Determination of Maize Bulk Density by National Standard Method
According to GB1353-1999 method operation, the sample preparation 1kg sample is divided into two times (about 500g once) into the sieve, after the sieve sieve the lower sieve is mixed in the sieve into the cereal tube, and then the other half (about 500g) is poured into the sieve again, and the sieved material of the lower sieve is mixed in the sieve after being sieved and then poured into the cereal cylinder, filled and scraped flat. The other steps are the same as described in GB1353-1999.
The result is: The result unit is g/L. 1(690), 2(695), 3(687), 4(693), 5(696), 6(690), 7(692), 8(696), 9(693), 10(694), The average is 693. A total of 10 measurements were made.
From the above data, it can be seen that the sample is sieved twice and the sample is mixed on the glass plate after each sieve. It should be said that this step is correct. However, the mixed sample was picked up again in a large container (for example, a large scale sample) and poured into a cereal tube together. The result was the highest, and the results of the 10 measurements were also very different, up to 9 g/L. The surveyor is greatly puzzled. What is the true value of corn? The reason for this is that the test sample for corn bulk density is semi-clean grain, and there are impurities in it. All of the sample after screening is poured into the grain cylinder. When the sample is poured, almost 1kg of the sample all participate in the automatic classification. The large and heavy corn and the uncontaminated impurities first fall into the lower part of the cylinder. The corn forms an invisible grade in the cylinder, and the impurities are small and light. The corn was at the top of the whole cereal barrel. When the insert was inserted, all the impurities in the upper part were removed. As a result, in the approximately 1 kg sample, all the impurities and small and light corn kernels were almost absent, but this was the case. For small corn kernels, the grading situation is not the same between one time and one time, making the average of the measurements the highest, and the error of each result is also greater.
The above analysis uses the national standard method to determine the bulk density of corn. In addition, we can also determine the bulk density through the corn bulkhead. The electronic load cell is based on the “reference standard†in the standard and standard of the “HGT-1000 Grain Cessel Container†by LS/T3701-1993. And GB1353-2009 "maize" new national standard in the measurement of grain bulk density requirements developed. Compared with the national standard method, the determination process is more convenient and simpler, and the measurement results are also more accurate. The container weight is widely used in the measurement of the bulk density of crops such as wheat, rice, sorghum, and corn. Takes a very big position in the detection of grain and oil.
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