... .4. Cylinder tyre bolster: lower bolster has three types: fixed, zoom and floating. The structure is simple, replacement is ... building material equipment, and it can be divided into cement kiln, metallurgy chemical kiln and active lime kiln, porcelain ... 2) It is also used in various industries, such as cement, nonferrous metallurgy, ferrous metallurgy, chemistry, building, refractory material, ...