METHOD AND APPARATUS FOR MANUFACTURING CRUSHED SAND

摘要

PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing crushed sand for concrete or the like by which the crushed sand corresponding to a dam aggregate standard can be manufactured by keeping the apparatus under control according to the particle size of the manufactured crushed sand while grasping the particle size distribution precisely. SOLUTION: The crushed sand having the prescribed coarse particle rate (FM value) is manufacture in a sand manufacturing factory by controlling a raw material storing means 1, a raw material supplying means 2 or a crushing means 3 for crushing the mined ore so that the particle size distribution or particle weight distribution of the crushed sand stands within the predetermined allowable range. The particle size and the particle size distribution or particle weight distribution are obtained by imaging the whole or part of the crushed sand discharged from the means 3 by an optical means 5 to obtain image information and measuring the projected area of each of the sand particles on the basis of the image information by using an image analyzing means incorporated in a central processing unit 6 and performing calculations by using the measured projected area.