CN102620987B - Clamp for crop stem bending test - Google Patents
Clamp for crop stem bending test Download PDFInfo
- Publication number
- CN102620987B CN102620987B CN201210067827.5A CN201210067827A CN102620987B CN 102620987 B CN102620987 B CN 102620987B CN 201210067827 A CN201210067827 A CN 201210067827A CN 102620987 B CN102620987 B CN 102620987B
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- chuck
- clamp
- adjusting screw
- fixed chuck
- fixture
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Abstract
A clamp for crop stem bending test comprises a clamp holder (3) and a fixed chuck with an annular clamping cavity. The fixed chuck comprises a semicircular upper chuck (1) and a lower chuck (2), the bottom of the lower chuck (2) is fixedly connected with the clamp holder (3), and the upper chuck (1) is detachably connected with the lower chuck (2). A pushable arc-shaped inner chuck (4) is arranged in the annular clamping cavity of the clamp, the top of the inner chuck is vertically, upwardly and fixedly connected with a pitch adjusting screw (9), the pitch adjusting screw (9) is connected with a pitch adjusting nut (10) outside the fixed chuck through a hole at the top of the fixed chuck in a threaded manner, and a clamp groove (102) is arranged at the bottom of the pitch adjusting nut (10) and slidably clamped with a clamp ring (103) corresponding to the upper chuck (1). Straw positions with different diameters are fastened by the pushable arc-shaped inner chuck, the contact area of the inner surface of the clamp and surfaces of straws is increased, the pulling resistance of the clamp is improved, and the problem that ends of the straws are squashed is effectively reduced.
Description
Technical field
The present invention relates to the fixture using in the test of crop lodging resistance, relate in particular to a kind of fixture for crop stalk bending test.
Background technology
Lodging is ubiquitous problem in crop production, has become one of critical limitation factor of stable high yield.In high-yield breeding of crops, the lodging resistance that improves crop stem is an important breeding objective., stem high with stem physical strength thick, stem stalk is relevant again for the lodging resistance of stem stalk.Evaluate the important indicator of the physical strength of crop stem and normally test the anti-fall bending property of stem stalk.
Stem stalk semi-girder bending test is that simulation crop stem (as natural conditions such as wind, rain) under horizontal force makes stem stalk crooked, and its test result can reflect crop stem physical strength resistant to lodging more really.But, carry out at present stem stalk semi-girder bending test normally blocks crop by joint after, some joint portions being carried out to Mechanics Performance Testing, in process of the test, the greatest difficulty running into is exactly the design of fixture at present.Cause difficult reason to have following Liang Ge aspect:
1, crop homophyletic differing heights or not homophyletic cane there is different diameters, plain clamp inside surface cannot fully contact with the cane surface of thickness inequality, so cannot be effectively fixing to it.
In 2 bending test processes, plain clamp very easily saves crop stalk portion's conquassation, or while contacting fixedly in cane end with clamp ends hard, by the conquassation of cane end, and cannot Validity Test joint portion stem stalk physical strength resistant to lodging.
Above 2 absolutely prove, plain clamp cannot meet the requirement of cane bending test because of effectively fixing plant stem.Therefore exploitation is applicable to the fixture of crop stem semi-girder bending test, and by the inner link of semi-girder bending test discussion crop stem Mechanical Characters of Composite Ground and mechanical quality, for the seed selection of the anti-fall kind of crop and the foundation of anti-fall evaluation index provide foundation, significant to improving crop yield and quality
Summary of the invention
The deficiency that the present invention exists for fear of prior art, provides a kind of and can regulate and have for different stem stalk diameters the bending test fixture of protection Jie Bujinggan end.By this fixture, can simulate better the force-bearing situation of crop stem in natural weather situation.
Technical solution problem of the present invention adopts following scheme:
A kind of fixture for crop stem bending test, comprise clamp holder and a fixed chuck with annular clamping chamber, its design feature is: described fixed chuck is comprised of semicircular ring upper grip, semicircle annular lower chuck, the lower chuck bottom clamp holder that is connected, described upper grip is fixedly connected with by removable connector with lower chuck; Described fixture is also provided with one can promote chuck in circular arc, described interior chuck is arranged in annular clamping chamber, its top adjusting screw that is connected vertically upward, the hole that described adjusting screw arranges through fixed chuck top is threaded with the adjusting screw nut outside fixed chuck, described adjusting screw nut bottom is provided with draw-in groove, the snap ring slidingtype clamping of described draw-in groove setting corresponding to upper grip.
Design feature of the present invention is also:
On the circular arc shaped inside wall of described interior chuck and the fixed chuck bottom inside wall corresponding with interior chuck, be equipped with rubber blanket.
Described fixture can promote interior chuck along evenly arranging 2-5 on fixed chuck axial direction.
The fixed chuck axial length of described fixture is 75mm-150mm.
Described rubber blanket is that 3mm-5mm silicon rubber pad is made by thickness.
