Screw Conveyor Corporation 700 Hoffman Street Hammond Indiana 46327-1894 Phone: (219) 931-1450 Fax: (219) 931-0209
Inclined and Vertical Screw Conveyors 118 Discussion of capacity versus angle of incline and other factors concerning inclined screw conveyors including horsepower. Description of vertical screw conveyors their speeds capacities components and horsepowers required.
sCReW COnVeYOR CaPaCITY Capacity is defined as the weight or volume per hour of a bulk material that can be safely and feasibly conveyed using a screw conveyor . Screw conveyor diameter is determined by multiple factors including capacity . The following steps are required for proper screw conveyor selection – 1 .
The initial step in engineering a Screw Conveyor is to analyze the physical characteristics of the material and the rate at which it is to be handled. The capacity of a Screw Conveyor should be defined in terms of cubic feet per hour. It is also important to determine the maximum capacity the conveyor will be required to handle.
STANDARD U-TROUGH SCREW CONVEYOR Shaft Mounted Drive Screw with Full Pitch Flights Cover Std. Length G C/C Length Screw with Half-Pitch Flights Hanger (Used on Feeders) Bearing Support Foot Overall Length of Trough Tail End Bearing E D B H I sq. 15/8" D H I sq. F STANDARD SCREW CONVEYOR DIMENSIONS SCREW SIZE 4" 6" 9" 12" 14" 16" 18" 20" 24" A 5 .
The actual screw conveyor speed is calculated by dividing the Selection Capacity by the capacity at 1-rpm. 1873/31.2 = 60-rpm 60-rpm is the correct speed for a 16-inch diameter screw conveyor with cut and folded flights and short pitch for conveying and mixing 333 cubic feet per hour.
Conveyor loadings may sometime exceed the recommended % of Loading listed in the materials table. Considerations as to the material characteristics may justify up to 95% loading of tubular or shrouded conveyors.
The capacity of a screw conveyor is measured in cubic feet per hour. When calculating screw conveyor sizing manufacturers look at the desired flow rate the diameter of the screw (the part where the blades extend) the outside diameter of the center pipe the pitch of the screw (the distance between each blade on the screw) and the trough .
A 10-inch conveyor 35 feet long with a capacity of 10 tons per hour at 45 RPM has been selected. From the Materials Table a Horsepower Factor of 0.8 is found for the material to be conveyed. The table also indicates Series 4 hanger bearings and shafts.
A conveyor is required to transport 10 tons per hour of a material weighing 62 pounds per cubic foot and having a maximum particle size of 100 mesh. To further complicate the problem we will require that the material be mixed in transit using cut and folded flights.