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When the screw shaft rotates, due to material gravity and friction produced by the tank walls, make the item can only be on the blades push the Groove along the conveyor moves forward, it seems you can't rotate the nut down the rotation of the screw motion. Material bearing in the middle of migration, you are relying on the back along with the thrust of the material. So, the material in the conveyor transporting, it is entirely a sliding motion. In order to make the spiral axial tensile State is more favourable, generally driving device and a discharge port placed on the conveyor on the same side, as far as possible on the other side of the inlet near the tail. Rotating spiral screw conveying the material over, so that materials not rotating with the spiral conveyor leaf item weight is the force and friction of the screw conveyor casing material. Blade shapes according to conveying a different entity type, belt type, leaf surface patterns. Screw conveyor screw shaft material movement in the direction of end thrust bearing with axial force of the material to spiral, Captain long, intermediate hanger bearings should be added.