CN106576947A - Artificial assistance handheld bar and pawl variable-diameter branch clamping orange tree girdling device - Google Patents
Artificial assistance handheld bar and pawl variable-diameter branch clamping orange tree girdling device Download PDFInfo
- Publication number
- CN106576947A CN106576947A CN201710108766.5A CN201710108766A CN106576947A CN 106576947 A CN106576947 A CN 106576947A CN 201710108766 A CN201710108766 A CN 201710108766A CN 106576947 A CN106576947 A CN 106576947A
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- China
- Prior art keywords
- handle
- circle
- ratchet
- spring
- band girdle
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Classifications
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
Abstract
The invention provides an artificial assistance handheld bar and pawl variable-diameter branch clamping orange tree girdling device. The girdling device comprises a handle, a spring, a rotary shaft, a moving ring, a fixed ring, a ratchet bar and a ratchet pawl. A tension spring is used as the spring. During operating, the ratchet pawl is engaged with ratchets to fix the moving ring to an orange tree branch to prevent the moving ring from rotating along with a girdling knife. The handle is divided into two parts. The fixed ring is mounted on the handle. Two parts of the fixed ring are buckled together to form a full circle. The handle is opened and closed, and the fixed ring is also opened and closed accordingly. The fixed ring is provided with grooves. Rolling wheels are embedded into the grooves and roll in the grooves. A link rod penetrates through center holes of the rolling wheels. The rolling wheels rotate circumferentially. The link rod connects two orange tree girdling devices together. A girdling handle is fixed to the link rod. One end of the girdling handle is provided with the girdling knife. The other end of the girdling handle is provided with a yoke plate. Under artificial assistance, the girdling knife does circular movement to conduct girdling on an orange tree with the fixed point of the handle and the link rod as the circle center and with the distance from the fixed point to the knife point of the girdling knife as the radius.
Description
Technical field
The present invention relates to a kind of manual power assisting hand-held spine bar ratchet reducing branch clamps mandarin orange girdling device, belong to mechanical skill
Art is led.
Background technology
Mandarin orange band girdle it can replace hormone fruit retention, prevent swash Suo Baoguo cause fruit and it is coarse, peel is thickened, and local flavor is thin out
Ill effect, you can repeatedly smear summer shoot to cause autumn growth cluster to be given birth to to save control shoot cost, to overcome, weak branch increases, autumn growth result
Female branch Quality Down, causes how young result or fruitless vicious cycle, and mandarin orange band girdle is the growth for suppressing the spring tip and summer shoot,
Band girdle hinders photosynthetic downward conveying, makes the root system of mandarin orange cannot get the supply of nutrient, suppresses nutrient growth, promote bud
Differentiation, improves percentage of fertile fruit, promotes Fruit, improve quality, the band girdle of mandarin orange to carry out in full-bloom stage, and summer band girdle changes size
Year, using interval band girdle, the growth angle of each side shoot is not only identical, and the spacing between side shoot is little, and the radius of gyration is little, sends out for side shoot
The motor that bright patent 201410485285.2 is driven using gasoline engine, volume are larger, and the radius of gyration is big, the angle of inclination of Girding cutter
Realization is rotated around the shaft by rotary oil cylinder telescopic band moving platform, can only realize that a face rotation is inclined, it is impossible to realize that space is multiple
Rotation while face is inclined, and use range has significant limitation, is suitable only for the trunk band girdle of mandarin orange, additionally, the ring of mandarin orange
, at 1.0～5.0 centimetres, at 0.2～0.5 centimetre, otch is concordant, bast for notch depth scope for the kerf width scope of stripping branch
More wood fibre is contained in portion, and at the band girdle during band girdle, the phloem closed at band girdle is torn Girding cutter by no clamping device
Split, cause band girdle area excessive, at the band girdle of mandarin orange, be difficult healing, nutrient conveying is obstructed, and affects growth and the percentage of fertile fruit of mandarin orange.
