Compared with the traditional axial screw conveyor, the tubular shaftless screw conveyor adopts a non-central shaft design and utilizes an integral steel screw pushing material with a certain flexibility, thereby having the following outstanding advantages: strong resistance to winding. Without central axis interference, it has special advantages for conveyor belts and easy-wound materials. To highlight the use of fully enclosed conveyors and easy-to-clean spiral surfaces, environmental hygiene and delivered materials are protected from contamination and leakage. Large torque and low energy consumption. Because the screw has no shaft, the material is not easy to be blocked and the discharge port is not blocked, so it can run at a lower speed, transmit the power smoothly, and reduce energy consumption. Delivery volume /