调节引风机，使上箱体中床层物料上部保持微负压，维持良好的干燥环境并防止粉尘外泄（略）。
Fan regulation, which box on the bed material to maintain the upper-vacuum, maintain good dry environment and prevent dust leakage.
认为对物料的传热是生产过程中的主要控制因素，由于料层中温度梯度的存在，影响到物料床中不同层次分解的钴粉聚集长大过程。
The results show that the main factor is the heat transferring to the material, the conglomeration and growing of the cobalt powder on different material bed is effected by the temperature gradient.
如果排料不当便会造成床层过厚或排空，都会使已分层的物料混乱，从而影响其分选效果。
If discharging is not appropriate, it will result in the bed layer which is over thick or empty and make the layered material confusion, then it will weakened the separation effect.
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