Choosing correctly
Standard Pitch
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In a standard pitch screw conveyor, the pitch is equal to the screw diameter. The screw diameter is the distance between the two flights. They are used in horizontal screw conveyors and inclined screw conveyors with typical degree of no more then 10°. They are suitable for handling most materials and offer an effective yet simple design.
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Variable Pitch
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In variable pitch screw conveyors, the pitches increase variably across the length of the screw. The pitch is longer at the infeed side to provide additional space for the fed materials as they are being discharged from hoppers, bins, or silos. Variable pitch screw conveyors are used in screw feeders for a controlled volumetric flow rate of materials.
Short Pitch
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In short pitch screw conveyors, the pitch is equivalent to two-thirds of the screw diameter. They are commonly used in inclined and vertical screw conveyors and in transporting free-flowing materials to prevent flushing.
Long Pitch
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In long-pitch screw conveyors, the pitch is equivalent to one and a half times the screw diameter. They are used for transporting liquids and other free-flowing materials and for rapid material conveying processes.