangements of liquid-spraying apparatus for purposes covered by this subclass
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
- A01M7/00—Special adaptations or arrangements of liquid-spraying apparatus for purposes covered by this subclass
- A01M7/0089—Regulating or controlling systems
Abstract
The present invention provides weeder between a kind of corn plants, including rack and the weeder that is connect with the rack, and drive dynamic control device is provided in the rack；It further include a pesticide spray equipment, conveying pump drive that the pesticide spray equipment is connect by pesticide box, with pesticide box and the spray head being connect with the delivery hose of conveying pump drive form, and the weeder is by shell, support wheel mechanism, servo motor driving mechanism and weeding mechanism.Seedling-damaging ratio is high when for solving weeding between existing weeder corn plants, cannot remove young grass, and volume is larger, the light technical problem of malfunction, and the technical issues of can solve pesticide spraying simultaneously, moreover it is possible to while the technical issues of solve pesticide spraying.
Description
Technical field
The present invention relates to agricultural machinery engineering fields, and in particular to weeder between a kind of corn plants.
Background technology
Currently, crops field weeding is broadly divided into three kinds of artificial weeding, weeding by machine and chemical agent weeding.Manually remove
Careless seedling-damaging ratio is low, but can expend a large amount of cost of labor and time, and weeding ratio is not high.Chemical agent weeding is not in wound
Growth of cereal crop seedlings condition, herbicidal effect often spray herbicide using thick mad spray pattern in practice also than more significant, cause energy
Source wastes, if herbicide weeding is used for a long time, weeds in field can generate drug-resistant effect to herbicide, and weeding rate is caused to drop
Low, in addition a large amount of remaining herbicides can not only pollute soil, influence the growth of crops.And weeding by machine is can to hold
A key technology in continuous developing agricultural, starts more and more to be paid attention to, on the current technology, in the ranks weeding technique
More mature, weeding ratio can reach 90% or more, but existing weeding by machine's machine between corn plants for when weeding, hindering seedling
Rate is higher, thus the weeds between corn plants more often use when artificial weeding method.
Existing weeding by machine generally uses tillage and weeding or surface mowing two ways to carry out weeding.Tillage and weeding needs
Machinery carries out shallow-layer overturning, loose surface layer soil to soil, directly roots out inter-row weed, and that there are mechanical volumes is big, weeding is inadequate
Flexibly, the shortcomings that weeding seedling-damaging ratio is high between corn plants and is primarily adapted for use in plains region, can not promote suitable for different terrain
The area of landforms uses.So having prior art has proposed surface mowing formula weeder, this type weeder is usually expert at
The above or below for walking machinery hangs a weeder, and three corner graspers or the mode of rotary cutter are installed in weeder end
Weeding, the weeder of the structure still cannot solve the high technical problem of weeding seedling-damaging ratio between corn plants, and and intertillage
Weeding is compared, and surface mowing formula weeder cannot remove children's grass that just germination grows soil surface, and children's grass is grown up, influenced quickly
The growth of crops.It is low therefore, it is necessary to design a kind of seedling-damaging ratio, young grass can be removed and operation is flexible, the weeding of small volume and less weight
Device.
Invention content
It is an object of the invention to：Weeder between a kind of corn plants is provided, is removed between existing weeder corn plants for solving
Seedling-damaging ratio is high when careless, cannot remove young grass, volume is larger, the light technical problem of malfunction, and can also solve simultaneously
The technical issues of pesticide spraying.
The technical solution adopted by the present invention is as follows：
Weeder between a kind of corn plants, including rack and the weeder that is connect with the rack are set in the rack
It is equipped with drive dynamic control device；Further include a pesticide spray equipment, the pesticide spray equipment is connect by pesticide box, with pesticide box
Conveying pump drive and with conveying pump drive delivery hose connect spray head composition, the weeder by
Shell, support wheel mechanism, servo motor driving mechanism and weeding mechanism；The support wheel mechanism by two land wheels, with it is described
The proximity sensor that can identify maize seedling taken turns the support shaft of mating connection and be arranged in support shaft is constituted, the support
Axis passes through in the height-adjustable individual profiling mechanism being connected in frame body of secure component；The shell passes through fastening
Bolt is fixed in the support shaft of the support wheel mechanism；The servo motor driving mechanism by servo motor drive component and
51 microcontrollers are constituted, and the servo motor drive component setting is in case top and output shaft is driven to stretch into enclosure interior；It is described
51 microcontrollers are arranged on the inner wall in shell and are electrically connected with servo motor drive component, with the proximity sensor communication link
It connects；The driving mechanism that the weeding mechanism is kept away seedling movement by weeding knife assembly and driving weeding knife assembly is constituted, and described removes
Careless knife assembly is fastened on by two weeding knifes, the cutter shaft being connect with weeding knife and by cutter shaft one end in the driving mechanism respectively
Clamp device, the driving of the driving mechanism and servo motor drive component exports axis connection, the pesticide box and delivery pump
Driving device is arranged between corn plants in the frame body of weeder, and spray head setting is in weeder outer casing bottom two
On through-hole between cutter shaft, the conveying pump drive is connect by hose with the spray head.
