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BTMA--Analysis and research on the crushing mode of the crusher



Although the crusher is a practical machine, thinking about its crushing method is still very valuable. Based on years of working experience, the author summarizes as follows:

1. Crushing: The ore is placed between two crushing surfaces, and after pressure is applied, the ore is crushed due to the compressive stress reaching the limit of its compressive strength.

2. Splitting ballast: When squeezing the ore with a flat surface and a working surface with a sharp shuttle, the ore will split along the direction of the pressure line of action. The cause of splitting is due to the tensile stress on the splitting plane reaching or exceeding the tensile strength limit of the ore. The tensile strength limit of ore is much smaller than the compressive strength limit.

3. Fracture: The ore is damaged by bending. The crushed ore is a beam with two or more fulcrums bearing concentrated loads. When the bending stress in the ore reaches the bending strength limit of the ore, the ore is broken.

4. Grinding: After the pressure and shearing force between the ore and the moving surface, the shear stress reaches the limit of the shear strength of the ore, and the rock is crushed. The ground effect is low and the energy consumption is high.

5. Impact crushing: The ore is crushed by the impact force of the high-speed rotating machine. Its crushing force is instantaneous, and its crushing efficiency is higher than that of humans, and it can significantly reduce consumption.



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