1. The principle of crushing and the quality of finished products
Granular advantage
Counter-breaking adopts the principle of impact crushing, which strikes the material through a high-speed rotating rotor, causing the material to shatter along the natural texture, and the finished product is mostly cube-shaped, with a needle-like content of less than 10%.However, the jaw is broken by extrusion, and the finished product has more edges and corners, and the proportion of needle flakes often reaches 15%-25%.
Gradation control
Jaw breaking can achieve multi-stage crushing by adjusting the gap between the counterattack plate and the rotor (usually 10-50mm), and the one-time forming rate can reach more than 80%; jaw breaking requires supporting screening equipment to achieve the same level of effect.
2. Production efficiency and economy
Comparison of processing power
At the same power (such as 132kW), the output of PF-1315 can reach 150-250 tons when the jaw is broken, while the output of PE-900×1200 when the jaw is broken is about 220-380 tons, but the latter needs to be used with a vibrating feeder (power is about 5.5kW).
Energy consumption performance
The power consumption of the counterattack is about 0.8-1.2 kWh/t per ton, and the counterattack is about 1.5-2kWh/t per ton.Based on the annual processing of 500,000 tons of production lines, the annual energy-saving cost exceeds 40,000 US dollars.
3. Differences in applicable working conditions
Humidity adaptability
Jawbreaker can handle materials with a moisture content of less than 8% (up to 12% with a heating device), and jawbreaker is recommended to be controlled within 6%.
Life of wear-resistant parts
The life span of the high-chromium cast iron plate hammer in granite crushing is about 30,000-60,000 tons, and the life span of the jaw plate is about 15,000-30,000 tons.However, it only takes 4-8 hours to replace the complete set of wear-resistant parts with a broken jaw, and 12-24 hours for a broken jaw to be overhauled.
4. Environmental protection and intelligence
The new type of jawbreaker is equipped with a pulse dust collector (dust removal efficiency ≥99.5%) and a noise mask (≤75dB), which is 5-8dB lower than jawbreaker.The intelligent control system can monitor the bearing temperature (warning value 85℃) and vibration value (alarm threshold 7.1mm/s) in real time.
Conclusion
PF impact crusher is particularly suitable for commercial mixing stations with strict requirements for the particle shape of finished products (the standard requires needle flake ≤15%) and machine sand production (MB value ≤1.4), and jaw breaking is still irreplaceable in the field of primary crushing.It is recommended to choose according to the characteristics of raw materials (such as compressive strength <350Mpa, preferably anti-breaking) and the investment budget.
