The Sand Making Line of our company mainly includes Vibrating Feeder, Jaw Crusher, Cone Crusher (or Impact Crusher), Vertical Shaft Impact Crusher (Sand Maker), Vibrating Screen, Sand Washer, Belt Conveyor, Control System and so on. It can crush limestones, granite, basalt, river stones etc into sand for construction and building industry; capacity can be designed from 30 to 300TPH. 
Working Principle of sand making plant
Raw materials in big size go trough hopper, and are sent to jaw crusher evenly by vibrating feeder for primary crushing. The crushed materials are sent to cone crusher (or impact crusher) by belt conveyor for secondary crushing, and then the crushed materials are sent to vibrating screen by belt conveyor for screening. The final sand (the final products below the bottom sieve) is sent to sand washer to clean, and then to the final products pile. The bigger pieces stones (stones on the top sieve) will be sent to vertical impact crusher (sand maker) for fine crushing, and then to vibrating screen again for screening. This forms closed and continuously automatic cycles.
Features of sand making plant:
1.Easy in operation and convenient in usage.
2.High productivity and low investment. 
3.Good grain shape for end products.
4.The sand can be screened in to different grade and the size of sand can be adjustable.

http://cn-stonecrusher.com/products/Mobile-Crushing-Plant.html