What impact does the air volume size of the screening machine have on production volume?

The air volume size of the screening machine has a great impact on the production volume and process effect. It should be accurately adjusted according to the characteristics of the raw materials, equipment models and process standards. The actual analysis is as follows:
1. The impact of excessive air
reduces the separation efficiency and
damages the floating state of the raw materials: When there is too much wind, the cyclone penetrates the material layer and destroys the automatic grading state. Gravel and grains with relatively high density may be blown at the same time, resulting in unclear separation and an increase in the stone content in the grain.
The stone discharge port is blocked: gravel cannot settle effectively and may be discharged from the stone discharge port with air, or block the screen, further reducing the separation effect.
Affects production reliability
and reduces processing capacity: Excessive wind causes the surface of the material screen to roll strongly, and is even blown out of the equipment, reducing the actual output.
Increased energy consumption: The centrifugal fan needs more power to maintain a large air volume, but the failed cyclone consumes heat and the energy consumption of the company's production volume increases.
2. The exhaust volume is too small and
the separation effect is poor
. The raw materials are not stratified enough: the exhaust volume is too small to cause floating and semi-floating conditions. The relative density difference is small and the gravel and grain cannot be separated. The stone content in the grain increases.
Risk of screen powder clogging: The raw material layer is too thick and the airflow cannot pass through it. The screen is easily clogged and needs to be shut down frequently for cleaning, which affects continuous production.
The production volume is limited and
the response speed is reduced: the fluidity of raw materials is slow, and the amount of sieved powder materials per unit time is small, resulting in a decrease in output.
The efficiency of the machinery and equipment is not high: under low exhaust air volume, the stone removal machine cannot exert its designed capacity and the resource utilization efficiency is reduced.
3. The adjustment standards for suitable air volume
are based on the characteristic
density and particle size distribution of the items: materials with large relative density differences (such as wheat and gravel) require a larger exhaust volume to form a good grade classification; materials with fine particle size distribution (such as black rice) require a relatively small exhaust volume to prevent blowing through.
Impurity content: Materials containing light impurities (such as chaff) need to adjust the exhaust volume appropriately to remove impurities, but do not blow open the grains excessively.
Equipment model matching
sieve powder specifications: The larger the total width of the sieved powder, the greater the air volume required to maintain even air flow distribution. For example, a destoner with a screen width exceeding 850mm needs to adopt a multi-tube feeding or dual stone zone design.
Fan power: Fan speed and exhaust volume need to match the rated output of the equipment. For example, when dealing with rice, the rated output of the equipment needs to be multiplied by a conversion factor of 0.7-0.8 to compensate for the density difference between rice and wheat.
Dynamically adjust the method
to observe the material condition: judge whether the exhaust air volume is appropriate based on the movement of the material on the screen surface. If the raw material rolls strongly, it means there is too much air; if the raw material is close to the sieve powder, it means the exhaust air volume is too small.
Adjust the air inlet valve and reverse wind: first adjust the total exhaust volume to a suitable range, and then adjust the reverse exhaust volume of the optimization chamber to reduce the grain content in the stone. For example, increasing the exhaust volume in the opposite direction can blow the grains floating on top of the gravel back to the stone gathering area.
Adjustment and reliability: Air volume adjustment needs to be carried out in "small steps" to prevent large fluctuations. When adjusting, ensure that the arc-shaped moving plates on both sides open to the same degree to prevent raw materials from flowing to one side.