The content of the invention
A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps mandarin orange girdling device, the through hole that spine bar is arranged in fixed circle
Interior motion, rotates ratchet, makes ratchet depart from ratchet, pulls spine bar, makes the clamping face of circle tight with the outer surface of orange branches
Contact, rotates ratchet, makes the active force of ratchet and ratchet engagement, spring prevent pawl rotation, meanwhile, the external force on handle is moved
Remove, the branch of mandarin orange is clamped, can realize that reducing is clamped, only to the mandarin orange phloem band girdle in clamping, will not produce to band girdle
Phloem beyond position produces tear, and the radius of gyration is little, is adapted to the band girdle of the orange branches of differing tilt angles, compact side
Just flexibly, efficiency high, strong adaptability, periphery of the support wheel arranged on band girdle handle at mandarin orange band girdle branch are rolled, and are risen and are propped up
Support is acted on, and makes the band girdle angle of Girding cutter constant, arranges spring with link rod fixed point in band girdle handle, to what is arranged on band girdle handle
Girding cutter applies constant pressure, in case Girding cutter is beated in band girdle, it is ensured that ring-peeling depth is consistent.
Its technical scheme is：A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps mandarin orange girdling device, including handss
Handle, spring, rotating shaft, dynamic circle, fixed circle, spine bar and ratchet, fixedly mount spring on handle, and spring is extension spring, and handle is divided into two
Part, on handle, fixed circle is divided into two parts to fixed circle, and two parts of fixed circle snap together into a full circle, handle
Opening and closing, determine the servo-actuated opening and closing of fenestra, and fixed circle is provided with groove, rolls in the embedded groove of roller and in a groove,
Centre bore of the link rod through roller, roller do circular-rotation in a groove, and two mandarin orange girdling devices are linked together by link rod, ring
Stripping handle be fixed on link rod, one end of band girdle handle is provided with Girding cutter, and the other end is provided with yoke plate, under manual power assisting, Girding cutter with
Band girdle handle is the center of circle with link rod fixing point, and being circled as radius with fixing point to the point of a knife of Girding cutter carries out ring to mandarin orange
Stripping, is fixed due to the center of circle, radius determines, the movement locus of Girding cutter are the circles of the closing that overlaps, width range 1.0～
Between 5.0 centimetres, the diameter of the branch of mandarin orange is approximately considered uniformity, and the non-centering of manual other forms, non-fixed half
The girdling device in footpath, movement locus are broken line, it is impossible to form the circle of closing, and spine bar one end is coupled with fixed circle, and the other end and dynamic circle join
Connect, dynamic circle is divided into two parts, the clamping face for moving circle is provided with rough groove, and spine bar is provided with ratchet, and spine bar runs through
The through hole arranged on fixed circle, and move back and forth in through hole, realize that reducing is pressed from both sides as the orange branches diameter of clamping is continually changing
Hold, ratchet is provided with through hole, through hole and spring of the bearing pin on ratchet are coupled with the yoke plate for determining to arrange on circle, and ratchet is in through hole
Interior rotation, spring is torsion spring, and handle is divided into two parts, and handle is provided with rotating shaft, and two parts of handle are connected in one by rotating shaft
Rise, under the action of the spring, handle two parts closure, in the presence of external force, overcomes the pulling force that spring is fixedly mounted on handle,
Two parts of handle reversely rotate around the axis, and justify surely two parts and open, be moved at the orange branches of band girdle, rotate ratchet, spine
Pawl departs from ratchet, pulls spine bar, the clamping face of circle is in close contact with the outer surface of orange branches, it is impossible to rotate, rotate spine
Pawl, ratchet and ratchet engagement, the active force of spring prevent pawl rotation, meanwhile, the external force on handle is removed, by orange branches
Clamp, under the pulling force effect of the spring arranged on handle, two parts of fixed circle snap together into a full circle.