The preferred hose through the shell of weeder and the shell of weeding mechanism enter drive gear assemblies with it is outer
In the space that shell bottom is formed, and it is connected on the through-hole.
Preferably, the driving mechanism include shell and the drive bearing assembly for being respectively arranged at the enclosure,
The drive gear assemblies being connect with drive bearing assembly and the spring assembly being connect with the weeding knife assembly；The drive shaft
Bearing assembly is made of driving shaft and driven shaft, the drive gear assemblies by driving gear, actuating cam, driven gear and from
Moving cam is constituted, and the driving output shaft of weeding mechanism biology shell and servo motor driving mechanism is run through in the driving shaft upper end
Connection, lower end are connected on the inner wall of the outer casing bottom of weeding mechanism, on the driving shaft of the driving gear connection inside the shell,
The actuating cam is arranged below driving gear and is connected on driving shaft；The driven shaft is laterally set up in parallel with driving shaft
In the shell of weeding mechanism, the driven gear be connected on driven shaft and with the active gear teeth are ratcheting connects, and
An inverted cam is connected on driven shaft below driven gear.
Preferably, the spring assembly include the bearing with sliding slot being set in weeding mechanism shell on rear wall, it is right
Claim two springs being arranged in the bearing sliding slot and the oscillating rod being connect respectively with spring, one end difference of the spring
The both ends of bearing are connected to, the spring other end is connect with one end of the oscillating rod, the other end connection of the oscillating rod
On cutter shaft.
In conclusion by adopting the above-described technical solution, the beneficial effects of the invention are as follows：
1. the weeder using this programme works, the height of cutter shaft is adjusted, determines the embedded depth of weeding knife, driven
Device driving weeder travels forward, and operating personnel hold handrail control direction and move ahead with weeder, and two weeding knifes pass through drive
Weeds in soil are connected root removal by power, and when weeding knife is close to seedling, proximity sensor sends out signal to 51 microcontrollers, and 51 is single
Rotation instruction is passed to servo motor driving device, then servo motor driving device driving is slided by piece machine by after signal processing
Wheel assembly rotates, and the oscillating rod on cutter shaft is press-connected after the blade rotation of cam, and the oscillating rod rotation drives cutter shaft to turn
It is dynamic, cause weeding knife to rotate backward, after avoiding seedling, oscillating rod is retracted reset by spring assembly, completes weeding work between a seedling,
Seedling-damaging ratio is high between efficiently solving strain, and young grass goes indivisible technical problem.The apparatus structure is simple simultaneously, and lighter in weight is right
It, also can light weeding with Manual-pushing even without drive dynamic control device when the more loose soil of soil property carries out weeding.
2. worked using the weeder described in this programme, after proximity sensor sends out signal to 51 microcontrollers, watch
Take motor driving mowing-apparatus completion keep away seedling action while, signal can be passed to conveying pump controller by 51 microcontrollers simultaneously,
It completes a pesticide and sprays work.Agro-farming personnel complete the pesticide spraying work to crops while weeding, simple high
Effect can save a large amount of time and human cost, and the device also has pesticide flow control accurate, and sprinkling position is accurate,
It is inhomogenous to solve conventional spray mode pesticide spraying, sprinkling is excessive to lead to pesticide residue, results in waste of resources and contaminated soil
The technical issues of.
Description of the drawings
Fig. 1 is the structure chart of weeder between corn plants described in embodiment 1；
Fig. 2 is the partial enlarged view of the weeding mechanism of the weeder；
Fig. 3 is having described in embodiment 2 while the weeding mechanism for function of spraying insecticide；
Fig. 4 is the structure chart of the actuating cam and inverted cam of the weeding mechanism.
