As a gravity type of double-conic reversing drum concrete mixer, the drum transmits by gear or friction wheel. The drum rotates clockwise during mixing and anti-clockwise during discharging. The mixer can mix plasticity and damp half-dry concrete. It is usually used on ordinary construction sites, roads, bridges projects and concrete prefabricated parts factories. This type of mixer is designed and manufactured according to GB/T9142-2000, <>. It has rational structure, and has the advantages of high production efficiency, excellent mixing quality, artistic outlook, light weight and convenience moving.