Description of Spiral Conveyor 
Xinguang spiral conveyor or screw conveyor is a mechanism that uses a rotating helical screw blade, usually within a box or a tube, to move granular materials. Spiral conveyor usually consist of a trough or tube containing either a spiral blade coiled around a shaft, driven at one end and held at the other, or a centreless screw, driven at one end and free at the other. 

Features of Spiral Conveyor  
Large capacity, safe and reliable performance. 
Good adaptability, easy installation and maintenance, long service life. 
Small in size, high rotation speed to ensure rapid and uniform delivery. 
There is cleaning device in the discharge end, low noise, flexible adjustment of the material inlet and outlet. 
Good sealing, the shell is made of seamless steel pipe, the end is connected integrally by flange, good rigidity. 

See more at 
http://www.xgdryer.com/Product/Ore_Dressing_Equipment/Spiral_Conveyor.html  
Email: lola@xgcrusher.com