Compared with the prior art, beneficial effect of the present invention is embodied in:
(1) structure of the present invention has overcome the defect that plain clamp inside surface cannot fully contact with the stem stalk surface of homophyletic differing heights thickness inequality, respectively by regulating adjusting screw and adjusting screw nut, drive can promote interior chuck, the stalk position of different-diameter is carried out fastening, stem stalk folder, hold more stable.
(2) to be glued at the rubber blanket that can promote on interior chuck be soft quality of rubber materials in the present invention, not only increased the contact area on fixture inside surface and stalk surface, improved the withdrawal resistance of fixture, also effectively reduced the phenomenon of stalk end conquassation.
(3) structure of the present invention is not only applicable to the crop stalk that homophyletic differing heights has different-diameter, also be applicable to the not crop stem of homophyletic thickness inequality, by the adjusting of distance between upper grip, lower chuck and the adjusting of adjusting screw and adjusting screw nut, structure of the present invention has the larger stem stalk diameter scope of application.
Figure of description
Fig. 1 is the cross-sectional view of invention fixture.
Fig. 2 is the longitudinal diagram of fixture of the present invention.
Fig. 3 is the use state cross-sectional view of fixture clamping major diameter crop material of the present invention.
Fig. 4 is the use state cross-sectional view that fixture of the present invention clamps little crop material.
Fig. 5 is fixture stereographic map of the present invention.
Fig. 5 a is originally invention fixture upper grip position stereographic map.
Fig. 5 b is fixture lower chuck of the present invention position stereographic map.
Fig. 5 c is the annexation structural representation between fixture upper grip of the present invention and adjusting screw(rod), nut.
Fig. 6 a is the stereographic map of fixture clamping major diameter crop material of the present invention.
Fig. 6 b is the stereographic map of fixture clamping minor diameter crop material of the present invention.
Fig. 7 is that fixture of the present invention and mechanical test machine are used in conjunction with constitutional diagram.
Number in the figure: it is pressure head that 1 upper grip, 2 lower chucks, 3 clamp holders, 4 can promote interior chuck, 5 rubber blankets, 6 chuck fixed orifices, 7 chuck hold-down nuts, 8 chuck standing screws, 81 chuck standing screw heads, 9 adjusting screw(rod)s, 10 setting nuts, 11, major diameter crop material, 12 minor diameter crop materials, 13,15 is pressure testing machine lower beam, 16 is slide block, 101 is the threaded area of setting nut, 102 is the draw-in groove of setting nut, and 103 is snap ring.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
As shown in the figure, fixture, comprise clamp holder 3 and a fixed chuck with annular clamping chamber, fixed chuck is comprised of semicircular ring upper grip 1, semicircle annular lower chuck 2, the lower chuck 2 bottoms clamp holder 3 that is connected, upper grip 1 and lower chuck 2 both sides are provided with tape punching 6 engaging lugs 7, and upper grip 1 and lower chuck 2, by chuck fixed orifice 6 bolted, also can be fixedly connected with by other modes of removably connecting.
Fixture is also provided with one can promote chuck 4 in circular arc, interior chuck 4 is arranged in annular clamping chamber, its top adjusting screw 9 that is connected vertically upward, the hole that adjusting screw 9 arranges through fixed chuck top is threaded with the adjusting screw nut 10 outside fixed chuck, adjusting screw nut 10 is provided with the draw-in groove 102 that threaded area 101 and bottom arrange, the rotatable slidingtype clamping of snap ring 103 of draw-in groove 102 and the corresponding setting of upper grip 1.
On the circular arc shaped inside wall of interior chuck and the fixed chuck bottom inside wall corresponding with interior chuck, be equipped with rubber blanket 5.
The fixed chuck axial length of the present embodiment fixture is 75mm-150mm.Fixture can promote interior chuck 4 along evenly arranging 2-5 on fixed chuck axial direction.The thickness of rubber blanket 5 is 3mm-5mm.Rubber blanket is silicon rubber pad, both can be anti-skidding, and fastening stem stalk, has again certain elasticity better, can prevent that crop stem is by conquassation.
While carrying out the performance test of crop material mechanics of bending,
First stalk is put into the annular clamping chamber between upper grip 1 and lower chuck 2, on the rubber blanket 5 of upper and lower chuck;
Second step, according to the diameter of stem stalk, by the chuck fixed orifice 6 on upper grip 1 and lower chuck 2 both sides engaging lugs, utilizes chuck hold-down nut 7 and chuck standing screw 8 and the fastening upper lower chuck of chuck standing screw head 81;
The 3rd step, screws 2-5 setting nut 10 on upper grip 1, by adjusting screw(rod) 9, promotes to promote interior chuck 4 and rubber blanket 5, the different diameter parts of stem stalk in further fastening annular clamping chamber;
The 4th step, is positioned over the fixture of fastening good stalk in pressure testing machine lower beam 14, regulates stem stalk and pressure head 13 position, and utilizes the slide block 15 in pressure testing machine lower beam 14 that the handle of fixture (3) is anchored on pressure testing machine;
The 5th step, the mechanics of bending performance test of stem stalk.