A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps mandarin orange girdling device, can adapt to differing tilt angles
Orange branches clamping, small volume, lightweight, easy to operate, band girdle efficiency high, handle are short, and the radius of gyration is little, and invent special
Profit 201410485285.2 adopts gasoline engine drive motor, motor driven gear, volume are big, and the radius of gyration is big, and Girding cutter inclines
Rake angle rotates realization around the shaft by rotary oil cylinder telescopic band moving platform, can only realize that a face rotation is inclined, it is impossible to realize empty
Between multiple faces while rotate, the radius of gyration is big, is only applicable to the trunk band girdle of mandarin orange, the lifting of oil cylinder, it is impossible to adjustment space
On angle of inclination, secondly bad adaptability, without dynamic circle clamping, easily by the mandarin orange phloem tear beyond at band girdle, makes band girdle face
Product is excessive, the healing of the wound of impact mandarin orange, and impact nutrient conveying, percentage of fertile fruit are reduced, and again, installs, adjusts, dismantling not side
Just.
A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps mandarin orange girdling device, and band girdle handle is provided with fulcrum, i.e.,
Band girdle handle and link rod fixed point, power is acted on band girdle handle, is also a kind of lever, can both apply pulling force to band girdle handle,
Pressure can be applied, the ring-peeling depth of Girding cutter can be adjusted, the growth year of orange branches is different, and the depth of band girdle is different,
Band girdle mandarin orange phloem during band girdle, it is impossible to band girdle xylem, damages xylem, affects the conduction of moisture, causes the mandarin orange can not
Absorb moisture and dead, apply pressure and can change the ring-peeling depth of Girding cutter, and 201410485285.2 machinery of patent of invention is firm
Property connection, need to carry out multi-change speed, slow down, complex structure, not with automatic regulation function, band girdle is on request only to phloem
Band girdle, does not damage cambium layer and xylem, the kerf width scope of mandarin orange band girdle branch between 1.0～5.0 centimetres, otch depth
Degree scope strictly press band girdle width and the spiral band girdle of depth standards enforcement between 0.2～0.5 centimetre.
A kind of described manual power assisting hand-held spine bar ratchet reducing branch clamping mandarin orange girdling device, it is solid with link rod in handle
Spring is set at fixed point, and spring is torsion spring, the Girding cutter to arranging on handle applies constant pressure, in case Girding cutter is in band girdle
When beat, ring-peeling depth is consistent, it is ensured that band girdle quality, and Girding cutter adopts drum structure, and the upright blade at two ends is by mandarin orange bast
Portion along the circumferential direction cuts off, while the annulus that the phloem of mandarin orange cuts off is carried out band girdle by the horizontal knife of centre.
A kind of described manual power assisting hand-held spine bar ratchet reducing branch clamping mandarin orange girdling device, band girdle handle are provided with connection
Plate, yoke plate are provided with manhole, and bar one end is connected with support wheel, and the circle that the other end is arranged on spring with yoke plate is led to
Hole connects, and the surface scrolls of orange branches of the support wheel at band girdle during band girdle, support wheel have position-limiting action, and support wheel makes ring
Broach operates steadily, and spring has the function of supporting with profiling.
The present invention has advantages below.
1st, small volume, lightweight, the radius of gyration is little, adapts to the different band girdles for inclining larger orange branches, easy to operate.
2nd, ring-peeling depth is controllable by handle, will not tear the phloem of the other positions beyond band girdle, mandarin orange not made
Into damage.
3rd, the kerf width scope of mandarin orange band girdle branch is between 1.0～5.0 centimetres, and notch depth scope is 0.2～0.5
Centimetre, it is controllable in critical field.
4th, determine annulus stripping, point of a knife of the fixed circle with fixing point to Girding cutter is circled as radius and band girdle carried out to mandarin orange,
Fixed due to the center of circle, radius determines that Girding cutter in width range in 1.0～5.0 centimetres, approximately recognize by the diameter of the branch of mandarin orange
For uniformity, ratchet and ratchet engagement are fixed on dynamic circle on the branch of mandarin orange and can realize that reducing is clamped.
