Method for determining corn grain hardness

A determination method and grain technology, applied in the direction of testing material hardness, etc., can solve the problems of inability to measure the hardness of wheat, poor comparability of hardness values, and inability to fully apply hardness testing, etc., and achieve fast detection speed, convenient operation, and high hardness resolution. Effect

Inactive Publication Date: 2010-05-26
GANSU AGRI UNIV
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Problems solved by technology

The methods for measuring wheat hardness mainly include cutin rate method, pressure method, grinding method, hardness index method, near-infrared method, etc. The hardness values ​​measured by different methods are not comparable, and these meth

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  • Method for determining corn grain hardness
  • Method for determining corn grain hardness
  • Method for determining corn grain hardness

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Embodiment 1: the mensuration of corn hardness

[0035] (1) Preparation before grain measurement: sample making (taking Gansu Jinsui No. 4 corn kernels as an example)

[0036] Grind the corn kernels with No. 0 or No. 1 sandpaper or a fine-grained file to expose the corresponding parts to be tested to form the surface to be tested, and smooth the other side of the corn kernels to form a base surface. When grinding, try to make the surface to be tested The measuring surface and the base surface are kept parallel. The base surface should be ground as large as possible to ensure the stability of the sample under pressure; the surface to be tested should be ground smaller, as long as the part to be tested can be exposed. The part to be tested has sufficient thickness. On the polished surface to be tested, the color of the embryo of Jinsui No. 4 corn was slightly blue, the horny endosperm was golden yellow, and the floury endosperm was white. The test will measure the hard...

Embodiment 2

[0057] Embodiment 2: Determination of Hardness of Xihan No. 1 Wheat

[0058] (1) Preparation before grain determination:

[0059] Take 20 grains of wheat with a moisture content of 13.01%, and one side with grooves (referring to the ventral groove of wheat) is ground as the base surface, and the other side (the back side of the wheat grains) is lightly ground as the surface to be tested.

[0060] (2) Selection of testing machine: (same as Example 1)

[0061] (3) Selection and clamping of steel needles: (same as Example 1)

[0062] (4) Determination process:

[0063] Before the start of the test, the insertion depth of the steel needle was set at 0.5mm, and the sample gauge length, sample diameter, and loading speed were the same as in Example 1.

[0064] (5) Determination of hardness:

[0065] Measure the hardness of 20 polished wheat grains, and after taking the average value, the hardness value of the back side of the wheat grains is 28.36. The corresponding SKCS hardne...

Embodiment 3

[0071] Embodiment 3: Dingpi No. 1 pea hardness determination (method and steps are the same as above)

[0072] (1) Preparation before grain measurement: (sample preparation)

[0073] Take 20 Dingpia No. 1 peas with a moisture content of 13.2%, and grind out two parallel surfaces one by one as the base surface and the surface to be tested. Note that the surface to be tested should not be perpendicular to the contact surface between the two petals of the pea. Avoid the needle tip sticking to the junction seam of the two petals of the pea, causing measurement errors.

[0074] Step (2)-(4) is identical with example 2

[0075] (5) Determination of hardness:

[0076] After taking the average value of the measurement results of 20 peas, the hardness value of the peas is obtained: 29.50.

[0077] image 3 It is the measurement curve of 5 peas among them, and Table 5 is the corresponding measurement result.

[0078] Table 5 Determination results of pea hardness of Dingying No. 1 ...

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Abstract

The invention relates to a general method for determining corn grain hardness. The method for determining the corn grain hardness is characterized by comprising the following determining steps of: (1) preparation before corn determination; (2) testing machine selection; (3) selection and clamping of a steel needle; (4) determining process; and (5) hardness determination. The invention has the advantages of high hardness resolution, wide application range, convenient operation and high detection speed. The method can determine the hardness of different components of the same corn and the hardness of any different corn grains by using a uniform standard and a method and realize the hardness comparability of different objects determined. The invention can determine the hardness of different positions of the outside and the inside of corn grains and use the general microcomputer universal material testing machine within 500N and the general steel needle as apparatuses without additional special equipment.

Description

technical field [0001] The invention relates to a general method for measuring grain hardness. Background technique [0002] At present, there are many domestic researches and methods for determining the hardness of wheat grains, but there are few methods for determining the hardness of other grains, or even not involved. The methods for measuring wheat hardness mainly include cutin rate method, pressure method, grinding method, hardness index method, near-infrared method, etc. The hardness values ​​measured by different methods are not comparable, and these methods and corresponding testing equipment cannot be fully applied to other For the hardness test of grain kernels, for example, the hardness of corn can be measured by using the domestic JFS grain grinder, but the hardness of wheat cannot be measured. [0003] Brinell hardness and Rockwell hardness test methods use the indentation method to measure the hardness of metals, but these two methods cannot be directly used ...

Claims

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Application Information

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IPC IPC(8): G01N3/40
Inventor 张锋伟赵武云韩正晟郭维俊吴劲锋王关平赵春花冯全戴飞
Owner GANSU AGRI UNIV
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