The development of screw conveyor machines can be divided into two types: shaft screw conveyors and shaftless screw conveyors. Shaft screw conveyors are composed of screws, U-shaped troughs, covers, inlet and outlet ports, and drive devices. They are generally available in three types: horizontal, inclined, and vertical. Shaftless screw conveyors use screws instead of shaftless screws, and are equipped with replaceable linings in the U-shaped troughs. They have a simple structure, and materials are input from the feed port and output from the outlet after being pushed by the screw. The entire transmission process can be carried out in a sealed trough. Generally speaking, the screw conveyors we usually refer to are shaft-type screw conveyors.
For many materials that are difficult to transport, people have been looking for a reliable method of transportation, and shaftless screw conveyors are a good solution. From the middle of the 17th century, aerial ropeways began to be used to transport bulk materials. In 1887, the screw conveyor was invented by Archimedes. Later, it was improved and widely used in industry to transport bulk and solid materials. After a long period of development, a series of screw conveyors were gradually developed, which made screw conveyors have a great development.
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