Types of screw blades

Left hand screw

Left hand screw, screw rotation clockwise, transport of material in the direction of the arrow indicating screw rotation.

Left hand screw, counterclockwise rotation of the screw, transport of material counter to the arrow indicating the screw rotation.

Right hand screw

Right hand screw, clockwise rotation of the screw, transport of the material counter to the direction of the arrow indicating the screw rotation.

Right hand screw, counterclockwise rotation of the screw, transport of material in the direction of the arrow indicating the screw rotation.

Types of screw blades

Standard versionStandard blades have a stroke equal to the blade diameter. They are used and suitable for most horizontal screw conveyors.	2/3D version with dense stroke. Screw blades with dense stroke are recommended for ascending transport or for materials with very free movement.	½D version with more dense stroke Screw blades with more dense stroke are recommended for ascending transport with inclination angle above 20 degree or vertical transport.
Blades with increasing pitchThey are used for evenly pulling out small free-flowing materials from the whole length of the feed inlet e.g. from silos or tanks.	Blades with tapering diameterUsed e.g. for draining materials in the process of wastewater transport.	Double-bladeThe double-blade version ensures a more even discharge of some loose materials.
Blades with cut-outs on the insidePerfectly suited for transporting materials with a tendency to stick between the blades and screw shaft.	Blades with cut outs on the outsideThe notched blades are used in processes where the transported material is gently mixed at the same time.

Which screw blades will ensure the best performance of the equipment?

The screw blades are used in many industries, being in some situations a key element in the transport of various bulk materials. We are aware of the fact that each device must be constructed according to specific needs, therefore we approach each order individually. The screw blades, or more precisely their shape, size and arrangement, have a decisive influence on the efficiency of the material transport, e.g. transport of aggregates. Each of these details has a direct impact on the life span, efficiency of the machine working process and increases machine durability.

Solid screw blades - the most commonly used blade type in screw feeders

For the handling of fine-grained and loose materials, solid screw blades are most commonly used. This is due to the space between the shaft and the outer edge of the roll, which is closed throughout its length. This design eliminates the possibility of small elements getting into unwanted places. We know from experience that this solution does not always work, so we have taken care to expand our offer with other types of screw blades.

Carefully thought-out and well-chosen screw blades

We support clients placing orders for screw blades at every stage of selection. It is very important that the shape and grade of steel chosen is suitable for the type of bulk material transported. Otherwise, the screw blades will wear out more quickly, which involves repair costs and even the need of downtime and purchase a new device.