Circular powder screening is the most ideal testing equipment for determining the fineness of powders. The following is a description of the relevant knowledge about the operation methods and calculation methods of circular powder screening collected and compiled by Agricultural Instrument Network Xiaobian.
The circular powder sieve is suitable for the detection of the processing precision of flour, starch, rice flour, compound feed and other powder materials. It can also be used to inspect whether the sieves and screens of these processing plants are damaged. It is a food production, processing, acquisition and quality inspection. In the work, one of the most important instruments, the operation method of the circular powder sieve is as follows:
1. Firstly, the circular powder screening screen should be placed on a solid and firm test bench or tabletop. If the experiment bench or the table top is uneven, it can easily cause the powder screening screen to vibrate.
2. Select the sieve grid according to the sieve number specified in the quality standard. Test flour is usually CB42, CB36, CB30, CQ27, CQ20, CQ16, CQ10. Starch and rice flour are tested with 80 mesh and 100 mesh sieves or standard textile screens; 4, 6, 8, 12, 16 are used for testing compound feeds. The standard textile screen.
3. Put 5 rubber balls in each layer of sieve, then press big hole sieve on top, small hole sieve on bottom, the bottom is the bottom of sieve, the top is the order of sieve lid installed (only 7 sieves can be placed at a time) ).
4, from the average sample taken from the sample 50g (accurate to 0.1g) (test flour, starch and rice flour when the sampling amount of 50g, when the test sample when the test is 100g) into the amount of upper sieve, hanging pressure Compact structure (should pay attention to both sides of the same degree of compaction).
5, adjust the timer timer for 10 minutes (press the timer on the "+" "-" button to adjust to 10min)
6, start the power switch, powder screening automatically at 260r/min continuous speed after 10min stop, then press the switch again to cut off the power, and make the time controller reset;
After the completion of the screening work of the circular powder sieve, the calculation accuracy and thickness of the food or feed should be calculated. The calculation method for the circular powder sieve is:
The result is calculated as follows: The thickness and fineness are represented by the mass fraction of the powder remaining on the specified sieve layer, and are calculated according to the following two formulas:
Where: X1-- sample thickness (in mass fraction), (%);
M2 upper sieve residue mass in g (g);
X2-- specifies the sum of the mass of residue on the sieve layer, in grams (g);
M-sample mass in grams (g).
The allowable difference between the results of the double test is not more than 0.5%, and the average value is the measurement result. Calculate the result of the measurement and keep one decimal place.
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