How to choose the type of screw conveyor based on the conveyed material?

Method for selecting conveying materials for screw conveyor models

When selecting a screw conveyor model, factors such as material characteristics, conveying requirements, and working conditions should be comprehensively considered. Here are the specific steps and precautions:

Good sales, material characteristics

Material particle size: The material particle size determines the diameter of the small helix. For bulk materials, when the materials are not sorted, D≥(8～10)d， Where d is the average block size of the material (mm); When sorting materials, D ≥ (4-6) dK, which is a large block of material.

Material wear: Choose the appropriate filling factor based on the degree of material wear. ψ. Materials with almost no wear and tear (such as flour and grains) have a diameter of 0.45; Take out materials with small wear and tear (such as sand and cement) with a diameter of 0.33; Materials with significant wear and tear (such as slag) have a PSI of 0.15.

Material stickiness: The shaftless screw conveyor is suitable for materials with strong stickiness, as it can transport materials with strong stickiness, paste like stickiness, and easily entangled materials.

The second is the requirement for conveying capacity

Calculation of conveying capacity: Q=47D2nt πρ C (t/h) is used to calculate the conveying capacity, where D is the diameter of the screw (m), n is the speed of the screw shaft (r/min), t is the pitch (m), ρ is the loose density of the material (t/m3), ψ is the filling coefficient of the material, and C is the inclination coefficient (taken horizontally as C=1).

Thirdly, the working environment

Tilt angle: The tilt angle affects the speed and power of the conveyor. The larger the tilt angle, the higher the rotational speed, but the rotational speed should not be too high to prevent the material from being thrown outward due to excessive centrifugal force. The inclined (vertical) screw conveyor is suitable for short distance vertical conveying, with small conveying capacity, high speed, and high energy consumption.

Environmental temperature: The temperature may require special materials or insulation measures.

Limited space: The size and type of conveyor may be limited by the size and shape of the installation space.

Fourth, other factors

Maintenance and operation: Considering the difficulty and complexity of conveyor maintenance and operation, choose models that are easy to maintain and operate.