Description of the drawings
Fig. 1 is the structural representation of the girdling device of the embodiment of the present invention.
Fig. 2 is the structural representation of the girdling device job state of the embodiment of the present invention.
1, handle 2 wherein in figure, spring 3, rotating shaft 4, justify surely 5, dynamic circle 6, band girdle handle 7, roller 8,
Support wheel 9, orange branches 10, Girding cutter 11, ratchet 12, ratchet.
Specific embodiment
Embodiment 1.
In the embodiment as shown in Fig. 1～2, a kind of manual power assisting hand-held spine bar ratchet reducing branch clamps mandarin orange ring
Stripping device, including handle 1, spring 2, rotating shaft 3, dynamic circle 5, surely round 4, spine bar and ratchet 12, fixedly mount spring 2, bullet on handle 1
Spring 2 is extension spring, and 1 point of handle is two parts, justifies surely 4 and is arranged on handle 1, justify surely 4 and be divided into two parts, justifies surely 4 two parts
A full circle is snapped together into, 1 opening and closing of handle are justified surely 4 and are also servo-actuated opening and closing, justify surely 4 and be provided with groove, roll
Roll in 7 embedded groove of wheel and in a groove, move in a circle, centre bore of the link rod through roller 7, by two mandarin orange girdling devices
Link together, band girdle handle 6 is fixed on link rod, one end of band girdle handle 6 is provided with Girding cutter 10, and the other end is provided with yoke plate, in people
Under work power-assisted, Girding cutter 10 is made to the point of a knife of Girding cutter 10 as radius with band girdle handle 6 and link rod fixing point as the center of circle with fixing point
Circular motion carries out band girdle to mandarin orange, is fixed due to the center of circle, radius determines, the movement locus of Girding cutter are the closings that overlaps
Circle, 3.0 centimetres of the width of band girdle, 0.5 centimetre of notch depth, the diameter of the branch of mandarin orange are approximately considered uniformity, spine bar one
End with determine circle 4 and couple, the other end is coupled with dynamic circle 5, and spine bar is provided with ratchet 11, spine bar through justifying surely the through hole that arranges on 4, and
Move back and forth in through hole, realize that reducing is clamped as 9 diameter of orange branches of clamping is continually changing, ratchet 12 is provided with logical
Hole, through hole and spring 2 of the bearing pin on ratchet 12 are coupled with the yoke plate for determining to arrange on circle 4, and ratchet 12 is rotated in through hole, bullet
Spring 2 is torsion spring, and handle 1 is divided into two parts, and handle 1 is provided with rotating shaft 3, and two parts of handle 1 are linked together by rotating shaft 3,
In the presence of spring 2,1 two parts of handle closure, in the presence of external force, overcomes the drawing that spring 2 is fixedly mounted on handle 1
Power, two parts of handle 1 reversely 3 are rotated around the shaft, are justified surely 4 two parts and are opened, be moved at the orange branches 9 of band girdle, rotate
Ratchet 12, ratchet 12 depart from ratchet 11, pull spine bar, the clamping face of circle 5 is in close contact with the outer surface of orange branches 9,
Ratchet 12 is rotated, ratchet 12 is engaged with ratchet 11, and the active force of spring 2 prevents ratchet 12 from rotating, meanwhile, will be outer on handle 1
Power is removed, and orange branches 9 are clamped, and under the pulling force effect of the spring 2 arranged on handle 1, the two parts for justifying surely 4 are fastened on one
A full circle is played into, spring 2 is set in band girdle handle 6 and link rod fixed point, spring 2 is torsion spring, to the ring arranged on band girdle handle 6
Broach 10 applies constant pressure, in case Girding cutter 10 is beated in band girdle, Girding cutter 10 adopts drum structure, two ends it is upright
Mandarin orange phloem is along the circumferential direction cut off by blade, while the annulus that the phloem of mandarin orange cuts off is carried out by the horizontal knife of centre
Band girdle, band girdle handle 6 are provided with yoke plate, and yoke plate is provided with manhole, and bar one end is connected with support wheel 8, and the other end runs through bullet
Spring 2 is connected with the manhole arranged on yoke plate, the surface scrolls of the orange branches 9 at the band girdle of support wheel 8, spring 2 during band girdle
With the function of supporting with profiling, active force is applied to band girdle handle 6, drive roller 7 to rotate, and then drive Girding cutter 10 to do circumference
Motion, carries out spiral ring-barking to mandarin orange, moves the clamping action of circle 5, will not be to the bast of the other positions beyond mandarin orange band girdle area
Portion causes to damage, and band girdle efficiency high is easy to operate, after band girdle completes a position, applies external force to handle 1, and handle 1 is around the shaft
3 rotations, the clamping face for moving circle 5 depart from orange branches 9, will remove at orange branches 9 of the mandarin orange girdling device from band girdle after complete,
Then move to, at the orange branches 9 that another needs band girdle, be repeated in the above-mentioned course of work.
