Many sand making machines in the market now have dual functions of sand making and shaping. They operate in two different modes: rock-on-rock and rock-on-iron. Generally, "rock-on-rock" is used for shaping, while "rock-on-iron" is used for sand making. So, what are the specific differences between these two modes?
There are two feeding methods for sand making machines: full central feeding and central feeding with waterfall feeding. Full central feeding is mainly used in the "rock-on-iron" mode, while central feeding with waterfall feeding is used in both "rock-on-rock" and "rock-on-iron" modes.
"Rock-on-rock":
The crushing method of "rock-on-rock" is suitable for materials with medium hardness and high corrosiveness, such as basalt. During the crushing process, the material does not collide with metal components but impacts the material lining, reducing wear on the sand making machine. Additionally, the crushed material has good particle shape, but it may contain a slightly higher amount of fines. Generally, "rock-on-rock" is suitable for material shaping.
"Rock-on-iron":
The crushing method of "rock-on-iron" is suitable for materials with moderate to low hardness and low corrosiveness, such as limestone. During the crushing process, the material directly collides and impacts with the counter block, resulting in high crushing efficiency. However, the equipment incurs higher wear costs, and the particle shape of the crushed material may be slightly inferior. Generally, "rock-on-iron" is suitable for sand making.
Recommended Equipment:
PLS series vertical impact crusher (shaping + sand making machine):
The PLS series vertical impact crusher offers both "rock-on-rock" and "rock-on-iron" crushing modes. With the installation of the counter plate, it operates in the "rock-on-iron" sand making mode, while without the counter plate, it functions in the "rock-on-rock" shaping mode. This equipment can achieve a high-speed mode of over 80 meters per second, suitable for the re-crushing and shaping of coarse sand particles in the sand and aggregate processing industry. It optimizes and adjusts the particle size distribution of the finished sand, allowing for a smaller fineness modulus.