At present, many projects at home and abroad applies the vertical shaft impact crusher as the main sand making machine, which has the advantages of high production efficiency, good sand particle shape, low operation cost, small amount of civil engineering and installation works. It also can reshape small and medium-sized stones.
The production process is “feeding–crushing–screening–returning (or warehousing)” no matter the crushing cavity is “stone striking stone” or “stone striking iron”.
Generally, when the raw material is hard to break rock and has strong abrasion resistance, the sand making machine with “stone striking iron” should be selected; when the raw material is medium or fragile rock and the abrasion is medium or weak, the sand making machine with “stone crushing iron” should be selected.
Advantages: high processing capacity, low noise and low energy consumption.
Disadvantages: sand fineness modulus and stone powder content and other parameters are not easy to adjust and control.
If dry production is adopted, and raw materials are fragile, stone powder content is generally high, fineness modulus is low, if the raw materials are medium or hard to be broken, the opposite is true; the grading of final products is unreasonable, there are many coarse particles, and it is necessary to form a closed-circuit circulation production with inspection and screening.