Shaftless screw conveyor, also known as the centerless screw conveyor, is a type of screw conveyor that differs from the traditional screw conveyor in that it does not have a central shaft. Instead, the screw is supported by a liner or a trough, which allows it to rotate freely.

Shaftless screw conveyors are commonly used for the transportation of viscous and abrasive materials, as well as for materials that tend to wrap around a central shaft. The absence of a central shaft eliminates the possibility of material build-up and clogging, which can be a common problem in traditional screw conveyors.

The design of a shaftless screw conveyor typically includes a helical screw blade, a trough or liner, and a drive unit. The screw blade is made of a continuous, flexible material, such as steel or plastic, and is designed to move the material along the length of the conveyor. The trough or liner is typically made of steel or lined with a wear-resistant material, such as ceramic or rubber, and is designed to support the screw blade and contain the material being transported. The drive unit is typically located at the discharge end of the conveyor and is used to rotate the screw blade.

Shaftless screw conveyors are used in a variety of industries, including wastewater treatment, pulp and paper, chemical processing, and mining. They are particularly useful for handling materials that are difficult to convey using traditional screw conveyors, such as sludge, screenings, and other types of waste materials.

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