Widely used in various industries, such as building materials, chemical, electric power, metallurgy, coal charcoal, grain and other industries, suitable for horizontal or inclined conveying of powder, granular and small block materials, such as coal, ash, slag, cement, grain, etc. Material temperature is less than 200 ° C. The screw machine is not suitable for conveying perishable, viscous, agglomerated materials. In the concrete mixing station, the role of the shaftless screw conveyor has been greatly reflected.
The screw conveyor is a screw conveyor that transfers the material by rotating spiral blades so that the force of the material not rotating together with the screw conveyor blade is the weight of the material itself and the friction resistance of the screw conveyor casing to the material. The spiral blade welded on the rotating shaft of the screw conveyor, the surface shape of the blade has a solid surface type, a belt surface type, a blade surface type and the like according to different materials to be conveyed. The screw shaft of the screw conveyor has a thrust bearing at the end of the material moving direction to give the axial reaction force of the spiral with the material. When the length of the machine is long, the intermediate hanging bearing should be added.
According to its structural characteristics and performance, screw conveyors are commonly used for the transportation of materials during the production process of grain and oil and feed processing plants.
1. It is not suitable for conveying large pieces of fibrous materials with high abrasiveness, brittleness or easy to bond, so as to avoid blockage and material breakage.
2. According to the installation form, the screw conveyor can be divided into fixed and mobile.
3. According to the conveying direction or working speed, it can be divided into horizontal slow speed and vertical fast.
4. More commonly used in engineering practice are fixed and horizontal slow speed screw conveyors.