How Does Impact Crusher Work? The working principle of a counterattack crusher is primarily based on the use of impact energy to crush materials. During operation, when materials enter the area affected by the blow bars, they are first crushed by the impact of the blow bars. Then, they are forcibly thrown against the breaker plate and bounced back into the blow bar area for further crushing. This process repeats in cycles, with materials being crushed successively from larger to smaller sizes as