The screw conveyor is composed of a closed trough box and a screw of a driving device. The coal in the trough box is pushed out by the screw rotation. The characteristics of the screw conveyor are: simple structure, small cross-sectional size, good sealing, reliable operation, low manufacturing cost, convenient intermediate loading and unloading, reversible conveying direction, and simultaneous conveying in two opposite directions. During the conveying process, the material can also be stirred, mixed, heated and cooled. The material flow rate can be adjusted through the loading and unloading gate. However, it is not suitable to convey perishable, sticky, easy to agglomerate and bulky materials. During the conveying process, the material is easy to break, and the screw and trough are easy to wear. The unit power is relatively large. During use, the sealing of the trough and the appropriate gap between the screw and the trough must be maintained.
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