Common troubleshooting for worm gear and screw elevators. Different products may have different structural types, so for screw elevators, they also have different product types. Now let's introduce their product types! For screw elevators, there can be two types of structures. For the first type of screw elevator, the screw is used for both rotation and axial movement. Another type is the screw as a rotating motion. The nuts on the screw are of the type that move axially; For the first type of screw elevator, each structural type also has a different type of assembly.