219 Tube Spiral Lifting Conveyor Chain Conveyor Tubular Conveyor, Screw conveyors are suitable for non-viscous dry powder materials and small granular materials.(For example: cement, fly ash, lime, grain, etc.) whileshaftless screw conveyorsare suitable for conveying viscous and easily entangledmaterials. Screw conveyors are divided into two types based on the conveying form: shaft screw conveyors and shaftless screw conveyors. In terms of appearance, they are classified intoU-type screw conveyors and tubular screw conveyors. Shafted materials. (For example: sludge, biomass, garbage, etc.) The working principle of a screw conveyor is that the rotating spiral blades push thematerialsforward for screw conveyor transportation. The force that prevents the materials from rotating with the screw conveyor blades is the weight of the materials themselves and the frictional resistance of the screw conveyor casing against the materials. The spiral blades welded onto the rotating shaft of the screw conveyor come in different surface types depending on the materials being conveyed, including solid surface type, belt surface type, and blade surface type. At the end of the material movement direction on the screw conveyor's spiral shaft, there is a thrust bearing to withstand the axial reaction force from the materials. When the machine length is long, intermediate hanging bearings should be added.

       From the perspective of material displacement direction, screw conveyors are divided into two main types: horizontal screw conveyors and vertical screw conveyors. Screw conveyors that use high-strength plastic for the conveying chain are also known as food screw conveyors or spiral elevators, mainly suitable for conveying large items such as cartons, turnover boxes, and bottled water. Depending on the characteristics of the materials being conveyed and the structural requirements, screw conveyors include horizontal screw conveyors, vertical screw conveyors, flexible screw conveyors, and spiral tube (roller conveyor) conveyors.219 Tube Spiral Lifting Conveyor Chain Conveyor Tubular Conveyor.