The above, is only presently preferred embodiments of the present invention, is not the restriction for making other forms to the present invention, is appointed
What those skilled in the art possibly also with the disclosure above technology contents changed or be modified as equivalent variations etc.
Effect embodiment, it is every without departing from technical solution of the present invention content, above example is made according to the technical spirit of type of the present invention
Any simple modification, equivalent variations and remodeling, still fall within the protection domain of type technical scheme of the present invention.
Claims (3)
1. a kind of manual power assisting hand-held spine bar ratchet reducing branch clamps mandarin orange girdling device, including handle（1）, spring（2）, turn
Axle（3）, dynamic circle（5）, fixed circle（4）, spine bar and ratchet（12）, it is characterised in that：In handle（1）Upper fixed installation spring（2）, bullet
Spring（2）For extension spring, handle（1）Two parts are divided into, fixed circle（4）Installed in handle（1）On, fixed circle（4）Two parts are divided into, it is fixed
Circle（4）Two parts snap together into a full circle, determining circle（4）It is provided with groove, roller（7）In embedded groove and recessed
Roll in groove, link rod runs through roller（7）Centre bore, two mandarin orange girdling devices are linked together, band girdle handle（6）It is fixed on connection
On bar, band girdle handle（6）One end be provided with Girding cutter（10）, the other end is provided with yoke plate, under manual power assisting, Girding cutter（10）With ring
Stripping handle（6）It is the center of circle with link rod fixing point, with fixing point to Girding cutter（10）Point of a knife circle to enter mandarin orange for radius
Row band girdle, spine bar one end with determine circle（4）Connection, the other end and dynamic circle（5）Connection, moves circle（5）Two parts are divided into, circle is moved（5）
Clamping face be provided with rough groove, spine bar is provided with ratchet（11）, spine bar is through fixed circle（4）The through hole of upper setting,
And move back and forth in through hole, with the orange branches of clamping（9）Diameter is continually changing realizes that reducing is clamped, ratchet（12）On set
There is through hole, bearing pin runs through ratchet（12）On through hole and spring（2）With determine circle（4）The yoke plate connection of upper setting, ratchet（12）
Rotate in through hole, spring（2）For torsion spring, handle（1）It is divided into two parts, handle（1）It is provided with rotating shaft（3）, rotating shaft（3）By handss
Handle（1）Two parts be linked together, in spring（2）In the presence of, handle（1）Two parts are closed, in the presence of external force, gram
Take handle（1）Upper fixed installation spring（2）Pulling force, handle（1）Two parts reversely around the shaft（3）Rotate, fixed circle（4）Two
Say good-bye out, be moved to the orange branches of band girdle（9）Place, rotates ratchet（12）, make ratchet（12）Depart from ratchet（11）, pull spine
Bar, makes circle（5）Clamping face and orange branches（9）Outer surface be in close contact, rotate ratchet（12）, ratchet（12）With ratchet
（11）Engagement, spring（2）Active force prevent ratchet（12）Rotate, meanwhile, by handle（1）On external force remove, by mandarin orange branch
Bar（9）Clamp, in handle（1）The spring of upper setting（2）Pulling force effect under, fixed circle（4）Two parts snap together into one
Individual full circle.
