When choosing buried scraper conveyor to transport materials, the following requirements are imposed on the materials:

(1) Material looseness: ρ=0.2-2.5t/m³.

(2) Material temperature: The applicable material temperature of the general model is less than 120℃; the temperature of the hot material conveying material is 100-450℃, and the instantaneous material temperature is allowed to reach 800℃.

(3) Moisture content: The moisture content is related to the particle size and viscosity of the material. Generally, it should be kneaded into a ball by hand and it can still be loose.

(4) Material particle size: suitable particle size<B/20, maximum particle size (≤10%)<B/10, (B is the effective width of the machine slot).

For materials with the following properties, buried scraper conveyors are generally not suitable:

(1) Materials with large suspension;

(2) Materials that are too large;

(3) Materials with high abrasiveness;

(4) Materials with excessive compressibility;

(5) Materials with high viscosity;

(6) Materials with strong liquidity;

(7) Materials that are fragile and do not want to be broken during transportation;

(8) Materials with hard characteristics;

(9) Corrosive materials should not be selected if there is no effective anti-corrosion measures.

The scraper types of general purpose buried scraper conveyors are T-type, U-type, V-type, O-type and B-type; in actual selection, different types of scraper should be selected for conveying different materials.

Figure 1 Scraper Type of Buried Scraper Conveyor

(1) For general materials with good conveying performance or small particle size, scraper types with simpler structures can be selected, such as T-type, V-type and O-type.

(2) For materials with high suspension and fluidity, in order to ensure that sufficient internal friction can be generated between the materials to overcome external resistance and self-weight, a scraper type with a more complex structure, such as U-shaped or O-shaped, should be selected.

(3) For materials with greater adhesion, a scraper type with a simpler structure should be selected to reduce the adhesion on the surface of the scraper and the difficulty of unloading and cleaning.

(4) When conveying denser materials and large slot width, in order to ensure the strength and rigidity of the scraper and prevent the scraper from deforming or breaking, the scraper type with diagonal bracing, such as type B, should be used.