In figure label for：1- racks；2- drive dynamic control devices；3- pesticide box；4- conveys pump drive；5- individual profilings
Mechanism；6- support wheels mechanism；7- proximity sensors；8- weeders；9- servo motor driving mechanisms；10-51 microcontrollers；11-
Weeding mechanism；12- driving shafts；13- driven shafts；14- driving gears；15- driven gears；16- actuating cams；17- inverted cams；
18- springs；19- oscillating rods；20- cutter shafts；21- weeding knifes；22- retention mechanisms；23- hoses；24- spray heads；25- convex bodys；26-
Blade.
Specific implementation mode
All features disclosed in this specification can be with any other than mutually exclusive feature and/or step
Mode combines.
It elaborates to the present invention with reference to figure attached drawing.
Embodiment 1
The drive dynamic control device that driving rack 1 moves is arranged in rack 1 in weeder between a kind of corn plants, including rack 1
2 and the weeder 8 that is connect with rack 1.The rack 1 is by handrail, the frame body being fixedly connected with handrail and setting
It is formed in frame body bottom runner.The drive dynamic control device 2 is made of driving motor and buffering stand, the buffering branch
Frame is connected in frame body, and the drive dynamic control device 2 is connected on buffering stand.The driving of the drive dynamic control device 2
Output shaft is connect by drive component with the runner for being arranged in frame body bottom, for driving runner to rotate, is driven to realize
Dynamic entire rack 1 moves.
The weeder 8 is connected to by one group of individual profiling mechanism 5 in frame body, individual profiling mechanism 5 and machine
It is connected using U bolt between frame ontology, the lateral displacement amplitude of weeder 8 can be adjusted by adjusting nut, so as to remove
Careless machine is suitable for different row spacing operations, while also allowing for weeder and turning at sill u-turn.
The weeder 8 includes shell, support wheel mechanism 6, servo motor driving mechanism 9 and weeding mechanism 11.
The support wheel mechanism 6 is by the support shaft and setting of two land wheels and the mating connection of the land wheel in support shaft
The upper height-adjustable proximity sensor 7 that can identify maize seedling is constituted, the support shaft by bolt height-adjustablely
The other end for one group of individual profiling mechanism 5 being connected in frame body with one end is connect.
The shell is fixed on by fastening bolt in the support shaft of the support wheel mechanism 6, for carrying servo electricity
Machine drive component and 51 microcontrollers 10.
The servo motor driving mechanism 9 is made of servo motor drive component and 51 microcontrollers 10, the servo electricity
The setting of machine drive component stretches into enclosure interior in case top, driving output shaft.51 microcontroller 10 is arranged in shell
It is electrically connected on inner wall and with servo motor drive component, is communicated to connect with the proximity sensor.
The weeding mechanism 11 is by being set to shell, drive bearing assembly, drive gear assemblies and the spring of enclosure interior
The weeding knife assembly that component and part are set to enclosure interior is constituted.
The drive bearing assembly includes driving shaft 12 and driven shaft 13.
The drive gear assemblies include driving gear 14, actuating cam 16, driven gear 15 and inverted cam 17.
Driving output shaft of 12 upper end of driving shaft through the shell and servo motor driving mechanism 9 of weeding mechanism 11
Connection, lower end is connected on the inner wall of 11 outer casing bottom of weeding mechanism.The driving shaft of the connection of the driving gear 14 inside the shell
On 12, the actuating cam 16 is arranged below driving gear 14 and is connected on driving shaft 12.
Driven shaft 13 and driving shaft 12 be laterally set up in parallel in the shell of weeding mechanism 11, the driven wheel be connected to from
On moving axis 13 and with 14 tooth of driving gear and connect, and connected on the driven shaft 13 below driven gear 15 one from
Moving cam 17,17 position of the inverted cam are slightly above actuating cam 16, and the blade 26 of the inverted cam 17 made is placed in actively convex
26 top of blade of wheel 16, two blades mutually collide when cam being avoided to rotate, while also saving housing interior volume.
The weeding knife assembly respectively by two groups of weeding knifes 21, with 21 matching used cutter shaft 20 of weeding knife and tight
It is fixedly mounted with and sets 22.20 one end of the cutter shaft connects weeding knife 21, is set to hull outside, and the other end runs through housing bottom and shell bottom
Portion is fixed on by the clamp device 22 on the bottom in the shell of weeding mechanism 11.
The actuating cam and inverted cam are made of convex body 25 and blade 26.
The spring assembly by be set in 11 shell of weeding mechanism on rear wall two with sliding slot bearing, setting exist
Spring 18 in the bearing sliding slot and the oscillating rod 19 being connect respectively with spring 18 are constituted.One end of two springs 18
The both ends of bearing are connected to, 18 other end of the spring is connect with one end of the oscillating rod 19, the oscillating rod 19
The other end is connected on cutter shaft 20.