2. a kind of manual power assisting hand-held spine bar ratchet reducing branch as described in claim 1 clamps mandarin orange girdling device, and which is special
Levy and be：In band girdle handle（6）Spring is set with link rod fixed point（2）, spring（2）For torsion spring, to band girdle handle（6）Upper setting
Girding cutter（10）Apply constant pressure, in case Girding cutter（10）Beat in band girdle, Girding cutter（10）Using drum structure, two
Mandarin orange phloem is along the circumferential direction cut off by the upright blade at end, while what the phloem of mandarin orange was cut off by the horizontal knife of centre
Annulus carries out band girdle.
3. a kind of manual power assisting hand-held spine bar ratchet reducing branch as described in claim 1 clamps mandarin orange girdling device, and which is special
Levy and be：Band girdle handle（6）Yoke plate is provided with, yoke plate is provided with manhole, bar one end and support wheel（8）Connection, the other end
Through spring（2）It is connected with the manhole arranged on yoke plate, support wheel during band girdle（8）The orange branches at the band girdle（9）Table
Face rolls, spring（2）With the function of supporting with profiling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710108766.5A CN106576947A (en) | 2017-02-27 | 2017-02-27 | Artificial assistance handheld bar and pawl variable-diameter branch clamping orange tree girdling device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710108766.5A CN106576947A (en) | 2017-02-27 | 2017-02-27 | Artificial assistance handheld bar and pawl variable-diameter branch clamping orange tree girdling device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106576947A true CN106576947A (en) | 2017-04-26 |
Family
ID=58587977
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710108766.5A Pending CN106576947A (en) | 2017-02-27 | 2017-02-27 | Artificial assistance handheld bar and pawl variable-diameter branch clamping orange tree girdling device |
Country Status (1)
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| CN (1) | CN106576947A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106688634A (en) * | 2017-02-27 | 2017-05-24 | 山东理工大学 | Artificial auxiliary handheld winter jujube tree girdling machine capable of clamping branch in variable-diameter manner by using ratchet strip and pawl |
| CN106718123A (en) * | 2017-02-27 | 2017-05-31 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps bergamot pear girdling device |
| CN106718144A (en) * | 2017-02-27 | 2017-05-31 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps longan girdling device |
| CN106857022A (en) * | 2017-02-27 | 2017-06-20 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps teak girdling device |
| CN106900364A (en) * | 2017-02-27 | 2017-06-30 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps lichee girdling device |
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| CN106718123A (en) * | 2017-02-27 | 2017-05-31 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps bergamot pear girdling device |
| CN106718144A (en) * | 2017-02-27 | 2017-05-31 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps longan girdling device |
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| CN106888827A (en) * | 2017-02-27 | 2017-06-27 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps grape girdling device |
| CN106900368A (en) * | 2017-02-27 | 2017-06-30 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps persimmon girdling device |
| CN106900364A (en) * | 2017-02-27 | 2017-06-30 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps lichee girdling device |
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| CN106718144A (en) * | 2017-02-27 | 2017-05-31 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps longan girdling device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106688634A (en) * | 2017-02-27 | 2017-05-24 | 山东理工大学 | Artificial auxiliary handheld winter jujube tree girdling machine capable of clamping branch in variable-diameter manner by using ratchet strip and pawl |
| CN106718123A (en) * | 2017-02-27 | 2017-05-31 | 山东理工大学 | A kind of manual power assisting hand-held spine bar ratchet reducing branch clamps bergamot pear girdling device |
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