Spiral conveyor is mainly used for conveying powdery, granular and small lump materials, such as pulverized coal, carbon black, soda ash, reclaimed rubber powder, Zinc Oxide, calcium carbonate and small lump coal. It is not suitable for transporting materials that are perishable, sticky and easy to lump. Compared with other conveying equipment, screw conveyor has the advantages of simple structure, small cross section size, good sealing performance, multiple loading and unloading in the middle, safe and convenient operation, and low manufacturing cost. The suitable environment temperature of the screw conveyor is -20 to 50 C; the material temperature is less than 200 ℃; the inclination of the conveyor is <20 ℃, and the length of the conveyer is generally less than 40m, and the longest not more than 70m.
2.Structure of spiral conveyor
The spiral conveyer is composed of three parts, which are the main body, the inlet & outlet and the driving device. The spiral conveyer body consists of the head bearing, the tail bearing, the suspension bearing, the spiral, the casing and the base. The driving device consists of a motor, a reducer, a coupling and a base. The general drawing of the spiral conveyer is shown in Figure 1.
The spiral blade of the spiral conveyer has the solid face type, the belt face type and the leaf face type. The solid spiral surface is called S method and its spiral pitch is 0.8 times the diameter of the blade. It is suitable for conveying powder and granular materials. The belt spiral surface is also called the D method. The screw pitch is the same as the diameter of the spiral blade. It is suitable for conveying the powder and small pieces of material. The leaf face type is suitable for transporting the material with large viscosity and compressibility, and can also complete the mixing and mixing processes at the same time, with less application. The type of each spiral blade is shown in Figure 2.
Figure2. spiral blade of the spiral conveyer
（a）solid face type；（b）belt face type；（c）leaf face type
4.specification of spiral conveyor
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