When being worked using the weeder 8 of this programme, the height of cutter shaft 20 is adjusted, determines the embedded depth of weeding knife 21,
Drive dynamic control device 2 drives weeder to travel forward, and operating personnel hold handrail control direction and move ahead with weeder, two weedings
Weeds in soil are connected root removal by knife 21 by driving force, and when weeding knife 21 is close to seedling, proximity sensor 7 is to 51 microcontrollers
10 send out signal, and rotation instruction is passed to servo motor driving mechanism 9, then servo by 51 microcontrollers 10 by after signal processing
9 driving pulley component of motor-driven mechanism rotates, and the oscillating rod 19 on cutter shaft 20 is press-connected after the rotation of blade 26 of cam,
The rotation of the oscillating rod 19 drives cutter shaft 20 to rotate, and causes weeding knife 21 to rotate backward, avoids seedling.After avoiding seedling, spring assembly
Oscillating rod 19 is retracted into reset, completes weeding work between a seedling.
Embodiment 2
For the seedling of plantation, in order to prevent insect pest, it usually needs spray insecticide on seedling surface.Therefore embodiment 2 is
Improvement to embodiment 1, improved place be, installed on 1 ontology of the rack pesticide box 3 and with the agriculture
The conveying pump drive 4 that medicine-chest 3 connects, the conveying pump drive 4 are logical by signal transducer and 51 microcontrollers 10
Letter connection.
It is arranged in the space that the drive gear assemblies of the weeding mechanism 11 are formed with bottom in weeding mechanism 11 shell
One through-hole, point-blank, and the through-hole is to two cutter shafts 20 at the center of the through-hole center of circle and two cutter shafts 20
The distance between it is equal.The delivery hose 23 being connect with the conveying pump drive 4 passes through the shell of weeder 8, and wears
11 cage connection of weeding mechanism is crossed on through-hole, and is arranged in two 20 middles of cutter shaft of the housing bottom of weeder 8
One spray head 24, the inlet of the spray head 24 are connect with the hose 23 in the pupil.
When being worked using the weeder 8 described in this programme, after proximity sensor 7 sends out signal to 51 microcontrollers 10,
While servo motor driving weeding mechanism 11 completes to keep away seedling action, signal can be passed to delivery pump drive by 51 microcontrollers 10 simultaneously
Dynamic device completes a pesticide and sprays work.Agro-farming personnel complete the pesticide spraying work to crops while weeding,
It is simple and efficient, a large amount of time and human cost can be saved, and the device also has pesticide flow control accurate, spray position
Accurately, it is inhomogenous to solve conventional spray mode pesticide spraying, sprinkling is excessive to lead to pesticide residue, results in waste of resources and pollutes
The technical issues of soil.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, and can also be dismantling connection for example, it may be being fixedly connected, or one
Ground connects；It can be mechanical connection, can also be electrical connection；It can be directly connected, intermediate media's brief introduction phase can also be passed through
Even, can be the connection inside two elements.For the ordinary skill in the art, can understand as the case may be
The concrete meaning of above-mentioned term in the present invention.
Claims (4)
1. weeder between a kind of corn plants, including rack (1) and the weeder that is connect with the rack, is set in the rack
It is equipped with drive dynamic control device, it is characterised in that：Further include a pesticide spray equipment, the pesticide spray equipment is by pesticide box
(3), the conveying pump drive (4) being connect with pesticide box (3) and delivery hose (23) company with conveying pump drive (4)
Spray head (24) composition connect, the weeder is by shell, support wheel mechanism (6), servo motor driving mechanism (9) and weeding
Mechanism (11)；The support wheel mechanism (6) is supporting by two land wheels, with the support shaft of the mating connection of the land wheel and setting
The proximity sensor (7) that can identify maize seedling on axis is constituted, and the support shaft passes through the height-adjustable company of secure component
It is connected in the individual profiling mechanism (5) in frame body；The shell is fixed on the support wheel mechanism by fastening bolt
(6) in support shaft；The servo motor driving mechanism (9) is made of servo motor drive component and 51 microcontrollers (10),
The servo motor drive component setting is in case top and output shaft is driven to stretch into enclosure interior；51 microcontroller (10) sets
It sets on the inner wall in shell and is electrically connected with servo motor drive component, communicated to connect with the proximity sensor (7)；It is described
The driving mechanism that weeding mechanism (11) is kept away seedling movement by weeding knife assembly and driving weeding knife assembly is constituted, the weeding knife
Component is fastened on institute by two weeding knifes (21), the cutter shaft (20) being connect with weeding knife (21) and by cutter shaft (20) one end respectively
The clamp device (22) in driving mechanism is stated, the driving mechanism and the driving of servo motor drive component export axis connection, institute
It states pesticide box (3) and conveying pump drive (4) is arranged between corn plants in the frame body of weeder, the spray head (24)
It is arranged on the through-hole between two cutter shafts (20) of weeder outer casing bottom, the conveying pump drive (4) passes through hose
(23) it is connect with the spray head (24).
