The buried scraper conveyer is a continuous conveying equipment for conveying the bulk material such as dust-like, small particles and block, and can be transported horizontally, obliquely and vertically.

Bulk material with internal friction and side pressure and other characteristics. Horizontal transport, the material by the scraper chain in the direction of the thrust force, when the material between the internal friction between the material and the groove wall of the external friction, the material with the scraper chain forward movement. The material flow is stable when the ratio between the height of the material layer and the width of the machine groove satisfies certain conditions.

Vertical transport, the main depend on the material with the arching characteristics. The material in the closed machine tank in the direction of the chain by the scraper in the direction of the thrust, and by the lower part of the feed and prevent the resistance of the upper material down, the lateral pressure, The internal friction is greater than the external friction between the material and the groove wall and the material weight, the material with the scraper chain to transport up to form a continuous stream. As the scraper chain in the movement of vibration, and some materials will sometimes be broken material arch, sometimes formed, so that the material in the transport process for the chain to produce a hysteresis, affecting the transmission capacity.

Second, the scope of application and selection principles

Buried scraper conveyor mainly by the closed section of the shell (machine slot), scraper chain, drive and tension devices and other components. Easy to install and maintain; multi-point feeding, multi-point discharge, process selection and layout is more flexible; in the delivery of flying, toxic, high temperature, flammable materials, when the explosion-proof materials, , Can improve working conditions and reduce environmental pollution. Buried scraper conveyor has been widely used in chemical, building materials, metallurgy, power, food, light industry and transportation departments.

Buried scraper conveyor on the materials have the following requirements:

(1) material bulk density: ρ = 0.2 ~ 2.5t / m3

(2) material temperature: general models applicable material temperature is less than 120 ℃; hot material type conveying material temperature is 100 ~ 450 ℃, instantaneous material temperature allowed to reach 800 ℃.

(3) Moisture content: Moisture content and the material of the material, viscosity, generally should be hand-pinch group after the hand can still loose for the degree.

(4) Material granularity: See Table 1-1.