The aircraft used for labor, metallurgy, machinery, light industry, food, transportation and other sectors like transport of dust, small particles and small bulk material loading. Models: Universal, hot material type, soda special type (ordinary type, high efficiency type), special type of grain, cement special type, plant-specific type, etc., have width 120-1000mm. First, the transport principle and characteristics: buried scraper conveyor is transporting dust-like, continuous bulk handling equipment and other small particles and bulk materials can be horizontal, inclined and vertical transport. Bulk material with internal friction and lateral pressure and other characteristics. When the horizontal conveyor, the material by the scraper chain in the direction of movement of the thrust, when the internal friction of the material layer is greater than the friction material and the outer walls of the groove, the material is moved forward with the scraper chain. When the ratio of the material layer height and width of the slot machine to meet certain conditions, material flow stability. Vertical transportation, mainly dependent special material properties has played for. When closed slot machine materials by the scraper chain in the thrust in the direction of movement, and by continuously feeding the lower and the upper part of the material to prevent the decline of the resistance, resulting in pressure on the lateral side, thereby increasing the internal friction of the material, when the material between internal friction materials and tank vehicle is greater than the outer walls when the friction and material weight, when the material inside the arch material will sometimes be destroyed between materials, sometimes forming, thus making the material in the course of transmission for the chain to produce a hysteresis impact of transport capacity. Buried scraper conveyor consists of a closed section of the casing (slot machines), scraper chain, drive and tensioning devices and other components. Equipment is simple structure, small size, good sealing performance, installation and maintenance more convenient; can do more to feed, multi-point discharge, process selection and arrangement is more flexible; flying in material handling, poisonous, high temperature, explosive, it can improve working conditions and reduce environmental pollution. Buried conveyor has been widely used in chemical, building materials, metallurgy, electric power, food, light industry and transport sectors.