2. weeder between a kind of corn plants according to claim 1, it is characterised in that：The hose (23) fills through weeding
The shell of the shell and weeding mechanism (11) of setting (8) enters in the space that drive gear assemblies are formed with outer casing bottom, and connects
On the through-hole.
3. weeder between a kind of corn plants according to claim 1, it is characterised in that：The driving mechanism include shell,
And be respectively arranged at the drive bearing assembly of the enclosure, the drive gear assemblies being connect with drive bearing assembly and
The spring assembly being connect with the weeding knife assembly；The drive bearing assembly is made of driving shaft (12) and driven shaft (13),
The drive gear assemblies are made of driving gear (14), actuating cam (16), driven gear (15) and inverted cam (17),
Driving output shaft of described driving shaft (12) upper end through weeding mechanism (11) biological shell and servo motor driving mechanism (9)
Connection, lower end are connected on the inner wall of the outer casing bottom of weeding mechanism (11), and the driving gear (14) connects inside the shell
On driving shaft (12), actuating cam (16) setting is below driving gear (14) and is connected on driving shaft (12)；It is described
Driven shaft (13) is laterally set up in parallel with driving shaft (12) in the shell of weeding mechanism (11), and the driven gear (15) connects
On driven shaft (13) and with the active gear teeth (14) are ratcheting connects, and the driven shaft (13) below driven gear (15)
One inverted cam (17) of upper connection.
4. weeder between a kind of corn plants according to claim 2, it is characterised in that：The spring assembly includes being set to
The bearing with sliding slot in weeding mechanism (11) shell on rear wall, two springs being symmetricly set in the bearing sliding slot
(18) and respectively one end of the oscillating rod (19) being connect with spring (18), the spring (18) is connected to the two of bearing
End, spring (18) other end are connect with one end of the oscillating rod (19), and the other end of the oscillating rod (19) is connected to
On cutter shaft (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810100906.9A CN108293330A (en) | 2018-02-01 | 2018-02-01 | Weeder between a kind of corn plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810100906.9A CN108293330A (en) | 2018-02-01 | 2018-02-01 | Weeder between a kind of corn plants |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108293330A true CN108293330A (en) | 2018-07-20 |
Family
ID=62850789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810100906.9A Withdrawn CN108293330A (en) | 2018-02-01 | 2018-02-01 | Weeder between a kind of corn plants |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108293330A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109699208A (en) * | 2019-02-25 | 2019-05-03 | 东北农业大学 | Weeder between a kind of intelligence cutting disc strain |
| CN112075409A (en) * | 2020-10-13 | 2020-12-15 | 河南半夏农业科技有限公司 | Highly-differentiated herbicide smearing machine and weeding method |
| CN113748753A (en) * | 2021-09-30 | 2021-12-07 | 福州大学 | Hoe-shovel type end effector and working method thereof |
| EP4265087A1 (en) * | 2022-04-19 | 2023-10-25 | Feldklasse GmbH | Module for working the soil of a culture, trailer for a tractor and its use |
-
2018
- 2018-02-01 CN CN201810100906.9A patent/CN108293330A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109699208A (en) * | 2019-02-25 | 2019-05-03 | 东北农业大学 | Weeder between a kind of intelligence cutting disc strain |
| CN112075409A (en) * | 2020-10-13 | 2020-12-15 | 河南半夏农业科技有限公司 | Highly-differentiated herbicide smearing machine and weeding method |
| CN113748753A (en) * | 2021-09-30 | 2021-12-07 | 福州大学 | Hoe-shovel type end effector and working method thereof |
| EP4265087A1 (en) * | 2022-04-19 | 2023-10-25 | Feldklasse GmbH | Module for working the soil of a culture, trailer for a tractor and its use |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WW01 | Invention patent application withdrawn after publication | ||
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Application publication date: 20180720 |