Custom stainless steel screw conveyor with helical shaft and blades Suitable for inclined conveying of dry powdery or small granular materials, or free-flowing substances.

The screw of a screw conveyor, also known as the screw shaft, serves as the core and executive component of the entire equipment. It primarily consists of a central shaft, spiral blades welded onto the shaft, and end-connected shaft heads. Its core function is to generate axial thrust on materials through blade rotation, thereby achieving directed and metered material conveyance.

Screw design and selection are critical. First, blade configurations vary widely: common types include solid-face (suitable for dry powders and small particles), ribbon-type (ideal for sticky or easily entangled materials), and paddle-type (combining conveying and mixing functions). Second, the pitch (distance between adjacent blades) directly impacts conveying efficiency and filling rate. Standard pitch suits most applications, while short pitch is preferred for inclined conveyance or free-flowing materials.

Screw material selection depends on conveyed material properties, ranging from standard carbon steel to wear-resistant, corrosion-resistant stainless steel or surface-hardened options to meet abrasive, corrosive, or food/pharmaceutical-grade requirements. A well-designed screw must possess sufficient structural strength to withstand torque and material resistance. Simultaneously, its dynamic balance precision and the clearance between flights and barrel directly impact the overall machine's operational stability, energy consumption, and service life. Therefore, the precise design and manufacturing of the screw are critical factors determining the performance of the screw conveyor.