KWS Manufacturing

Shaftless Screw Conveyor Design Standards

KWS Shaftless Screw Conveyors are designed to handle almost any bulk material, from dry and free-flowing to sticky and sluggish. Shaftless screw conveyors are ideal for bulk materials with high moisture content that have a tendency to adhere to the center pipe of a conventional shafted screw conveyor.

KWS Shaftless Screw Conveyor Design Standards

This problem is totally eliminated because there is no center pipe on a shaftless screw conveyor. Only the shaftless spiral is used to convey the bulk material.

After performance requirements and product characteristics are known, KWS begins a systematic design process by applying proprietary calculations to determine conveyor size, rotational speed and horsepower to deliver the desired capacity. Due to the stresses associated with conveying sluggish and often abrasive bulk materials, high performance, heavy-duty materials of construction are integrated into a KWS Shaftless Screw Conveyor system.

Since there is no center pipe to transmit torque, the shaftless spiral is designed to handle the full-motor torque load of the drive unit. Additionally, since the shaftless spiral has no center pipe for support, replaceable trough-conforming liners are used to evenly support the entire length of the rotating spiral.

SHAFTLESS SCREW
CONVEYOR SIZES
SPIRAL OUTER
DIAMETER
DRIVE SHAFT
DIAMETER
OUTER SPIRAL
FLAT BAR
INNER SPIRAL FLAT BAR
(IF REQUIRED)
DISK
THICKNESS
LINER
THICKNESS
RECOMMENDED
TROUGH THICKNESS
6" 5 1/2" 2" 5/8" THK. X 1 1/2" WIDE N/A 1" 3/8" 14 GA.
9" 8 1/2" 2 7/16" 3/4" THK. X 3" WIDE N/A 1" 3/8" 10 GA.
10" 9 1/2" 2 7/16" 3/4" THK. X 3" WIDE N/A 1" 3/8" 10 GA. OR 3/16"
12" 11 1/2" 3" 1" THK. X 3" WIDE 1/2" THK. X 2" WIDE 1" 1/2" 3/16"
14" 13 1/2" 3 7/16" 1" THK. X 3" WIDE 1/2" THK. X 2" WIDE 1" 1/2" 3/16"
16" 15 1/2" 3 7/16" 1" THK. X 4" WIDE 1/2" THK. X 2" WIDE 1" 1/2" 3/16"
18" 17 1/2" 3 15/16" 1" THK. X 4" WIDE 3/4" THK. X 3" WIDE 1" 1/2" 3/16"
20" 19 1/2" 3 15/16" 1" THK. X 4" WIDE 3/4" THK. X 3" WIDE 1" 1/2" 3/16"
24" 23 1/2" 4 7/16" 1" THK. X 4" WIDE 3/4" THK. X 3" WIDE 1" 1/2" 3/16"