Claims (1)
1. the fixture for crop stem bending test, comprise clamp holder (3) and a fixed chuck with annular clamping chamber, it is characterized in that: described fixed chuck is comprised of semicircular ring upper grip (1), semicircle annular lower chuck (2), the axial length of fixed chuck is 75mm-150mm, described lower chuck (2) the bottom clamp holder (3) that is connected, described upper grip (1) is fixedly connected with by removable connector with lower chuck (2); Described fixture can promote interior chuck (4) along evenly arranging 2-5 on fixed chuck axial direction, described interior chuck (4) is arranged in annular clamping chamber, its top adjusting screw (9) that is connected vertically upward, the hole that described adjusting screw (9) arranges through fixed chuck top is threaded with the adjusting screw nut (10) outside fixed chuck, described adjusting screw nut (10) bottom is provided with draw-in groove (102), snap ring (103) the slidingtype clamping of described draw-in groove and the corresponding setting of upper grip (1); On the circular arc shaped inside wall of described interior chuck and the fixed chuck bottom inside wall corresponding with interior chuck, be equipped with rubber blanket (5); Described rubber blanket (5) is that 3mm-5mm silicon rubber pad is made by thickness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210067827.5A CN102620987B (en) | 2012-03-14 | 2012-03-14 | Clamp for crop stem bending test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210067827.5A CN102620987B (en) | 2012-03-14 | 2012-03-14 | Clamp for crop stem bending test |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102620987A CN102620987A (en) | 2012-08-01 |
| CN102620987B true CN102620987B (en) | 2014-01-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210067827.5A Expired - Fee Related CN102620987B (en) | 2012-03-14 | 2012-03-14 | Clamp for crop stem bending test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102620987B (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103033424A (en) * | 2013-01-10 | 2013-04-10 | 东北农业大学 | Device for detecting bending resistance of rice stalk |
| CN103245556B (en) * | 2013-05-07 | 2016-04-06 | 上海交通大学 | Plow-steel cylindrical element bending strength test device |
| CN103344494B (en) * | 2013-07-16 | 2015-06-24 | 中国农业大学 | Straw stretching property test device |
| CN105445096A (en) * | 2014-09-23 | 2016-03-30 | 振石集团恒石纤维基业有限公司 | Testing clamp and method for improving mechanical fatigue performance of composite material |
| CN104634552B (en) * | 2014-11-28 | 2017-06-09 | 安徽江淮汽车集团股份有限公司 | Back-up ring compressive strength test frock and test method |
| CN104596843A (en) * | 2015-01-16 | 2015-05-06 | 福建工程学院 | Special fixture for shearing substitution test of rubber material |
| CN106053224B (en) * | 2016-06-27 | 2018-10-19 | 农业部南京农业机械化研究所 | It is compressed axially mechanics testing machine |
| CN109342083B (en) * | 2018-11-08 | 2024-03-22 | 深圳市检验检疫科学研究院 | Fixing method and fixture for testing safety performance of double-wheel electric balance car |
| CN109596419B (en) * | 2019-01-30 | 2021-03-23 | 湖南农业大学 | Crop stem stalk cuts quick clamping device of experimental stem stalk that uses |
| CN110160954B (en) * | 2019-06-12 | 2024-02-27 | 辽宁科技大学 | Device and method for measuring friction force between plant single element and soil |
| CN110686984B (en) * | 2019-09-23 | 2021-11-05 | 南京航空航天大学 | Bending load test loading device and loading method for self-sealing type release joint |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU819616A1 (en) * | 1976-01-06 | 1981-04-07 | Ленинградский Ордена Ленинаэлектротехнический Институт Им.B.И.Ульянова (Ленина) | Plant for fatigue testing in bending |
| CN101216389A (en) * | 2007-12-27 | 2008-07-09 | 江苏大学 | Agricultural material dynamic characteristic test apparatus and method |
| CN201535738U (en) * | 2009-09-22 | 2010-07-28 | 国际竹藤网络中心 | Clamp for measuring tensile mechanical performance of plant fibre |
| CN101718600B (en) * | 2009-11-23 | 2011-06-08 | 中国农业大学 | Method and special detector for detecting vertical uprooting resistance value of plants |
| CN101923022B (en) * | 2010-07-23 | 2012-04-25 | 北京农业智能装备技术研究中心 | Hand-held device and method for measuring lodging-resistant strength of crop |
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2012
- 2012-03-14 CN CN201210067827.5A patent/CN102620987B/en not_active Expired - Fee Related
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| Publication number | Publication date |
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| CN102620987A (en) | 2012-08-01 |
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| C06 | Publication | ||
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Chen Yuxia Inventor after: Xiang Yan Inventor after: Guo Yong Inventor after: He Hongsheng Inventor before: Guo Yong Inventor before: Xiang Yan Inventor before: Chen Yuxia Inventor before: He Hongsheng |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: GUO YONG XIANG YAN CHEN YUXIA HE HONGSHENG TO: CHEN YUXIA XIANG YAN GUO YONG HE HONGSHENG |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140115 Termination date: 20200314 |
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| CF01 | Termination of patent right due to non-payment of annual fee |