Screw

A screw can be considered a device or machine for transporting materials at different distances and angles, and is actually classified as one of the devices in the material transport system. This device consists of a body and a spiral or auger, which is generally made of metal, and the mineral material inside it is oscillating and moving upwards. Among the advantages of using this material transport device at all desired angles, the absence of dust, reduced energy consumption, and minimal need for maintenance and repair can be mentioned. This device, which is also known as a material transport spiral or auger, is widely used in mineral processing plants, pharmaceutical and chemical materials, food, etc. to transport materials to the next device. It is generally designed and manufactured in two models: full tubular and U-shaped. This device is capable of transporting a wide range of relatively high-density materials. The reason is the spiral nature of this device, where the screw is fixed on a central shaft and rotates on its body, and the materials are compressed along the bottom and sides of the belt and oscillate in the remaining empty space between the spirals.
This movement will cause the material particles to slide over each other and make forward movement easier. Screw conveyors are usually located horizontally or at a slight slope and are most effective in industries that are in bulk.
The design and construction of this structure changes according to the amount of daily work, the weight and volume of the transported load, the type of material, the location and distance of other devices, the environmental weather conditions, etc. This device can be either prefabricated and designed in advance or after construction after reviewing the area.

The screw machine is produced in two models: tubular and U-shaped, in different lengths and diameters. This conveyor is usually used to transport minerals under 10 mm and its maximum inclination is 45 degrees to the horizontal surface. The steel type of spirals produced by Mumtaz Sandzhaneh Company are widely used in transporting food and pharmaceutical materials.

Other types of material handling and grading equipment include sieves, feeders, cyclones, separators, conveyors, and elevators.